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Prev Professional Automotive Repair Technical Discussions for May 14, 2007
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L No compressor engagement VIN: 3G5DB03E32
Hello everyone, thanks ahead of time for any help provided on this mess. Ok here we go. My problem is the AC doesn't engage. Ac pressure is good at 90 psi enough to engage compressor. The ac high side pressure sensor is also good, reading 1.2volts and 90psi....
1990 Cadillac DeVille 4.5L Cruising by itself VIN: 1G6CD5338L
Car comes in having problem running away without accelerating, at stop ok, as soon as accelerating over 5MPH let go pedal, car can still keeps going up to 30MPH, replaced IAC, Adj TPS .57v with IAC retract & max out 1.14v, also replaced ECM, disconnect cruise ...
1997 Cadillac DeVille Concours 4.6L Misfire VIN: 1G6KF5490V
random miss fire on cylinder #2 then it blows blue smoke untill the miss goes away and the smoke clears up, then it wont happen again for 2-3 days, i did pull the number 2 plug when this was happening and it had raw oil on it, car does not overheat and i did a... Trouble codes: P0302
1998 Cadillac Catera 3.0L cooling VIN: W06V52R8WR
car came in with oil and water mixrd in radiator
1999 Chevrolet Corvette 5.7L Serpentine Belt VIN: 1G1YY22G7X
This car has a wicked vibration at idle. The belt tensioner shakes so bad it bottoms out and amplifies the noise ten fold. Chevy warranteed the tensioner and belt about 3000 miles ago. It shakes the whole car under load at idle. Hopefully some of you great GM ...
2000 Chevrolet S10 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GCCT19W7Y
hi this t10 pick up has had this problem on and off for the past 6 months, now it is here at all times and worse when hot. code p0339 crank sensor ckt sets. with a lab scope hooked up and driving vehile on the road. pattern goes haywire above 3500 rpm, a gm cr... Trouble codes: P0339 (crankshaft position sensor ckt)
2001 Chevrolet Astro LS 4.3L Misfire, MIL Lamp on VIN: 1GNDM19WX1
Hey guys, this Chevy Astro is taking my lunch, the car came in for a misfire, code p0300.perform a major tune up, it got a lil better but now the vehicle only misses when you push on the gas pedal with vehicle idling. the vehicle has new tune up, new cam and c...
2002 Chevrolet Express 3500 LS 6.5L Cuts out VIN: 1GAHG39F22
2003 Chevrolet Impala 3.4L compressor VIN: 2G1WF52E13
Help G.M. techs.Compressor will not engage,pressures are fine.Body computer recognizes a/c switch signal,but the data parameter in the PCM data for a/c request says no.I can command compressor on with scan tool.The pressure signal voltage value on the scan too...
2003 Chevrolet Suburban 1500 LT 5.3L No Start VIN: 1GNFK16Z23
I have a Suburban that intermittenly turns over and won't start. Has spark and fuel pressure, but no injector pulse. Has no trouble codes stored. I have already installed the electrical portion of the ignition switch. When checking with a scanner the theft det...
2004 Chevrolet Malibu LS 3.5L Steering VIN: 1G1ZT52824
Hello out there, this is a 2004 Malibu with electric steering assist. When driving the car, it steers much easier to the left than it does to the right. On a lift with the wheels off the ground, steering wheel straight, when you start the car the steering whee...
2005 Chevrolet Classic 2.2L fuel pump VIN: 1G1ND52F25
this car came in last week with a vary intermitant no start it seems to happen more on hot days after it has been sitting in the sun but will also die every once in a while when coming to a stop while driving. some times if you start the car over and over agai...
1996 GMC Yukon SLE 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKEK13R8T
Hey everyone, I make it a point not to post unless I am up against it, and with this one I am. This 96 Yukon 5.7R has been to multiple shops with many parts replaced, and still a check engine light/misfire. I have found all cylinders show misfires, as well as ... Trouble codes: P0300, P0172, P0175
2000 Oldsmobile Intrigue GL 3.5L Starter VIN: 1GEWH52H5Y
This car will start cranking on its own with the key out of the ignition, sometimes it's a continuos crank and sometimes it's a very harsh kicking in and out. Currently it is not acting up so it's a little hard to pin point it any futher. I strongly suspect th...
1997 Pontiac Sunfire SE 2.2L a/c VIN: IG2JB1243V
i need a diagram for the a/c pressure switch.i got a pig tail to replace the one that is missing i got a diagram from alldata,but it just gives colors and the letter .i called my local dealer they said thay cant get it.i just need to know what a b c is on the ...
2001 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW52E11
Car was towed in for a no start one month after an automatic start system was installed by an alarm place. Security light was flashing. I changed the ignition switch with an aftermarket unit and did one 10 minute key on relearn procedure as per Alldata service... Trouble codes: B2600 (Undocumented code)

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Century Custom 3.1L Poor Idle Quality VIN: 1G4AG55M3T
Ok this was just one of those jobs that make you say why do I work on cars but I got it a lot of you said to try a pcm well I all ready had tried that and I rechecked the grounds and I then decided to start all over I took off all the new parts except for the ...
1987 Cadillac Eldorado 4.1L Blower Motor VIN: 1G6EL1181H
Thank you to all who have replied. It turned out to be the BCM. The blower had been replaced recently (Red flag anyone?) and the power module was good. I finally located a diagnostic proceedure and folowed it. Step one: Unplug BCM, fan on? Yes, replace BCM. ...
1995 Cadillac DeVille 4.9L abs VIN: 1G6KD52B8S
Hey all, I'd like to start by thanking everyone who offered their valuable time to help. Against my stern advice the owner wanted me to install a used pump/motor assembly that he supplied. When I began removing pump I found a section of wire that was almost br...
2000 Cadillac Catera 3.0L Cooling Systems VIN: W06UR54R5Y
I got 6 responces from this. After replacing the thermo switches and the relays which there are 5 of them, The overheating is gone. Drove for 70 miles and the cust. has had it for a week, and all is good. The main relay which I think was bad, is the grey one. ...
2001 Cadillac DeVille DHS 4.6L swps VIN: 1G6KE57Y61
Thanks for the replies, they were very helpful. We decided to go with the SWPS because it's much more likely and the responses. It fixed the car. I'm not sure why the 5v would not show up on the scan tool. We only have the snap-on brick so my guess is that it'...
1981 Chevrolet Corvette 5.7L door locks VIN: 1G1AY8769B
I want to thank those who replied to my help request , Especially [...]...He sent me a wireing diagram for the 81 vette that helped ''A LOT ''... I began by making my own test lights... Four all together...Hooking two test lights on each doors plug goin...
1986 Chevrolet P30 7.4L Hesitation, HARD FULL THROTTLE F VIN: 1GBKP37W8H
Thank you all for the help, Went thru carb again, adj sec open spring up and down no help. Tried coil etc, double checked plugs wires etc with no avail. Replaced Carb assm and worked like a charm. Figured internal crack or blockage. Again thank you for your he...
1995 Chevrolet Caprice Classic 5.7L No Start, Hesitation, Cuts out, Stall, Misfire VIN: 1G1BL52P5S
Hi All, first I would like to say thank you for the overwhelming response. 56 replies was a lot to sort through, but we got it knocked out. A lot of people hit on the cat being plugged, which wasn't the case, but that's my fault. I should have been more specif...
2004 Chevrolet Express 1500 LS 5.3L Power Stering VIN: 1GNFH15T84
A big thanks goes out to Dennis, Ed , Robert , Clay , Josh [...] & Carlos. As most of you indicated it was the pump. I retested vehicle while running at idle and power stering assist was marginal. I ran rpm up to 1500 power stering got better , at 2500 rpm power ...
2007 Chevrolet Tahoe LTZ 5.3L Left Front Door VIN: 1GNFK13057
Thanks to everyone who took the time to respond to my challenge vehicle. I truly hope that this post helps someone else in the future. In hind sight I wish we would have done less teardown and more tinkering and shimming. THE SOLUTION: HEAVY LUBRICATION OF T...
1993 Oldsmobile Cutlass Supreme S 3.4L convertible VIN: 1G3WT34X0P
thanks for all the replies. ted from fla. suggest that i try dissolving some fluid in water to see if it was brake fluid or not. it did not dissolve so it must be some type of hydrualic fluid. since it was clear we decided to empty as much as possible and fill...
1999 Oldsmobile Aurora 4.0L serp belt VIN: 1G3GR62CGX
Sorry, but the olds isn't quiet yet. Pulley alignment and the tensioner are the consensusas to the cause of the trouble. I'm going replace the belt and tensioner, recheck the pulleys & their alignment and wait for 6 months for an fix or not. Thanks Mike
1994 Pontiac Firebird Formula 5.7L Misfire VIN: 2G2FV22P9R
Thanks to all that replied. The distributor was the problem. This problem was driving me nuts. The cost of this distributor was outrageous, $472, from GM. We tried locating used one and found that their are 2 different styles, one is vented and one is not. The... Trouble codes: 16 (low resolution pulse circut), 18 (injector circut).
1997 Pontiac Grand Am SE 3.1L tail or running lights VIN: 1G2NE52M3V
I would like to thank all that responeded . The fis tuened out to be something simple.Someone had wired the radio and left 2 wires bare and would ground intermetintly . The wire were for the dash lamp's and tail lamps.. Go figure thinking of something hard but...
2000 Pontiac Bonneville SSEi 3.8L Stability Control VIN: 1G2HZ5414Y
Well I had many good replies regarding this vehicle and I had to verify the repair and leave it with the customer for a week or so to verify no other problems. Well here was my conclusion regarding this outcome. First all powers & grounds were verified and tes...
2002 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JS14432
Replaced signal wire from tPS to PCM, appears to have corrected the problem to date. Thanks everyone Trouble codes: P0122 (p0705-), P0705.
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