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Prev Professional Automotive Repair Technical Discussions for August 17, 2007
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Open Help Requests for GM
Help Request Answers
2004 Cadillac CTS 3.2L brake booster VIN: IG6DM57N33
hello cadi techs i have a problem/ this cadillac, brake booster started leaking the morning after the brake work was done, no visible reason, so, due to the cost of the booster we decided to install a used one, but to our surprise, it started to leak just as t...
1997 Chevrolet Lumina 3.1L compressor VIN: 2G1WL52M0V
I just got this Lumina in here and I came upon a perplexing problem I've never seen before. The new compressor is from a mfgr called Valeo. On the label it states the compressor has PAG 46 oil in it. Of course the label on the car calls for PAG 150. (P/N 12345...
1997 Chevrolet K2500 Cheyenne 7.4L extended crank VIN: 1GCGK29J9V
I want to thank everyone inadvance on this one, A very good friend of mine has this 97 K2500 with a 7.4, he brought the vehicle in with a missfire, I found 4 out of the 8 injectors leaking so i advised him to doo all 8 injectors in the process of doing the inj...
2001 Chevrolet Corvette 5.7L air outlet temperature VIN: 1G1YY22G91
Car came in with Climate control unit display inoperative. Left side air outlets did not get as cool as right side. Replaced control unit and there was no change other than display now works. Called GM help line and they suggested changing "left acuator". Foun...
2002 Chevrolet Tahoe LS 5.3L MIL Lamp on, INT NO START VIN: 1GNEC13ZX2
Hello once again. I have a 2002 Chevy Tahoe that has an intermitten check engine light. The only code that I could retrieve is a po179. According to the customer he says that at times on first start attempt it cranks longer than normal. The check engine light ... Trouble codes: P0179
2002 Chevrolet Tahoe LS 4.8L Power Door Locks VIN: 1GNEK13V22
Only the drivers door locks/unlocks automatically, with all 3 switches and key fob. All 4 doors and tailgate should lock. All works with key, just not with power. I'm thinking on the lines of a BCM, but do not know how to test without TECH II. My Modis shows n...
2002 Chevrolet Silverado 1500 4.3L Misfire VIN: 1GCEK14W82
Vehicle came in no power & misfire found miss on 2,4,6 replaced plugs & wires. Still misfiring 2,4,6 also still no power fuel pressure good, cap & rotor good I need help Trouble codes: P0300
2002 Chevrolet Impala 3.8L No Start, Stall VIN: 2G1WH555KX
this one is leaving nothing else but the pcm. after 20 min of driving the vehicle cuts out and won't start sometimes 5 min or hour. has no codes, no spark fuel presure is normal and injectors flash irratic and dim with a noid light. injectors and module have 1...
2007 Chevrolet Silverado 2500 HD LT 6.6L tpm VIN: 1GCHK23607
This is not a "Classic". It is the new body style. Rims and tires were changed with the ones listed. The stock tires require 80 psi, while the replacement tires require 50 psi. The Tire Pressure Monitor continuosly lights up indicating a problem. I can not loc...
2000 GMC Sonoma SL 2.2L hard start VIN: 1GTCS1943Y
Hello,this truck has a long crank only when its hot and sits a short while.The fuel pressue is good and holds perfectly,doesnt bleed down.Never had any codes,sensor data looks ok(tps,map,coolant temp).The computer is up to date with most current flash.Tryed a ...
1997 Pontiac Sunfire SE 2.2L timing chain VIN: 3G2JB5247V
We will be changing a timing chain on this engine due to noise -I understand that there is a TSB for a plugged oil passage. My question is can the timing cover be removed without removing that oil pan.The engine is still in the vehicle. Mitchell and Alldata sa...
2001 Pontiac Aztek 3.4L hvac VIN: 3G7DA03E21
Cusotmer complains of ac quits blowing cold for no reason. Happens at different times, also comes back on at different times. Not consistant when it fails or works properly. Does not stay off for very long. First thing that I did was take the pressure readings...
2004 Pontiac Grand Prix GT2 3.8L Steering VIN: 2G2WS52204
hi everyone this one has us stumped you can drive this car for weeks and have no problem then it will throw on a check power stearing light abs trac then the stearing wheel gets stiff hard to drive once you cycle the key or clear the lights drives fine again. ...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue 3.8L fuel guage VIN: 1G4CW52KXW
Thanks to all who responded,i had no access through a reset hole so i used the magnet idea, worked great. I did not have a 20 oz. magnet so i stacked several magnets together and it worked, had it repaired in 30 seconds. This is the first time have I have used...
1991 Cadillac Allante 4.5L Trunk lock VIN: 1G6VS3386M
Eliminated current draw by unplugging all connections associated with BCM and CPM. Thus by exchanging BCM and CPM with new units the draw went from .8 amp to a managable .18 amp.
1995 Cadillac DeVille 4.9L Poor Idle Quality VIN: 1G6KD52B6S
Thanks to all who responded. Mark from Louisiana gave a detailed re-learn procedure that seems to have fixed the problem. I don't mean to be critical, but some of the suggested fixes were things that I had already tried and had talked about in my help request...
1995 Chevrolet Astro CL 4.3L Excessive Emissions, MIL Lamp on VIN: 1GNEL19W6S
When we first saw the high voltage from the ECM on the O2 circuit and the ECM not seeing it we thought it was a ground problem at ECM. Unfortunately when doing the testing at the ECM we missed 1 ECM ground that was bad (it was not the O2 ground). There is a gr... Trouble codes: 13 (O2 Open or shorted).
1997 Chevrolet Monte Carlo Z34 3.4L lamp VIN: 2G1WX12X3V
thanx for the help, we replaced the lock cylinder which most said and was my first thought but we have not run across one that still started with the lamp on steady. Now we have i guess. thank you again
1998 Chevrolet Blazer 4.3L Cuts out, MIL Lamp on, SPARK KNOCK VIN: 1GNDT13W8W
2001 Chevrolet Impala 3.4L No Start VIN: 2GIWF52E11
Customer dropped off car for a couple of a days and I had a hard time duplicating the problem. I then let car run with the heater on for about an hour. I noticed the battery light and the security light coming on. I shut car off and it would not crank. I check... Trouble codes: U1255 (Class 2 communication), U1301 (Class2 short to battery), B2960 (Theft system), U1064 (Loss of communication), P1626 (Theft system).
2002 Chevrolet Avalanche 1500 5.3L Misfire, VIN: 3GNEK13T92
I have typed "fixed"- but I really don't know whether it is fixed- but it is gone. Customer probably has been lost. The response I got showed they were not really reading the post- major concern was two cats very short period of time, no DTC's thrown/stored fo...
2001 GMC Safari SLE 4.3L service AWD light VIN: 1GKEL19W31
Customer took vehicle and has not returned for further service.
1972 Pontiac lemans 350CID Poor Idle Quality VIN: 2D69M2P198
I don't know if it is really fixed, but the carburetor was previously replaced with a rebuilt one. We swapped it back to the original. I had a lot of good suggestions. The mileage listed is the actual miles, so a bad cam would be hard to believe. The spark...
1991 Pontiac Firebird 3.1L Hesitation, Cuts out VIN: 1G2FS23T6M
All of you with the bad injector advice were right. We had ohm the injectors the plug. The tech that did it found everything is specs. I took off the plentum unplugged the injectors the 2 middle ones were out of spcs 8.1 and 3.0 should be about 12.0 ohm. ...
2000 Pontiac Grand Prix GTP 3.8L a/c compressor VIN: 1G2WR5212Y
The customer will install a switch to activate a/c climate and he will wait later for repair. All the system work normally but the pcm did not received the signal by the cluster. Probably a short to gnd or voltage on wire to the cluster.
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