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Prev Professional Automotive Repair Technical Discussions for April 20, 2007
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Open Help Requests for GM
Help Request Answers
1993 Cadillac DeVille 4.9L High Idle VIN: 1G6CD53B9P
First I feel stupid for posting this because I have seen this before.I have a caddy that did have a high idle,and a clicking noise from the ISC motor when the engine has been turned off.customer istalled a new TPS incorrectly,the voltage was at .13.I set it to...
2003 Cadillac CTS 3.2L Power Windows VIN: 1G6DM57N73
Thanks in advance for any help with this one. We replace spark plugs, fuel filter, and crank position sensor. Disconnected positive battery cable to do repairs. Now when you push the L/F power window switch, both front windows go down. When you push the L/R wi...
1993 Chevrolet K1500 Cheyenne 5.7L Oil Pressure VIN: 2GCEK19K1P
This is my first post, so be patient. This truck was originally brought into my shop for a leaking intake gasket. Gasket was replaced as was the intake after the heater hose fitting broke off and has corroded away half of the threads. Oil was changed immediatl...
1995 Chevrolet S10 4.3L Lighting VIN: 1GCCT19Z35
The brake lights are staying on on this, I have disconnected the stop light switch and they still stay on. It has factory trailer wiring, and I took off the 4 wir connector. It looks like there is a centre high mount stop lamp relay in the diagram. I have mitc...
1996 Chevrolet Caprice Classic 4.3L Cuts out VIN: 1G1BL52W2T
this caprice is driving me nuts. it likes to cut out intermittantly for no aparent reasion. when it cuts out its like you turned the ignitian off after about ten min of driving or it wont happen. very intermittant. its not loosing fuel pressure scoped ignitian...
2000 Chevrolet Malibu 3.1L Stall, Misfire
all help is good help.good friend of mine brought in his vehicle.has a compliant of engine stall only when a/c on.But mention that is a intermitten problem.No dtc found.However did have history dtc for egr and abs module problems.per scan tool found multiple m...
2000 Chevrolet Silverado 1500 5.3L Misfire, MIL Lamp on VIN: 1GCEK19T7Y
yesterday this truck had a hard miss mainly on #5,7 cylinder and they were getting spark I switched injectors around and no change. did compression check and 150psi. check back pressure on exhaust and under .5 psi. fuel pressure regulator is not leaking. but f... Trouble codes: P0135, P0300, P0446, P0463
2003 Chevrolet Silverado 1500 5.3L speedometer VIN: 2GCEK19T73
Hi, I'm lost on this. I've checked alldata and picked some area brains and still stumped. I just overhauled 4l65e transmission (4X4). Pre overhaul determined no 3rd gear. no codes present. speedo worked properly. disconnected battery and removed transmission. ...
1995 GMC Jimmy SL 4.3L Pedal feel VIN: 1GKCT18WXS
Ok this is my wifes rig and she is saying that the brakes are hard lessend assist. I drove it and sure enough when you hit the brakes like in a panic stop the pedal is firm then returns to normal but it just seems like the booster isn't able to boost fast enou...
2003 Oldsmobile Alero GL 2.2L security system VIN: 1G3NL52F03
vehicle came to us as an auction car with horn operation erratic. first found intermittant horn operation when touching the center of wheel. found intermittant open at the wheel. replace contacts which corrected open. now when you touch the horn it sounds cont...
2000 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NF12T6Y
We have had this vehicle for some time, customer finally traded in after so many problems diagnosing this concern. Withscan tool connected fuel pump relay isnt engaging all the time, when fuel pump relay is in off state vehicle wont start, intermittantaly the ... Trouble codes: U1000 (Class 2 serial comm prob), U1040 (Loss of EBCM / EBTCM communications), P0336 (CKP Sensor A 18/24X outof range), P0340 (Cam Pos Sensor Problem), P0440 (Evap System Fault), P1632 (Theft sys fuel disabled)
2000 Saturn LS2 3.0L MIL Lamp on VIN: 1G8JW52R6Y
this customer called me and asked for a tow into the shop from a nearby town because the car stalled and then would crank and not start but she wound up being able to start car after waiting one half started up for us but on road test it would stall a... Trouble codes: P0727, P0421
2003 Saturn Vue 3.0L MIL Lamp on VIN: 3GZCZ53463
hi everyone Im making this post for a friend of mine that works at a local firestone. on 2 different days they had a saturn vue and a 05 equionox with code 128 ECT below thermostat regulating temperature but did not find any issue this is just for future refer... Trouble codes: 128

Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac DeVille 4.9L ebtcm VIN: 1G6KD52B3S
hey everybody thank you for your great insight! the customer has yet to return the caddy for me to finish diag, when she does i will update. i am sorry i dont have better news, i hate loose ends,but she has been away on buisness. thank you all who took your (v...
1988 Chevrolet C1500 Cheyenne 5.7L engine VIN: 2GCEC19K4K
Well guys, I would like to thant every body that helped me try to find this problem. I never could find the problem even after consulting with 4 other local techs and all working on the vehicle one night. We are all experienced techs and we tried all the possi...
1993 Chevrolet C1500 Cheyenne 5.0L Misfire, Poor Fuel Economy VIN: 2GCEC19HXP
thanks to all who responded!! this was another case of sweet aftermarket parts the rebuilt distributor did indeed have cracks in the magnet ( weak magnetic field ) . after replacing with a dealer set up no more miss!!! it took a little while to get the custome...
1994 Chevrolet K3500 7.4L Poor Idle Quality, Stall VIN: 1GBJK34N4R
The aftermarket fuel pressure regulator kit did nothing. Replacing the whole top plate on the TB, with regulator from GM fixed it.
1997 Chevrolet Blazer 4.3L Misfire VIN: 1GNDT13W2V
no compression on number 2 cylinder due to bad valve.
1998 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: R1W1174063
We suspect the problem to be a sticking valve guide. We pulled the distributor out and the gear looked fine. We got a lot of helpful advice and members who had similar problems and what they found to be the fix. Customer didn't want to pursue any more in depth... Trouble codes: P0300.
1999 Chevrolet Express 2500 5.7L abs module VIN: 1GCGG25R2X
thanks to everyone who replied, turns out the pads were definetly causing the pull. thanks to everyone i really appriciate it very much!
2001 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation VIN: 1GCEC19T21
All 8 suggestions received were appreciated; however, those items were addressed and eliminated. After about 10 days, we called the customer and he said the vehicle was doing much better than when he brought it in. Actually, he said he was quite happy with the... Trouble codes: P1133 (Delphi HO2S Monitoring Bank 1 not switching), P1153 (Delphi HO2S Monitoring Bank 2 not switching).
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCCT19W61
Thanks to all who replied ,the computer as suggested did the trick, the hi spike on the scanner is gone and the veh is running good . we had to have it flashed by the dlr. to start the veh . when it was test driven the check engine lamp came on , but for a cra... Trouble codes: P0101.
2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1CTHK29183
thanks to those who responded .. I probably jumped the gun here. It ended up needing a better ground at aldl connector. Once we could communicate with it we got it to crank... (his goal for the day) they have a lot of assembly left to get the engine ready to r...
2003 Chevrolet S10 4.3L dash area VIN: 1GCDT19X83
thanks to all that replied.noise was accel cable rubbing on pcv hose and valve rattling. replaced valve and reposition cable.
1998 GMC K1500 Sierra SL 5.7L Steering Control VIN: 2GTEK19R1W
Thanks To All Who Replied. Replaced The Sensor On The Bottom Of Steering Column & Took It For A Ride. Didn't Get Any More Jerking In The Wheel So I'm Going To Say Success. Thanks Again
2001 Oldsmobile Intrigue GL 3.5L MIL Lamp on VIN: 1G3WS52H71
Thanks for all the help, I learned a lot more than I thought I would need to know about this system. The fix wound up being the air check valve, of course it was the harder one of the two to replace but it wasen't holding vacuum. When I called to order it the ... Trouble codes: P0410 (Secondary Air Injection System).
1997 Pontiac Grand Am SE 2.4L Rear Brakes VIN: 1G2NE52T5V
Well, apparently this is a pretty common problem. In this case it was just that the friction material on the rear shoes worked too well. There were no apparent problems with the old shoes or the adjustment. However, replacing the shoes with a different brand s...
1999 Pontiac Bonneville SE 3.8L No Start, MIL Lamp on, lacks power
Well thanks for the info folks... The power issue seems to be CAT, but the customer has decided to go no further with this vehicle... She has had nothing but problems with this thing since it was new and she feels that trading it in would be her best option...... Trouble codes: P171.
2001 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW52E11
Received 5 replies and 4 of them suggested rechecking the connectors and continuity which I did. All were OK. If all checked out, then next step was to replace the PCM. Never got the chaance as customer decided to drive it as is since there is no driveability ... Trouble codes: P0030 (O2 Heater circuit malfunction B1S1).
2001 Saturn L200 2.2L theft deterrent VIN: 1G8JU52F51
Well,after checking harness again,all grounds,and all bcm powers and grounds,nothing changed. However,I did notice that shift interlock wasnt working (never even tried it before). The bcm was not receiving request from pcm to ground solenoid.Checked the brake ...
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