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Prev Professional Automotive Repair Technical Discussions for September 21, 2007
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Open Help Requests for GM
Help Request Answers
1996 Buick Skylark Custom 2.4L MIL Lamp on VIN: IG4NJ2T5TC
After driving for a few minutes check engine light comes on with ETS off light. checked gas cap,lines from throttle body ok, vent and purge solenoids ok,they switch on and off and seem to be releasing pressure when I blow in them and operate solenoids manually... Trouble codes: 440 (Evap system)
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1996 Buick Skylark Custom 3.1L Battery VIN: 1G4NJ52M9T
Hey Techs,this is my first help request so i'll do my best to discribe the situation. This customer of ours has a parasitic draw of 165-180mA using the low-current amp probe. The battery seems to drop .3 to .4 volts over night. My tests begun with the traditio...
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1986 Cadillac DeVille Touring 4.1L Cuts out, Stall, Misfire VIN: 1G6CD6986G
Hello all, I have a long time customer of mine with an old Deville which has recently developed a driveability problem. We put an engine, goodwrench remanufactured, in this car a year and a half ago after he overheated his old one. 11 months ago it was a c... Trouble codes: 53 (Distributor signal interrupt)
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2000 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR6YR06
Thanks in advance. I repaced the engine for a catastrophic engine failure. Loss of oil pressure spun rod bearing. Since the engine replacement which has only been 150 miles ago. I have this reaccuring MIL lamp for P0411. I verified the Air Injection Motor will... Trouble codes: P0411
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2001 Cadillac DeVille 4.6L Suspension VIN: 1G6KD54Y61
Customer has complaint of noise in rear of car mainly on left turns. We installed new Delco air shocks last year and now she says noise is back. Dealer told her it was the rear shocks. We changed them again today but seem loud on the rack when shaking back and...
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1985 Chevrolet Corvette 5.7L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 8XF5126801
Thank you guys in advance for your time & help. This car runs like a bag of worms.We have replaced the above parts to no avial.It has no cats,the injectors are within specs with the old time balance test.They are within .3 ohms of each other hot.no other code... Trouble codes: 33 (maf sensor high)
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1991 Chevrolet S10 2.5L No Start, no start, hot only VIN: 1GCCS14A2M
i hope someone can help, we have a 91 s-10 2.5l truck that starts fine when cold, but will not start when hot..? we have fuel pressure and spark. a small shot of starting fluid will start vehicle. it appears that we have no injector operation under cranking wh...
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1994 Chevrolet S10 Blazer Tahoe 4.3L rf speed sensor VIN: 1GNDT13W9R
This blazer driving me crazy test drove found that at aprox. 50mph right front wheel speed on scanner would go to 115mph and left front and rear wheel speeds would remain proper! if speed exceeds 50mph then the scanner goes blank and all wheel speeds go to 0mp...
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1995 Chevrolet S10 4.3L Surge, Misfire VIN: 1GCCT14W9S
This motor has just been rebuilt at our shop-customers request-heads rebuilt/crank kit/cam bearings and shaft/lifters and so on-of corse in this process we replaced cap/rotor/plugs/wires and coil-the problem i am having is when your cruising around 50 to 60 it...
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1996 Chevrolet K1500 5.0L Pressure control solenoid VIN: 2GTEK19M6T
Brought to us from local trans shop. Harsh shift P0748 sets. Sometimes hot while driving, sometimes on cold start up sets. Once fault occurs, code can be cleared, but resets imediately on start up. Then problem will just go away. Trans shop Rebuilt trans aprox...
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1999 Chevrolet C1500 LS 5.7L Poor Idle Quality, Misfire VIN: 87CEC14ROX
Hi all This truck came in with cil. 2 and 7 not working so I changed the cap and rotor- no change. Cleaned inyectors and tested on bench and all work even. Scaned and no codes appear. Changed the plugs on 2 and 7 . Checked compresion and is oK for the Ks the t...
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1999 Chevrolet Blazer 4.3L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WXX
hey guy me again i want to thank you all again for all the help and info it worked wonders lets say i am now a gm man not all that complex rpo and vin codes i recomend learning it helps alot anyways i need to find out how to clean the intake on the blazer quic... Trouble codes: P0420 (cat sys low effic bnk 2), P0171 (FT Lean bnk 2)
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2000 Chevrolet Express 1500 4.3L No Start VIN: 1GCEG15W4Y
we have this truck that came in for no fuel pressure replace fuel pump,then we found battery load tested bad so we replaced it and what we come up with its hard to start in the morning but has good fuel pressure and we also replaced spark plugs but after it st...
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2001 Chevrolet Corvette 5.7L Traction Control VIN: 1G1YYZZG21
The ABS and the TCS warning lamps come on intermittantly (Only about 4 times during the life of the vehicle) It sets PCM codes P1571 & P1689 and EBCM code C1277, all related to torque signal communications between the EBCM and PCM. EBCM has been replaced. The ...
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2006 Chevrolet Cobalt LS 2.2L Misfire, MIL Lamp on VIN: 1G1AK55F36
help please. i have a 2006 cobalt that has an intermittent miss on 4 with a p0300 code. i tested the injector and coil with a scope, looked good. i have also swapped injetors, plugs, coil boots and check for spark with a tester on each cylinder...not loosing s... Trouble codes: P0300 (testing and results)
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1993 GMC G1500 Rally 4.3L stays in 2nd gear VIN: 1GTDG15Z2P
hey everyone and thank you ahead of time. the van first came in with an intermitent concern going into limp home mode, if you turned the van off and restarted it, then it would be back to normal. the van came from a tranny shop that "replaced" the transmission...
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2003 GMC Sierra 2500 HD SLE 6.6L trans VIN: 1GTHK29153
THIS TRUCK CAME TO US FROM ANOTHER SHOP.IT ALL STARTED WITH THE TRANSMISSION GOING IN TO NEUTRAL WITH A CODE P0735 GEAR RATIO ERROR IN 5th.THE CLIENT INSTALLED A USED TRANSMISSION AND TRUCK DID SAME THING. THE CLIENT INSTALLED A REBUILT TRANS THEN AND DID SAME...
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1992 Oldsmobile 88 Royale 3.8L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire, knocks on accel VIN: 1G3HN5312N
This car almost will not start when cold. When it does start runs very poorly. All scanner data looks normal. When you accell there is a knocking noise( not bearing type but like timing jump). After it warms up all is well. I noticed something very strange onc...
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1997 Pontiac Grand Am SE 3.1L starts and stalls
Well I am here cause this car is kicking my butt. I have a problem as soon as I start the car it will run for about 5 sec then stall and flash the theft light. I have checked voltages at the pass lock sensor and hav a 5 volt ref on the yellow wire 12 volts on ...
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2000 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WK52J91
car came in with engine light on scan computer and had code po440 evap system no other codes inspect evap system component for damage and checked good.also scanner does have evap fault histery weak vac. i do not have a pressure/purge station. i think the probl... Trouble codes: P0440
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Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Park Avenue 3.8L No Start, Poor Idle Quality, Cuts out VIN: 1G4CW53L9N
Buick fixed and shop peaceful again. Thanks to all who responded especially Rick. This vehicle actually had 2 problems,crank and ICM. My problem came from the air gap adjustment on the crank shaft pully. It seems that even though niether vane touches, the sign... Trouble codes: 17 (Spark reference circuit).
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1994 Buick LeSabre Custom 3.8L fast idle VIN: 1G4HP2L3RH
Ross [...] was on the mark. I went in this morning and hooked up first thing. This hadn't happened before but I turned the key to read tps & throttle % and there it was .62 - .58 - .63 --4% to 7% varying. everytime I checked this before it was .62v and 0% at i...
11
1992 Cadillac DeVille 4.9L water pump VIN: 1G6CD53B7N
Thanks for help; many mentioned electolysis, but that was checked earlier & fine. We had no heater core or radiator wear issues, just water pump bearings failing. A few guys mentioned that they have had repeat failures as well. I installed another Napa lifetim...
15
1993 Cadillac DeVille 4.9L Stall VIN: 1G6CD53B4P
Thanks to everyone who replied. After a lot of trial and error we found the IAC Motor was not operating properly causing the vehicle to stall intermittently. Perfomed the IAC Relearn and corrected the preoblem. Thanks again to everyone who offered insight to t...
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1996 Chevrolet Blazer 4.3L noise VIN: 1GNDT13W5T
Most of the replies were about a tech report of adding a timing chain tensioner. We tried this and it did'nt work. I'm going to pull the cam and inspect the bearings. I will let you all know how this works out. Thank you all Jim
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1998 Chevrolet Malibu 3.1L ac compressor VIN: 1G1ND52TXW
`AFTER GOING OVER COMPLETE WIRING HARNESSBCM FOUND NOT TO SENDING AC COMMAND SIGNAL TO PCM CUSTOMER DECLINES REPAIR UNTIL NEXT SUMMER THANKS FOR ALL THE HELP
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2003 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52JX3
most of the replies steered towards the ignition lock cyl and tumblers.. It has been replace with good results so far... Thanks Steve
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1994 Geo Tracker 1.6L master cyl VIN: 2CNBE18U5R
the problem was in the rear brakes accumulator, had internal bleed.
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2002 GMC Yukon SLE 5.3L MIL Lamp on VIN: IGKEC13Z92
Thank you everyone for your help. We removed the intake manifold and found that the #2 knock sensor looked like it had been in the ocean for ten years. We replaced both knock sensors and built a barrier of silicone around the sensors. This fixed the problem... Trouble codes: P0332.
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1998 Oldsmobile Cutlass 3.1L MIL Lamp on, Tach intermittent VIN: 1G3NB52M3W
We finally got the customer to come back so we could try suggestions. I checked ground connections at the bell housing and also at the rear of the cylinder head on odd bank (closest to firewall). All the grounds were good so we moved on to checking the ignit... Trouble codes: P0336 (24X Reference Signal Circuit), P0327 (Knock Sensor Signal Error).
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1997 Pontiac Grand Prix SE 3.8L fuel gauge VIN: 1G2WJ52K6V
Well, this turned out to be a problem inside the cluster. It had been shipped out for repairs and the company that did the work missed something. When we returned it to them and explained what was now happening they seemed to know exactly where they went wrong...
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