G.M. tech. ANY QUESTIONS YOU NEED ANSWERS TOO.
Question:
Hi Robert , Removed the module , Bought another <!00 bucks> installed it- still the same problem – runs great for about 5-10 mins. then wham ! shuts down Whatever happened to the 60’s cars man in his infinite wisdom to improve something just makes things more complicated
– Hide quoted text — Show quoted text ->Even though the ignition module tested fine on the bench, it can still be >bad, because it may only be acting up as the module heats up. I’d bet money >that if you immediately removed the ignition module when it stalled out and >checked it, it would test bad. >–
Response:
Have you checked for spark when it’s doing this? If it’s still no-spark when this problem occurs, then it’s possible the crankshaft sensor hooked up to the module is bad. It tells the module where the crankshaft is so it knows when to spark, so if its signal is screwed the spark will be too. Otherwise, it looks like it could be a fuel problem – fuel filter, bad fuel pump.. — Robert Hancock Saskatoon, SK, Canada Home Page: http://www.geocities.com/TimesSquare/Arcade/9967/ – Hide quoted text — Show quoted text – >Hi Robert , Removed the module , Bought another <!00 bucks> >installed it- still the same problem – runs great for about 5-10 mins. >then wham ! shuts down >Whatever happened to the 60’s cars >man in his infinite wisdom to improve something just makes things more >complicated >Even though the ignition module tested fine on the bench, it can still be >bad, because it may only be acting up as the module heats up. I’d bet money >that if you immediately removed the ignition module when it stalled out and >checked it, it would test bad. >–
Response:
Robert, Yes, the tech 2 does give an indication of engine torque. However, this said, it is only for those applications that use specific transmission software algorithms. As I stated in an earlier response, the torque displayed on the tech 2, in the trans info area, is based on al model of torque. It’s not a measured parameter, it is a modeled parameter. The value of torque is based on airflow. From a truck standpoint, only M.Y. 1998 and 1999 have this feature; not sure on cars, maybe 1996 and newer, though it still depends on the SW and trans HW, i.e. not the 3T40 or 4T60-E. Hope this helps. TD – Hide quoted text — Show quoted text ->OK here goes…does the GM Tech 2 scan tool on a 97 OBDII display the >correct readout on engine torque from the transmission data? And just >what/where is the torque reading coming from? >Thanks, >Lee >>Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need
mechanical help let me – Hide quoted text — Show quoted text ->>know I may be able to help you. > no the tech 2 don’t read torque reading.
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Lee, Sorry, I apparently wasn’t paying total attention to your first post. As I said before, this feature is required for proper transmission operation, but timing is everything. It was implemented in different products in different model years. For trucks it was introduced in 1998. Could this be the issue? TD – Hide quoted text — Show quoted text ->OK, sounds good but why does my stock Yukon show peak torque of 194lbs >when factory specs show 330lbs? And my Blown Yukon shows only 402lbs >at 4000 rpm? As you can see the Tech 2 shows more than a 50% increase >over my stock truck but the numbers are pretty much meaningless (if I >running 12lbs boost. The truck weighs just under 5900 lbs with me in >it. Qtr Mile Jr. software says that I must have 379 net HP in order to >do that. If you take 402 * 4000 / 5252 that only shows 306 HP or 73 HP >short of achieving the required HP. So I believe that the Tech 2 >torque readings are completely false! >Any other ideas? >Lee >I can answer that one……. >It is, or should be, reasonably close to a correct value. It is a parameter >based on an engine "torque model", not a value based on any type of >transducers…. >GM engineers spend "a whole lot" of time trying to perfect the torque model, >so it should be reasonably close. The torque model data is used by various >systems in the vehicle, primarily the transmission. The transmission >controls adjust line pressure during steady state operation or shifting >events in relationship to the amount of torque predicted. Traction control >systems also use data from the torque model. >Hope this helps… >TD >>OK here goes…does the GM Tech 2 scan tool on a 97 OBDII display the >>correct readout on engine torque from the transmission data? And just >>what/where is the torque reading coming from? >>Thanks, >>Lee >>>Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need >mechanical help let me >>>know I may be able to help you.
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Did check and yes absolutly No spark … How hard is it to replace the crankshaft sensor ? are there any circut breakers controlling this stuff ? Thank God I have an old 78 Pickup or I’d be stranded in the woods !!
– Hide quoted text — Show quoted text ->Have you checked for spark when it’s doing this? If it’s still no-spark when >this problem occurs, then it’s possible the crankshaft sensor hooked up to >the module is bad. It tells the module where the crankshaft is so it knows >when to spark, so if its signal is screwed the spark will be too. Otherwise, >it looks like it could be a fuel problem – fuel filter, bad fuel pump.. >– >Robert Hancock Saskatoon, SK, Canada >Home Page: http://www.geocities.com/TimesSquare/Arcade/9967/ >Hi Robert , Removed the module , Bought another <!00 bucks> >installed it- still the same problem – runs great for about 5-10 mins. >then wham ! shuts down >Whatever happened to the 60’s cars >man in his infinite wisdom to improve something just makes things more >complicated >>Even though the ignition module tested fine on the bench, it can still be >>bad, because it may only be acting up as the module heats up. I’d bet >money >>that if you immediately removed the ignition module when it stalled out >and >>checked it, it would test bad. >>–
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If the Tech 2 doesn’t read torque then why is it on the menu of the scan tool? – Hide quoted text — Show quoted text ->OK here goes…does the GM Tech 2 scan tool on a 97 OBDII display the >correct readout on engine torque from the transmission data? And just >what/where is the torque reading coming from? >Thanks, >Lee >>Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need mechanical help let me >>know I may be able to help you. > no the tech 2 don’t read torque reading.
Response:
I can answer that one……. It is, or should be, reasonably close to a correct value. It is a parameter based on an engine "torque model", not a value based on any type of transducers…. GM engineers spend "a whole lot" of time trying to perfect the torque model, so it should be reasonably close. The torque model data is used by various systems in the vehicle, primarily the transmission. The transmission controls adjust line pressure during steady state operation or shifting events in relationship to the amount of torque predicted. Traction control systems also use data from the torque model. Hope this helps… TD >OK here goes…does the GM Tech 2 scan tool on a 97 OBDII display the >correct readout on engine torque from the transmission data? And just >what/where is the torque reading coming from? >Thanks, >Lee >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need
mechanical help let me – Hide quoted text — Show quoted text ->know I may be able to help you.
Response:
Hello Robert , I could really use some help with an 87 Celebrity wagon Driving home last night,, was moving along abt 65-70 mph put the cruise on ..abt 5 minutes later car started to bog down like it was running out of fuel ,,did that for about 30 secs. I shut off the cruise , was still bogging down , then seemed to run OK ..went abt 7 miles to the next exit got to the end of the ramp and it shut down.. looked around awhile abt 1/2 hour , started up went 10 miles , again it died..called a wrecker , towed it home Today, went out, started up fine..Idled it about 5 minutes it died ..Took out the module <Pain !!> had it tested ..checked out fine Dont know where to go now..any ideas ? Thanks !!
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Forgot to tell you – the 87 Celebrity is a 2.8 ltr
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Even though the ignition module tested fine on the bench, it can still be bad, because it may only be acting up as the module heats up. I’d bet money that if you immediately removed the ignition module when it stalled out and checked it, it would test bad. — Robert Hancock Saskatoon, SK, Canada Home Page: http://www.geocities.com/TimesSquare/Arcade/9967/ – Hide quoted text — Show quoted text – >Forgot to tell you – the 87 Celebrity is a 2.8 ltr
Response:
OK, sounds good but why does my stock Yukon show peak torque of 194lbs when factory specs show 330lbs? And my Blown Yukon shows only 402lbs at 4000 rpm? As you can see the Tech 2 shows more than a 50% increase over my stock truck but the numbers are pretty much meaningless (if I running 12lbs boost. The truck weighs just under 5900 lbs with me in it. Qtr Mile Jr. software says that I must have 379 net HP in order to do that. If you take 402 * 4000 / 5252 that only shows 306 HP or 73 HP short of achieving the required HP. So I believe that the Tech 2 torque readings are completely false! Any other ideas? Lee – Hide quoted text — Show quoted text – >I can answer that one……. >It is, or should be, reasonably close to a correct value. It is a parameter >based on an engine "torque model", not a value based on any type of >transducers…. >GM engineers spend "a whole lot" of time trying to perfect the torque model, >so it should be reasonably close. The torque model data is used by various >systems in the vehicle, primarily the transmission. The transmission >controls adjust line pressure during steady state operation or shifting >events in relationship to the amount of torque predicted. Traction control >systems also use data from the torque model. >Hope this helps… >TD >OK here goes…does the GM Tech 2 scan tool on a 97 OBDII display the >correct readout on engine torque from the transmission data? And just >what/where is the torque reading coming from? >Thanks, >Lee >>Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need >mechanical help let me >>know I may be able to help you.
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>Which modern GM engine is the most reliable?…also are there any to stay >away from either for high maintenance cost (for basic items, ie tune-up, >emissions etc.) or poor longevity? I’m referring to the popular ones like >3.1, 3.4, 2.2, 2.4, 3.8, >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need >mechanical help let me >know I may be able to help you.
the 3.1 and 3.8 are great v 6 engines. some 3.1 do have some noise from pistons on cold startups 2.2 is a good 4 cylinder but is known for cylinder head gaskets leaking coolant as for 3.4 and the 2.4 they are good engine but are expensive to fix
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– Hide quoted text — Show quoted text ->I have a 76 Chevy 350 with HEI in my Jeep. It was running fine one day and >now it only is firing one or two cylinders. I know this because I put a >timing light on each wire and only the #5 cyl. fires consistantly, a couple >others only fire randomly. I can keep the engine running by holding the >pedal to the floor and once in a while another cyl will fire up then die. >I’ve replaced the cap, rotor, module, coil, pickup coil, and condenser and >now I’m stumped. Today I’m going to try putting the whole distributor from >my spare junk engine in to try and track down the problem. >Please help. >Denny >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need >mechanical help let me >know I may be able to help you.
did you replace the plug wires
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>OK here goes…does the GM Tech 2 scan tool on a 97 OBDII display the >correct readout on engine torque from the transmission data? And just >what/where is the torque reading coming from? >Thanks, >Lee >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need mechanical help let me >know I may be able to help you.
no the tech 2 don’t read torque reading.
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– Hide quoted text — Show quoted text -> Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need mechanical help let me > know I may be able to help you. >My ‘98 Cavalier with about 12K miles emits a howling sound from the area >of the serpentine belt when first started in cold weather. The sound >occurs only in the range, I estimate, of 2,000 to 3,000 rpm and usually >goes away after five to ten minutes. I don’t think it’s related to >alternator load as it happens even when I roll the car down my drive to >jump start it. >The dealer says, "It’s the power steering pump building up pressure." >Is this a common problem? Any thoughts? >-RK- >– >Richard Koser >Croton Falls, NY >10519-0639 USA >Remove <sniphere> from >email address to reply > The Beginning of Wisdom is >to Call Things by their Right Names > Confucius
try lubing the belt with dressing, let me come if noise goes away
Response:
If your timing light is inductive, try cleaning the plugs. Inductive lights need a high voltage spike to trip the light and wet plugs decrease the voltage available in the wire. they act as a dead ground. Then find out why the plugs are wet. ps. ck the oil for fuel dilution if you’ve been cranking for a while. – Hide quoted text — Show quoted text – >I have a 76 Chevy 350 with HEI in my Jeep. It was running fine one day and >now it only is firing one or two cylinders. I know this because I put a >timing light on each wire and only the #5 cyl. fires consistantly, a couple >others only fire randomly. I can keep the engine running by holding the >pedal to the floor and once in a while another cyl will fire up then die. >I’ve replaced the cap, rotor, module, coil, pickup coil, and condenser and >now I’m stumped. Today I’m going to try putting the whole distributor from >my spare junk engine in to try and track down the problem. >Please help. >Denny >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need >mechanical help let me >know I may be able to help you.
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> Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need mechanical help let me > know I may be able to help you.
My ‘98 Cavalier with about 12K miles emits a howling sound from the area of the serpentine belt when first started in cold weather. The sound occurs only in the range, I estimate, of 2,000 to 3,000 rpm and usually goes away after five to ten minutes. I don’t think it’s related to alternator load as it happens even when I roll the car down my drive to jump start it. The dealer says, "It’s the power steering pump building up pressure." Is this a common problem? Any thoughts? -RK- — Richard Koser Croton Falls, NY 10519-0639 USA Remove <sniphere> from email address to reply The Beginning of Wisdom is to Call Things by their Right Names Confucius
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Robert, Maybe you can help with this. I have a 1999 new style GMC Sierra 4X4 extended cab pickup SLE. It does not have the electrochromatic inside rear view mirror with the compass. I would like to add the GMC optional one as I sure could use it in my work. It is not sold as an accessory but I might be able to get one from a totaled 99 Silverado LT or I’d order one if its too late for the LT. Would this be an easy install? Are the wiring harness/runs there to tie into? Thanks, Mike
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Thanks for your offer to assist I am considering the purchase of a 93 GMC Step van that has a 6.5 litre diesel engine in it. I have been told that this is on of the most unreliable motors GM has ever made. It has 120,000 miles on it, and I was wondering what kind of problems I might expect to have with it. I was told the injection pump would be the first thing likely to let me down, among other problems in the bottom end of the motor. The truck is otherwise in great condition, but I simply cant afford to have this thing tied up in the shop all the time. On the other hand, I’ve been told by other sources that there are no more problems with the 6.5L than any other comparable engine, and that I should not be so concerned. Any insight to offer ? Thanks again…. Jason
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Hi, I have a 1987 Cadillac Coup de Ville. It’s generating a code F32, followed by F.F., followed by 7.0 end code. The book said it is a BCM code, but it doesn’t give those codes. Any help in giving me the meaning of this code would be greatly appreciated. Thanks, Bob Allen >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need
mechanical help let me – Hide quoted text — Show quoted text ->know I may be able to help you.
Response:
Which modern GM engine is the most reliable?…also are there any to stay away from either for high maintenance cost (for basic items, ie tune-up, emissions etc.) or poor longevity? I’m referring to the popular ones like 3.1, 3.4, 2.2, 2.4, 3.8, >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need
mechanical help let me – Hide quoted text — Show quoted text ->know I may be able to help you.
Response:
Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need mechanical help let me know I may be able to help you.
Response:
I have a 76 Chevy 350 with HEI in my Jeep. It was running fine one day and now it only is firing one or two cylinders. I know this because I put a timing light on each wire and only the #5 cyl. fires consistantly, a couple others only fire randomly. I can keep the engine running by holding the pedal to the floor and once in a while another cyl will fire up then die. I’ve replaced the cap, rotor, module, coil, pickup coil, and condenser and now I’m stumped. Today I’m going to try putting the whole distributor from my spare junk engine in to try and track down the problem. Please help. Denny >Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need
mechanical help let me – Hide quoted text — Show quoted text ->know I may be able to help you.
Response:
OK here goes…does the GM Tech 2 scan tool on a 97 OBDII display the correct readout on engine torque from the transmission data? And just what/where is the torque reading coming from? Thanks, Lee – Hide quoted text — Show quoted text ->Hi, i’m an G.M. tech. This news group is a hobby for me. If anyone need mechanical help let me >know I may be able to help you.
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Here’s my question… On a 98 Astro, which transmission cooler line is the return from the radiator? The one to the top of the rad or the one to the bottom? Thanks… MM
