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Prev Professional Automotive Repair Technical Discussions for August 27, 2010
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Open Help Requests for GM
Help Request Answers
2004 Buick LeSabre Limited 3.8L battery VIN: 1G4HR54K94
i have a batery drain of 1.82 amps (after 30 minutes) when disconnecting fuse 37 (hvac battery) or i.p. module under dash the draw goes away. tried a used ip module out of same car but no help drain is still not have a tech 2 to check module status.
1991 Cadillac Seville 4.9L Parking Brake VIN: 1G6KS53B6M
Good morning, this caddy came in for an unrelated A/C repair. I noticed the parking brake does not release automatically as it should. If I apply vacuum to the release servo the brake releases. My question is where does the servo get its vacuum signal from? Th...
1977 Chevrolet K5 Blazer Custom Deluxe 5.7L Cuts out, Power loss VIN: CKL187F116
OK guys, this is my baby and I am dumbfounded. I first must admit I am not that knowledgeable when it comes to carburetors, so I followed Edelbrock’s tuning procedures, and it ran fine until a few weeks ago. Accelerating around a corner, I got a cloud of trans...
2004 Chevrolet Impala SS 3.8L No Start VIN: 2G1WP551X4
car came in no start cranks. car started and ran for 20 min.after car stalled checked for spark and fuel pressure ok lost injector pulse. have cam and crank signals checked with lab scope.power and grounds look ok. installed new computer with no good
2007 Chevrolet Avalanche LS 5.3L High Pressure VIN: 3GNFK12337
We hae this Avalanche with a 4L60E 4sp transmission that is shifting hard due to Pressure Control amps read "0" on desire and command. Their are no codes for the transmission and no engine codes. Transmission was rebuilt for no move and had burn't clutches. Pr...
1988 GMC S15 2.5L Starting VIN: 1GT8S14EJ8
Vehicle towed in with a start and stall problem. Will run if you spray carb cleaner. Has 9/10 lbs. fuel pressure. Will run if you hold key in start position, but dies if you let go to run position. Will stay running if you disconnect alternator wires to field ...
1995 GMC C3500 Sierra SL 6.5L Stall VIN: 1GDKC34F9S
Thanks ahead of time for the help. Truck was towed in for a start and stall. Truck started and stayed running. when it warmed up it stalled. It will refire right away but stalls again. The longer it sits for the longer it runs. I pulled codes 35 and 36 and see... Trouble codes: 35 (Injection pulse width error response time too short), 36 (Injection pulse width error response time too long), 93 (cylinder balance error)
2003 GMC Sierra 2500 HD 6.6L MIL Lamp on VIN: 1GCHK23123
Greeting fellow techs. This truck has had this problem for almost 1 year now. It is very intermittent- have never had it happen on test drives etc. At first the vss in the transfer case was replaced and the transfer case was rebuilt. Problem still came back. W... Trouble codes: P0500, P0700, U1152, P0721, P0746
2004 GMC Envoy SLE 4.2L ABS module VIN: 1GKDS13S24
Has code CO110. I checked both connectors at the EBCM(good), and cleaned and tightened the ground on the frame. Cleared the code, went 10 feet and code comes back. The fuses are good and the red wire has 12 volts at the EBCM. From what I understand it is the m...
2004 GMC W4500 Forward W4S042 4.8L No Start, hard start VIN: J8DC4B1645
Tough one here. This engine starts hard; must crank excessively and most times it won't start, but it wants to and nearly does. Customer reports engine has always had long crank times/been hard to start, but recently is worse and he had it towed in here. The e...
1995 Oldsmobile Silhouette 3.8L stumbles on start VIN: 1GHDU06L95
Hi Thanks for taking the time to read this. I havent seen this before. Upon cranking to start it sounds as if the timing is over advanced, it will spin grunt and then start. If it had a distributor i would retard the timing.But it dosent so I cant. No codes st...
2002 Oldsmobile Bravada 4.2L No Start, Hesitation, MIL Lamp on VIN: 1GHDT13S52
Hello everyone. I have this bravada in here with a real intermittent problem. this truck is from another shop who gave up on it. I have never had the truck in a no start problem but cust. states it will not start at times. anyway scanned for codes and found a ... Trouble codes: U1000, P1683, P0116
1994 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52L0R
Heres my problem. EGR valve will not open when on engine. Remove EGR valve and it opens normally and pintle position matches commanded EGR. All supply voltages and grounds are the same mounted or unmounted. This valve will only go on one way. What could I be m... Trouble codes: P1406 (EGR pintle position error)
2002 Pontiac Sunfire GT 2.4L Poor Idle Quality VIN: 3G2JD12T22
Got the car in due to overheating. Diagnosed that no problem, it needs a new rad fan. No big deal. The problem is that the idle speed stays at about 1250 all the time. If I try to test the iac it will change the idle speed, but not properly. I can choose eithe...
2005 Pontiac Sunfire 2.2L friction disk VIN: 3G2JB52FX5
We have a 2005 Pontiac Sunfire with [...] on it that we have previously replaced the the clutch, pressure plate and throw out bearing on twice already within 10,000km and is now in for a third...The friction disk material on the flywheel side of the clutch ...

Fixes & Summaries for GM
Fix/Summary Answers
1986 Buick Regal Grand National 3.8L Poor Idle Quality VIN: 1G4GK4774G
Hi guys, thanks for the help and sorry for the delayed response. I got the camshaft set up correctly. As it turns out I had a bad ECM. I noticed on the road test the ECT and MAT sensors would drop out to -40. Tap on the ECM, it ran rough and stalled. Once I re...
1995 Chevrolet Cavalier 2.2L Misfire VIN: 3G1JC1243S
OK gang, I have asummed the position and you may start kicking my butt at will. The car has No fuel delivery from injectors #2 and #3. (failed injectors). I still can't believe that this puppy didn't light up those cylinders with the extra combustables we blew...
2000 Chevrolet Tracker 2.0L pedal VIN: 2CNBJ13C7Y
Well its out the door and there were more problems then I thought.I finally got the front brakes working by replacing the brake hoses on both side and still didnt get a good pedal.On the back there is a bleeder screw for the load sensitive Valve and the bleede...
2001 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC52401
it was the starter. listening to the car crank over it didn't seem to be draging,but the engine would kick back like the timing was too far advanced.i guess when it kicked back the engine set the codes. looking at freeze frame records it would show engine run ... Trouble codes: P0336, P340.
2006 Chevrolet Impala LS 3.5L cruise control VIN: 2G1WB58K96
So after rechecking voltages .I now had voltage at back of bcm but not at switch. I replaced inflatable restraint steering wheel module coil and problem is fixed. Thanks everyone for all your help.!!!
2006 Chevrolet Silverado 1500 LS 4.8L Starting VIN: 3GCEC14V56
Well got bit by the "aftermarket bug", The owner had installed some audio stuff & ran a wire from the underhood fuse box to something behind the dash, he ran the wire inside the factory wire loom which made it difficult to see. Disconnected the wire and have h...
2006 Chevrolet Trailblazer LT 4.2L Cuts out, Misfire VIN: 1GNDT13S26
2007 Chevrolet Silverado 3500 HD LT 6.6L cleaning VIN: 1KR09KDFO9
thank you all your input is invaluable the customer ask the right question will not speding the money void his warrantee they said no. me being sold on most of the BG products put some 244 in and gave him a bottle of the additive for him to add at fillups he i...
1994 GMC Sonoma SLS 4.3L Hesitation, Surge, Cuts out VIN: 1GTDT19W9R
I tried putting a new gear on the end of the distributor (it did look beat up) and it didn't help. I then put an entirely new distributor in and it didn't help. Still has the same problem. I don't think I will ever work on one of these engines again!! To m...
2006 Saturn Ion-2 2.2L Starting VIN: 1GXA155F06
Thanks so much for the help guys .the 3 key starts is what fixed the car and it did take about 4 times so if you have this problem be patent.
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