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Prev Professional Automotive Repair Technical Discussions for September 14, 2006
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Open Help Requests for GM
Help Request Answers
1999 Cadillac DeVille Concours 4.6L fuse blowes VIN: 1G6KF5497X
The #1 fuse in the trunk witch is called the Relay Ignition fuse 1 blows intermitently. This fuse feeds the cruise control, ABS TCC sitch, instrument cluster, BCM. I did all I could to look for the short, but it is to intermittent to find. If any one has had t...
2002 Cadillac DeVille 4.6L Mechanical VIN: 1G6KD54Y12
Hi guys, This one is pretty simple and maybe a dumb question. This Deville came in after going to two other shops for diagnostics. We determined that the head gaskets were leaking and the owner decided to replace the engine. My question is this, is it possib...
1997 Chevrolet Lumina 3.1L No Start VIN: 2G1WL52M3U
customer complaint of no-start.vehicle was towed to shop where it has started with no problems as of yet.has memory code of p1626.performed pinpoint test and can not verify concern.all grounds are good and there is 5v reference going to theft module.checked fo... Trouble codes: P1626 (fuel shutoff.....theft system)
1998 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GBEC19R4W
NO VACUUM LEAKS FOUND NO MISFIRE ON MONITOR FREEZE FRAME FOR PO171 SPEED 2 MPH MAP 38 KPA MAF 7.17N gm/sec tps 0% coolant 167 rpm 665 engine load 3%. PO174 2 FAIL COUNTER 44 SPEED 49 MPH RPM 1429 MAF 27.80 gm/sec map 49 kpa coolant 171. i replace the maf senso... Trouble codes: P0171, P0174
1998 Chevrolet Prizm 1.8L headlights VIN: 1Y1SK5282W
Vehicle was towed in as a no start and occasionally would start and die on the fifth try.If you took out the headlight relay it would start and run on the first try.Have had no headlights since day one.The new drl module was smoked as was the original.The engi...
2001 Chevrolet Impala 3.4L Radio VIN: 2G1WF55E91
Have an Impala that BCM was replaced and everything works fine except now the radio is locked. GM offered no help except take it to the dealer. Customer does not have radio unlock code. 1. Is there a way to get unlock code? 2. How do you enter unlock code?
2002 Chevrolet Suburban 1500 LS 5.3L no rear driveshaft speed VIN: 1GNFK16Z13
hello techs. this is my first time using this great site. this suburban came in with service 4x4 on the info display the codes are c0300 rear prop shaft ckt malfuntion and c0327 encoder malf {i belive that is right} all 4x4 systems seem to work fine, my dvom s...
1992 GMC C3500 Sierra 7.4L excessive exhaust te VIN: 2GCHC39NXN
the problem with the truck is the exhaust manifolds are getting so hot that the spark plug boots are just melting away replaced fuel pump for lean condition the driver side is worse then the passanger no play in timming chain does not run like a jump timming c...
1999 GMC K1500 Suburban SLE 5.7L MIL Lamp on VIN: 3GKFK16R3X
we repaired this condition several years ago and just recently the customer commented on the service engine soon light on at times and stated that the condition was intermittant. we scanned the system and the p1404 was back in history. we used our tech2 to acc... Trouble codes: P1404 (linier egr system performance)
1999 GMC K1500 Suburban 5.7L Hesitation
Customer complaint vehicle most times will hesitate and stumble on accel from take off. Acts like not getting fuel. Checked for codes none found, monitor pids all seem normal Ck fuel pressure ok. While problem is happening fuel pressure is steady,tps,maf,fuel ...
1997 Pontiac Grand Prix SE 3.8L Blower Motor VIN: 1G2WJ52K7V
Hello all The complaint of this vehicle is the blower motor is inop at the low speed settings. It only works on high. the other kicker is the headlights turn off went you put the blower switch to one of the inop speeds, and turn back on when u put the switch t...
1998 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 3G2JB1246W
Good Day, Folks! While idling in the shop and watching the scan tool data, the injector pulse width intermittantly will jump up to over 8ms, (from around 2.5ms @ normal idle) This occurs WITH NO CHANGE IN ALL OTHER DATA such as MAP, ECT, TPS etc. This naturall... Trouble codes: P0300 (random cyl misfire), P0171 (fuel system lean), P0172 (fuel system rich), P1133 (O2 insufficient switching)

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue Ultra 3.8L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G4CU5212V
thanks to everyone who replied. it turned out that the cat was plugged. i don't know why i forgot to check exhaust pressure. we replaced the cat and the vehicle runs great. the map and maf are still reading 0 in the data but i will just chalk that up to our pi... Trouble codes: P0300 (random misfire).
1993 Cadillac Eldorado Sport 4.6L Surge VIN: 1G6EL12Y4P
Hello once again everyone: Sorry to say it but this car is not fixed just yet. I tried again looking for a vacuum leak but none was found. I also tried Michael from Rhode Island's suggestion to disconnect battery for a minute and unplug TPS. Then Reconnect bat... Trouble codes: P0030.
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W3T
thank you for all the replies. we found the other filler neck tube to have a hole. we should of replaced both necks the first time. the check engine turn it self off and we have not heard back from the customer at this point. it usually took a couple of weeks ... Trouble codes: P0442.
1997 Chevrolet K2500 Cheyenne 6.5L wait to start light VIN: 1GCGK24FVZ
Thanks everyone who responded. I believe like most of you stated that this is normal operating procedure. It has gotten colder out especially in the morning so the glow plugs are probably cycling a little bit more to make up for the cold start. Once again, t...
2000 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK14V7Y
Thanks for the help. I found that the pcm was bad. Even tried reflashing the original pcm. the new one fixed it. Trouble codes: P0230.
2001 Chevrolet Monte Carlo SS 3.8L Cuts out, Stall VIN: 2G1WX15K31
Well, it is finally fixed. We tried a new ignition switch-no happiness. It finally got more consistant and we were able to do some tests and identify the cause. I caught a snapshot on the scanner and was loosing the 18X. We had replaced the crank sensor when i...
2001 Chevrolet Monte Carlo SS 3.8L Hesitation, Surge, Cuts out, Misfire VIN: 2G1WX15K51
THANK'S GUYS been swamped. took it to local gm dealer to put a new conveter on it 10 years , 100,000 miles. some thing new under warranty thanks again. j mac Trouble codes: P0300.
2001 Chevrolet Silverado 3500 LS 6.6L No Start VIN: 1GBJC34181
Many thanks to William from Michigan and Daryl from Washington! Theirs were the only replies I got but went straight to the heart of the problem. All I needed to do was to pump priming plunger on top of fuel filter ( It is a big round button about 1 1/2 inches...
2001 Chevrolet Impala LS 3.8L motor VIN: 2G1WH55K31
first i replaced the fuel pump assembly, the sender was bad so that was a good place to start. same problem but now i got a code stored for crank sensor,replaced that and so far so good.thanks to all who responded
2002 Chevrolet Silverado 1500 5.3L Engine Knock VIN: 2GCEK19TX2
We replaced the pick-up, changed the oil and put in Mobil One, I preformed a carbon cleaning, Its been a couple of weeks now and no comments good or bad from the customer. So at this point I assume he is satisfied with the repair and reasons for engine knock.
1992 Geo Tracker 1.6L No Start VIN: 2CNBE18U2N
sorry for the delay,customer declined putting a distributor it for the cost.he keeps driving it like it is.i guess were not suppopsed to understand people.do want to thank the replies everyone pointed to a distributor. Trouble codes: 42 (crank angle sensor).
1991 GMC C6000 Topkick C6H042 6.0L No Start VIN: IGDG6H1P1M
thanks for all replies what we decides to do was just re-wire with apump on the frame rail truck was not worth the cost of putting back factory .thanks to all
1998 GMC Yukon SLE 5.7L Excessive Emissions, MIL Lamp on VIN: 1GKEC13R7W
Thank you for the replies and help you all offered. The fuel pressure regulator was intermitenly causing high fuel pressure. It happened infrequently and we could not catch it in the shop. Replacing the fuel pressure regulator made a small difference in the fu... Trouble codes: P0172, P0175.
1999 Oldsmobile Intrigue GL 3.8L right side wheel VIN: 1G3WS52KXX
Thanks to everyone for their help, thanks especially to Brian, Steve and Brad you guys hit the nail on the head, the starter drive was loose and would rattle against the flywheel on right hand turns. The car was finished last night and we have another happy cu...
2001 Pontiac Grand Prix GT 3.8L Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G2WP52K61
The fix turned out to be the oxygen sensor. I was seeing as high as 1100 mV on the scanner (this vehicle only has on upstream O2) so on a hunch I pulled it out, and sure enough, the thimble was broken. Installed a new sensor and gade the car back to the custom... Trouble codes: P0440.
1997 Saturn SL2 1.9L Surge VIN: 1G8ZJ5272V
Thanks for the help. Turned out to be a clogged cat! Even though it had good performance at WOT, I incorrectly assumed that the cat was good. A look inside revealed it to be about 75% restricted.Also the p0141 code came back, a new sensor solved the problem. T... Trouble codes: P0141, P0300, P0326, P1555.
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