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Prev Professional Automotive Repair Technical Discussions for July 15, 2009
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
2003 Buick Park Avenue 3.8L A.B.S. module VIN: 1G4CW54K33
I run this help request once before and was closed before the customer brought the car back but what it does at higher speeds when you first hit the brakes it goes into abs braking for a split second then stops fine when I pulled the abs fuse the condition wen...
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1992 Chevrolet Corvette 5.7L Poor Idle Quality, Surge VIN: 1G1YY23P8N
We have replaced the left 02s and did a motorvac. The codes won't come back, car runs good but has a slight tip in hesitate and slight rough idle. On the highway we have around 116 BLM, 110 BLM at idle. Sprayed choke cleaner at intake and saw noticable differe... Trouble codes: 13 (left o2s or ckt), 45 (left o2s rich), 43 (ESC module or sens ckt)
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1996 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Misfire VIN: 2GCEK19R0T
about 2 months ago customer complaint was that the engine was misfiring. We could watch the misfire start on cylinders 5 and 7 then move to 1 and 3 as the vehicle warmed up. Fuel pressure and secondary ignition system are good. compression is good. We replaced... Trouble codes: P0161, P0172, P0175, P0300
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1996 Chevrolet C3500 7.4L fuel gauge VIN: 1GDKC34J3T
The fuel gauge needle bounces all the time. The gauge is accuarte. Have installed a tester at the purple wire from the module to the gauge and can sweep the gauge needle and there is no bounce. Tried the same test on the DK.BLU/WHT wire will sweep but bounce...
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2001 Chevrolet Venture LS 3.4L Hesitation VIN: 1GNDXO3E21
replaced engine 3 or 4 months ago and problem started customer complained van would hesitate and even stall sometimes pulling away from a stop. since was not happening before replaced tps map idle control whole intake and related parts from old engine cam sens...
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2002 Chevrolet Impala 3.4L Misfire, MIL Lamp on VIN: 2G1WF55E62
this car has a very slight misfire only at idle on cylinder #3. we have swaped plugs wires #3 ign. coil and replaced ign. module and #3 injector with no change. off idle it runs great but you can feel a slight miss at idle. there is no engine noise when runnin... Trouble codes: P0300 (misfire), P0303 (misfire)
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2003 Chevrolet S10 4.3L Hesitation, MIL Lamp on VIN: 1GCCT19X23
I actually owned this truck since it was new and now my brother in law has it and it seems to have developed a rather odd problem. He said it was running funny and the service light was intermittent. Upon scanning it the ecm reported that it detected a cylinde...
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2003 Chevrolet Silverado 2500 6.0L oil press gauge VIN: 1GCHK29U73
When you transmit on the Kenwood radio, the oil pressue gauge goes to zero,the low oil warning in the dash with the warning buzzer activate. If I unhook the antenna from the Kenwood, all ok. Thought the problem was in the c0ax routing,changed it with no differ...
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2003 Chevrolet Monte Carlo LS 3.4L TCC Circuit VIN: 2G1WW12E53
Code P0742-TCC Circuit stuck on. Problem only happens after transmission is at operating temperature, cold TCC works properly. Reading are as follows when cold in gear not moving: TCC Slip 731 RPM, TCC Duty %0, TCC Release On. After tranny warmed up and proble...
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2004 Chevrolet Impala LS 3.8L No Start, Cuts out, Stall VIN: 2G1WH52K74
Car died while driving, towed in. Car started ran fine. Tested fuel pressure and volume,ok. Then car would try to start and stall. If you keep rpms up, car will stay running, but every few seconds will cut out and mil flashes on for a second. ECM stops communi...
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1991 Geo Metro 1.0L No Start VIN: 2C1MR6462M
towed in no start. have spark and good fuel pressure, but no injector pulse, starts right up with a little squirt down the throttle body. I am trying to pull codes and for the life of me I can not find the aldl diagnostic connector. My genisys shows the connec...
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1996 GMC Jimmy 4.3L dies when stopping VIN: 1GKDT13W8T
customer drove car about 35 miles and called saying car ran great and then strated to die when coming to a stop, would immediately restart and drive fine until coming to another stop, would die but always restarted. I installed a fuel pressure gauge . when sta...
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2006 Hummer H3 3.5L A/C Blower motor
I can move ground from circuit to circuit and blower works correctly with all speeds. Can someone tell me where to look and find the ground that is used by the switch to complete the circuit? I know one must be dedicated ground, with the switch directing which...
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1995 Pontiac Grand Am SE 3.1L Starting VIN: 1G2NE55M9S
Vehicle blows PCM fuse at random, causing a no start condition. Some times it will blow the fuse instantly when replaced, other times the car will run for days even weeks before it does it again. I have researched fix data base with no luck. We have lab-scoped...
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Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Park Avenue 3.8L CV joint VIN: 1G4CW52K2Y
Thank You fellow IATN members. This was the first time I used a help request on IATN and boy, I was impressed with the responses. I replaced the passenger side cv shaft first with new aftermarket. Problem still existed. I then replaced the driver side. Pr...
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2001 Buick Regal LS 3.8L blower VIN: 2G4WB52K11
well its fixed...the problem was very intermitent at times the hvac would work flawlesly for days then the problem would happen.it was taced to a bad ignition switch.every once in a while there was 1 circut not being powerd up just so happens to be the circut ...
5
1997 Cadillac Seville SLS 4.6L compressor VIN: 1G6KS52YXU
After rechecking all componets for the 3rd time, still could not find problem.Had another of same make so I tried changing a few componets. The right high pressure temp switch(by fire wall) got everything working.It test good and did not throw a code. It is no...
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2006 Cadillac CTS V 6.0L MIL Lamp on VIN: 1G6DX67D46
Car will not be back. Transmission broke on the customer and it went back to the dealership.All we looked at was these two codes and nothing else. I did check AC Delco website for any update reflashes, but nothing to do with the complaint/code or symptoms. Mos... Trouble codes: P1182 (Supercharger inlet pressure sensor performance), P1101 (Intake air flow system performance).
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1988 Chevrolet Corsica 2.0L No Start VIN: 1G1LT5118J
at this point im going to have to close this post with out fixing due to timing out, since posting i have, checked the engine compression, found it ok, installed another crank sensor, ecm and ignition module with no change, ive tried to take the computor out ...
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1995 Chevrolet Astro CL 4.3L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GNDM19W9S
1st of all thanks for all the info. Found out that ecm was bad, hook up scope to ic wire going to ecm had bad wave lots of noise. repalce ecm ran better and didnt stall any more, but stills runs alittle rought burning oil. I did check egr valve someone aready ...
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1997 Chevrolet Lumina 3.1L Hesitation, Misfire, MIL Lamp on VIN: 2G1WL52M3V
First of all, THANK YOU to everyone for taking the time out of your busy day to respond with info on how this powertrain management system works and especially great ideas for testing and action. First principle = "Was it something that we did?" In this ca... Trouble codes: P0300 (multiple misfires), P1406 (EGR Pintle Position Circuit Problem).
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1997 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Stall, Misfire, Poor Fuel Economy VIN: 1GNDT13W3V
After running through everything you all helped me with, I had Napa warranty the plug wires, cap, and rotor. After that the truck ran smooth as could be. So the problem layed within a faulty tune up... Thanks alot for the help.
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2000 Chevrolet Monte Carlo SS 3.8L Surge VIN: 2G1W12K3Y9
We Fixed this one by accident. I pulled the plugs to pressure test cooling system over night for head gasket leak. Noticed they were Bosch. Pressure test lost 2psi over night,cranked engine with plugs out no coolant. I really hate the bosch plugs have all kind...
11
2004 Chevrolet Silverado 1500 5.3L gauges,radio,windows VIN: 2GCEK19T04
I CHECKED THE INDEX OF THE IGNITION SWITCH THREE TIMES IT WHERE IT NEEDS TO BE. RAN NEW GROUNDS STILL SAME PROBLEM. IF I PROBED THE YELOW CLASS 2 WIRE WITH A TEST LIGHT I CAN GET EVERYTHING TO WORK FOR A WHILE. CALLED DEALER THEY SAID BCM ON 4 WEEK BACKORDER I...
12
2005 Chevrolet Cobalt 2.2L power steering VIN: 1G1AK52F65
Thanks everyone for the info. I`ve learned that the p/s motor is the likely problem. And that the motors are on a national back order of at least two weeks.Sounds like their having a big problem with them.The customer is going to try to get the dealer to help ...
7
2007 Chevrolet Equinox LT 3.4L tpms VIN: 2CNDL63F67
Thanks to the 13 techs that replied. Most all the replies dealt with how to reset sensor position. We needed to know if there was a way to reset the sensor pressure readings since they all read a differnt pressure. We removed all sensors and did a visual inspe...
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1995 GMC G2500 Vandura 5.7L MIL Lamp on VIN: 1GDEG25K7S
Followed the no communication flow chart which said to replace PCM which I did but it did not fix the problem (also could not return PCM). Then flow chart said if PCM did fix problem to replace PROM. I replaced PROM and now vehicle runs good. I would just like...
8
2003 GMC Envoy XL SLE 4.2L strong odor VIN: 1GKET16S93
I HAVE CONFIRMED THAT IT IS COLLECTING FUEL IN THE WELL WHERE THE PUMP MODULE SITS,BUT NOW THE CUSTOMER IS TRYING TO DECIDE WHETHER OR NOT TO SPEND THE MONEY FOR REPAIR OR BUY A NEW CAR UNDER THE CASH FOR CLUNKERS PROGRAM,SO THIS ONE MAY GET FIXED BY WHATEVER ...
10
1996 Oldsmobile 88 Royale 3.8L Stall, Noisy Fuel Pump VIN: 1G3HN52K5T
Thanks for the help, I replaced the Carter pump with an AC Delco. The Delco pump has a heavy steel ring around the base of the pump. I assume that this is for noise/vibration dampning. The pump is now quiet. The fuel filter still gets warm when running, bu...
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