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Prev Professional Automotive Repair Technical Discussions for May 16, 2006
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Open Help Requests for GM
Help Request Answers
1990 Buick Skylark 3.3L Surge, Stall, Long Crank Time VIN: 1GYNM1YN0L
Hello all, thanks for any help in advance. I'm going to try to be as descriptive as possible so please forgive the long post. Problem 1. When starting engine cold(below 50 deg)engine starts with no problems. If I start right after I turn off, it will start...
1991 Buick Park Avenue 3.8L Excessive Emissions, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1G4CW53L8M
Hello techs this is a best friends car! His first complant was the car would not accelerate. Then it would not start! when it was towed over it was hard to start and when I drove it. It started out in third gear and ideled very high. scanner showed coolant -39... Trouble codes: 15 (coolant), 16 (batery volts), 21 (tps), 23 (air temp), 58 (anti theft system), 68 (cruise system fault)
1995 Buick Century Custom 3.1L MIL Lamp on
Good morning. I have this century belonging to an older gentleman that sets an EGR code P1405 solenoid 3 failure. The car runs great, no detonation. With a voltmeter on pin C in the EGR valve, I can watch the computer turing on the solenoid during normal drivi... Trouble codes: P1405 (EGR solenoid 3 failure)
2002 Buick Rendezvous CXL 3.4L battery VIN: 3GBDB03E42
Hello everyone, i need some help here, this vehicle has a parasitic draw that seems to be evading me. it's seems to be related to fuse 48 in the underhood fuse block, that fuse feeds a few fuses in the center console fuse block. I've checked almost all of them...
1995 Cadillac DeVille 4.9L Poor Idle Quality VIN: 1G6KD52B2S
customer stated throttle was stuck,shut off and had towed in,tow truck driver sprayed wd40 on throttle cable,problem will not reoccur,looking for way to manually test isc motor and tests for idle switch,cables are fine ,no frays or restrictions,if intermittant...
1996 Cadillac Seville SLS 4.6L head lights VIN: 1G6KS52Y8T
I scaned for body control modual vehical dose not suport it cheked all the fuses relays and evey thing is in place
1998 Cadillac DeVille 4.6L blend door VIN: 1G6KD54Y8W
hello, have a duel hvac system ,blend door not operating for drivers side, new blend door actuator installed.still no movement.have power and ref. at acuator.programer ok.no codes,no binding of door.thanks for help
1967 Chevrolet Corvette 427CID Cuts out, Misfire VIN: 194377S117
I have been having a problem with this car Breaking Down. The car idles fine and under a mild load it runs OK but under a heavy load it breaks down. this happens about 3800 rpm. I'm thinking that the 2 2bbls are not kicking in but it's been raining for eight d...
1985 Chevrolet El Camino 4.3L temp gauge VIN: 3GCCW80Z6F
Hi Everyone, the temp gauge in this car stays at the bottom all the time, key off or key on. My Mitchell diagram shows a seperate 1 wire temp switch for the gauge. I found a 2 wire sensor for the ecm located next to the thermostat housing. My component locator...
1994 Chevrolet Camaro 3.4L Poor Idle Quality VIN: 2G1FP22S7R
Vehicle came in back in August 2005 for a significant amount of work ranging from the driveability concern to power door locks and a coolant flush. Customer complained of rough idle. Diagnosis at that time seemed to point to bad wires. After removing and re-ga... Trouble codes: 77 (Digital EGR Solenoid 3 Error)
1996 Chevrolet C1500 Cheyenne 5.0L MIL Lamp on VIN: 1GCEC19MXT
Students are working on a vehicle that failed an OBDII emission test. The P1406A Code sets consistently. Like an EEC IV Ford, the EGR position sensor reports open at idle. The EGR Valve has been replaced to no effect. Key on engine off we show .88 volt (both... Trouble codes: P1406
1999 Chevrolet Silverado 1500 4.8L heater core VIN: 1GCEC14V5X
installed water pump 3 weeks ago because of leaking. customer came back last week complaining of noise coming from inside the cab upon accerlation(2000rpm) noise is coming from the heater core area. lines pinched off noise goes away. water pump was replaced ag...
2000 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC5241Y
Customer states that while driving multiple indicators will light, including CEL and theft, at random. 13 different failure codes are stored in 5 modules, with another 8 stored as duplicates. Many are U10xx. Remainder are PCM U1301, P1626, ABS C1254, C1295, BC... Trouble codes: U1000 (Communication), U1016 (Communication), U1040 (Communication), U1064 (Communication), U1088 (Communication), U1096 (Communication)
2000 Chevrolet Silverado 1500 5.3L engine VIN: 2GCEK19T8Y
this engine has a knock/scrapping noise in the engine. we've had the belts off. the noise is always there and it is noisy at idle and louder at 1000 rpm. it turns into a kindof lifter noise at higher speeds. we've pulled the flywheel inspection cover and check...
2001 Chevrolet Express 3500 5.7L turn signals VIN: 1GCHG35R31
hello everyone, we have a fleet of 2001 and 2002 chevy g3500 express vans that 2 of the vans turn signals flash faster then normal. we replaced turn signal flasher and turn signal switch - still the same. we replaced all turn signal bulbs and check all sockets...
2002 Chevrolet Avalanche 1500 5.3L Stall, Misfire VIN: 3GNEK13T22
Truck originally came to me last october with no start condition and bad fuel pump. Replaced pump and filter, cleaned throttle body for maintenance, and all was good. Then customer called me a few days later and was experiencing stalling when releases throttle...
2002 Chevrolet Silverado 2500 HD 8.1L Engine noise VIN: 1GCHK23GX2
Greetings to all This noise is driving our customer crazy. The noise is a chirping noise coming from engine compartment. Noise is only present under heavy acceleration or if customer is pulling a trailer up a grade with moderate acceleration. It seemed to us ...
2003 Chevrolet Silverado 1500 4.8L Noise VIN: 2GCEC19V33
Hello all. This is my personal vehicle. I just noticed the other day 2 very distinct and different interior rattles. I have taken the instrument panel upper and lower trim panels off and driven it and still can not pinpoint where the noises are coming from. Th...
1993 Geo Tracker 1.6L driveshaft VIN: 2CNBE18U9P
Hello all this car has a very noticeable vibration-growl starting at about 45 mph up to about62 mph,before or after these speeds is barely noticable.There appears to be a noticable amount of play at driveshaft slipyoke where it enters transmission,can move it ...
2001 Oldsmobile Alero GX 2.4L No crank VIN: 1G3NK12T01
Hi Techs, I'm looking for some help with this Olds. Every moring when the air temp. is cool the car will not crank. The dash lights come on however it won't crank. If we let the car sit untill the air temp. gets hotter(75 to 80 degrees) the car will start and...
1950 Other GM pick up 240CID gauges
We started the convertion installing an Alt and changing all the lights bulbs, repairing wiring. We got stuck with the gauges which we need to use the 6v system. My Q is more of an information type. What ohm resistors should we use to drop the voltage in half ...
2004 Pontiac Grand Prix GT1 3.8L Poor Idle Quality, Stall VIN: 2G2WP52284
fellow techs, We have two of these 04 pontiac grand prixs with 3800 series three engines. Both customers are complaining intermittent start and stalls. The engine will crank fine and act like it starts and then shut back off. Customers state that sometimes the...
2002 Saturn SL 1.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G8ZF54812
Okay, this one has me a little puzzled. Car came in for no start condition. Replaced positive battery cable bolt, cleaned cables, and the car started up. Upon running the vehicle, the engine seemed to have a miss, and the idle was too high about 1500-2000 rpm ... Trouble codes: P0301 (Cylinder 1 misfire detected), P0507 (Idle Control System-RPM too high)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Park Avenue 3.8L Brakes VIN: 1G4CW53LP1
Fix was to make many quick slow downs from 50 - 20 mph at distances to allow cooling periods, to reseat linings, also some stops in reverse to allow rear adjusters to fully reset. Some did not read all, as machining was done at several cuts and at slowest spee...
1994 Buick Roadmaster 5.7L Surge, Poor Fuel Economy VIN: 1G4BN52P4R
we think we have this one fixed, we changed the PCV valve to fix the iac low counts of 0. We also found that the surging problem only happened after car was good and hot, we ended up replacing the coil to fix this problem and we have not heard from the custome...
1995 Buick LeSabre Limited 3.8L Stall VIN: 1G4HR52L6S
Thanks for all the replies. After replacing the ECU the vehicle runs great no more stall or studder. All the gauges work normally. As soon as old ECU put back in same old problem. So Installed New, Customer happy and problem solved.
1984 Cadillac Seville 4.1L Low pedal VIN: 1G6AS6987E
As David said I kept getting air out of the R/R caliper, replaced it again an problem gone.
1995 Chevrolet Corsica 3.1L No Start, Poor Idle Quality VIN: 1G1LD55M4S
This Corsica was a true odd ball. After reading all the replys I went and ohmed each injector back at the ECM. All injectors were 12 ohms, so no issue there. I thought about it and I decided to just check my power at my injectors where they are all spliced tog...
1995 Chevrolet K2500 6.5L Stall VIN: 1GCGK29F9S
It's been a while and it looks like the oil pressure sender is the cure. Interesting, but I thought the relay worked in parallel with the sender full time. A second look shows the relay only energizes during crank. Lesson learned!
1997 Chevrolet Express 1500 5.7L MIL Lamp on VIN: 1GBFG15R8V
sorry it took so long to close wanted to be sure it was repaired, the problem ended up being the charcoal canister, it was saturated with gas not alowing the system to breath. the evap system was plugged up, cleaned system and replaced canister, and so far all... Trouble codes: P1441 (evap system flow during non purge).
2000 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1ND52J2Y
Thanks for all the help with this one guys, changing the ignition switch took care of most of the problems, I checked my local dealer about a reflash for the 1404 egr code & there was not one for this vehicle, cleaned egr & passage way & my monitors set with n... Trouble codes: 135 (02 heater sensor 1), 141 (02 heater sensor 2), 443 (evap purge control), 443 (evap purge control), 463 (fuel level sensor low), 719 (tcc brake sw signal low).
2000 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDX03E1Y
Well Scott you were right it was the mass air sensor. Shinny on one side black on the other. Test drove after cleaning and saw 110 gps of air. I guess going to open loop was not a factor at all. thanks for the help. Paul Trouble codes: P0131, P00, 137 (sensor 12 low voltage).
2001 Chevrolet Malibu 3.1L 4T40e transmission VIN: 1G1ND52J31
Thanks to everyone who took the time to reply to this help request. I had some really good replies, Andrew and Ryan hit the nail on the head though. We tackled the IAT codes first and sure enough found the wires broken at the connector. Got a new pigtail and c...
1991 GMC Safari SLE 4.3L Stall VIN: 1GKDM19Z8M
Thank you for the help. I had 10 replys and most said distributor or pick-up coil. I replaced the pick-up coil and the stalling problem is 90% better. I am still going to try and find an OE GM distributor and get rid of the aftermarket one. In the future I wou...
2002 GMC C8500 7.2L Excessive Emissions VIN: 1GDP7H1C72
Thanks to Roger and Virgil for your input. I had a feeling that I would need a scan tool to diagnos and Roger confirmed that. I took Virgil's advice and contacted our Cat dealer to see if the vehicle was still under warranty. Unfortunately it is not, sent it t...
1993 Pontiac Grand Prix SE 3.1L front suspension VIN: 1G2WH5420T
Thank you for all the quick responses. The problem may have been caused by another shop repairing suspension parts and not torquing to specifications, actually over-torquing, the lower control arms, which did not allow the pivoting motion as needed, causing th...
1997 Pontiac Grand Prix GTP 3.8L No Start VIN: 1G2WP5216V
All your replies were great. It turn out to be the ignition switch as most of you suggested. After studing the wiring drawings. I took Charles suggestion I made up a test light using a motorcycle headlight and did a voltage drop test on the Ign-1 circuit and n...
1999 Pontiac Grand Am GT 3.4L slow initial start VIN: 1G2NW52E9X
Thanks fpr all the replies! Most of you said it was the fuel pressure regulator. I ended up selling the car as it was. Funny thing is the person who i sold the car to had the same problem with their car and was'nt bothered by it.
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