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Prev Professional Automotive Repair Technical Discussions for September 2, 2009
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Open Help Requests for GM
Help Request Answers
1993 Buick Regal 3.8L No Start VIN: 2G4WB54L8P
cust states wont start intermitten ,i have not been able to verify .cust said tried to start ten times with no suscess,just cranks. when fuel pump was replaced in jan ,i got the wrong pump from parts house at first ,then was given one that bfit but was not the...
1995 Buick Century Custom 3.1L struts VIN: 1G4AG55M7S
car came in with popping sound in front, test drive to confirm, struts worn out (bouncing over bumps). replaced both struts and mounts, bouncing is gone but noise is not. tighten all frame bolts, same noise. spring jumps on strut when turning, replaced mounts ...
2001 Buick Century Custom 3.1L Poor Idle Quality, Stall, MIL Lamp on VIN: 2G4WS52J11
This one has me baffled! The fuel trims look normal for a few minutes after starting, but then start to climb both at idle and high rpm until they pin. The engine runs fine until the trims go up and then starts running poorly until it stalls. It goes way rich ... Trouble codes: P0101 (mass air flow performance), P0171 (fuel trim lean)
2007 Buick LaCrosse CX 3.8L door locks trunk release VIN: 2G4WC58297
New customer and recently purchased vehicle comes in with no power locks or trunk release. 15A Door/Trunk fuse is blown. Replaced it with 20 instead of 15 just for insurance. Test and all is good, so I thought. Customer comes to pick it up and fuse is blown ag...
1953 Chevrolet Truck 3.9L generator VIN: 131RRK6222
This truck originally came in with a low battery and weak chargeing system. Replaced battery and voltage reg. Charging voltage came up to 6.8 volts ammeter showed charge at right above idle. Owner called back next day,battery was dead and ammeter shows dischar...
1974 Chevrolet Vega 2.3L fuel guage/oil pressure guage VIN: 1V77B4U346
looking for wiring diagram for car. harness at rear to tank modified by previous owners tec. this car was recient purchase by current customer who seem to be looking for pain!also purchased a pacer, sold a completly restores aniversy vett. to buy the lumps.
1999 Chevrolet Blazer 4.3L veh. control VIN: 1GNDT13W7X
This Blazer has a real unstable feel while hitting a dip in the road the bigger the dip the more you can feel the car change feels ok while hittind a bump or a hole. all 4 ball joints and idler arm were replaced and car was aligned. I checked for...
1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 1GCEK19TXX
This one seems to have a P0430 that will NOT go away. Dealer replaced the converter last year, plugs & wires have been done by someone since then. I just replaced all 4 oxygen sensors. the customer says that the light came back one just a few miles after picki... Trouble codes: P0430 (bank 2 cat. eff.)
2001 Chevrolet Blazer LS 4.3L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCNCT18W4
Hi need some help from you gm techs. This blazer is driving us nuts. Intermitently while drving it will start missfiring bad to the point where you need to pull over due to lack of power then it will fix itself and start running great and not do it again for 2... Trouble codes: P0300
2002 Chevrolet Trailblazer LT 4.2L Electronic VIN: 1GNDS13S62
hay need your guys help again. this time i got a 2002 chevy trail blazer and the a/c comp does not engage. itseems to have to do with the ambient air temp on my modis there is 2 ambient air temp pids one is ambient air temp raw at 82f but there is also a ambie...
2004 Chevrolet Trailblazer LT 4.2L Hesitation, loss of power VIN: 1GTEC19M32
They brought it to me for a surging, at 45-55 mph the vehicle will act like it is binding up, (almost like its trying to go into 2 gears at once) looking at the scanner it shows all is good, no DTC's, all data looks good. after you move the throttle 3/4 it shi...
2005 Chevrolet Express 3500 6.0L airbag system VIN: 1GBJG31U25
Hi guys got this brain burner here. Vehicle came in for ABS light on and interior lights coming on when they wanted. Found electrical harness that runs under the driver's seat burnt due to water intrusion and corrosion. Ordered new instrument panel harness fro...
2005 Chevrolet Colorado Z71 3.5L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCDT19685
this truck was driving excellent till all this codes poped p0506 idle control system (rpm too low) p0300 random cylinder misfire detected p0106 map or baro pressure circuit out of range there is hesistation, misfire, poor idle quality, cuts out... we checked...
1990 Geo Metro LSi 1.0L Poor Idle Quality, Cuts out, Stall VIN: 1G23F59621
we have in the shop a 1990 Geo metro lsi 1.6L. the customer complaint is that when turning right it dies. we have duplicated. also has a very ruff idle. the fuel pressure check ok. there are no codes. the only time it does not shut down is if your in 1st gear ...
1995 GMC Jimmy 4.3L high idle VIN: IGKDTI3WSK
Hi all. This Jimmy we have here will start and drive fine cold, once it warms up when you stop at a light it will rev to 1000-1500 rpm. If you then put it in nuetral and give it some more throttle input and release it will idle around 2500rpm. After checking a...
2001 GMC Yukon Denali 6.0L Air Ride VIN: 1GKEK63U71
I am using an updated Tech 2 Scanner. For the life of me i cannot find the Air Ride Information. We have 1 other truck here 2001 Suburaban with Air Ride as well - cannot find it on the vehicle either. thank you
2005 GMC Sierra 2500 HD 6.0L Poor Fuel Economy VIN: 1GTHK29UX5
This truck came in with check engine light on. P0171, and P0174, lean bank 1 and 2. LT Fuel trims at +25 only at idle. Off idle they drop to about +14. Short term is consistant around 0 +/- 5. The guy took it to dealership where they told him intake gaskets. T... Trouble codes: P0171, P0174
2005 GMC Envoy SLT 4.2L condencer
vech. came in for locked up comp. replaced al parts listed and flushed all remaning parts sentr out to cust. one week later its back no freon and cust saw "smoke" under hood.Verify complaint and refill then starts blowing out of condencer outlet,so I replace g...
2002 Oldsmobile Bravada 4.2L No Start VIN: 1GHDT13S22
I need a little help on this one to make sure I get off in the right direction. The veichle has a intermitten crank no start. May start fine for several weeks and then a crank- no start. There is no pattern to when it will not start. Does not seem to be temper...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Park Avenue Ultra 3.8L keyless entry/twilight sentinnal VIN: 1G4CU5314P
Thanks to all for your help. Finally found fault for the key fob problem. Customer had replaced trunk pull down switch which contains the circuits to the trunk ajar lamp. when trunk ajar lamp wire was removed from switch connector the fobs worked and continued...
2002 Buick Rendezvous CXL 3.4L MIL Lamp on VIN: 3G5DB03E72
Thanks for your help. we followed your sugestions and our next step was the pcm. the customer did not understand a probable misdiag. of the tps. and refused to have the pcm replaced. Trouble codes: P0121, P0122.
1990 Cadillac Eldorado 4.5L Mechanical VIN: 1G6EL1334L
Thanks to those techs. that read, understood the post and sent helpful replies. I have not had time to work on this vehicle again. From the replies it looks like it is a guess if it is the top of the condenser or top of the evaporator leaking.
2000 Cadillac DeVille DTS 4.6L unknown VIN: 1G6KS55Y71
well I had an assistant drive in circle while I rode on the bumper with a stethascope and could clearly hear that the starter was hitting the flywheel, as all but 2 replied. I felt before posting that the flywheel was involved. My cusomer is currently shopping...
1993 Chevrolet K1500 Cheyenne 5.7L 3-2 Shift Solenoid VIN: 2GTEK19K7P
As I thought about what was happening with this one, problem only occuring when it it hot, I realized I must have a wiring problem somewhere that is being directly affected by heat. I replaced the wiring inside the trans. so could rule that out, and have exami...
1995 Chevrolet Lumina APV 3.1L Alternator VIN: 1GNDU06DXS
Thanks to those that read and understood the problem and sent helpful replies. The owner of this van has a large output stero in it. (Thus the reason for the high amp alt.) He would go to Mexico City where the traffic is HEAVY and be stuck for hours in slow mo...
1998 Chevrolet Tahoe 5.7L brake lights VIN: 1GNEK13R4X
To everyone that helped, THANK YOU. The response was overwhelming, Once i weeded out the things i did , read all the responses, i bit the bullet and put in a new multi function switch. And solved the problem. 200.00 dollar again thanks.
2004 Chevrolet Suburban 1500 LS 5.3L Traction Control VIN: 1GNFK16Z24
Sorry for the delay! You guys were right... in the old days, the rust buildup problem would cause false activation of the ABS. On the later model trucks, it can cause TC to activate from a stop. I took out the sensors, cleaned the rust and all is good. Thanks...
2006 Chevrolet Silverado 3500 LS 6.6L MIL Lamp on, P0087 VIN: 1GBJK34D86
First, I want to thank Justin [...] for his guidance and expertise while we ferreted through this dilemma. Turned out this vehicle had a total of 4 problems. #1 - The fuel inlet hose under the chassis was collapsing. #2 - 3 fuel injectors failed the return... Trouble codes: P0087 (Insufficient rail pressure).
2008 Chevrolet Tahoe LT 5.3L abs VIN: 1GNFC13J28
Thank you to all who replied after testing circuit after circuit I decided to remove navigation system because it was aftermarket well found communication wires cut I looped them and vehicle was on its way once Again Thank You
2006 GMC Sierra 1500 SLT 5.3L Cuts out, MIL Lamp on VIN: 1GTEK19BO6
FOUND HI RESISTANCE AT BLACK WIRE WITH WHITE TRACER ON PASSENGERS SIDE REAR OF CYLINDER BLOCK. IS THE HARNESS GROUND FOR TAC. THANKS FOR ALL YOR HELP AND INPUT Trouble codes: P0102, P1516 (electronic throttle module falt), P2108 (tac module fault), U0107 (loss of comunication with throttle actuator).
1995 Oldsmobile 88 Royale LSS 3.8L Poor Idle Quality, Stall, Misfire VIN: 1G3H45216S
due to financial cicumstances customer has decided not to fix vehicle at this I dont know if injector would fix or not.thanks to all who helped!!!
1994 Pontiac Grand Am SE 2.3L No Start VIN: 1G2NE1533R
Wow Guys, this has been a dooozy! After many hours of chasing my tail, I have absolutely no fix to offer. Customer is a friend and curreltly laid-off. I was trying to work on his vehicle in my spare time as to not have to charge him anything. NO FIX! In...
2006 Pontiac G6 3.5L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1G2ZG55876
Thanks to everyone who took their time to respond. It was the TAC. 293.56 list from the dealer. Funny how if this was European the throttle body would have been twice that... No adaption needed. What a concept! Thanks guys! Trouble codes: U0107 (Loss of comunication between TAC and ECU).
2002 Saturn LW200 2.2L insrument panel VIN: 1G8JU84F62
thanks for all the help, we found a bad dimmer fuse on left side fuse pannel. this vehicle also has one on the right so be careful. just a note lights will work without the dimmer switch in stalled!! but not a bad dimmer fuse.
2004 Saturn Vue 3.5L torque converter VIN: 5GZCZ53484
Customer has not brought the car back in for repairs, but thank you to Ernest for the TSB I was looking for. I will add a fix if/when customer shows up. THANK YOU!
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