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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 13, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue 3.8L charging system VIN: 1G4CW53L6M
replaced clutch and compressor w/used one ( a/c clutch was fried along w/bearings.) trouble is that the charging system is down and we only see battery voltages, alt. went to local gen. shop and was tested good. bulb test good, looked at the wiring, fuses, etc...
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M7T
After performing the normal checks E.G.R. valve was excersised using snap on scanner, and engine idle quality changed sufficently to be acceptable. M.A.P. sensor and mechanical vacuum gauge recorded similar readings in responce to E.G.R. opening. When vehicle ... Trouble codes: P0401
2002 Cadillac Seville STS 4.6L Unknown VIN: 1G6KY54992
hi vehicle will start & run shift ok. but when turnig of vehicle key will only go back as far as acc.key can't be removed.have pulled ignition lock cylinder out & tested is ok.qustion is the switch the problem or can somthing else keep key from being removed. ...
1989 Chevrolet G20 Chevy Van 5.7L Hesitation, Cuts out, Stall VIN: 1GBEG25K6K
egr valve seems to open prematurely just off idle in neutral causing stumble , what controls this egr systems opening if we diconnect the vacuum to egr it runs fine Trouble codes: 13 (o2 sensor), 33 (map sensor signal high), 44 (lean exhaust)
1995 Chevrolet K1500 5.7L Unknown VIN: 1GCEK14H85
weird one. truck was bought from wholesaler, truck came in with a/c inop. last dealer replaced condenser, flushed system etc. i get it high side pressure through the roof, 450 psi plus intill compressor shuts off. checked orfice tube in condenser, found it dam...
1996 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, MIL Lamp on, Transmission slips VIN: 2GCEC19R5T
We replaced the intake gasket for a coolant leak. Reinstalled everything and resynced Cam and crank together by procedures. Test drove home over night and returned to customer with no problem. 2 days afterwards came back to shop with Mil Lamp on with codes p01... Trouble codes: P0108 (MAP Sensor Circuit too high), P1106
1997 Chevrolet C1500 4.3L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1GCEK14WOU
thanks for reading, this truck only acts up after geeting hot, the motor stumbles and rpm wont go above 4300. stop and restart and everything is ok untill next episode, could be 2 miles or 200. when truck acts up and you stay in the throttle the ses lamp comes... Trouble codes: P0131, P0151
1998 Chevrolet Blazer 4.3L Transfer Case VIN: 1GNDT13W1W
Customer Complant is engages in 4wd by its self.more likely to happen when its under load like pulling a hill.when this occurs the lamp on the 4wd button will light up .she pulls to the side and stop pushes the 2wd button and with some trouble can get it back ...
2000 Chevrolet Suburban 1500 LT 5.3L compressor belt VIN: 3GNEC16T1Y
This one has me a little baffled. Vehicle came in with ac tensioner vibrating violently from stop to stop when accelerating with ac on. The tensioner felt very weak(as do the new ones) , but this one felt especially weak. Belt also worn out. New belt and tensi...
2002 Chevrolet Impala 3.4L performance VIN: 2G1WF55E12
No guts No glory. Her name is Gloria and this thing has no guts. Top end is about 70 mph. Driving along at 45 mph. stomp on it, trans. downshifts, engine rev's, but lacks putting you in the back seat. She took it to the dealer, they found nothing. Had several ...
1994 GMC Jimmy 4.3L No Start VIN: 1GKCS13W2S
hello there!i have this weird problem ,and it happens only when the engine is cold. usually in the mornning,when i want to start the car,the engine cranks, but it won't start. i pulled out a spark plug wire to chek for spark, and when i cranked again,the car s...
1987 Oldsmobile Calais 2.5L Exchaust Valve
Four months ago had # 3 exchaust valve replaced for being bent and not seating,valve was not bent from hitting piston.Came back with popping noise. Removed valve cover and found # 3 rocker arm seating off the side of the valve, push rod bent and push rod guide...
1992 Pontiac Trans Sport 3.8L No Start VIN: 1GMDUO6L4N
Hello all this van is making me pull my hair out. Came in no start, went through the no start chart came up with bad module . But it also had a code 42 that would come up right away , so i did this code chart also and it too said module. Double checked crank s... Trouble codes: 42 (est problem)
1999 Pontiac Grand Prix SE 3.8L MIL Lamp on VIN: 1G2WJ52K4X
This car has a P0300 code. No problems are felt from the seat or looking at the motor. The ignition module has been replaced. With the Tech 2 and using the Misfire graphic cyl 3 & 6 are causing the problem. I did a power balance and all 6 dropped roughly the s... Trouble codes: P0300 (Random Misfire)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Chevrolet motorhome 454CID p/s pump VIN: 1GBKP37N33
will try lowering the pressure hose and letting vehicle sit longer between test runs. nothing else seems to be making a difference. I wish it could talk, I think there is more to the story then customer is telling.
1993 Chevrolet S10 Blazer Tahoe 4.3L Cuts out, Stall VIN: 1GNDT13W1P
Thanks to everyone for all the help.All the people who offered advice pointed to either the fuel pump, or the injector assemble.After many conversations with the vehicle owner, he let us replace the injector assemble and that cured the stalling problem.Thanks ...
1998 Chevrolet C1500 Suburban 5.7L Dual ac system VIN: 3GNEC16RWG
Good Morning, First my apologies for not giving more details regarding the ac on the suburban, such as exact temperature and pressures. Other items that were metioned in the replies were obvious, such as blocking of heater, diverter and recirc. doors and pushe...
1999 Chevrolet Tahoe LS 5.7L No Start, Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GNEK13R9X
Hi all, this one got away. The customer has an extended warranty and I could not get approval for repair I felt this truck needed. Most responses suggested poppet valves sticking and I feel as if that is what is wrong with this Tahoe. I suggested replacing pop... Trouble codes: P0300.
2001 Chevrolet Suburban 1500 5.3L compressor VIN: 3GNFK16T11
Thanks for all the responses guys. Pretty much everyone had the same fix, and here it is. GM has been having this issue for quite some time on this system. TSB# 01-01-39-002B. This covers models 2000-2001 Cehvy & GM C/K Utility models with dual air built prior...
1998 GMC Safari SLE 4.3L No Start VIN: 1GKEL19W2W
After many attempts still I came to the conclusion that the VCM was bad. I belive the drivers were at fault.I triple checked all my work and diagnostic steps. After talking with GM the VCM is fairly cheap 187.00 i think it was, had it towed to GM to program th...
1998 GMC K3500 Sierra SL 6.5L Stall VIN: 1GDJK34F6W
Thankyou for the help on this one,as most of you suggested,the fuel transfer module and relay was the fix,at least as far as I know the problem is solved since I have'nt heard back from the customer.Results were hard to gage immediately,because I had already t...
1997 Oldsmobile Achieva S 2.4L Cuts out VIN: 1G3NL52T7V
Thank you for all of your help. Mark thank you for hooking us up with Ray, what a great person. We ended up sending the car to A GM Dealer. It turned out to be a short in the wire under the hood @ 12' from the fuse box going back to the ing. switch. They fixed...
1993 Pontiac Grand Am SE 3.3L evaporator VIN: 1G2NE54N8P
Sorry for the delay, but wanted to see if it remained fixed. I had a lot of good replies mostly blaming a bad heater core install.They said mechanics break or crack the heater box and then water from the air conditioner will leak into the cabin. This may sound...
1997 Pontiac Sunfire SE 2.2L Detonation (pinging) VIN: 1G2JB1240V
Thanks for all the responses, they were all very helpful. I recieved a couple about the coolant temperature, I should have included in my original help request that the temperature is ok. When I first talked to the customer, he told me it was pinging before he...
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