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Prev Professional Automotive Repair Technical Discussions for March 8, 2010
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Open Help Requests for GM
Help Request Answers
1996 Buick Riviera 3.8L No Start VIN: 1G4GD2217S
OK techs I have been fighting this problem for days now we have a customers 1996 buick riviera 3.8 super charged.The engine was replaced with a new one at 113829 miles. We have replaced the ecm all the coil packs, crank sensor we tested the cam sensor it teste... Trouble codes: P0640
1999 Buick Park Avenue Ultra 3.8L Serpentine belt VIN: 78YTRRRREE
This is a very rudimentary question so i'd like some wide opinions please. When removing the serpentine belt for the Alternator, which is the most effective way of doing so??? I have dabbled with the engine mount removal/loosening which is quite the chour to...
2001 Buick LeSabre Limited 3.8L HVAC Display Milage display VIN: 1G4HPS4KS1
This Buick lasaber limited. The HVAC disply is not working the only thing showiong on it lower bottom right fc and none of the buttons are lite. the compressor is running and the fan is running on medeum also the mileage is blank also. once with the key on and...
2003 Buick Park Avenue 3.8L turn signal VIN: 1G4CW54K63
this car came in with the left turn light on front, rear, and in mirror. this occures always with or without car running, with key in or out of ignition. i can pull the #25 fuse out of fuse box under hood and lights go out. the right turn signal works fine, th...
1990 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1GCDC14K3L
Owner states for this visit, when driving into parking lot, experienced power loss like no-fuel. Power returned but engine felt as if missing. During 5 mile drive home, truck ran poorly. At home engine had to be restarted a few times due to stall. Once when re...
1999 Chevrolet Astro 4.3L Starting VIN: 1GNDM19W7X
Help, customer complaint of a long crank with no start two or three atempts. than starts. checked fuel, spark, wireing, and PIDs. every thing okay. Security light on while running and start up but no codes, and will go away at random. we cannot get the van to ...
2003 Chevrolet Silverado 1500 LS 4.8L vibration VIN: 1GCEK14V73
clutch seems to be good but have a vibration that increases with freq and amplitude, if deppress clutch at 50 mph and coast vibration gets worse, also evident under load, etc up hills, any and all help would be nice, any suggestions, thanks.
2004 Chevrolet Avalanche 1500 5.3L Excessive Emissions, No Start, Misfire VIN: 3GNEK12T14
This vehicle was sent to me by a transmission shop that we work with quite a bit. It was brought to them for a random misfire concern which grew bad enough while with them that it wouldn't stay running. Scanned P0300 dtc. Pulled spark plugs and found them soak... Trouble codes: P0300 (testing and results)
2004 Chevrolet Classic 2.2L T.Chain tensioner VIN: 1G1ND52F24
Replacing my first updated timing chain tensioner on this 2.2 and can not understand how to release it after in is installed. I have Alldata which tells me to use a rubber tip tool and give the chain a sharp jolt diagonally downwards to release. I have done th...
2005 Chevrolet Silverado 2500 HD 6.0L Temperature control VIN: 1GCHK23U45
Vehicle came in with a somewhat unique problem being the fact that the climate control (DUAL-ZONE Automatic) will not adjust the temperature on either side correctly. Ie. temperature on display shows 71 degrees and customer desires 78 degrees, the command is ...
2006 Chevrolet C5500 Kodiak C5C044 8.1L Cuts out, MIL Lamp on VIN: 1GBEC1G16F
thanks in advance. i have not realy looked at this truck in depth yet. just looking for some info.. codes 2135 and 1516 are current codes.. the truck will go into "reduced power" mode when problem occurs... i have checked the throttle body connector for moistu... Trouble codes: P2135, P1516
1994 GMC Jimmy 4.3L Lighting VIN: 1HJKJHGTYU
Looking for 'turn signal flasher! Mitchell sayes it's in fuse block, it's not Mitchell sayes it is in conveneinence center under dash, cant find a 'conveineience center' Another sourse sayes 'behind radio' if it is, please send advice for the most efficient ex...
1997 GMC Yukon SLE 5.7L backfire VIN: 1GKEK13R7V
How are all my fellow techs today? I'm doing great, but I'm back again with a problem I've been fighting the last couple mounths. Have this well cared for Yukon here that developed starting problems back in Dec '09. The owner said it was "poofing" and sometime...
1993 Oldsmobile Cutlass Supreme 3.1L Surge VIN: 1G3WH54T7P
Can anyone tell me the fuel volume specifications for this vehicle? The dealer claimed they do not have the information and it's not available through Alldata. Thanks to anyone who can help.
1993 Oldsmobile 88 Royale LS 3.8L No Start, Surge, Stall VIN: 1G3HN53L8P
Thanks again guys an gals for the help in advance this car was towed in for a hard start in the am that has gotten worse over time no codes fuel psi shows no drop on the first start in the am it starts right up an then stalls you have to play with the throttle...
2003 Pontiac Aztek 3.4L knuckle VIN: 3G7DB03E73
We have a 2003 Pontiac Aztec AWD in the shop. On the rear suspension upper control arms where you would normally have an upper ball joint there is some type of bolt and busing attaching the upper control arm to the knuckle. We have approximately " movement ba...
2006 Pontiac Grand Prix 3.8L MIL Lamp on VIN: 2G2WP55246
To run tests for the secondary air injection I need to test the (2) relays for this circuit.Alldata and Mitchells On Demand do not show me a location for the Air pump relay and Air pump valve relay.I would like to test these relays to determine what is wrong w... Trouble codes: P0411 (Secondary Air Injection)
2003 Saturn Vue 2.2L lack of rpm VIN: 5GZCZ33D13
throttle koeo 100% butterfly opeeration koer throttle 10% apv voltage range ok with alldata data /snapon modis voltage drops to ground /will not achieve [...] back pres.1.2psi check fuel qualty/volume/pres. all with in spec.
2005 Saturn Vue 3.5L security VIN: 5GZCZ53485
Happy monday everyone I have this saturn and I need to know what is the normal function of the security system The customer washed her saturn and noticed the security light flashing after locking the doors with the key fob.and the next day her battery was dead...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Cadillac Escalade 6.0L liftgate lock VIN: 1GYEK63N55
thank you for all the help the relat was in the B Pillar it was just completely wrapped in tape. The door actuator was actaully the problem the door was just stuck closed so i was looking for the relay. Thanks again
1993 Chevrolet K1500 Cheyenne 5.7L Cuts out VIN: 2GCEK19KOP
Thanks to all for their replies. It turned out to be the distributor (again). Replaced under warranty,(again). At least we got a tune-up out of the deal. I am tired of redoing work because of bad replacement parts, seems to be getting worse every day.
1996 Chevrolet C1500 5.0L Poor Idle Quality, Misfire, MIL Lamp on
fixed the cam/crank corelation code with trial and error and by figuring out that the distributor will give you about 20 degrees to play with on the cam sensor. Then tracked misfires down to fuel injectors and installed updated spider assembly and now all is ... Trouble codes: P1345, P0300.
2002 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Surge, Misfire, MIL Lamp on
after hours of checking everything i could think of and what people suggested! it was partially restricted fuel injectors! i swapped them out of a good running 5.3l. comp was 130-145, leak down was good, fuel pressure didn't change and the more i ran it after... Trouble codes: 300 (random misfire).
2005 Chevrolet Blazer 4.3L parking lamps VIN: 1GNCT18X35
this is the best group of guys i have ever worked with, every one that said check trailer wiring was dead right, four flat trailer hitch was melted together shorting out.
2006 Chevrolet Silverado 3500 LS 6.6L starter VIN: 1GCHK23D96
Thanks for all the replies , the problem ended being the starter we had an a/c delco reman starter and the original one we replaced was an ac/delco . we installed a new oem gm starter and the problem was repaired no more noise on start up .
2006 Chevrolet Impala LT 3.9L pcm, tcm VIN: 2G1WC58146
We ordered a TCM, after 3 triple checking that there was no communication with the scan tool, had communication with all the other computers. Power and ground were good. Installed new TCM, good communication now, awesome! Tried to shift into gear and drive in...
1995 GMC K2500 Sierra SL 6.5L No Start, Stall VIN: 1GTGK29F8S
Thanks for all of the replies and assurance guys! We did install a new PMD and the customer let us spend the extra money on a relocation kit which is definately worth it for him in the long run. Thanks for all of your time!! Trouble codes: 18 (pump cam ref), 23 (tps pos 1), 35 (injector pulse width), 54 (to fault), 78 (wastegate solenoid), 87 (high ratio).
1998 GMC Savana 2500 5.7L speed sensor reluctor VIN: 1GTFG29R3W
thank you for the effort, butt in the end it was the most obviuos of repairs, several replies suggested corrosion at p,c,m, connections, or circuits between p,c,m, and v,s,s, and recieved very good replies from jerry in virginia and jerry in new jersey and jo...
2000 GMC Yukon SLE 5.3L Cooling Systems VIN: 1GKEK13T5Y
Thanks to everyone, replied was quick and accurate. Passenger side head gasket has the word "front' facing up when seated properly. Driver side head gasket has the word "front" facing down when seated properly. Easiest way is to look at the positioning tab on ...
2003 GMC Yukon Denali 6.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GKEK63U43
the client did not bring back denalli after 0-2 sensors were replaced. i have talked to her several times and the denalli is running ok, but check engine light is still on. the knock senors codes are still coming up. we did go over all replies at our monday no... Trouble codes: P0101, P0171, P0174, PP300, P0327, P0332.
1999 Pontiac Grand Am SE 3.4L lifters VIN: 1G2NE12E1X
thanks for your help i put them in facing the drive belt and had no problems at all thanks again to all who helped
2002 Saturn SL1 1.9L Mechanical VIN: 1G8ZH52862
first of all I would like to thank everyone that replied.The overall concensus seems to point to the oil control rings being at this point I'm going to do the tsb that michael from wisconsin sent me.Once I perform this and get the results I will updat...
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