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Prev Professional Automotive Repair Technical Discussions for May 21, 2007
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Open Help Requests for GM
Help Request Answers
1989 Buick LeSabre Custom 3.8L No Start, Intermitent VIN: 1G4HP54C7K
Engine cranks over fine, but will only fire up on every other key cycle. Literally...crank - start. crank-no start. crank-start ... and so on. In addition the car is lacking in power. We are aware that the fuel pressure is in the lower than acceptable range an... Trouble codes: 43 (ESC Problem)
1993 Buick Park Avenue 3.8L Poor Idle Quality, Hesitation
ok Guys heres one for you . Custmer stated runs rough and hesitates when cold. Acts like coged converter when cold. once warmed up drives fine but i have some bad info from data stream. these are what i read under idle cold or hot. Custermer states that her br...
2001 Buick Regal LS 3.8L control head VIN: 2G4WB55K81
good morning, we are working on a 2001 buick regal, the ac control head just locks up, blower and controls go to default, and the head will go off, the light on the head will be lit on the off button, we have replaced the control head with a new one from the d...
1997 Cadillac DeVille 4.6L SRS side airbags left/right VIN: 1G6KD52Y8V
Cadillac men... I have a 1997 DeVille with Side Airbag Malfunction codes B1147 & B1148. Very intermittent and I have nothing to go on. My iATN search turned up nothing and scan data on Mastertech,Mentor and Modis have nothing to offer.GM has a "Product Safety ...
1999 Cadillac Catera 3.0L gas tank slow fill VIN: W06VR52R0X
Gas nozzle keeps kicking off when trying to add gas to tank. Disassembled some body pieces for access. Filler neck is part of tank. Alldata info is not very complete but it seems that venting during filling happens through neck and carbon canister system. Info...
1992 Chevrolet C3500 Cheyenne 7.4L Hesitation, Surge, Stall VIN: 2GCHC39N71
Engine will always start up, has proper idle flair, drops to base idle then will die. Engine will run on alternative fuel source.
1994 Chevrolet K1500 5.7L Poor Idle Quality, Hesitation, Poor Fuel Economy VIN: 2GCEK1919K
have installed vortec heads using gm performance intake manifoldvortec design for tbi p/[...] we are encountering drivability problems at low speed under 2000 rpm, hesitation /surge poor idle and poor cold start drivability. we are using factory vortec exh...
1998 Chevrolet Malibu LS 3.1L blleding system VIN: 1G1NE52M0W
car came to us with right front pads gone, had replaced front brakes one month, 3000 miles ago. we have replaced pads, rotors, both front calipers. afterwards, we lost brake pedal, so replaced master cylinder. we have dealership bleeding proceedure on hand, ho...
1999 Chevrolet K1500 Suburban 5.7L Misfire, MIL Lamp on, P0300 VIN: 3GNFK16R2X
I need some help thinking outside the box here. This is my personal vehicle so I have some latitude here...This truck has been driving me nuts for tens of thousands of miles. This problem can be duplicated repeatedly under these conditions. A long slow grade (... Trouble codes: P0300 (random misfire)
1999 Chevrolet K1500 Suburban 5.7L Belt VIN: 3GNFK16R5X
I have installed a new belt and tensioner and idler pulley and water pump twice. Two days after replacing belt each time belt squeaks or chirps. Pulleys appear to have no abnormal wear. Any help would be appreciated on this one.
2002 Chevrolet Silverado 1500 4.8L No Start VIN: 2GCEK19V6X
pick side of fuel pump relay keeps blowing the ecm driver circuit, this truck has had three ecm replaced due to no power output to the fuel pump relay, it will last approx three months each time before it blows circuit, this is not!!! the fuel pump side of the...
2000 GMC C3500 HD 7.4L Poor Idle Quality VIN: 1GBKC34J5Y
customer complains of extended crank time. we did major tune and fuel pump. long crank and slight rough idle still present. sent to local dealer, they said replace regulator and so i did. still there. found tsb on crank sensor, tried that too, still there. tru...
2005 GMC Sierra 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GTEK19B35
customer came in with rough idle. scanned computer and found code po300-random cylinder misfire checked and replaced spark plug on #5 due to almost all misfires recording on that cylinder. removed fuel rails and cleaned injectors and performed motorvac as we h... Trouble codes: P0300 (random cylinder misfire)
1998 Oldsmobile Aurora 4.0L climate control system VIN: 1G3GR62C7W
hey fellow techs, i have this 1998 olds aurora with electronic climate control. i unfortunately do not have a tech 1 scanner to test this system. my snap-on scanner and genysis scan tool are not able to scan the hvac for codes on that year. the problem is the ...
2001 Oldsmobile Silhouette Premiere 3.4L MIL Lamp on VIN: 1GHDX03E71
customer drove vehicle to my shop. runs fine,but has mil light on. customer states has been at another shop for a week and they replaced the ecm 3 times trying to fix a code po1336. i scanned the vehicle and code was current and stored. cleared code and start... Trouble codes: P1336
1995 Pontiac Firebird Formula 5.7L Hesitation VIN: 2G2FV22P2S
hello fellow techs. i have this vehicle when in the shop or on the road, just off idle , about 1050 rpm, power braking when in the shop ofcourse, the egr will go full 100% and engine will start to run rough. if held there and hose is disconnected on egr and pl...
2001 Pontiac Sunfire SE 2.2L clutch engagement VIN: 1G2JB52421
Vehicle has A/C inop. Pull the A/C relay and have both twelve volt signals. Grounded PCM side of relay and system runs. With the Genisys I monitored presure sensor and had gauges on. They both mirrored each other. Code 530 was only a history code and has since...
2003 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NG52E93
This car will not start when interior of car is hot for the sun. In the garage or during cooler days there isn,t a problem. I can duplicate by running the heater then car will not start till windows are left open to cool car. Thanks in advance Joe

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: Y7TU298849
car was taken back to were head g.s was replaced and they found timing gear 180 degree out. so this proves that if module does not see cam signal at the right time it will not send signal to ecm . also want to thank scott hager Trouble codes: P0340.
2000 Cadillac Catera 3.0L Poor Idle Quality, Cuts out VIN: W06VR54R2Y
it was the maf sensor. thanks to robert ny gary ky michael ca and thomas nh who may have had a similar problem. there were no abnormal readings to indicate a bad sensor, but after installing a new one it runs great upon start up and after. i still can't believ...
2004 Cadillac SRX 3.6L Poor Idle Quality, MIL Lamp on VIN: 1GYDE63764
Hi Crew, Adding 3.5 quarts of engine oil fixed this unit. Total engine capacity is 5.6 qts. Had no 'low oil pressure' warning lights. In retrospect, rapid and widely varying cam timing numbers on scanner for all cams, and rattle from engine on hard stops, th... Trouble codes: P0341 (intake cam position sensor - bank 1).
1996 Chevrolet K1500 Cheyenne 5.0L MIL Lamp on VIN: 2GCEK19M6T
The customer hasn't returned with this vehicle to perform more diagnosis yet. she called & made an appointment, but didn't show. We got some good responses on things to check, including checking for aftermarket accessories wired into the ecm wiring, disconnect...
1998 Chevrolet K3500 Cheyenne 7.4L Misfire, MIL Lamp on VIN: 1GCHK33J7W
Most of the replies I received go along with what I was leaning towards. I unfortunately was not able to continue testing to determine 100% that it had a leaking head gasket. I would definitely pressure test the system warm and pull the spark plugs to check fo...
1997 GMC Savana 2500 5.7L Poor Idle Quality VIN: 1GTGG25R5V
Thanks to all that replied, we did 2 smoke test , pcv valve test ect -many hours - we finally took off top intake and installed new gasket . did not help. , we had a pound of vacuam in crankcase dipstick tube so we finally took off lower intake mainfold and in... Trouble codes: P0507.
2001 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW52E11
I'm calling this Pont. fixed. One suggested possibly it was a bad range selector switch. That was not the case here. I mentioned a B2600 code. Although this code is not listed anywhere and it is undocumented on my Modis, other searches came up with daytime run... Trouble codes: B2600 (Undocumented code).
2002 Pontiac Montana 3.4L Engine VIN: 1GMDX03E92
Sorry I have been so slow to close this post. Since the customer is driving the vehicle for work, I have been unable to schedule it in for the amount of time required to repair this engine. I will summarize the responses. Most of them point to either a bad pis...
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