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Prev Professional Automotive Repair Technical Discussions for May 3, 2004
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Open Help Requests for GM
Help Request Answers
1999 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K1X
this car would go nuts when we first got it. on the test drive it would buck, surge, trailerhitch, fishbite, chuggle, and everything else -- consistantly intermittant. We scoped the maf, and had good power, and ground. the signal output or frequency output was... Trouble codes: P0102 (Maf sensor malfuntion-Logs within 15 to 30 miles), P0401 (EGR flow insuffient-), P0446 (Evap code)
2001 Buick Century Custom 3.1L Starting VIN: 2G4WS52J41
We have a 2001 Buick Centy-that will not start. We have check every thing.We omi the chip in the key it omi 6.02 K omi. We omi the 2 white wires at base of key lock & cyl. Omi the same even in crank position. Have check the crank voltage off of the ign. & also...
1990 Cadillac DeVille 4.5L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G6CD533XL
This vehicle came in with the customer complaining of the engine cutting out under load.It actually hardly ran on test drive stalling after missing badly under load. Spark was good on scope but the injector pulse was erratic and then nonexistant. Code 41 lead ... Trouble codes: 41 (No reference pulses to ECM)
1991 Cadillac Seville 4.9L Mechanical VIN: 1G6KS53B4M
I have this cad, the problem is it won't go into gear. If you rock the vehicle back and forth and the gear selector is in drive it goes into gear and you can drive it. All gears shift normal, until you stop vehicle, put into park or neutral and then shift sele...
1992 Cadillac DeVille 4.9L compressor clutch VIN: 1G6CD52B6N
Please read repair history first. Vehicle is back in again same problem,A/C doesn't work,transmission in limp mode, fuse 5 blown. Did not check amp draw but have a coil resistance of .7 ohm which tells me high amp draw. I am really getting tired of changing th...
1998 Cadillac DeVille 4.6L compressor VIN: 1G6KD54Y2W
The Compressor will remain engaged all the time regardless if the controller is in econ mode, a/c mode or off. The only way to have the compressor disengaged is to put the system in econ mode, turn the engine off and restart it. If the engine is running and a/...
1995 Chevrolet K2500 Cheyenne 5.7L Air Doors VIN: 1GCFK29K4S
Hi Techs: This is not my area of expertise. This is a friend of mine so I said I would look at it. Problem being air flow only at floor vents. I remember reading many posts about air doors inop. I have not seen truck yet. Doing this on my own time. I am just h...
1995 Chevrolet G30 Beauville 5.7L Surge, NO POWER VIN: 1GAFG35K1S
Hi every one, the owner brought this bus to me (its has many seats as it carries passengers) with the complaint that it has no power and is surging. I tested the vehicle and confirmed the power loss which felt like serious gas starvation excepting that it does...
1997 Chevrolet Lumina 3.1L abs VIN: 2G1WL52MXV
We have tried the Identifix repair related to this problem (which is checking for corrosion at the underhood electrical center #2, found corrosion and cleaned it, but it did not solve the problem) Abs voltage after a few minutes of driving drops to about 2 vol...
1998 Chevrolet K2500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1GCGK24R4W
This truck only acts up after fully warm and acts like a lean miss at cruise and idle (in gear and/or park). The fuel trims show commanding for more fuel eventhough o2s are both high. AT WOT no miss is detected and the missfire counters are always at 0. If ind...
1999 Chevrolet Silverado 1500 4.8L fuel gauge and sender VIN: 2GCEC19V5X
Hi fellow iatn members. Hoping one of you techs can help me with this repair. Dash "Low fuel warning" light on in the message center and with scanner shows p0463. Using trouble tree to diagnose it leads to replacement of the sender inside the tank. Problem is...
1999 Chevrolet Malibu 2.4L A/C control head/compressor VIN: 1G1ND52T9X
Since replacement of A/C head, A/C has worked flawlessly. Local temps up to the low 100's this week. Noticed at a stop light that the green light indicating that the a/c is on blinks intermittently. When the light goes out, the vent temp goes ambient. When the...
1990 GMC C1500 Sierra 5.7L Poor Idle Quality, Hesitation
Customer's only complaint is a hesitation and runs rough only after a hot soak of approx 20 minutes. I found that fuel pressure would drop to zero after only 90 seconds. I checked fuel pressure at the outlet of the fuel filter, with a "T", so I could have the ...
1997 GMC C1500 Sierra GT 4.3L Surge, Misfire, MIL Lamp on VIN: 1GTEC14W9V
This vehicle has been in for repairs numerous times with us and at another location. our first chance to look at this vehicle was for a no start condition. upon initial inspection the spark plugs and ignition wires had been replaced at another location. after ... Trouble codes: P0300 (random misfire detected)

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue Ultra 3.8L Stall, MIL Lamp on VIN: 1G4CU5213V
Sorry for the long wait,but we wanted to give the car a couple of weeks to make sure the problem was fixed.I want to thank all the people who replied there were alot of great ideas.Allen [...] got it right on this one, they said to check th... Trouble codes: P0101 (maf system performance).
1998 Buick LeSabre Limited 3.8L heater control VIN: 1G4HR52KXW
Hi,we received some good info , most of the replies mentioned a TSB about disconnecting the battery for 3-5 minutes and the display should change to farenheit. We tried that several times with no luck. The customer is going to try the local dealer.If I find ou...
2001 Buick Century Custom 3.1L valvetrain VIN: 2G4WS52J61
Based on the responses I have received from members here at iATN, I went ahead and disassembled the engine to inspect for problems with the pistons. Found #4 piston skirt scuffed very bad. YOU GUYS RULE!! I would have never thought that this noise was a piston...
1986 Chevrolet S10 2.5L No Start VIN: 1GCBS14E2G
The old S10 is FIXED! I had a hunch there had to be a seperate starting circuit from a run circuit but I could never find schematics for this truck. So when I got my first E-mail reply from Robert from NC, he confirmed my theory. One time I lost my spark, I ha...
1989 Chevrolet S10 2.5L Poor Idle Quality VIN: 1GCBS14EXK
I would first like to thank everyone who responded to my post.Everyone tips were excellent i tryed everyones suggestions tbi cleanings iac check worn throttle shaft etc but it turned out that the base gasket on the tbi was so bad it must of been sucking in air...
1995 Chevrolet Caprice Classic 5.7L water pump drive shaft VIN: 1G1BL52P3S
Hello and thanks for the replies. Two were for seal issues; use special tool to install and try to install it backwards?! And one stating he just had one apart and said there is no play in shaft through timing cover, but he didnt know what held it centered. So...
1996 Chevrolet Lumina 3.1L idle too high cold VIN: 2G1WL52M7T
Hello friends I have fixed this car thanks to your help. I relaced the tps and the coolant temps sensor and the car behaves as it should. Thank you so much for your help. IATN is a God send for all us techs. Thanks again Mark
1999 Chevrolet Silverado 1500 5.3L door locks VIN: IGCEK19TOX
Got 4 replies,thankyou,but before I could test anything else the customer decided he did'nt want anything fixed on it.suggestions were check wiring in doorpost,actuator test procedures and related wiring.Thanks again.
2001 Chevrolet Camaro 3.8L Fog lights VIN: 2G1FP22K51
Did not fix this one customer could not wait any longer. Customer took car to another shop they could not fix either. Original problem was customer states switches get too hot to touch and fog lights would turn off and on as the fog light switch got hot and th...
1998 GMC Jimmy Envoy 4.3L Battery VIN: 1GKDT13W9W
Thanks to all, I put a battery in the Envoy. Two weeks and all is well. I found that it takes 20 minutes for the lamp module relay to shut down. After that I was at 15ma draw.
1995 Pontiac Grand Am SE 2.3L Temp Gauge VIN: 1G2NE55D65
Hi everyone. Sorry it took so long to write back. Almost everyone said heater core. I replaced it and sure enough the problem is fixed and the customer is happy. Thank you all who helped on this one. Craig
1996 Pontiac Bonneville SE 3.8L fuel pump/windows VIN: 1G2HX52K3T
Once again, you guys are the best. The problem was indeed the grounds right where you said they were! We reconnected and cleaned them and she's on the road again. Many thanks to all who responded, Keith.
1999 Pontiac Grand Prix SE 3.8L Rt side Electronic Acutator VIN: 1G2WP52KOX
Well I received 3 replies and appreciate the help. Let the customer have the vehicle with the actuator replaced and seems to be working fine. By setting my scope at 5v/500ms I was able to get a pattern on the motor drive ckt. Looks like a PWM pattern that vari...
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