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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 21, 2005
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Open Help Requests for GM
Help Request Answers
1996 Buick Regal Custom 3.8L Misfire, MIL Lamp on VIN: 2G4WB52K6T
Hello fellow GM techs. I have this car that came into my shop yesterday with the SES and miss. Scan test found random misfire on #5 cylinder. Tested firng and does miss on #5. Test injectors with both amp tester and balance tested injectors-good, tested spark ... Trouble codes: P0300
1996 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP52KXT
first time this car showed up on hook no start, found no fuel preasure. replaced fuel pump with after market , three weeks later on hook again, replaced with same manufacturer, never left shop, installed new ac delco pump, three weeks later on the hook again. ...
1998 Cadillac Seville SLS 4.6L Misfire, MIL Lamp on VIN: 1G6KS54Y1W
Hello All and thanks in advance for any help, I have found Iatn very helpful. I have this vehicle that has an ignition missfire on $1 cyl.(sorry no. sign key is bad). I have done what I think to be the preliminarys IE; swapped coils, comp. test, swapped inject... Trouble codes: P0301 (Cylinder 1 missfire), P0300 (Random missfire)
1977 Chevrolet Corvette 5.7L p/s pump VIN: 1737L7S416
This vette came in with the p/s bracket laying on the left frame. After inspecting found the 2 bolts that hold it to the front of the engine broken off. Found the other bolt that holds the bracket to the side of the block missing. Ordered new p/s bracket and d...
1999 Chevrolet Express 3500 5.7L Excessive Emissions, Poor Idle Quality, Stall, Misfire VIN: 1GCHG35R7X
every thing we've done has no effect on miss fire
2000 Chevrolet Silverado 1500 5.3L red brake warning light VIN: 2GCEC19T5Y
Red brake warning light is flashing at a consistent rate all the time with the key on and while the engine is running. I can't find any information for any kind of diagnostic procedure or what makes the light flash. I've checked ABS, BCM, and PCM codes, and t...
2000 Chevrolet Impala 3.4L starter VIN: 2G1WF55E6Y
Hello all, we have this Impala that int. will not start, will not crank. The customer discovered if she steps on the brake pedal it starts. You have to step the pedal just far enough for the brake lites to turn on. This is intermitant so we have not been able ...
2003 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire VIN: 1GCHC29U33
Got a strange one here. This 6.0 truck has a very rough idle and will even sometimes die. Missfires build up on all cylinders while idling but go away once you reach anything over 1400 rpm. The truck has plenty of power and drives fine off idle. We have repl... Trouble codes: P0300 (Random Missfire)
2003 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 2GTEC19T23
Truck came in running horrible. one of my techs looked at it for 2 hrs and gave up...it acts like a intake gasket leak or a stuck open egr valve, but has no egr valve. LT FUEL TRIM B1 11% & LT FUEL TRIM B2 -25%--misfires on cylinders 2,4,6,8---4 and 6 being co... Trouble codes: P0300 (random misfire), P0101 (maf out of range), P0756 (shift sol. b per. or stuck off)
1991 GMC TopKick 8.0L A/C Controller Module VIN: 1GDM71HJ1M
I have a real winner here. The LED's on the A/C controller flash and the system doesn't work.I'm just trying to get some heat and a little defrost for the driver. When you turn the ign. swithch on, about 10 sacs later the LED's for the dash mode start to flash...
1998 GMC Jimmy Envoy 4.3L HID Headlamps VIN: 1GKDT13W0W
This one is very confusing. With the headlamps on, the hi beam indicator stays on and I am unable to change it. I have tried a new combo switch with no change in operation. Alldata's wiring diagrams are very poor on this subject. There is no trouble shooting c...
2000 GMC C-Series Topkick C7H042 7.4L Cuts out, Stall VIN: 1GDJ7H1B1Y
Approx. 2 weeks ago we put a clutch in this truck, 2 days later it shows up having an intermittant stall/ hard to start issues. sometimes it can run for an hour and then suddenly loses power to the pumps. All data is of no use and we called the GM tech line wh...
2001 Oldsmobile Aurora 3.5L MIL Lamp on VIN: 1G3GR64H11
Car came in with a p0410, secondary air injection system, code just over 1 year ago. Tested and replaced one of the air diverter check valves. 9 months later it's back with a whining air pump on cold start up but no codes. Replaced with a new Delco air pump, c... Trouble codes: P0410
1997 Pontiac Sunfire SE 2.2L headlamps VIN: 1G2JB1245V
reviewed fix database and checked all related splices/ grounds. new switch will make lamps work properly for approximately 9-10 months. just looking for ideas/ feedback about anything missed or is this just a poor quality switch problem. switch that was instal...
2000 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HZ541Y4
vehile has stalled 3 x's on customer but not for me,at 70 mph and 30 mph and at stop sign, but has restarted everytime I have scoped the crank sensor, but checks out ok, Jim Trouble codes: P0128, P0137, P0336

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP53L2N
Thank you all for repling to this help request. The cust chose not to fix this car. Trouble codes: 41 (cam sensor fail).
1994 Chevrolet K3500 6.5L MIL Lamp on VIN: 1GBJK34F0R
thank all tecs who replied. we finally got this truck back. using all advice offered, removed and installed new strainer in fuel tank, inspected tank for contamination, good. road test and light came on as usually. installed new transfer pump, frame mount and ... Trouble codes: 36 (long m/s injector pulse).
1996 Chevrolet Blazer 4.3L Hesitation, Cuts out, excessive crank time VIN: 1GNDT13W3T
I want to thank you guys for the responses that i received, after reading the possible solutions to my problem it was obvious that most of you agreed that the problem was the fuel pump especially if the aftermarket pump was not oem. Well the pumps that were pr...
1997 Chevrolet Lumina 3.1L Poor Idle Quality, Misfire VIN: 2G1WL52M2V
we finally got hold of a vacuum transducer for our lab scope and hooked it up so we could watch the vacuum pulse for each cylinder. what an amazing tool. we can definetly see a problem on the intake stroke for #1 cylinder so we know it is a mechanical problem....
1999 Chevrolet Express 3500 LS 5.7L Power steering pump VIN: 1GAHG39R7X
Thanks to all who responded. I found the hose from the fill reservoir kinked down by the pump restricting flow. I tried to re-route the hose, but it seemed to long. I cut off about 3' of the hose by the pump and re-assembled. Works like a champ now!
2000 Chevrolet Silverado 1500 5.3L Heater VIN: 2GCEK19T7Y
Thanks to all who responded. Flushing the heater core took care of the problem. Truck has been gone several weeks now and no complaints.
2002 Chevrolet Venture LS 3.4L Speedo, Driver Info Center, Odometer VIN: 1GNDX13E62
I thank the 3 guys who replied; Doug, Mike, and Tony. I appreciate your input. After hooking up my new Tech 2 I discovered The instrument cluster was the only module not communicating. After doing a thorough wire check I disassembled the instrument cluster to ...
2002 Chevrolet Silverado 1500 4.3L distributor VIN: 1GCEC14W62
well engine was not replaced thanks to a money hungry warranty co in the southern partof the auto nation where its sandy and sunny cust was aware aof circustances dist recall has been performed as you all well know was put out by gm months ago thanx for the fe...
2005 Chevrolet Silverado 1500 5.3L intermediate steering shaft VIN: 2GCEC19T65
Hello, well I haven'thad much luck on this fix with my 3 gm techs. They have read thru the fixes and all don't want to pay attention to the crossmember bulletin. They seem to be content just replacing grease packs as long they are in warranty. Thanks to Jorge,...
1989 Oldsmobile 98 Regency 3.8L Cuts out, Stall VIN: 1G3CX54C1K
This was my first help request, and the replies were great and extremely helpful; thank you. I ended up replacing the MAF, TPS and the Crank Sensor again. All of which made the car run better. I removed the factory spark plug metal protection sleeves and that ...
1999 Oldsmobile Intrigue GL 3.8L unknown VIN: K5XF304903
Found the cause of the water noise was the heater core. Flushed the cooling system and evacuated any present air pockets. Thank you all for your help.
2001 Oldsmobile Aurora 3.5L MIL Lamp on, Evaporative System VIN: 1G3GR64H61
Many thanks to everyone that tried to help. Although this customer insisted they wanted to fix this car, they have not rescheduled. I'm closing this as a 'not fixed'. If they do reschedule, I will certainly update this post. Trouble codes: P0440 (Evaporative System Fault large leak detected).
1990 Pontiac Bonneville SE 3.8L drums VIN: 1G2HZ54CL1
the vehicle quit making the noise, so I have nothing to go on
1998 Pontiac Firebird 3.8L heater VIN: 2G2FS22K1W
Thanks To All who replied.I received some excellent advice on the fix for this car. Customer never returned for me to try any.
2001 Pontiac Sunfire GT 2.4L No Start, Cuts out, Stall VIN: 3G2JD12T11
replaced ign switch CLIENT HAS NOT BEEN BACK YET.all is well thanks for all the great support guys
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