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Prev Professional Automotive Repair Technical Discussions for April 14, 2009
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Open Help Requests for GM
Help Request Answers
2005 Cadillac CTS 3.6L Starter VIN: 1G6DR56745
Hi guys, This car came in with lost keys. We have coded 2 keys no problem but it has a "service anti theft system" message displayed on the main sat nav screen, the key will not release electronically (can release it manually OK by pulling the pin) and it will...
1985 Chevrolet Cavalier 2.8L MIL Lamp on VIN: 1GJE67W0F7
mil on always, checked pcm unable to read data or pull codes. performed trouble tree diagnostics and found prom the problem. unable to locate any proms either updated to speed density or standard mass air operation. does anybody have a prom or car lying around...
1987 Chevrolet El Camino 5.0L Misfire VIN: 3GCCW80H9H
Hello, I have an elcamino here that has a misfire on #1 cylinder. The customer came in requesting a tune-up.We did sparkplugs,wires and cap/rotor.We still have a miss.I have checked compression,all 8 cylinders are 180lbs,checked 3 times for a vacuum leak,disc...
1989 Chevrolet Camaro Iroc-Z 5.7L Fuel Guage VIN: 1G1FP2187K
Hi All; Customer had his 89 Camaro towed in to our shop and asked us to replace his in an in-tank electric fuel pump. Put in the new fuel pump, and it started and ran fine. The customer came back two days later saying that the fuel guage needle was now consta...
1996 Chevrolet Express 1500 5.0L radio VIN: 1GBFG15M9T
HI everyone hope you got something for this its strange vehicle came into shop after this problem has been to 3 shops and 2 dealerships the dealer told customer to pull raido fuse when he shuts off the truck i laughed ther has to be a way to fix the problem ri...
1996 Chevrolet G30 Sportvan 5.7L Cuts out, Stall VIN: 1GCGG35KXT
this vehicle had an engine replaced at another repair shop. came in with transmission electrical connector disconnected. found fuel pressure was low. replaced fuel pump, pick-up screen and filter. fuel pressure okay. now after connecting transmission electrica... Trouble codes: 32 (low egr flow), 66 (torque converter control circuit), 67 (2-3 control circuit)
1998 Chevrolet C1500 Cheyenne 4.3L Surge, Cuts out VIN: 1GTEC14W5W
This vehicle will run perfect for about 10 to 20 minutes and then it goes south. Starts and idles perfect all the time. I checked all the related sensor readings and found them to be well within specs. I did feel that the fuel pressure was a bit iffy, 54 to 58...
1999 Chevrolet Camaro 3.8L engine VIN: 2G1FP22K6X
have a misfire on cylinder #4. code comes up on a scan tool as p0300 random misfire.changed plugs and wires, changed fuel injector for the cylinder that has the misfire. swapped coils and no change. did a smoke test and no visible leaks. did a compression test...
2001 Chevrolet Blazer LS 4.3L Misfire VIN: 1GNDT13W91
about 3 weeks ago we replaced the intake gasket set due to coolant leaks...ran good for the those 3 weeks, then customer returned with a problem...the engine runs bad at 2500 rpm and up and poor gas mileage with engine light on. We scanned codes after test dri... Trouble codes: P0335 (testing and results)
2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J52
After replacing complete switch and tumbler (passlock) by which usually this problem is solved, same evening had same problem and same codes returned, relearned and ok at this time.Learning only once does the trick as vehicle will not flash security light afte... Trouble codes: B2965, B2960
2002 Chevrolet Blazer LS 4.3L front diff or transfer case VIN: 1GNDT13W62
when driving about 35 mph and push button for 4wd the vehicle will engage 4wd then a few second later will you will fell a jerk in the front end. the same will happen when switch back to 2wd. also if left in 4wd it will periodically do the same thing. another ...
2003 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNEC13T23
this truck misfires at idle ,has p0300 ,on misfire screen shows #4 and #5 misfire only at idle.once the rpm in raised to about 2000 it smooth.i swaped coils,injectors,wires,plugs but,it always misfires on 4 and 5.thanks for any tips. Trouble codes: P0300
2003 Chevrolet Silverado 2500 HD 6.6L Hydra-booster VIN: 1GCHK23103
Less than a month after the previous repair the vehicle came in with brakes dragging slightly, pedal would pull 1/2" toward floor with rpm increase, extremely sensative brake pedal, right rear slide and anti-lock activation at times. Determined to be Hydra-boo...
2003 Chevrolet Silverado 1500 5.3L High beam light on dash VIN: 2GCEC19T33
Hello out there. I was just wondering if any body has ran in to this before.03 chevy 1500 silverado has a slightly lit high beam light on the cluster even with the key out.When you switch the high beams the light on cluster goes bright like normal.also the amb...
1998 GMC Jimmy Envoy 4.3L rear rotors VIN: 1GKDT13W7W
Hey everybody! Customer came in with this one with the rear brakes sticking on slightly. He has replaced the rear pads twice in the last three months. He said that the mounting slides were free and the pistons returned back into the calipers easiliy. I was jus...
2003 GMC Safari 4.3L Flex Plate VIN: 1GKDM19X93
What should I be looking at that could cause the flex plate to break twice, the transmission had never been seperated from the engine before any advice would help thanks in advance
1989 Oldsmobile 98 Regency 3.8L Hesitation, Stall, MIL Lamp on VIN: 1G3CX54C9K
as per repair history, all components relative to cam sensor signal have been replaced. additional testing (at MY shop) shows the first test, unplug cam sensor, test A-B and B-C for 8-10 volts. A-B has 11.09 volts. B-C has 9.42 volts. all other tests test OK. ... Trouble codes: 41 (cam sensor signal)
2001 Oldsmobile Aurora 4.0L Misfire, MIL Lamp on VIN: 1G3GS64C51
Customer came in for multiple electrical and driveability concerns. Upon initial inspection I found the negative battery cable loose from stereo installation. repaired and everything is normal other than flashing check engine and code P0300 stored. Found cylin... Trouble codes: P0300 (random cylinder missfire)
2001 Oldsmobile Aurora 3.5L MIL Lamp on VIN: 1G3GR64H11
fixed relay wire and replaced pump (pump had water in it), drove 20 miles, next day drove another 20 and then the light came on while doing 50 mph getting off the highway. there isnt much left on this system besides the 2 valves and then the solenoid on the ba... Trouble codes: P0410
1976 Pontiac Firebird 6.6L valve train
Hi Pontiac Gurus I need help on this 400 Pontiac, I have a 1976 Firebird that had a blown up 400 under the hood, I found an engine but it needed to be bored and a fresh set of pistons installed, so I sent it to the machine shop for a bore job. The engine had a...
2000 Pontiac Grand Am GT 3.4L high rpm idle VIN: 1G2NV12E9Y
I know that there is an error related to the emissions system. but, the real problem that the car was brought in was because occasionally the car will maintain an idle at 3000 rpm and the customer can barely stop the car. This may not occur until you have stop... Trouble codes: P0135 (o2 sensor b1s1 poor performance)
2000 Pontiac Grand Prix GT 3.8L No Start, Stall VIN: 1G2WP52K1Y
This vehicle runs excellent, doesnt surge , miss or act up very often ( die's once every so often, not often enough) My biggest problem is that it is not very consistant, I have scope on the ckp signals at icm and fuel pressure gauge hooked up and also scanne...
2006 Pontiac Vibe 1.8L MIL Lamp on VIN: 5Y2SM65896
We have had a 2006 Pontiac Vibe, 2wd, A/T with the 1.8L (1ZZ-FE engine) come in with MIL on several occasions. First time it came in, No DTC's present using the Snap-On Modis. We use Global First, then GM specific through VIN. Neither one had codes or any stor...
2005 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ23D73
Got this Saturn in which the cooling fan stays on hi whenever the engine is running and it has a code for cooling fan circuit control. The customer had the car to the dealer and they said the ECM is bad. After checking the vehicle, I agree with the dealer's di...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Limited 3.8L Electronic VIN: 1G4HR52K9W
Received 3 responses on this one. One suggested using a Tech 2 (not available) One suggested a programmer and one to replace blend door actuator. Programmer was replaced before I posted and the blend doors perform flawlessly. After a frustrating week on this b...
2000 Buick Park Avenue Ultra 3.8L fuel gauge VIN: 1G4CU5216Y
Hi Everyone, Thank you for all the replies. The fix ended up being the connector under the passenger side rear quarter panel. We looked at everything else and tried everything else so we went back and double checked all the connectors. We had looked at this...
1992 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B2N
Thanks for all the replys. It turned out that several of the injectors were bad resulting in excessive fueling. after replacing the injecters that part of the problem was corrected. fuel trim and blm were still fixed at 128 under every driving condition. T...
1992 Cadillac DeVille 4.9L Excessive Emissions, Poor Fuel Economy VIN: 1G6CD53B2N
1999 Cadillac DeVille 4.6L content theft deterent VIN: 1G6KD544XX
This one was a very interesting problem. The cause was the OnStar system. I believe the vehicle thought it was in an acceindent and it was trying to call OnStar. Because when this system was made it used an anolog OnStar, but in 2002 everything went digital. S...
1992 Chevrolet Camaro Z28 5.0L Stall VIN: 1G1FP33FSN
after checking all ground and almost everything in the car. after spraying carb clean in intake when car would not start it fired up. did a pump volume test and got about half pint in 30 seconds. replaced fuel pump and now car will start 8 of 10 times when hot...
1999 Chevrolet Express 2500 5.0L No Start, hard start VIN: 1GCFG29M6X
Yahoo! I appreciate all of your help. Had a voltage drop at the relay (bad contact). Started better, but still had long crank time. Replaced the pump, pressure went up 5psi and starts like a champ. Odd part is there was no difference in amp draw between the ol...
2001 Chevrolet Blazer LS 4.3L Front Differential VIN: 1GNDT13W21
There is an easy way we found to install this front differential with Zero cutting or bending of any mounting ears-as I will explain in a moment. Also this method does NOT require jacking any suspension while it is on the lift (it is dangerous to jack while o...
1997 Oldsmobile Aurora 4.0L Pass Key Fault VIN: 1G3GR62C7V
Well, the Aurora is fixed. A new ignition switch was the cure. The loss of blower motor was the clue. It was losing one leg of power from the switch and powering down the passkey decoder. Andrew from Alberta suggested that the wires to the lock cylinder may be...
1997 Oldsmobile Aurora 4.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3GR62C4V
I recieved a lot of good suggestions, unfortunately all tests passed, and I have no decisive conclusion. My best guess at this time is a base engine problem, reinforced by a few things. First, I checked every possible component, from injectors to ignition to... Trouble codes: P0300.
2000 Oldsmobile Alero GX 2.4L Poor Idle Quality VIN: 1G3NK52T4Y
thanks for all the help. we found that the intake manifold gasket had a vacuum leak and that the throttle position sensor was reading faulty at idle. Trouble codes: P0171.
1997 Pontiac Grand Am SE 3.1L idle in park
Gentlemen I have to close this. Very little replies everyone thinks it is the vacuum leak, iac, TB but it is not. If it is the vacuum leak it would be leaking all the time even when cold not just when hot and when it is in the park. Thank you very much to tho...
1999 Pontiac Grand Am SE 2.4L timing chain tenninsor VIN: 1G2NE52T6X
I uesd # 4 new tenninsor and followed one of the guys directions abuot rotateing untell it locked out and then held it with a pry bar and had someone crank the eng till oil flowed out so far so good it's quiet.thanks.
2000 Saturn LS2 3.0L speedometer VIN: 1G8JW52RXY
Most relpies said BCM was culprit, and I would concur based on my research and vehicle diagnosis. The general concensus is that if the PCM is communicating the other gauge info : tach, temp, fuel level, to the BCM on the serial data line, the BCM is the culpri...
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