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Prev Professional Automotive Repair Technical Discussions for March 22, 2005
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Open Help Requests for GM
Help Request Answers
1987 Buick Electra Park Avenue 3.8L hard starting VIN: 1G4CW5133H
I'll try to make it short, but give as much info as possible. On about 80% of the start-ups the engine will act like the timing is way advanced, with a backfire in the intake. Another tech bought the car with this problem an has replaced the items listed in th...
1993 Buick Regal Gran Sport 3.8L Poor Idle Quality VIN: 2G4WF54L4P
Vehicle came in on hook -- motor siezed due to oil starvation-customer lost oil due to hole in oil pan due to excessive road sign rage. After installation of 57000 mile replacement engine (I have used this boneyard many times and do trust them) the engine idl...
2001 Buick LeSabre Limited 3.8L Battery draw VIN: 1G4HR54K71
Hello group---I am almost ashamed to post this question, but out of frustration and lack of other options here goes. I have this Buick that I have already diagnosed thru testing, research of an applicable TSB and also found great help from the "fix database" h...
2001 Buick Park Avenue Ultra 3.8L stability system VIN: 1G4CU54131
gm techs, this vehicle was brought in just after a large snow storm the service stability system light comes on after the car is driven for 4-5 miles. on first inspection the bracket that holds the level sensor was a bent a bit upward. we straightend it out a...
1995 Cadillac DeVille 4.9L Poor Fuel Economy, MIL Lamp on, Transmission VIN: 1G6KD52BSU
Hey fellow tech, this one is eating my lunch! I've looked at every posibility I think...But can't seem to get this one done. Mil lamp is on with codes 15 & 21, I replaced TPS but I still getting 5 volts ref on the scanner. Does the Throttle POS & CTS share a c... Trouble codes: 21 (Throttle Pos Sensor CKT High), 15 (Coolant Temp Sensor CKT High)
1965 Chevrolet corvette 327CID washer pump VIN: 194375S120
I ordered a rebuild kit for the windshield washer pump, complete with the plunger. Does anyone know the proper procedure for removing plunger. I can't see a way to safely remove the nylon wheel with the teeth on it. It appears to be necessary to remove. Thanks...
1995 Chevrolet Tahoe 5.7L Cuts out VIN: 3GNEK18K2S
I am posting this Tahoe for another shop. There are no codes but as soon as you begin to give some throttle, the Tahoe begins to cut out and run rough. I put my scanner on it and noticed that as soon as you give some throttle to take off or just sitting in the...
1995 Chevrolet Astro CL 4.3L Poor Idle Quality, Stall VIN: 1GNDM19W7S
I have tested all that i know that i can. It just seems to stall out and die when it get warm. If any of you can help that would be great.
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W5S
Hello All, This Blazer wont start, has spark and good fuel pressure. It has no fuel injector pulse. Replace VCM with used part started right up for about 1 minute then died...seemed like it was running rich. Retested found no injector pulse again. Started pull...
2001 Chevrolet Monte Carlo LS 3.4L keyless entry VIN: 2G1WW12E81
This car driving me nuts,replaced bcm because of problem with interior lites,now the problem is with keyless entry,fobs wont work,tried programing with tech 2 and allldata gives me another method witch i also tried,still wont work,i beleive i programed bcm per...
1996 Oldsmobile Cutlass Supreme SL 3.4L Surge VIN: 1G3WH12X3T
The car under hard accelration is going into the rev limiter mode when you hit 3800 rpms when driving just how it normally does in park. When looking at data with the tech 2 it shows the car to be in drive mode on scanner and vss is correct. When you look at i...
1997 Oldsmobile Aurora 4.0L High idle speed. VIN: 1G3GR62C0V
This vehicle does not appear to have any vacuum leaks. Scan data suggests the pcm has run IAC to stop. RPM can be raised and lowered with scanner but will not drop below 1050. If vehicle is put in gear the rpm will drop to around 850. With iac removed and vacu... Trouble codes: P0507 (Idle speed high.)
1997 Pontiac Trans Sport 3.4L abs VIN: 1GMDX06E0V
We have checked all sensors and they ohm ok. cannot find any wiring problems this one has been a comeback nightmare. We have even changed pads & rotors, cleaned and adjusted rear brakes need help.
2000 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZG5287Y
Hi folks, Have one that got me confused. his saturn has a code P0442, comes in about a month after clearing. Has been cleared three times. this time customer guarantees he did not leave gas cap loose. So we went further with diagnosis. Smoke test evap system. ... Trouble codes: P0442 (evap small leak)

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille 4.6L tcc VIN: 1G6KD52YXT
well i got several replies saying a convertor would most likely fix it,But there are other internal causes that it's best to o-haul it. this is a friends car an he is going to drive it for now. special thanks to Jason [...] Leeuw for sending me a bulletin #04-07-...
1989 Chevrolet Celebrity 2.8L Cuts out, Stall VIN: 3G1AW51W4K
We decided to go on advice from replies here. The fuel injectors had low resistance on the #2,4,6 bank. While testing the engine began to misfire on cylinder #4 but spark was good. Rechecked resistance at the fuel injector banks and the injectors were at 2.6 o...
1994 Chevrolet Camaro Z28 5.7L Starting VIN: 2G1FP22P1R
Thanks for all the help, what finally fixed this one. It was another new theft deterant module. We did try all the tips we got like leaving key on for an hour, hooking up battery charger with key on etc... to try to reprogram the module but nothing worked so m...
1994 Chevrolet Lumina 3.1L Hesitation VIN: 2G1WL54T5P
Thanks for all the replies. The customer wanted the car back and wasn't ready to spend additional money for further repair. While we had the car the injectors were ohmed, throttle plate and bore were cleaned and a relaern was performed but still no better.
1995 Chevrolet Astro 4.3L abs module VIN: 1GBEL19WXS
thanks for all the help, we replaced the abs unit. when the piston on the caliper was pushed in the bleeder wasnt opened causing dirt to get pushed back in to the abs unit. we tried and tried to flush it out but in the end the only way to fix it was to replace...
1996 Chevrolet C1500 Suburban 5.7L Rear heater core VIN: 3GNEC16R8V
First let me say sorry for taking so long to post this repair. I was able to burp the rear core by removing the rear heater return hose from the heat control valve located under the air filter. Then clamping the supply hose to the front heater core also clam...
2001 Chevrolet Express 3500 5.7L electric window VIN: 1GCHG39R41
first i would like to thank everyone for responding to my post. You guys are GREAT!, i guess i was reading in to it too closely and not taking a step back and looking at the big picture. Yes it had power from the passeger switch and power from the master switc...
1993 GMC K1500 Suburban SLE 5.7L Poor Idle Quality, Stall VIN: 1GKFK16K7P
Well sure enough it was a weak pulse signal due to a weak magnet on the dist shaft. After two ReBuilt units with the EXCAT same symptoms i kept looking else where (hind sight - that was a big mistake). I ordered a GM dist shaft which the magnet was much larger...
2001 GMC Safari SL 4.3L master VIN: 1GKDM19X32
Thanks to those that replied. I sent the car to the dealer, and they also thought it was a master. Wrong! They replaced various components, including the hydro-boost and the proportioning valve. No results. they finally fixed it by replacing something called t...
1998 Oldsmobile Silhouette Premiere 3.4L Door Locks VIN: 1GHDX03ETW
Found that the splice 311 was the problem. Thanks to all you that help.
1995 Pontiac Bonneville SE 3.8L Surge, Stall, MIL Lamp on VIN: 1G2HX52K7S
the fix was a new ecm. in install the computer 2 weeks ago and havent seen the car sense. Trouble codes: P0341.
2000 Pontiac Montana 3.4L No Start VIN: 1GMDX03EXY
Thank you SOO much for all of you who cared enough to reply!! You all sparked thoughts which lead to further ideas and testing! I had 16 responses, so writing you all individually is not possible, but I do appreciate every one of you! It is also not possible... Trouble codes: P0440, P0300, P1446, P????, B1009, B2734.
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