Hesitation
Question:
Any chance it’s the transmission shudderring in and out of lock-up? Try it in second gear. If it was fuel related it would do it in every gear at a set speed. GW – Hide quoted text — Show quoted text – > Car:1994 Oldsmobile Cutlass Supreme 3.1 engine > I have changed plugs and wires and still at 45 to 50 mph the car sometimes > wants to hesitate. Could it be 1 or all the fuel injectors? > Thanks, Chuggy
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Car:1994 Oldsmobile Cutlass Supreme 3.1 engine I have changed plugs and wires and still at 45 to 50 mph the car sometimes wants to hesitate. Could it be 1 or all the fuel injectors? Thanks, Chuggy
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My 91 Explorer 4L hesitates when I step on the gas pedal. RPM drops from approx 1000 to about 500 and then accelerates. It will do this in Nutral as well as drive, stopped or going. Hot or cold does not make a difference. It runs well on the highway. I have replaced the Fuel Pump relay recently. ( No difference ) I would appreciate any clues you may have to offer. Thanks Kevin
Response:
A couple of questions 
*How’s the air filter? *Replaced the fuel filter lately? *How’s the fuel pressure? *Noticed any decrease in mileage? *Has this been a gradual problem getting worse with time, or did it start all at once? *How long has this been going on? *Did this occur after any work was done on the vehicle, or anything in peculiar like flooring it to pass another vehicle? *How many miles are on the vehicle? *Although an unlikely cause, what do the plugs look like(heads and intake are prone to leaking..happened on my 91 EB)? Answering these questions will help everyone here give you some information. Good luck! Wesley Murphy
– Hide quoted text — Show quoted text -> My 91 Explorer 4L hesitates when I step on the gas pedal. > RPM drops from approx 1000 to about 500 and then accelerates. > It will do this in Nutral as well as drive, stopped or going. > Hot or cold does not make a difference. > It runs well on the highway. > I have replaced the Fuel Pump relay recently. ( No difference ) > I would appreciate any clues you may have to offer. > Thanks > Kevin
Response:
Sounds like the ignition control module or possibly,the ECU.Chilton and Haines,both do a manual on codes.Then you can access the computer code with a tool available most places for around $10,that links the correct terminals in the fuse box. The code will appear on your radio facia and from there,you will see what the problem is.
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Wayne, Have you checked fuel pressure during the hesitation? Had a similar a similar problem, it was the pickup coil. Also check the distributor for a good ground. Martin
– Hide quoted text — Show quoted text -> The cap, rotor, and plugs have all been replaced, as well as the ignition > coil and the pickup coil. The alernator was also replaced and is not leaking > any AC voltage as was the old one. > What about cap, rotor, and plugs? Any of them in bad condition could cause > a > hesitation.
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What about cap, rotor, and plugs? Any of them in bad condition could cause a hesitation.
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The cap, rotor, and plugs have all been replaced, as well as the ignition coil and the pickup coil. The alernator was also replaced and is not leaking any AC voltage as was the old one.
– Hide quoted text — Show quoted text -> What about cap, rotor, and plugs? Any of them in bad condition could cause a > hesitation.
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When I replaced the Throttle Body with a new one it came with a new throttle position switch. I have also checked it with a ohm meter and it works fine, as well as the map sensor.
– Hide quoted text — Show quoted text -> Throttle position sensor
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I have a 1989 GMC Jimmy T-15 4.3 V-6 TBI, EST, Auto. The truck run’s and start’s good . The problem is when I step on the gas hard it hesitates then go’s.If you step on it lightly it’s ok,no hesitation. No computer codes, good vacum,good fuel pressure, new throttle body.
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Throttle position sensor
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By the way, the lean mix code comes from multiple O2 sensors, plus B1S1, B1S2 and B2S1 are new (blown head gasket casaulties). — 98 Camaro Phreego – Cheap Internet Access <http://www.phreego.com>
– Hide quoted text — Show quoted text -> My 96 S10 Blazer has developed a nasty hesitation from a complete stop. At > all other speeds, if to punch the gas it does not hesitate at all. The fuel > filter is new, the injectors are new and the fuel pressure is spec. > Occasionally, it will throw a lean mix code that geos away after a couple of > minutes, usually only when towing or low outside temps (like 25 degrees and > below). I plan on changing the IAT, but it seems something else is going > on. Just looking for your thoughts. Thanks! > — > 98 Camaro > Phreego – Cheap Internet Access > <http://www.phreego.com>
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My old 90 K1500 with the 350 did that. Drove me crazy until one of the guys on this news group told me to change the EGR. Bingo, as usual they were right. My hat is off to a great bunch of Gentlemen who are more than willing to help. My last problem was a slight hesitation when the torque converter was locked up and the engine was under light acceleration. They hit spark plug wires right on the nose. — Thanks Denny
– Hide quoted text — Show quoted text -> By the way, the lean mix code comes from multiple O2 sensors, plus B1S1, > B1S2 and B2S1 are new (blown head gasket casaulties). > — > 98 Camaro > Phreego – Cheap Internet Access > <http://www.phreego.com> > My 96 S10 Blazer has developed a nasty hesitation from a complete stop. > At > all other speeds, if to punch the gas it does not hesitate at all. The > fuel > filter is new, the injectors are new and the fuel pressure is spec. > Occasionally, it will throw a lean mix code that geos away after a couple > of > minutes, usually only when towing or low outside temps (like 25 degrees > and > below). I plan on changing the IAT, but it seems something else is going > on. Just looking for your thoughts. Thanks! > — > 98 Camaro > Phreego – Cheap Internet Access > <http://www.phreego.com>
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Re: Hesitation My old 90 K1500 with the 350 did that. Drove me crazy until one of the guys on this news group told me to change the EGR. Bingo, as usual they were right. My hat is off to a great bunch of Gentlemen who are more than willing to help. My last problem was a slight hesitation when the torque converter was locked up and the engine was under light acceleration. They hit spark plug wires right on the nose. — Thanks Denny
By the way, the lean mix code comes from multiple O2 sensors, plus B1S1, B1S2 and B2S1 are new (blown head gasket casaulties). — 98 Camaro Phreego – Cheap Internet Access <http://www.phreego.com>
My 96 S10 Blazer has developed a nasty hesitation from a complete stop. At all other speeds, if to punch the gas it does not hesitate at all. The fuel filter is new, the injectors are new and the fuel pressure is spec. Occasionally, it will throw a lean mix code that geos away after a couple of minutes, usually only when towing or low outside temps (like 25 degrees and below). I plan on changing the IAT, but it seems something else is going on. Just looking for your thoughts. Thanks! — 98 Camaro Phreego – Cheap Internet Access <http://www.phreego.com> @@@@@ I would have to agree with checking and cleaning the EGR to get any carbon deposits off. I would also suggest using starter fluid or a portable butane torch to check for vacume leaks around the intake and all parts attached to it. My preference is the butane torch, innexpensive and less likely to cause flame up on a hot engine. hope it helped Joseph Big 10 Tire and Auto
Response:
> By the way, the lean mix code comes from multiple O2 sensors, plus B1S1, > B1S2 and B2S1 are new (blown head gasket casaulties). > — > 98 Camaro > Phreego – Cheap Internet Access > <http://www.phreego.com>
Camaro, EGR valve pintle stuck open with crud or solenoid is stuck open. Whatever it is, it’s EGR related. Doc – Hide quoted text — Show quoted text -> My 96 S10 Blazer has developed a nasty hesitation from a complete stop. > At > all other speeds, if to punch the gas it does not hesitate at all. The > fuel > filter is new, the injectors are new and the fuel pressure is spec. > Occasionally, it will throw a lean mix code that geos away after a couple > of > minutes, usually only when towing or low outside temps (like 25 degrees > and > below). I plan on changing the IAT, but it seems something else is going > on. Just looking for your thoughts. Thanks! > — > 98 Camaro > Phreego – Cheap Internet Access > <http://www.phreego.com>
Response:
My 96 S10 Blazer has developed a nasty hesitation from a complete stop. At all other speeds, if to punch the gas it does not hesitate at all. The fuel filter is new, the injectors are new and the fuel pressure is spec. Occasionally, it will throw a lean mix code that geos away after a couple of minutes, usually only when towing or low outside temps (like 25 degrees and below). I plan on changing the IAT, but it seems something else is going on. Just looking for your thoughts. Thanks! — 98 Camaro Phreego – Cheap Internet Access <http://www.phreego.com>
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Here’s a new question My 98 Jimmy 4×4 AT 4.3 sometimes hesitates at 70mph. It has 105,000 miles. I had the plugs changed and a new fuel filter installed. It still does it. It does not set any codes. Any ideas????? Could it be a problem in the transmission?? I have 2,000 miles left on an after market warranty plan and would like to get this diagnosed and fixed soon.
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And yes the trans fluid was just changed
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It sounds like it could be either dirty or faulty fuel injectors. Most GM dealers can pressure clean the injectors while in the motor. I have this done about ever 40,000 miles and it always runs better when I leave the dealership. Brian – Hide quoted text — Show quoted text -> Here’s a new question > My 98 Jimmy 4×4 AT 4.3 sometimes hesitates at 70mph. > It has 105,000 miles. > I had the plugs changed and a new fuel filter installed. > It still does it. It does not set any codes. > Any ideas????? > Could it be a problem in the transmission?? > I have 2,000 miles left on an after market warranty plan and would like to > get this diagnosed and fixed soon.
Response:
Where the wires changed with the plugs?
– Hide quoted text — Show quoted text -> It sounds like it could be either dirty or faulty fuel injectors. Most GM > dealers can pressure clean the injectors while in the motor. I have this > done about ever 40,000 miles and it always runs better when I leave the > dealership. > Brian > Here’s a new question > My 98 Jimmy 4×4 AT 4.3 sometimes hesitates at 70mph. > It has 105,000 miles. > I had the plugs changed and a new fuel filter installed. > It still does it. It does not set any codes. > Any ideas????? > Could it be a problem in the transmission?? > I have 2,000 miles left on an after market warranty plan and would like to > get this diagnosed and fixed soon.
Response:
> Here’s a new question > My 98 Jimmy 4×4 AT 4.3 sometimes hesitates at 70mph. > It has 105,000 miles. > I had the plugs changed and a new fuel filter installed. > It still does it. It does not set any codes. > Any ideas????? > Could it be a problem in the transmission??
Sounds kinda like what my truck does except mine does it everytime is needs to downshift. Adair
Response:
NO – THE WIRES WERE NOT CHANGED
– Hide quoted text — Show quoted text -> Where the wires changed with the plugs? > It sounds like it could be either dirty or faulty fuel injectors. Most GM > dealers can pressure clean the injectors while in the motor. I have this > done about ever 40,000 miles and it always runs better when I leave the > dealership. > Brian > > Here’s a new question > > My 98 Jimmy 4×4 AT 4.3 sometimes hesitates at 70mph. > > It has 105,000 miles. > > I had the plugs changed and a new fuel filter installed. > > It still does it. It does not set any codes. > > Any ideas????? > > Could it be a problem in the transmission?? > > I have 2,000 miles left on an after market warranty plan and would like > to > > get this diagnosed and fixed soon.
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Take it in on the warrantee plan before it’s too late! They may not know the answer but that’s their problem – make them figure it out. Elliott – Hide quoted text — Show quoted text – > Here’s a new question > My 98 Jimmy 4×4 AT 4.3 sometimes hesitates at 70mph. > It has 105,000 miles. > I had the plugs changed and a new fuel filter installed. > It still does it. It does not set any codes. > Any ideas????? > Could it be a problem in the transmission?? > I have 2,000 miles left on an after market warranty plan and would like to > get this diagnosed and fixed soon.
Response:
Check for any vacuum leaks, esp at the fuel distributor/intake manifold boot. Move the boot around a little when the engine is running and listen for changes in the engine speed or hissing noise. later, dave BTW if you need help you should leave your correct address
– Hide quoted text — Show quoted text -> I have a severe hesitation with my Audi 80 4cyl. When starting > in 1st gear, there is a huge hesitation, but when shifting > through the gears at a higher RPM, it’s okay. It also has a > rough idle like it wants to stall when coming to a stop. I > adjusted the timing, but it is still there. Also, several times > when shifting through the gears throttled wide open, it bucks > like it is not getting enough fuel? When checking the faults > codes, I get a 2113 but I don’t know what that is. Can anybody > offer any suggestions? > Got questions? Get answers over the phone at Keen.com. > Up to 100 minutes free! > http://www.keen.com
Response:
My 1985 4000Q behaved the same way when the O2 sensor got wet…until I replaced it. Vacuum leaks can do similar things. Gene – Hide quoted text — Show quoted text – >I have a severe hesitation with my Audi 80 4cyl. When starting >in 1st gear, there is a huge hesitation, but when shifting >through the gears at a higher RPM, it’s okay. It also has a >rough idle like it wants to stall when coming to a stop. I >adjusted the timing, but it is still there. Also, several times >when shifting through the gears throttled wide open, it bucks >like it is not getting enough fuel? When checking the faults >codes, I get a 2113 but I don’t know what that is. Can anybody >offer any suggestions? >Got questions? Get answers over the phone at Keen.com. >Up to 100 minutes free! >http://www.keen.com
Response:
A really superior way to find any sort of air leaks (either vacuum or pressure – like an exhaust leak) is with a stethescope. Replace the flat sensor (the cold part the doc always presses up to your warm skin) with a short length of small diameter hollow tubing. You can pinpoint leaks to within a cm or so with this device. Just move the tubing along the area you wish to check and listen for the sudden increase in sound. It’s a valuable tool for the home mechanic. — John Davies Monroe WA USA
– Hide quoted text — Show quoted text -> Check for any vacuum leaks, esp at the fuel distributor/intake manifold > boot. Move the boot around a little when the engine is running and listen > for changes in the engine speed or hissing noise.
Response:
I have a severe hesitation with my Audi 80 4cyl. When starting in 1st gear, there is a huge hesitation, but when shifting through the gears at a higher RPM, it’s okay. It also has a rough idle like it wants to stall when coming to a stop. I adjusted the timing, but it is still there. Also, several times when shifting through the gears throttled wide open, it bucks like it is not getting enough fuel? When checking the faults codes, I get a 2113 but I don’t know what that is. Can anybody offer any suggestions? Got questions? Get answers over the phone at Keen.com. Up to 100 minutes free! http://www.keen.com
Response:
Need a valve job? Some mechanics can tell just but listening to the exhaust at idle. When I’ve needed a valve job the low end suffered the most, but there are a lot of other things on this car that could be the problem, like plug wires (or plugs for that matter).
– Hide quoted text — Show quoted text -> I have a severe hesitation with my Audi 80 4cyl. When starting > in 1st gear, there is a huge hesitation, but when shifting > through the gears at a higher RPM, it’s okay. It also has a > rough idle like it wants to stall when coming to a stop. I > adjusted the timing, but it is still there. Also, several times > when shifting through the gears throttled wide open, it bucks > like it is not getting enough fuel? When checking the faults > codes, I get a 2113 but I don’t know what that is. Can anybody > offer any suggestions? > Got questions? Get answers over the phone at Keen.com. > Up to 100 minutes free! > http://www.keen.com
Response:
Last winter I noticed an absence of power in my 88 civic hatchback when I tried to accelerate. I only noticed it in 3rd gear. It is still happening this winter, but also in the last few days it has started hesitating when I am starting after a full stop. Generally I have to step on the accelerator more than usual and slip the clutch while keeping the revs up, or it will cut off. It doesn’t happen right away after starting the car, but happens after I have been driving around town for a while and have done a few errands where I have cut off the car and gone in the store, &c for a few minutes and come back out.
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>Last winter I noticed an absence of power in my 88 civic hatchback when I >tried to accelerate. I only noticed it in 3rd gear. It is still happening >this winter, but also in the last few days it has started hesitating when I >am starting after a full stop. Generally I have to step on the accelerator >more than usual and slip the clutch while keeping the revs up, or it will >cut off. It doesn’t happen right away after starting the car, but happens >after I have been driving around town for a while and have done a few >errands where I have cut off the car and gone in the store, &c for a few >minutes and come back out.
It could be the oxygen sensor. It gets slower as it ages. Eventually it becomes so slow that the engine’s emissions computer needs a few seconds to adjust the fuel mixture every time you change throttle.
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Try changing your sparkplugs….i had the same symptoms u had. i changed the spark plugs and my car ran normal.
– Hide quoted text — Show quoted text -> Last winter I noticed an absence of power in my 88 civic hatchback when I > tried to accelerate. I only noticed it in 3rd gear. It is still happening > this winter, but also in the last few days it has started hesitating when I > am starting after a full stop. Generally I have to step on the accelerator > more than usual and slip the clutch while keeping the revs up, or it will > cut off. It doesn’t happen right away after starting the car, but happens > after I have been driving around town for a while and have done a few > errands where I have cut off the car and gone in the store, &c for a few > minutes and come back out.
Response:
Last winter I noticed an absence of power in my 88 civic hatchback when I tried to accelerate. I only noticed it in 3rd gear. It is still happening this winter, but also in the last few days it has started hesitating when I am starting after a full stop. Generally I have to step on the accelerator more than usual and slip the clutch while keeping the revs up, or it will cut off. It doesn’t happen right away after starting the car, but happens after I have been driving around town for a while and have done a few errands where I have cut off the car and gone in the store, &c for a few minutes and come back out.
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>Last winter I noticed an absence of power in my 88 civic hatchback when I >tried to accelerate. I only noticed it in 3rd gear. It is still happening >this winter, but also in the last few days it has started hesitating when I >am starting after a full stop. Generally I have to step on the accelerator >more than usual and slip the clutch while keeping the revs up, or it will >cut off. It doesn’t happen right away after starting the car, but happens >after I have been driving around town for a while and have done a few >errands where I have cut off the car and gone in the store, &c for a few >minutes and come back out.
It could be the oxygen sensor. It gets slower as it ages. Eventually it becomes so slow that the engine’s emissions computer needs a few seconds to adjust the fuel mixture every time you change throttle.
Response:
Try changing your sparkplugs….i had the same symptoms u had. i changed the spark plugs and my car ran normal.
– Hide quoted text — Show quoted text -> Last winter I noticed an absence of power in my 88 civic hatchback when I > tried to accelerate. I only noticed it in 3rd gear. It is still happening > this winter, but also in the last few days it has started hesitating when I > am starting after a full stop. Generally I have to step on the accelerator > more than usual and slip the clutch while keeping the revs up, or it will > cut off. It doesn’t happen right away after starting the car, but happens > after I have been driving around town for a while and have done a few > errands where I have cut off the car and gone in the store, &c for a few > minutes and come back out.
