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Prev Professional Automotive Repair Technical Discussions for June 3, 2009
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Open Help Requests for GM
Help Request Answers
2004 Buick LeSabre Custom 3.8L steering VIN: 1G4HP52K14
This car came in with a hard steer at both ways at idle. Sitting in stall at idle hard steer if you take off idle about 200 more rpms steers ok. i noticed with pressure gauge at 700 psi hard steer when i raise the rpms 200 psi goes to 900 psi and steers ok. I ...
1999 Cadillac Eldorado ESC 4.6L Starting VIN: 1G6EL12Y0X
Customer brought car in for battery drain. We noticed that the RAP was not powering down or BCM was not timing out after 10 minutes. Hooked Tech 2 up and noticed that when the ingition sw. was in the lock position scan tool showed accessory. And when it was in...
2004 Cadillac SRX 3.6L No Start VIN: 1GXDE63774
Hi! Good customer is having problems with an intermittent no start condition. Typically seems to happen after refueling. Car will crank but not start until sitting for a brief while. If customer leaves vehicle running while fueling, she has not experienced th... Trouble codes: P0044
2004 Cadillac SRX 3.6L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GYEE63754
Hello good technicians out there. Here is the story. This Cadillac came in with a MIL on. We scanned the computer and found a P0420 code (Catalyst efficiency) as well as multiple cylinder missfires. Because of the millage we went ahead and replaced the spark p... Trouble codes: P0300 (random cylinder missfire detected), P0301, P0302, P0303 (missfire cylinder 3), P0304, P0306
2005 Cadillac Escalade 5.3L Poor Idle Quality VIN: 1GYEC63N25
diesels at idle in gear,sounds like diesel engine but runs OK,will not accelerat at full throtle until put in gear,fuel is ok,does not smoke and will go down the road with power[i put pedal to floor in nuetral and no acceleration period.
1993 Chevrolet C1500 Cheyenne 5.7L convertor VIN: 1GCDC14K4P
Emission falure due to high NOX. Tested and replaced EGR valve, check for codes after test drive all of the above codes were displayed.Vehicle runs and drives great, with no indication of any problems that are listed here. Since I am not as familiar with trans...
1994 Chevrolet K1500 Suburban Silverado 5.7L Mechanical VIN: 1GNFK16K1R
Vehicle came in with poor A/C cooling. Found compressor to be defective. Replace compressor, orifice tube, accumulator. Charged system with 4 lbs. Front unit blows very cold. Rear unit isn't blowing cold. Replace the rear evaporator and rear expansion valve. S...
1996 Chevrolet Lumina 3.1L Hesitation, Surge, Cuts out, Misfire VIN: 2G1WL52M3T
Ok fellow techs, I have a dinosaur giving me the blues. This Lumina came in a month or so ago with misfire codes and a PO420 (cat.). Customer complained of lack of power and stated that the car would not run over about 20mph. I replaced plugs and wires as well...
1998 Chevrolet Cavalier 2.2L Misfire, MIL Lamp on VIN: 1G1JC5248W
Hi guys, I started out by replacing the crank sensor, which turned into a nightmare when it broke off during removal. Anyway the problem remained, so after reading thru the archives, I then replaced the plugs and wires to no avail. I checked the wires from t... Trouble codes: P0335, P0341
2000 Chevrolet Suburban 1500 5.3L a/c VIN: 3GNEK16T4Y
car came in with a/c inop low in freon evac and recharged added die blowes cold for about 5 minites and then cycle compresser off jumped switch still wont come on ac requst on data list turns off when sits a few minites comes back on when compresser cuts off a...
2003 Chevrolet Impala LS 3.8L tcc VIN: 2G1WH55K93
This vehicle came in with transmission not shifting properly. Check engine light on and code p0742. Followed flow chart for this code in alldata. Vehicle originally came from a dealership where they replaced tcc pwm solenoid. After replacement of solenoid prob...
2003 Chevrolet Express 3500 6.0L Suspension VIN: 1GBJG31U13
This is on my personal work truck, so it is driving me crazy. I have a [...] Express Van with a Grumman-Olson work box on the back. I pull a trailer also, but the problem is there with or without the trailer. When applying the brakes, especially coming of...
2004 Chevrolet C5500 6.6L Fuel Lines VIN: 1GDE5V1134
This vehicle would clog up the fuel filter every month. So we droped the fuel tank and had it cleaned. The problem is when we disconnected the fuel lines at the tank, the seals (orings) rolled out and now we can't get them to fit into the groves properly. I ca...
2007 Chevrolet Uplander LS 3.9L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GNDV23107
I know this one is new and quite Hi-Tech but maybe someone has seen this before. This vehicle came in running very bad and had a code P0016 Crankshaft Position (CKP) - Camshaft Position (CMP) Correlation we ran the diag and found that the camshaft position sen... Trouble codes: P0016 (Crankshaft Position CKP - Camshaft Position CMP Correlation), P0011 (Camshaft Position System Performance)
2000 GMC Yukon SLT 5.3L Poor Idle Quality, hard start when cold VIN: 1GKEK13T5Y
The complaint is that they have to pump the gas when it is cold to start it. When testing we found that you had to hold the throttle open for it to start when cold. In checking the data stream on our Modis we found the Idle Air Temperature (this sensor is part... Trouble codes: P0420 (catalyst efficiency)
1988 Oldsmobile Cutlass Supreme International 2.8L No Start VIN: 1G3WR14W2J
vehicle was in the shop about 2 months ago for emission problems . checked codes none, but noticed pid data showed bad sensor readings ect -40 tps 2.90v etc replaced pcm after checking sensors,connections power and grounds. after replacing pcm i got a code 51 ...
1999 Oldsmobile Alero GL 3.4L readiness VIN: 1G3NL12EXX
can not get emissions readiness to set . cat, o2, evap, and h02 are not ready. have put nearly 200 miles on it and they still won't set. we are also in the process of tracing a code 0113 for the which is probably a ground, . any one know how we can get these t... Trouble codes: 0113
1999 Oldsmobile Intrigue GL 3.5L No Start VIN: 1G3WS52H8X
Vehicle only start up only when OBDII communicated to scanner. All other modules always communicate even when OBDII not communicate. I already change the ignition switch by looking in the archive but the vehicle still Not Crank. Please help I don't know what t...
2002 Oldsmobile Alero GX 2.2L No Start VIN: 1G3NK52F02
Hello All: This car was towed in to the shop and it started fine when unloaded. According to the owner she had been experiencing intermittent issues with it for some time. It had been to the point of leaving it, for up to an hour before it would restart for he...
1994 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Stall VIN: 1G2NE1532R
"calling all quad four experts!" the computer shows the wrong vacuum readings, but I have replaced the map sensor, oxygen sensor and fouled-rich plugs to no avail. It acts like it's backfiring when cranking, and only starts with the accelerator applied. I keep...
2000 Pontiac Montana 3.4L rear air switch VIN: 1GMX03E6YD
2002 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW12E52
Hello this grand am has no noid does have spark and fuel pressure NO SECURITY LIGHT ON if you spray brake clean it will run if you keep spraying sometime the inj will start to fire and the car will run for hours any help would be great thanks
2003 Saturn Ion-3 2.2L security VIN: 1G8AL52FX3
Well the repair history says it all, I sit here pulling my hair out and I have none trust me...lol. Any help please would be appreciated. I can only wonder if I have a faulty ignition switch, any thoughts, suggestions? Thanks Ryan.

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac Seville STS 4.6L Poor Idle Quality VIN: 1G6KY5294T
Confirmed Fix, Further cleaning of the trottle body. Focusing on the Butterfly. Thank you for your help.
1989 Chevrolet Camaro Iroc-Z 5.0L Rear Brakes VIN: 1G1FP21E2K
Thanks to all that replied. I replaced the master and got the rear psi up to 700. The rears still will not lock up under heavy braking but it was enough to stop the dyno. Thanks again.
1994 Chevrolet C1500 Suburban Silverado 5.7L Blower VIN: 1GNEC16K9R
I found that the Evaporator was replaced by another shop before and that the case was not sealed well. Several screws were missing out of the Evaporator case. I also replaced one of the flapper doors as the foam on the door was worn off. This did imporve the a...
1998 Chevrolet K2500 Cheyenne 5.7L heater core
Thank you for help. One of the other techs posted this without my knowledge. I was out fixing the truck. The noise was not water noise. The fuel lines were touching the bottom of floor after he did the intake job. Could hear the fuel rush and pumping. Thank yo...
2002 Chevrolet Avalanche 1500 5.3L No Start VIN: 3GNEC13T52
Thanks to all who replied,sorry I didnt realize I had to close this or and didnt know how but I got it.The vehicle starts and runs fine without the instrument cluster and all other modules scan fine.My request was to locate the sp205 splice pack so we could is...
2003 Chevrolet Tahoe LT 5.3L Steering VIN: 1GNEK13Z73
Unfortunately this vehicle has not been fixed yet. I want to thank everyone who took the time to help. Anything that was mentioned was throughly checked into. The steering shaft was mentioned several times. It definitely isn't the problem. The ball joints are ...
2004 Chevrolet Blazer LS 4.3L Alarm system VIN: 1GNDT13X44
Thank you all for the help. It turned out that the driver side rear door switch was intermittently dropping voltage to 2.45v and showing that that door was open and turning the interior lights on. Replaced switch and problem has not come back.
2004 Chevrolet Silverado 3500 LT 6.6L MIL Lamp on VIN: 1GCHK33204
replaced the turbo vane sensor and it seems to have taken care of the problem. it took forever to get the part from GM because of their bankruptcy problems. Trouble codes: P2564.
2008 Chevrolet Silverado 3500 HD WT 6.6L MIL Lamp on VIN: 1GCHK33678
Thanks for the two replies. What I found was the mass air flow reading was just a little too high ( 47gps at idle ). The cause was the wix air filter not making a good enough seal in the air filter housing, allowing air to pass by the filter. The wix version o... Trouble codes: P0101, P0401 (Egr Flow Insufficient).
1993 GMC P3500 5.7L head gasket VIN: 1G1JP32K6P
Thanks to all who responded. After reading all posts, looking at napafix, and discusing the situation with powers to be at the fire dept. I had the heads resurfaced, replaced the gaskets with felpro high performance gaskets, installed a high flow water pump ...
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