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Prev Professional Automotive Repair Technical Discussions for June 14, 2006
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52L8S
This Buick came in for mil light on and speedometer in op. The code is PO502. Replaced new vss, cleared code and test drive, still speedometer/odometer not moving, transmission shifting normal at first, then all of a sudden, tranny act up like free or neutral ... Trouble codes: P0502
1995 Buick Century Custom 3.1L Cooling fans VIN: 1G4AH55M8S
This Century is blowing the fuse for the cooling fan relay control circuit, the one the ecm grounds to turn on the fans. It is a 10 amp fuse located behind the fuse block in the glove box. I saw a few posts about the fuse location, but I could not find any thi...
1994 Cadillac Eldorado 4.6L transmission VIN: 1G6EL12Y5R
Hi everyone! I have this cadillac here that is having intermittent electrical concerns. There was quite a few codes in this car when it came and most of them have to do with serial data problems. We have Code 47 which is BCM to PCM serial Data Problem, Code 10...
2002 Cadillac Seville SLS 4.6L climate control VIN: 1G6KS54Y52
Hello all and thank you in advance for your help. The SLS deville has great a/c but will not blow out panel on the drivers side. Mode selection appears to work properly. I can get hot and cold air from the floor but when switched to panel no air comes from ven...
1966 Chevrolet corvette 350CID adding power steering
Have a good long time client, and this little vette as won show after show. Well, client injured his wrist and would like to put power steering on the car. There are several kits out there through corvette specialty magazines. Has anyone done this add on? What...
1988 Chevrolet K2500 Cheyenne 5.7L ign power to coil,etc. VIN: 2GCFK29K0J
no start, missing ign. power to tb, coil, module, fuel pump relay. Coil fires independently. fuel pump works. known good pickup module and known good ecm. have 5 volt ref and 12 v ign to acc like radio,blower motor etc. no codes in ecm. ecm flashes code 12. an...
1988 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2GCDC1472J
hi all This one is for all you gm techs. this probelm has been going on for about 2 years now. the truck is in fair shape and runs generally perfect. accept the first minute and a half of operation. in that time the vehicle runs lean the point of it back firi... Trouble codes: 034 (map sensor circuit signal voltage low high vacuum)
1989 Chevrolet R2500 Suburban Scottsdale 7.4L Hesitation VIN: 1GNGR26N5K
Hope some one has seen and found A good repair for my problem, The T B I shaft or the T BI housing is worn to the point that the Throttle plate is draging on the throttle body, Car quest said they had A repair kit But it was for the top end of the T B I I che...
2000 Chevrolet Blazer LS 4.3L Hesitation, Surge, Cuts out VIN: 1GNDT13W1Y
Ok GM techs I am asking for some help here.. I have been working on this vehicle for way too long now. When I first drove this unit I had the feeling it was starving for fuel. I checked the fuel pressure 58 psi. The fuel filter had just been changed by the cus...
2000 Chevrolet Malibu 3.1L stearing VIN: 1G1ND52J8Y
Ok I am working with 2 malibu's they are a year apart.Both are making the same noises and both I can find any loose parts.The both make a clunking noise that sound's just like a chrystler stab link's going slow like 35 to 40 mph over sharp short bumps.The both...
2000 Chevrolet Impala LS 3.8L Cuts out, Stall VIN: 2G1WH55K1Y
Good challange here. The customer has had this problem since fall of "04. Flickering MIL and the car will shut off. *NO scan data! It will not restart for 40-60 seconds. If you try to restart, it fails to enable starter relay erraticly, it backfires and tries ... Trouble codes: U1016 (in other modules--no communication to pcm)
2000 Chevrolet Express 3500 5.7L Hesitation, Cuts out, Stall, hard start
Hello all. Sorry I do not have the VIN avail. I am sending this from home and did not know I needed it. This van was in last week for hesitation and lacks power. I drove it and noticed a lack of power and was thinking fuel problem. I scanned it and it had no c...
2004 Chevrolet Trailblazer LS 4.2L a/c drain/seal VIN: 1GNDS13S34
does any one know where the a/c drain is on this trailblazer? im thinking its behind the firewall(kinda like the grandcheerokees) im leaking water into the pass floor and im trying to find the drain to ck it out if any one has found any water leaks in pass flo...
1991 GMC C1500 Sierra 5.0L Hesitation VIN: GTDC14HXMZ
I have a California Fish and Game vehicle that was brought to our shop to diagnose a failed smog inspection. It failed due to ignition timing being advanced - 15 degrees btdc, spec is TDC. When timing is set to TDC, the vehicle has a severe hesitation. I have...
1994 GMC C2500 Suburban 6.5L Misfire, MIL Lamp on VIN: 1GKGC26F4R
Hello all, Symptom is on cold start engine starts ok, but misses. Step down on the throtle and nothing happens. Can watch scan data(Modis 6.2) and see TPS voltage sweeping properly but injection pump not responding. Once it starts to warm up it gradually gain... Trouble codes: 36
2000 GMC Savana 1500 5.7L Mechanical VIN: 1GKFG15RXY
Intermittent belt squeak, new alternator; 2 times. New tensioner; 2 times. New belt; 2 times. Idler pulley replaced. Sounds like "light belt squeak" When turning AC on, noise goes away, but returns when AC is turned off. Any help would be appreciated. Thanks.
1994 Oldsmobile Bravada 4.3L Excessive Emissions, Surge, Cuts out VIN: 1GHDT13W0R
This one comes back to haunt us every couple of months.Has no midrange power-falls flat when accelerating.Surges badly.Acts like it's running out of fuel.The 02 voltage drop to 0 as the problem happens.Fuel volume appeared good although I couldn't find a spec ...
1999 Oldsmobile Alero GL 2.4L traction control VIN: 1G3NL52TXX
ETS shuts off by it`s self,no codes,no problems found with brake system. Does not happen a lot,10 mile test drive yesterday it happened once,there is a TPS code(PO122),but it working fine at this time,when ETS acted up the TPS was reading ok. Any help would be...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Custom 3.8L fuel gauge VIN: 1G4HP52K2V
The fix on this one was to bend the arm up for the float. The resistance readings on both unit were within in specification,but after looking at the design the float was going below the fuel strainer so out of the car we had a full swing on the gas gauge but i...
2001 Cadillac Seville SLS 4.6L Wheel Balance VIN: 1G6KS54Y01
Thanks to all that replied. This was a used vehicle we sold but the customer has not brought it back. There is a GM bulletin about the lower control arms that seemed to fit my symptoms. Thanks again to all that replied.
2003 Cadillac DeVille 4.6L Poor Idle Quality, Misfire VIN: 1G6KD54Y43
thank you all. the induction service had removed enough carbon from the intake that the vacuum leak at the rubber boot between the throttle body and intake became very obvious. replaced boot, intake gaskets and throttle body gasket for a successful fix. Trouble codes: P0171 (p0174-), P0174 (p0300-), P0300 (p1574-), P1574 (testing and results).
1992 Chevrolet S10 Blazer 4.3L Poor Idle Quality, Stall
This Blazer seems to be fixed. We installed a Delco Reman ECM and now it's been a few weeks and it's still running ok. The Delco reman could have had better drivers in it, because it still is working. There was no ringing with this ECM on the injector wave for...
1994 Chevrolet Camaro 3.4L Poor Idle Quality VIN: 2G1FP22S7R
Based on the customer feedback this problem is fixed. I ran BG's three step induction cleaner through the system and the customer said after about 3 days the car runs great, stronger and smoother than before. Just another example of the dynamics difference bet... Trouble codes: 77 (Digital EGR Solenoid 3 Error).
1995 Chevrolet K1500 Suburban 5.7L Differential VIN: 1GNFK16K1S
thanks for all the replies.most mentioned transfer case switch.Bingo replaced all set.
1996 Chevrolet Corvette 5.7L Moisture VIN: 1G1YY22P2T
Well guys, some of you were right on the money. We all pretty much knew that the was a moisture problem, but we really didn't know how it was getting in the distributor. What we found was what was suggested by several of you... the vent system was clogged. We ...
1997 Chevrolet K2500 5.7L down shift VIN: 1GCGK24R2V
Thanks to all the members who replied. We test drove the vehicle numerous times and was able to get the vehicle to act up only on a forced down shift. We read a TSB that described a loss of 4th gear and busy 3-4 shifting or TCC cycling TSB#77-71-77. This descr...
2001 Chevrolet Suburban 1500 5.3L shift cable VIN: 3GNEC16T41
The transmission had been replaced or repaired a few months earlier. I studied the situation over and over comtemplating how to make the cables connect in the middle. Then I decided to reverse the detent lever to make the knob face the inside. It worked perfec...
1997 Oldsmobile LSS 3.8L No Start VIN: 1G3HY52K1V
WELL, WELL, WELL. ANOTHER new key and tumbler fixed this one. first one (delco) only lasted 20k! here are the details: when i originally ohm checked the tumbler (with the key in) we had a valid reading of 1165 ohms. this we discovered later was done at a MOMEN...
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