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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 25, 2007
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Open Help Requests for GM
Help Request Answers
1983 Cadillac Eldorado 4.1L Hesitation VIN: 1G6AL5782D
Hi everyone. Nightmare car we got into for a very good customer. Started as repair oil leaks, landed up pulling eng, then trans and resealing everything! No more leaks but now has(or perhaps had before??) driveability issues. The issue can best be described as...
2000 Cadillac Catera 3.0L charging system VIN: W06VR54R8Y
Car came in with customer complaining of an erattic no start condition,we did a charging and starting analysis and found the OEM alternator not putting out enough voltage .At that point we replaced the alternator. The car returned after about 1 week with the s...
1985 Chevrolet Celebrity 2.5L No Start, NO SPARK VIN: 1G1AW35R7F
customer drove in on way in it died sent out service call and it started up after several attempts got it to shop and all was fine ordered parts for baisc tune up plus a fuel pump let it sit overnight and went to pull it in to shop and no start tried spark che...
1990 Chevrolet C1500 454 SS 7.4L No Speed controller VIN: 1GCDC14N3L
Perhaps someone has ran into a similar problem. This truck has intermittent speedometer function. Sometimes will work for 1 to 5 minutes after a cold start, sometimes won't. Alldata and Motor manuals show same circuit layout. This truck has the old TH400 trans... Trouble codes: 24 (Vss signal)
1997 Chevrolet Astro 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDM19W7V
hello everyone i have this astro van with a problem. ive knocking my brain for a couple weeks. van came in running bad and a melted cat converter.i replaced cat converter and rechecked engine. i connected scanner and data stream readings were all over varing u...
1997 Chevrolet C2500 5.7L abs module VIN: 1GTGK24J9V
ecm 1 fuse blew again. scanned pcm & abs, found 1 code, rr wheel sensor. engine runs well. the tech cleared code & road tested. no fuse failure yet. we drove the truck 65 miles & the customer drove it 85 miles before the fuse failed & after replacing the abs m...
1998 Chevrolet P30 6.5L Poor Idle Quality, Misfire, Vibration/Shake VIN: 1GBKP32Y6W
This is the local MAC Tool man's truck. Has the 6.5L non turbo motor. It has what seems to be a misfire when cold and when it warms up, its more like a vibration that comes and goes in a perfect cycle relative to the revs the motor is turning. Under load it sh...
2001 Chevrolet Blazer Xtreme 4.3L MIL Lamp on VIN: 1GNCS18WX1
i have this blazer in the shop that keeps showing codes po449 and po452. i can clear the codes but they come back as soon i clear them .i have replaced the fuel pump module and pressure senso with dealer parts.every time i try to cut the vent valve on and off ... Trouble codes: P0449, P0452
2001 Chevrolet Suburban 1500 5.3L 2-3 Shift VIN: 3GNFK16T31
Heellpp!! This 4L60E is killing me. Came in w/hard reverse originally. Tore down unit found to be a Serta Unit aready replaced once. Found chunck of brass under rear piston???Rear clutches burned up has been hauling a trailer no surprise. Rebuilt unit put Tran...
2001 Chevrolet Blazer LS 4.3L Unknown VIN: 1GNCT18WX1
hi every mechanic. this blaze came in for the bing bang noise at transfer case. no 4 wheel operation.the light 4hi 0r 4l and 2hi doesn't flash, only stead on if you selected by pressing button. no communication with the trans module. but check the cel . no any...
2002 Chevrolet Trailblazer LS 4.2L Hesitation, Cuts out, Tip In Stumble VIN: 1GNDS13S22
Vehicle came in with Customer complaint of a tip in stumble or hesitation just as you accelerate from a stop light. We test drove the vehicle and it does fall on its face after you sit, at idle, through a light cycle. It will even die once in a while,j...
1993 GMC C1500 Sierra 5.7L Cuts out, Stall VIN: 2GCEC19KSP
Well this is one of thoughs needles in a hay stack that you should not take on. I have run over a tank of gas through this unit and it has only acted up twice for a very breif moment. I have a fuel pressure gauge on at all times and a spark monitor on the wind...
1996 GMC K2500 Suburban SLE 5.7L convertor VIN: 1GKGK26R7T
Hello, this GMC tc clutch slips in and out of lock up both in OD and man.3rd at part throttle only, really fast lock ups feels like a miss-fire/consistant shudder monitoring missfires NONE monitor tcc solenoid says ON but can see tcc slipage go from 0 to 60rpm...
2003 GMC Savana 1500 5.3L MIL Lamp on VIN: 1GDFH15T93
This van came 2 mounths ago with mil lamp on po174 lean bank 2 and no run problems. Replaced intake gaskets to updated teal gaskets.2 days later light came back on and went out again.Light has been out till now.Get it back today-light out-history code 174 stor... Trouble codes: P0174
2003 GMC Envoy SLT 4.2L rear axle VIN: 1GKDS13S53
2003 gmc envoy, chirping noise coming from rear of car while in drive making turns. does not happen when you turn from a dead stop. possibly coming from drive shaft or rear diff or axles.
1996 Pontiac Grand Am SE 3.1L Surge, Poor Fuel Economy VIN: 1G2NE52M2T
This 1996 Pontiac came in a month ago with a bad trans noise customer is on a small budget so we installed a used trans. 600 miles later the speedometer starts bouncing and the trans is searching for the proper gear. I can watch the vss on the scan tool and it...
1997 Pontiac Bonneville SE 3.8L Automatic Climate Control VIN: 1G2HX52K7V
This vehicle belongs to an employees mother. Checking this one out for no diag. time! It began with a dead battery and upon jump starting the vehicle she realized the automatic climate control display was lit up and the blower was running, the ignition key was...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac DeVille 4.9L Engine VIN: 1G6KD52B5R
Hey everybody out there thanks for the help- we seem to overthought the problem a little bit! The AC Compressor was locked up completely and wouldn't allow the engine to turn. After removing the belt she finally spun freely clockwise! Thanks again guys.
2000 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR6YR06
Sadly enough I never fixed this one, The car runs great they even called me from Atlanta bragging of the 30 MPG. The secondary air system will still set the check engine light. I have no ryhme or reason as to why. Cadillac was little to no help and gave me a g... Trouble codes: P0411.
1965 Chevrolet corvette 327CID axle shaft VIN: 194675S115
thanks to all that replied pushed in wheel and bolted in axle.all excellant tips on vette rear suspensions its nice to know there is so many good techs willing to help on presant or vintage vehicles thanks again
1992 Chevrolet S10 2.5L Hesitation, Misfire VIN: 1GCCS14A4N
Well it turned out that someone has swapped the ecm with one from ]]I am not sure from what!.Found the proper prom from salvage yard[new one discontinued] and installed.works perfect. checked data and all is normal now.
1994 Chevrolet K1500 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Stall VIN: 2GCEK19K4R
1996 Chevrolet Corsica 2.2L Misfire VIN: 1G1LD5542T
thank you all for the help. i fixed this car with a coil. the coil ohmed good but it did not have enough spark. fuel pressure was on spec. i checked vacuum and the needle was fluttering from 10-15 and would only stabilize off idle at around 1000-1500 rpm. ... Trouble codes: P0301, P0301.
2000 Chevrolet S10 4.3L valve train VIN: 1GCCS19W3Y
Sorry I took so long getting to the bottom of this one, the customer mad the mistake of saying he wasn't in a hurry. Anyway, the valve train problem ended up be from two collapsed lifters, on one bank, the reason fo all the lifers making noise and having exce...
2004 Chevrolet Suburban 1500 LS 5.3L Misfire VIN: 3GNFK16Z74
I am happy to anounce that this vehicle is fixed. I want to take this time to say that some of the fix reports stop at this point and do not give the details. That is frustrating. Now to the fix. After the last report update, another leakdown was done, but ... Trouble codes: P0300 (Random misfire), P0307 (Cyl. 7 misfire).
2006 Chevrolet Uplander LS 3.5L LU Shift VIN: 1GNOV23L16
This is to close the uplander problem. I went to work this morning and cleared the shift adapts and drove. It still did the same thing but this time it did it much slower and I grafted the TCC appliey and the TCC slip again. I notice that the Tcc appliey wo...
2005 GMC Canyon Z71 SL 3.5L blower motor VIN: 1GTCS196X5
sorry but, the customer still has not brought back the vehicle, all were good replies. i will definitely pay very close attention to the blower module connector and wires going to it the next time the vehicle comes in. i think he is upset at us and might hav...
2000 Oldsmobile Bravada 4.3L Hesitation, INT HARD START VIN: 1GHDT13W6Y
Per suggestions sent to me,I did confirm that there is sufficient power to the pump, replaced pump with AC Delco unit, replaced CTS, scoped TPS, checked all grounds and power to PCM. After all of that, it still has the problem. The customer has decided to live...
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