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Prev Professional Automotive Repair Technical Discussions for July 9, 2007
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52L2S
I just need one thing confirmed...At the red connector at the computer, the black feed from the cam sensor...should switch from about 5 volts to 0 volts, correct? I think I have a bad cam sensor, cause with a dig. volt meter, it switchs from 4.86 as a high and... Trouble codes: P0341
2003 Buick Rendezvous CX 3.4L MIL Lamp on, ALL WARNING LIGHTS VIN: 3G5DB03E53
Hi all, I have a good one here. 1st off, there are alot more codes in this that i did not mention, all of them are "U"codes dealing with loss of communication between all modules, so i did not feel the need to include them. When this thing acts up, the "anti-l... Trouble codes: P1626 (theft deterent fuel enable signal lost), U1096 (lost comm. with ipc), U1300 (class 2 data link low...shorted to gnd)
1997 Cadillac Seville SLS 4.6L compressor
hey guys, this one is very challenging for me, but maybe someone has an answer. a/c wont get cold, it keeps cutting out the compressor, low side at 40psi, high side at 225psi, accumulator is sweating, and the lines also. The line before the o.t. is hot, and c...
1998 Cadillac Seville SLS 4.6L Hesitation, MIL Lamp on VIN: 1G6KS54Y9W
the car runs fine at the shop. excelerating up a hill hot it runs bad, limp in mode. speedo works sometimes. speedo stops working under exceleration and comes back if you take your foot off the gas. the problem may have started after the water pump job that we...
1975 Chevrolet C30 Cheyenne 7.4L pilot bearing
I need a bearing number if someone could help. 1975 chevy 1 ton dually rear differential , gm 14t1 pilot bearing on end of pinion shaft. Apparently theres 2 different bearings, large and small, with small having 1" inside diameter. This is the one I need. loca...
1993 Chevrolet G20 Sportvan 4.3L Poor Idle Quality, Hesitation, Cuts out, MIL Lamp on VIN: 1GBEC25Z2P
Vehicle brought to me from another shop...customer stated that after an electrical storm that knocked out the central air in their home, the van then had a lack of power and would not shift..and the MIL was lit.The other shop stated no comunication with scan t...
2000 Chevrolet Malibu 3.1L Misfire VIN: 1G1NE52J74
hello, we have 00 chevy malibu ,3.1L with a steady mis fire hot engine only under load.from 1500 to 2000 rpm. car runs fine first 6to 8 miles after cold start. scan tool shows no mis fire codes or any other codes. mis fire counters all register 0.all scan tool...
2001 Chevrolet Express 3500 5.7L Starting VIN: 1GCHG39R51
Thanks in advance for any help. This van came in on the hook. Cust says that it died out while driving. Tried to restsrt but just cranks. Has good fuel pressure 45 psi. Has good spark at plugs. This thing doesn't even try to fire as if injectors are shutdown. ...
2002 Chevrolet Suburban 1500 LS 5.3L cooling system VIN: 1GNFK16TX2
This truck runs hot on highway (240-260 Deg F) we changed the coolant that was old but not rusty, the t-stat w/housing (twice once w/after market once w/OE)and it still runs hot, changed the fan clutch per customer request, and it still runs hot. Unfortunately...
2003 Chevrolet Express 3500 6.0L Starting VIN: 1GBJG31U73
hello all. I am hopingh someone can help me with this truck. The ingition cylinder on the broke.The key would not turn in any diretion. I replaced lock cylinder and tumbler. The key now tuns and engine turns over, it even sounds like its going to hit for a sec...
2003 Chevrolet Trailblazer North Face 4.2L No Start VIN: 1GNDT13S33
This viecle came from another shop. Vehicle pulled up into shop and customer turned off and the vehicle wouldn't crank over so they replaced the ignition switch. Still no crank and the gauge for volts wouldn't show volts with key in on position. Rechecked igni... Trouble codes: P1630
2003 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC12F43
Car was towed in. Customer was driving on the interstate and the car just died. I checked for fuel pressure and there is none. Relay was good but replaced anyway. I hear that the fuel pumps go bad a lot on these cavaliers but at 329.00 I want to make sure. I d...
2003 GMC Sierra 2500 HD 6.0L starter VIN: 1GTHK29U33
Truck towed in no start condition. Transmission shift indicator stuck in #2 position. Tested starter no power on ignition side. Scanner shows transmission in 2nd when really in park. Codes Po706 Trans range sensor error and U1041 loss of ebcm commuynications. ...
1994 Pontiac Grand Am GT 3.1L MIL Lamp on VIN: 1G2NW55M4R
Car is setting light and codes only at cruise on freeway. Car runs flawlessly aside from customer stating trans. drops out of lockup occasionaly. Checked EGR system and no problem found with circuit or ports. Finally replaced with a good use EGR and same resul... Trouble codes: 80 (Trans. component slipping), 77 (EGR solonoid)
1997 Pontiac Grand Am SE 3.1L No Start VIN: IG2NE52M3V
This is the wife's car. So please help meee.My best customer. Wife drove to the shop and shut the car off and then started car and starter stayed engaged then she shut the key off and he car would not restart.Checked power to starter no power on the purple wir... Trouble codes: P1629, Z21, Z23, Z28

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Park Avenue 3.8L blend door VIN: 1G4CW52L9R
Many thanks to everyone who replied on this one. Most of the replies centered on an undercharged system,which seems to have been the problem. It was about a pound low;I'm amazed it cooled at all. What threw me off was the pressures,which were obviously inadequ...
1996 Cadillac DeVille 4.6L runing rich VIN: 1G6KD52Y1T
I change the o2 sensor on bank #2 which turned out the check engine light,but couldn't find out why bank #2 was running rich.Thanks for the help. Trouble codes: P0153 (O2 Signal slow bank 2 sensor 1).
2002 Cadillac DeVille DHS 4.6L No Start VIN: 1G6KE54Y02
Hey everybody, Sorry for The delay,Your not going To believe this But one of my first checks was the battery,I disconnected the battery And tested with My midtronics and it Was good,Some guys were telling me ck ignition switch and the ground under The Altenat...
1970 Chevrolet Corvette 454CID Vacuum Wiper Cowl VIN: 194370S401
Hey Everyone! It appears that the shopkey version of the vacuum routing is incomplete. The wiper switch solenoid that is attached to the back of the tach is not on the diagram. This switch closes vacuum source to the control relay that applies vacuum to ...
1992 Chevrolet K3500 Cheyenne 7.4L Poor Idle Quality, Misfire VIN: 2GCHK39NXN
The heads were leaking and machine shop paid for repairs. Very frustrating!!!
1992 Chevrolet Camaro RS 5.0L Starting VIN: 1G1FP23EON
Thank You very much for every who responded, problem happened to be a secondary alarm system. Just bypass the killed on after market alarm and problem went away.. Cheers Peter
1998 Chevrolet Corvette 5.7L air flow VIN: 1G1YY22G4X
Want to thank everyone for helping with this vehicle. A special thanks to Steve for hitting it right on the nose. At first I didn't see the corrosion under the battery. Once I pulled the battery out I was able to see the harness was corroded. The vacuum l...
1998 Chevrolet Blazer 4.3L Cooling Systems VIN: 1GNCT18W3W
First, thanks to all who responded. With all that had been done to this vehicle, there wasn't a whole lot left. It was mostly split with half saying replace the water pump and half saying the fan clutch was bad. I still find it hard to condemn a fan clutch for...
2003 Chevrolet Trailblazer North Face 4.2L leak VIN: 1GNDT13S33
replaced trans test drove for a week customer pulled boat this weekend and all is well thanks to all who replied. pete
2005 Chevrolet Silverado 1500 LS 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GCEK13T75
First I want to thank all who replied. The fix ended up to be like so many suggested, the O2s for Bank 1. Several replies felt that my readings regarding the backpressure test were not unreasonable. I was also informed that several tool manufacturers offer ... Trouble codes: P0300 (Random Misfire), P0131 (B1S1 O2 Sensor).
1995 GMC Jimmy SL 4.3L Cuts out, Stall, Misfire VIN: 1GKDT13W0S
I wanted to wait to be sure the grimmlin did not reappear before calling this one fixed. I got a lot of suggestions unfortunately, most were ones I had already tried. Actually Paul [...] gave a lead in the right direction : Hi George, Check the two w...
1996 GMC C3500 Sierra SL 5.7L Stall VIN: 1GDJC34R5T
Tried the 3 suggestions which did seem to help, but was not near what you would expect on a bench test. aquired another sender from the dealer and it tested same. after seeing this I reinstalled old unit with no further problems. seems this is normal for this ...
2000 GMC Savana 2500 6.5L Cuts out, Stall VIN: F1Y1134640
This one is finally case closed; I replace the fuel injection pump driver module, the new Stanadyne module came with a little harness also. It took a long time to close this fix because I wanted to make sure that everything was running good, thanks to every on...
2001 GMC Sonoma SLS 4.3L ABS EBCM Circuit,Relay VIN: 1GTDT13W91
I only got three replies on this but they were right in the money and helped me come to a quick solution. Seven and Donnie told me to check power and grounds and I went over them good,cleaning and repairing them. I actually used a head light in the circuit to ...
2002 GMC w3500 4.8L 1-2 shift VIN: J8DB4B14X2
2002 GMC Yukon XL 1500 SLE 5.3L Excessive Emissions, Cuts out, Misfire, MIL Lamp on VIN: 3GKFK16Z72
Thanks to all that replied ! All were very good suggestions. Some that we had not tried or checked. But still no fix. We finally tried a new crank sensor and it fixed the concern. Talked to the customer the other day after him driving it for 4 days and he say... Trouble codes: P0336, P0300.
1991 Pontiac Firebird 3.1L pass key decorder VIN: 1G2SF23T9M
thanks to michael,joe,john,dennis,mark.you guys are great.it was wire under steering. i ohm test wire with key in it it was open wire. customer do not want tear down column. so got resistor to bypass vats and works good and customer is very happy. thanks iatn ...
2005 Saturn Vue 2.2L transmission VIN: 5GZCZ33D45
Thanks for the replies. This Saturn is gone to a dealer. The customer called Saturn and they told him Saturn could maybe help with this because it only had 48K. After towing it to a Saturn dealer they ended up charging him for a new trans.The customer told me ...
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