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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 12, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1992 Buick Regal 3.1L No Start
Hello My Fellow Techs,This vehicle came in with check engine on and that diagnoises came out to being a bad egr valve, 1 month later vehicle comes in on the hook and will not start no matter what I do. I have replaced the ECM cause i could not read ECM with my...
2000 Buick Regal LS 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on, instrument cluster VIN: 2G4WB55K2Y
Greetings techs, this Buick is getting the best of me. Customer complains of intermittant dies. Upon initial startup it started a little hard and ran ragged momentarily. A test drive didn't confirm the stall but the service vehicle soon light and the traction ...
1969 Chevrolet CAMARO 350CID a/c VIN: 124379L508
this is a show car i agreed to work on but is becomeing a headache after replace all new parts listed evac and recharge sys 90 degree here pressure show ls 38 hs 160 cools to 55 degrees at 2000 rpm when eng is cold as eng warms up vent temp rises to 68 hs 175 ...
1984 Chevrolet K30 Custom 6.2L Alt VIN: 1GCHD34JEF
i need a wiring diagram for this 24 volt charging system our fax #[...] thank you all and happy wrenching
1988 Chevrolet Allegro RV 454CID cruise VIN: 1GBKP37WXJ
This rv has a gray Dana cruise control box. I cannot locate a wiring diagram for this system anywhere. I would be very appreciative if anybody could email me a schematic. Thanks.
1994 Chevrolet Camaro Z28 5.7L extended cranking VIN: 2G1FP32P1R
This has very extended cranking time. Once it starts, we see some black smoke come from exhaust. It clears out quickly and runs fine. We have ruled out intake leaks and vac leaks. O2 sensors and fuel trim are normal, no ignition system problems found. Suspect ...
1997 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCT19W8V8
Truck came in with check engine light on, had code p1441, we checked system & cleaned road dust from evap vent valve & turned engine light off. Customer came back 2 day later with light on again & same code set. We inspected further & found no leaks & solenoid... Trouble codes: P1441 (evap system flow during non-purge)
1998 Chevrolet K2500 Cheyenne 5.7L shifts and pulling VIN: 1GCGK24R8W
Hello guys got one here thats stumping us. We got this 2500 on the hook and they said that it quit pulling this is an oil feild truck and has seen its share of abuse. We proceded the next day to bring it in and found that it pulled its self in so we looked at ...
1999 Chevrolet K2500 7.4L Poor Idle Quality, Stall VIN: 1GCGK23J1X
this truck has been at several other shops and now it is here. the truck has a low idle all the time. iac is completely shut even though the des idle speed is incorect. the truck will stall in gear at times. lt and stft are ok. maf =6gps. check computer codes ...
2001 Chevrolet C3500HD 8.1L fuel gauge VIN: 1GBJC34G11
this truck was purchased as a cab and chassis with a stake bed.we removed the aux fuel tank in the rear to convert this truck into a wrecker and needed the room for the wheel lift.the fuel gauge now reads empty all the time and low fuel is indicated in the inf...
2002 Chevrolet Corvette 5.7L rack? VIN: 1G1YY22G82
This super fast vette has a shimmy when tipping the wheel above 85mph. Does not do it at any speed below that. Owner likes taking it to open track events so he complains about this all the time. I built the engine and trans so he thinks I can fix this too. Nee...
2003 Chevrolet Silverado 2500 6.0L MIL Lamp on VIN: 1GCHC29U03
hey guys here's one I'm stumped on. code po140 recurring. have replaced 02 (bank 1 sensor 2) vehicle does have a slight intermittent miss on cylinder 1 and 2 (more 1 than 2). O2 will vary but only from 0-532. even at a raised idle. will not go higher while all... Trouble codes: P0140
1993 Geo Storm 2+2 1.6L Hesitation, Stall VIN: J81RF2361P
Ahead of time, thanks for your help! Especially when cold, this GEO starves for fuel when put into gear or when accelerating. On occasion, it dies when put into gear. Carb clean will keep it running. Also boggs down to the point of almost dieing when goosing ...
1997 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBJ186XV
I have done everthing listed in alldata to test this sys. Everything works properly without fail...cannot get dtc to reset myself...but, about once a week the mil comes on with no symptoms, just this code. Any experience with this dtc would be appreciated... Trouble codes: P0400
2001 GMC Yukon Denali 6.0L steering VIN: 1GKEK63U21
Vehicle setting at idle, turning the steering wheel left from a lock right position, the steering hangs up or gets hard and has to be powered through these hard spots. Am able to raise rpm up and problem goes away. My thoughts are a problem with the steering p...
1995 Oldsmobile Achieva S 2.3L engine VIN: 1G3NLI5D95
Hi Recieved this car as a poor running condition, bad timing chain,bad starter, bad oil pressure, installed fresh engine, runs fine, no codes, starts fine. However after warm up and test drive notice temp always around 220 on gauge. So verify with scanner ,whe...
1995 Oldsmobile 88 Royale LS 3.8L Cuts out, Stall VIN: 1G3HY52K6S
Car intermittantly misses a beat. sometimes at hyway speed, sometimes at ide. will stall and restart OK. No codes. cannot duplicate at will. Thanks in advance. Due to the low mileage, everything checks out as being new! I hope someone has shared this experienc...
1995 Oldsmobile 88 Royale 3.8L no start VIN: 1G3HN52K1S
i have this olds here cranks but does not start check fuel press fnd 55psi while cranking fnd code for pass key ii error intermitent no inj pulse not familiar with this pass key sys read some posts about no crank and it being ign stch but this one cranks but w... Trouble codes: P1629 (pass key ii error)
1996 Oldsmobile Cutlass Ciera 3.1L No Start, Poor Idle Quality, Surge, Cuts out, Stall, Misfire VIN: 1G3AJ55M4T
I thought the problem was gone when I replaced the injectors. I was wrong, I have run every test possible on this car and I still cant find the problem. It keeps cutting out once it goes into closed loop, could it be the prom? I tried adding additional grounds...
1985 Pontiac Firebird 5.0L Poor Idle Quality, Hesitation, Stall VIN: 1G2FS87H3F
Hello all need help with the cob webs in my mind!Car came in with cold start problem will start ok when cold but falls on it's face under load and will stall out at times.I have looked at the things i remember from the old days but have come up short.Purge val...
1990 Pontiac Grand Prix Mclaren 3.1L Poor Idle Quality VIN: 1G5WP14VXL
I have 1990 pontiac grand prix 3.1 turbo, the car came in with a check engine light on, code 34. Map sensor signal low, engine vacumn is at 20 hgs,the car runs rich and idle quality is poor. The following parts have been replaced by past mechanics, all this is...
1999 Saturn SL2 1.9L fail smog VIN: 1G8ZJ5274X
Thanks in advance. this is my wifes car and it failed smog due to failing readiness status. it passed everything else. It failed on cat, evaporitive system, 0/2 sensor and egr system. It passed on secondary air system and heated o/2 system. it is not supported...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Chevrolet S10 2.8L No Start VIN: 1GCCR19R2J
I received 10 replies on this help request and truly appreciate each one who took the time to help me through this time of trial. Some said to check the TPS to be sure it was working properly. I had already checked it before I posted but failed to mention that...
1991 Chevrolet Lumina Euro 3.1L compressor VIN: 2G1WN54T8M
Almost all were correct on this one. It had a really sensitive pressure switch on the power steering pressure line.It was causing the ecm to turn off the AC compressor at idle. Thanks for all the help.
1994 Chevrolet Caprice Classic 4.3L Differential VIN: 1G1BL52W8R
Through some further research I found the correct part number for the powertrax locking diff for this application. Seems like there is alot of confusion w/4.3L V8. A number of parts guides have this engine listed as a V6 and that throws the whole process off. ...
1996 Chevrolet C1500 Cheyenne 5.0L Cuts out VIN: 2GCEC19MXT
Thankyou all for the good ideas and suggestions...The owner of the vehicle decided to drive it until the problem becomes more consistant or the vehicle dies alltogether. I tried everything suggested with the exception of trying a new fuel pump..(my pressures...
1997 Chevrolet Blazer 4.3L Monitors wont run VIN: 1GNDT13W5V
Thanks to all who replied. Probably the biggest mistake I made with this one is not keeping the vehicle overnight. Embarassingly all that was wrong was a bad battery. When I got the vehicle back for an overnight visit, I noticed a very slow crank for the first...
1998 Chevrolet Express 3500 5.7L Stall, MIL Lamp on, Severe spark knock VIN: 1GBHG31R0W
After several replies, one person showed up to give me a hand, we founf the injectors causing a lean running condition, and also used a ray tech temp. gun on the exhaust manifolds to find that one was about 100 deg. cooler than the others. after doing a block ... Trouble codes: P1345 (Crank/Cam Correlation Problemb).
1999 Chevrolet K1500 Suburban 5.7L MIL Lamp on VIN: 1GNFK16R9X
Most said look for intake vacuum leaks or that aftermarket cat converters were at fault. Also was suggested that possibly wire harness damage might be present. I started with testing the wire harness, checked for continuity of each wire to the PCM and checked ... Trouble codes: P0137 (oxygen sensor voltage low b1s2), P0157 (oxygen sensor voltage low b2s2).
2000 Chevrolet Blazer LS 4.3L Fuel Gauge VIN: 1GNCS18W7Y
well all i ended up replacing unit with another from same supplier and this time all seams good. we got supplier to give us a labor clame also. but we have yet to see a credit
2000 Chevrolet Blazer LS 4.3L No Start VIN: 1GNDT13W8Y
hello-fixed it---found bad connection at coil connector-had power going in and moved the harness around and the car started- the wire going to the ignition control module was broken inside- the only thing frustrating is that this check wasnt on the trouble sho...
2001 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Surge VIN: 1GCHK24161
Hello to all, cust.brought truck back to dealer w/print outs from iatn and showed them to the tech. He aruged that the fuel presure regulator couldn't be causing to problem. Untill he look at the reading and said hey your right there's a differance in actual a...
1995 GMC Jimmy 4.3L Cuts out VIN: 1GKDT13W75
Thank you to all who took time for me! I did originally replace the fuel filter (many replies suggested this), i simply neglected to state that in my first post. As a few said, the heat builds up at the point of the resistance. The female connector in the rela...
1996 Oldsmobile 88 Royale 3.8L Surge, Cuts out, MIL Lamp on VIN: 1G3HN52K7T
the customer opted to take vehicle as is I did find that when the maf sensor went to 124htz I lost power to the battery wire on the sensor itself. If I powered the wire up while it was acting up the Maf went back to normal. I could not find the reason for loss... Trouble codes: P0120 (maf frequency low).
1997 Oldsmobile Aurora 4.0L oil leaks VIN: 1G3GR62CXV
We decide to go the long route and pull the subframe out and I guess in this case it will turn out best because we found several other seeps from the cooling system and power steering system that would of been hard to spot otherwise.
1998 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on VIN: 1G2WP5218W
Well first I would like to say sorry about not replying so soon but I just fianlly got the opportunity to fix it. The boos solnoid was located where I thought. It was located right below the TPS. The dealer called it a plung valve; they had not listing for a b... Trouble codes: P0300 (random misfire), P1629 (theft fuel enable-incorrect/no sig), P1646 (boost sol/5v ref c/evap vent ckt).
2000 Pontiac Montana 3.4L No Start VIN: 1GMDUO3E2Y
Thanks guys for your helped and info. The module the dealer gave me was the wrong one. After talking to the parts guy we know at the dealer for giving me another one and returning the part. They found out that the one they sent me is a wrong module even though... Trouble codes: 1631 (incorrect security message from PASS-Key module), U1301.
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