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Prev Professional Automotive Repair Technical Discussions for May 14, 2009
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Open Help Requests for GM
Help Request Answers
1989 Buick Reatta 3.8L abs VIN: 1G4EC11C9K
After bleeding and adjusting emergency brake, we test drove this vehicle and with the first push of the brake pedal the amber ABS light comes on, then the as we push the pedal on down to stop the red brake light comes on and will have good brakes , really stop...
1998 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y1W
need some thoughts on this one. has had 2 sets of ckp sensors in it for intermittent no start previously, now it will not start, i have both ckp pulses, cmp pulse, spark, fuel pressure, battery voltage at injectors and no injector pulse. no dtcs present at thi...
1990 Chevrolet Lumina 2.5L Stall, Poor Fuel Economy, MIL Lamp on VIN: 2G1WL54R5L
This POS makes absolutly no sense at all. With a snap-on brick, a cold engine, the coolant temp. sensor read's -40 deg., the mat sensor read's 392 deg.( hot). I have checked the sensor grounds (the coolant sensor & the TPS share a ground circuit and the MAT & ... Trouble codes: 15 (coolant sensor signal voltage high)
1994 Chevrolet Corvette 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire VIN: 1G1YY22P9R
idle surges severely ,hot,pings,iac fluctuates,tach flickers,rpm on scantool glitches,temp gets high like its running lean o2's still switching,fuel press ok,when cold start vehicle runs good,smoked it,scoped optispark and checked drain,checked iac tps o2's ma...
1997 Chevrolet Lumina 3.1L Hesitation, Surge VIN: 2G1WL52M7V
This vehicle will lose power like it is running out of gas but when you step on the gas and let it downshift the engine has plenty of power. I dont notice any problem while cruising at highway speed, only when accelerating from a stop. The problem seems to go ...
1998 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R3W
crank but no start, good fuel pres. getting injector pulse with and seems like injectors not firing. will start with carb clean. security key does not seem tobe an issue.
1998 Chevrolet C1500 Cheyenne 4.3L Surge, Misfire VIN: 1GCEC14W9W
The customers complaint is that the truck will buck and jerk and feel like it wants to quite. On a test drive it only acted up once and it won't act up again. The cap and plugs are ok. The fuel pump and filter are ok. Does anyone have any ideas, Mike Trouble codes: P0300 (Multiple Missfire)
2000 Chevrolet Astro 4.3L ebcm VIN: 1GNDM19W7Y
I have seen postings of this simular problem, with the ground wires to the EBCM. I can not find the ground locations, if anyone knows where they are or has had a simular problem, Help.
2000 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1G1JC52401
hello all :0) i have a 2000 cavalier in my shop. customer states driving down the road all of a sudden, cluster went dead, vehicle would not accelerate, check engine light come on,. scanned vehicle had camshaft sensor code, replaced camshaft sensor. also rando...
2001 Chevrolet Suburban 1500 5.3L No start-intermittent VIN: 3GNFK16T51
Have not seen this occur yet, had the truck for four days. Customer drives anywhere, comes back after a minimum of an hour and battery is dead. Always jumps right off and starts right up. Customer is very articulate in describing whats going on, don't think it...
2001 Chevrolet Malibu 3.1L interior equipment VIN: 1G1ND52J81
I have a Malibu one of Chevy's finest when you first start it no DRL, Radio, Blower fan, Fuel gauge inop. I have followed the flow chart from All Data I have no power at the fuse for the cruise control on right side of dash but light in button on wheel lights ...
2001 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GBDM19W01
veh has missfire on 1 3 5 cylinders long term and short term fuel trim is normal. Trouble codes: P0300 (random misfire)
2002 Chevrolet Astro 4.3L Unknown VIN: 1GCDL19X32
I have never had a complaint that "my brakes stop too quick" before, when coming to a stop the last couple of feet the van stops so quick that he spills his coffee every morning all visual checks are o.k., he wants to change pads and rotors but since that has ...
2003 Chevrolet Silverado 2500 6.0L Misfire VIN: 1GCHK23UX3
Hi Folks. This truck has light misfires on all cyl. tried all the listed repairs with no help. Had a local GM master tech suggest to pull the crank sensor and check for damage. None found. Did have heavy rust buildup on mounting serface, cleaned that and still... Trouble codes: P0300 (Multiple Cyl. Misfire)
2003 Chevrolet Tahoe LS 4.8L starter VIN: 1GNEC13VX3
hi. having a hard time with this one. usually i can get by reading fixes but this does not seem to match one. 03 tahoe no crank,no communication from computer.i.e. no codes available. when turning the key to start only lights on dash are seat belt and theft lo...
2003 Chevrolet Impala 3.4L cooling fan VIN: 1GCW145HYU
the problem is that the fan (low and high)dont come on at anytime,the temp. is come up to 240-250 and they still not be command ,the command on the scanner fc control is always off,when i drive it they gone on and off. need help guys!!! thanks
2004 Chevrolet Silverado 2500 HD 6.6L Misfire VIN: 1GCHK23104
Gm techs Im replacing left side injectors on this duromax for missfire after pulling valve cover I noticed the inlet to the injectors are plugged up with a gritty sandy looking junk.I believe the fuel system is contaminated possible cust is making his own fuel...
1996 Geo Metro LSi 1.3L No Start VIN: 2C1MR5297T
Car will not start. Have injector pulse and fire for about 2 seconds after cranking the engine and then gone. replaced ecu, ignition coil, igniter, distributor, crank sensor and noise suppressor. I have power to coil and injector but I am losing signal to each...
2002 GMC Sierra 1500 SL 5.3L battery light VIN: 1GTEK19T72
First time the truck came in it had a constant battery light on and the guage showed Alt not charging. We tested the system and found Alt. not working. Replaced Alt. with ac-delco unit and all looked good. Customer drove down the road and was back 30 minutes l...
2008 Pontiac G5 2.2L leaking during rain VIN: 1G2AL18F08
hey fellow techs, help, help on this one, this g5 came in with a waterleak a couple of weeks ago, with waterleak on drivers side floor board between floor mat and carpet retainer. pulled carpet back and leak tested with high pressure washer hose, and guess wha...
1997 Saturn SC2 1.9L Excessive Emissions, Stall VIN: 1G8ZH127XV
Thanks in advance to all. I sure hate asking for help but we're at our wits end. This Saturn came to us from another shop - the problem is the vehicle will not start when it is very wet out (raining etc.) or will even stall when it has been driven through a pu... Trouble codes: P1599 (Manufacture Code - Stall Detected), P0336 (Crankshaft Position Sensor A Circuit Range/Performance), P0326 (Knock Sensor 1 Circuit Range/Performance Bank 1)

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP54K21
Thanks for the many replies. It looks like this situation is a problem with the ground circuit or the PCM. It is intermintent and now is functioning fine. So I have released the vehicle and customer will bring it back when the p0440 reoccurs. If the site lets ... Trouble codes: P0440.
1994 Cadillac Eldorado Touring 4.6L keyfob VIN: 1G6ET1297R
Thanks for all your replies the fix was to programm the one keyfob 2 times, the system needs to see to learning events to storm the coding. Thanks again to all Andy
1994 Chevrolet K2500 Cheyenne 7.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GCGK29N2R
well this truck is fixed here are the problems first fuel pressure was too low 13-15 it needed to be 26-32 and i replaced fuel pressure reg and it was same ordered in 2nd one and sprins was stifer and it worked. The second problem was loose magnet on distribu...
2001 Chevrolet Silverado 2500 HD 6.6L Cuts out VIN: 1GCHK23181
Hi Group: Sorry about the late close but I wanted to keep it open as long as I could, and get it fixed. The customer made two appointments and blew both of them. I hate to close with out a fix but time is running out. Below are the three replies I received. Th... Trouble codes: P0093 (Large Fuel Leak).
1998 GMC C1500 Suburban 5.7L Hesitation, Surge VIN: 1GKEC16R8W
released vehicle to customer. customer took truck for a long trip. returned and problem was worse. scoped crank sensor. after heating up sensor signal showed deterioration. replaced sensor. fixed
2003 Oldsmobile Alero GL 2.2L radio VIN: 1G3NL52F13
Thanks to everyone that posted help unfortunately I am closing this help request without any helpful info. Customer brought car in and left it for 3hrs, we could not get radio to stop working so we could check the first procedure posted, so they decided to jus...
1997 Pontiac Grand Am SE 3.1L instrument cluster VIN: 1G2NE52M3V
thanks guys for the information,it turned out to be the cluster itself,checking the pin terminals on the cluster there are three grounds and one had 13.37v coming out when connected and ground when unplugged,cluster had an internal short,thanks again for letti...
2005 Saturn Ion-2 2.2L Misfire, MIL Lamp on VIN: 1G8AJ52F25
all drivers and grounds checked out on this car as previously explained. I noticed when the module was delivered it had been handled and installed at some time. Ordered another new module, problem fixed. I marked the module defective (not the box!) Like Mark ... Trouble codes: P0300.
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