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Prev Professional Automotive Repair Technical Discussions for March 21, 2007
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Open Help Requests for GM
Help Request Answers
1993 Cadillac DeVille 4.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KD54Y03
Hey guys; This one is killing me. 90% of the time this has a dead miss #6 cylinder. Pulled the spark plug and was fuel fouled. Installed new plug and still missing. Performed injector balance test (OK); Scoped with low amps probe #6 injector (good - even show... Trouble codes: P0300 (Random Misfire), P0385 (CKP Sensor B)
1997 Cadillac DeVille 4.6L idler pulley VIN: 1G6KD54Y0V
Vehicle returned with same condition. Idler pulley bolt broken with no visible cause. A/C compressor and alternator both turn freely. Found alldata bulletin concerning pulley alignments which mentioned idler pulley bolt and torque but not much else. Anybody se...
1999 Cadillac Seville STS 4.6L Mechanical VIN: 1G6KY5492X
putting left side cylinder head back on after fixing blown head gasket.did the time-sert thing. was ok till i went to mitchell on demand to set timing chain marks. very poor picture and not enough info. has anyone done this before and pos may have another info...
2000 Cadillac DeVille 4.6L alternator VIN: 1G6KD54Y4Y
we replaced alt,now it is only charging at 11.9 volts @ 30 to 42 amps at idle. if you load sys it charges at 11.9 volts 60amps,if you charge the battery volts to 12.2 the alt output is 0 amps and the battery light is on until you create enough load to drop bat...
1991 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality VIN: 2GCEK19K5M
This truck came in for a high idle. I found the throttle body gasket bad and replaced it. The idle lowerd but still at 1000 RPM. I checked the TPS it's at .60 volts. The IAC is th 35 at idle. I checked for vacum leakes none found. If anyone has any Ideas I wou...
1998 Chevrolet K3500 Cheyenne 5.7L No Power VIN: 1GCHK34R1W
This truck just came from the engine rebuilder, he can't get it squared away, many things have gotten us to this point, but for now the lack of power is the latest problem. Very, very low power, I can't find a vacuum port to take a reading, but it idles fairly...
1999 Chevrolet Malibu LS 3.1L ignition switch VIN: 1G1NE52M4X
Hi all this vehicle was towed in today for a key that would not turn, tryed all i could to get to turn but could not. After following the process i have seen on here was able to drill out the lock cylinder with no damage to housing besides the small hole i dr...
1999 Chevrolet K1500 LS 5.7L 4wd VIN: 1GTEK19T2X
hello group, first i would like to clarify that this truck is not equipped with a 5.7l but has a 5.3l engine! this option was not offered!? customer stated that the 4wd was inoperative in 4wd hi and 4wd lo only. he stated that 4wd auto was working well. upon...
2002 Chevrolet Express 2500 5.7L Hesitation, MIL Lamp on VIN: 1GC6625R82
Thanks in advance. This van came in with a customer complaint of intermittant check enging light with hesitation/misfire. Scanned codes and no current codes but p0300 and p1381 present in history codes. Attempting to diagnose but mitchell information limited. ... Trouble codes: P0300 (misfire code), P1381 (misfire code com. error between pcm and ebcm)
2003 Chevrolet Cavalier LS 2.2L No Start VIN: 1G1JF52F63
This vehicle has an intermittant no start, once in forty or fifty starts. When no start occurs theft light stays on, shift interlock will not release and computer will not communicate. There were two u codes related to open and short in communication bus (u130... Trouble codes: U1301, U1302, U1064, P1626, P1631, P1630
2005 Chevrolet Impala 3.4L Misfire VIN: 2G1WF52E95
breaks down under heavy accel, over 3000 rpm. has new coil , injector, wire, plug and new valve springs on no. 4 cyl. new computer, new cat. convertor. also removed exaust pipe from muffler back Trouble codes: P0304
1997 GMC Savana 2500 SLE 6.5L Hesitation VIN: 1GKGG25F2V
This van will surge and hesitate when fuel gauge drops below 3/4. Fuel gauge will then bounce all over the place.I can see nothing in the wiring diagrams of the fuel sending unit tha would cause this problem. There is one tbs on the injector pump . Has anyone ...
1999 GMC Sonoma SLE 2.2L spark plug VIN: 1GTCS1946X
Hey guys! As you can see in the related repair history, we have a problem with the #3 spark plug. When the truck is running on a good plug it runs great. There has been a problem that we have not been able to locate for over two years now that causes the truc...
1999 Oldsmobile Cutlass GL 3.1L MIL Lamp on VIN: 1G3NB52J5X
Car came in several weeks ago with the check engine light on. Code p1133- O2 Sensor not switching. Performed the diagnostic tests in Alldata which led me to replace the sensor. I test drove the car with the scanner on it and o2 readings looked good. The car ha... Trouble codes: P1133
1997 Pontiac Grand Prix GT 3.8L headlights VIN: 1G2WP52KXV
Hello, This car is my personal automobile and it has me and my peers in awe! When the blower motor quite working on speeds 1-2 I went for my usual component! The blower motor resistor. After testing and confirming it was bad, I replaced with a unit from Napa,a...
1999 Pontiac Grand Prix GTP 3.8L Cooling Systems VIN: 1G2WR5211X
I think I have a famous gm intake gasket leak but This is my first supercharged 3800.No exhaust in coolant blue fluid in the tube method.No external coolant leaks ( pressurizied cooling system ).No water in the oil,but it is using anti-freeze.It doesn't miss o...
2000 Pontiac Grand Prix GTP 3.8L Excessive Emissions, No Start, Poor Idle Quality, Stall VIN: 1G2WR1217Y
vehicle came in for no start problem. when doing a precheck in parking lot, car started and drove in shop. was loading up & black smoke, but cleared up. after awhile it cut off. tried to restart would not . now flooding out. have checked coolant sensor, maf & ...
2002 Pontiac Firebird 3.8L headlites VIN: 2G2FS22KX2
see related...sorry

Fixes & Summaries for GM
Fix/Summary Answers
1984 Cadillac Eldorado 4.1L charging VIN: 1G6AL5786E
thanks to all that replied as most of you pointed out there is another belt that runs the water pump/airpump/crank than the alt belt just goes from the alt/water pump as it turns out the air pump belt was glazed over and slipped when it got hot but never sqeal...
1991 Chevrolet Astro CL 4.3L backfires VIN: 1GNDM15ZXM
Thanks guys, a lot of you were on the right track. It was an over sight on our part. We replaced ignition wires on this vehicle a few months ago, so we overlooked the obvious and assumed it could not be ignition wires. After pulling our hair out for a while we...
1995 Chevrolet Blazer 4.3L No Start, Stall VIN: 1GNDT13W85
Richard, Gilbert, Michael [...] all sent me in the correct direction with this one. I know I had limited info to help you assist me but I knew (as common as these units are) that someone had seen this exact condition with similar sympto...
1997 Chevrolet Cavalier LS 2.2L Poor Idle Quality, Hesitation, Poor Fuel Economy, MIL Lamp on VIN: 1G1JF524XV
I pulled all injectors from engine and replaced them with new dealer injectors,idle cleared up and random missfire cleared.I found resistance values to be different between different manufactures,enough to cause pcm to missfire certain injectors at certain tem... Trouble codes: P0300, P0301, P0304.
1998 Chevrolet Camaro Z28 5.7L Hesitation, Surge, Misfire VIN: 2G1FP22G3W
Well, the misfires have gone away. After closely examining the ECT wiring and testing both it and the sensor; both were ok. Many of you pointed me it that generally direction. Also, I took many of your advice and cleaned the MAF, that did help. The fuel filter... Trouble codes: P0101, P0300.
1999 Chevrolet Venture 3.4L rear door VIN: 1GNDU06E8X
Morning fellow techs, this van is fixed. I got 2 responses both stating that I have to get into the inner door and jockey the latch open. Well I had a friend help me hold the inner panel of the door open as we both wrestled with the latch and finally got the d...
1999 Chevrolet Camaro 3.8L hard start hot soak VIN: 2G1FP22K5X
thanx to all that replied...sorry that i took so long to post a fix just wanted to make sure it was fixed...I got 15 replies and ten were correct when they said fuel pressure regulator not that the other 5 werent good leads,pulled the vacuum hose from regulato...
2000 Chevrolet S10 2.2L battery VIN: 1GCCS1442Y
thanks guys for all the help. battery was sulfated, on a high amp charge, voltage went over 17in about 4 minutes.
2001 Chevrolet Suburban 1500 5.3L no powersteering VIN: 3GNFK16TX1
thanxs to everyone who replied the fix was a oring in the box was blocking pressure flow i took every thing back apart and looked at it and found the oring to be the problem, this was is fixed and gone.
2002 Chevrolet Silverado 2500 HD 6.6L fuel gauge VIN: 1GCHK23182
well everyone thanks for all your input. i got lots of feedback that the sender was the problem. i already new that there is an extreme problem with gm senders but i had not done one on a duramax. well, i have found out some info in my search with the local de...
2003 Chevrolet Suburban 1500 LS 5.3L passenger side bottom heated seat VIN: 3GNFK16Z43
hello, everyone I gave the customer a few appointments and he did not wish to spend anymore money for his wifes comfort. I believe if i would have ohm checked the lower seat it would not have been in specs. But I will not be able to find out. Thanks for your...
2000 Oldsmobile Silhouette GLS 3.4L No Start VIN: 1GHDX03E8Y
The passkey module and reprogramming fixed it, Thanks to all who submitted!!! Trouble codes: P1626, U1000.
2001 Oldsmobile Alero GL 3.4L Poor Idle Quality, Surge, Stall, Misfire VIN: 1G3NL12E51
It seems that the fuel in the tank had something else in it. We drained the tank (after totally exhausting all other options) and added 3 gal. of fresh fuel. It ran fine every time we started it up. It's amazing how one car can make you absolutely crazy! Thank...
1984 Pontiac J2000 Sunbird 2.0L choke light VIN: 1G2AB69B7E
replacing the alternator was the fix. I still don't understand why the resistance is higher with the engine running. When I disconnect the alternator the resistance goes back to normal. The resistance was going down as the battery was getting closer to a full ...
2002 Pontiac Bonneville SSEi 3.8L Heads Up Display, and Heated Seats VIN: 1G2HZ54102
I appreciate all of the attempts at help. The resistance of the seat elements had gone too high wich wouldn't allow them to turn on. The new elements were not that pricy but I just put in a blank off plate where the switches were, cost about $20. Also the HUD ...
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