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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 16, 2009
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Open Help Requests for GM
Help Request Answers
1954 Buick special 325CID missing vacuum lines VIN: 4NOTAVILAB
guys i need a little help,i'm working on a resto job,and whom ever started on this cut the vacuum lines off,and the shop manual does not have a vacuum diagram in it,so if any body has one or knows where i can get one,it would make an older guy that owns this c...
1999 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y9X
Hi im Doug.Have this 99 Deville car towed to me for a no start.Verifyed and noticed the info center flashing 3 messages,1)theft system problem,2)car may not restart,3)service air bag and the PRND321 is flashing.Plugged in two different scanners and both say no...
2003 Cadillac DeVille DTS 4.6L readiness monitor VIN: 1G6KF57983
Hi everyone, We had this 2003 Cadillac in a few weeks ago with a p0420 code. We installed a new catalytic converter and rear o2 sensor. The customer was in a hurry at the time, so we cleared the code and explained to him to drive the car for a week and come b...
1985 Chevrolet Cavalier 2.8L MIL Lamp on VIN: 1GJE67W0F7
mil on always, checked pcm unable to read data or pull codes. performed trouble tree diagnostics and found prom the problem. unable to locate any proms either updated to speed density or standard mass air operation. does anybody have a prom or car lying around...
1996 Chevrolet K1500 Suburban 5.7L No Start
I have a 1996 Suburban that has NO injector pulse. It shows crank signal in RPM parameter on my Snap On scanner. There are no DTCs. The problem is intermittent. I was about to send the car home and it quit starting. It starts and runs fine with a shot of carb ...
1999 Chevrolet Monte Carlo LS 3.1L No Start VIN: 2G1WW12M1X
I am getting no injector pulse. Spark is fine. Power to injectors is fine. Checked the theft deterrent system. Key pellet resistance reads the same at connector below dash when insterted into lock cylinder. Hz reading to pcm 49HZ from TDM. All grounds ...
1999 Chevrolet Astro 4.3L Dome Light VIN: 1GNDM19W4X
Hello fellow techs. I have here a 1999 Chevy Astro Van that has an issue with the interior dome light remaining on. This vehicle has a factor installed remote keyless entry system. I do not have a Tech2 so my diagnostic capabilities for accessing Body functio...
1999 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GNDM19W8X
Hey guys, here we go again. I have a vehicle in that has the check engine light on. I have checked the codes and it showed PO300, random misfire. I have done a tune-up which included, cap, rotor, wires, plugs, fuel filter and air filter. I have also cleaned th... Trouble codes: P0300 (Random Misfire)
2000 Chevrolet C3500 5.7L engine VIN: 1GBGC34R6Y
when veh is cold runs great after warmed up and engine at idle still ok rev the engine and you lose rpm's note veh dose not have to be drivin. any help would be great thank you
2001 Chevrolet Silverado 3500 6.6L abs VIN: 1GCJK3315F
abs motor runs all the time
2001 Chevrolet Corvette 5.7L Alternator VIN: 1G1YY32GS1
Alternator stops charging intermittently. Monitoring battery voltage while driving shows alternator not charging for a few seconds at a time. We have only experienced a complete failure of charging for [...] only a few times. When it was NOT charging the i...
2003 Chevrolet Silverado 1500 4.3L MIL Lamp on, LEAKING FUEL VIN: 1GCEC14X03
after running truck for an hour we couldnt get it to leak- so after check on scanner found it was not venting and the purge sol was 0%. i put an aftermarket fuel pump in and think it is possible that the pressure sensor is part of it that could be bad. not sur... Trouble codes: 455 (evap large leak)
2004 Chevrolet Suburban 1500 Z71 5.3L Hesitation VIN: 1GNFK16Z54
this suburban intermittently has a hesitation, usually happens from a dead stop, this thing will fall flat on its face then take off a second later and run fine, there are no codes, fuel pressure is ok, and so is regulator, throttle body is clean,this thing ru...
2004 Chevrolet Trailblazer EXT LT 4.2L Hesitation, Poor Fuel Economy, No Power VIN: 1GNET16S34
Here we go again. Got this Trailblazer thats giving me fits. Came in with a complaint of no power. Test drove and verified. Engine won't rev past 4500rpm in any gear. will run interstate speeds if you give it enough time. Pulled code and found P0014. Found inf... Trouble codes: P0014 (Cam Actuator), P0300 (Misfire), P0171 (B1 Lean)
2004 Chevrolet Malibu 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G21W53664
customer had car towed to my house for running very badly. after checking out found misfire on cylinders 1, 3, 5,. 5 cylinder all the time and 1 and 3 under load. swap plugs and wires around no change spark good on all cylinders. pulled intake and check inject... Trouble codes: P0300
2004 Chevrolet Suburban 1500 LS 5.3L Electronic VIN: 1GKEK63U94
this vehicle has dual zone hvac when first started everything works fine about 2 minutes in the driver side goes to hot and stays until you cycle the key the pass side works fine all the time no codes i know the early models have had problems with control head...
1997 Geo Metro LSi 1.3L convertor VIN: 2C1MR5294V
Replaced engine in car after #4 rod made a vent hole in the side of the block. After installation, the car wouldn't move and made a hissing noise. Replaced torque convertor in transmission and all seemed fine. While driving car at 55 mph it seemed like it need...
1999 GMC Savana 2500 5.0L No Start VIN: 1GTFG25M8X
van came in crank no start. died out on road. i have good spark fuel pressure and compression, but still no start. at a total loss as to where to go next. tried doing a security system relearn no change. tried starting fluid no different. all scan data looks g... Trouble codes: P0340
2005 GMC Yukon XL 1500 Denali 6.0L Acceleration VIN: 1GKFK66U45
I have this posted in The ABS but it is a traction control problem. First off we cannot recreate the problem. There are no fault codes in any computer module. However the customer says when accelerating from a stop (moderate acceleration) and under 20 m.p.h. t...
2004 Pontiac Aztek 3.4L Cuts out VIN: 3G7DBO3E34
this vehicle feels like it's running out of fuel at while driving at around 20 mph. the exhaust was clogged and ireplaced entire exhaust including converter. it will not lose power when power braking, only when moving. vehicle has no codes, no history codes or...
2005 Pontiac Grand Prix GT 3.8L radio VIN: 2G2WS52225
this car has a buzzing noise out of rf door speaker that will happen intermittenly only when radio is off sometimes last for a few seconds sometimes one minute you will be driving down road and there it is almost sounds like alternator interferance it does cha...
1999 Saturn SC2 1.9L Vibration VIN: 1G8ZH1278X
Hi i have a Saturn here that has a pretty good vibration at idle while in drive. Its not terribly bad but it does make this droaning noise throughout the car that really goes through you. The engine is running properly and idleing at the proper rpm. I have not...

Fixes & Summaries for GM
Fix/Summary Answers
1968 Buick WILDCAT 430CID fuel gauge VIN: 4GG678C108
thanks to all the responses, we recommended repairs in side the tank but customer has not returned car for repairs at this time
1994 Buick Park Avenue 3.8L shifting VIN: 1G4CW52L4R
Thanks for all the replies! I call this "fixed" for now - but not really. The customer did not want to spend the money to remove the transmission and tear down, but wanted to continue driving it - and wanted to know if there something that I do to "get them by...
1987 Chevrolet El Camino 5.0L Misfire VIN: 3GCCW80H9H
Hello Fellow Techs This is a priceless resource to have access to.Within 12 hours I received over 40 great ideas,you guys are great.Anyway this engine is fixed,it turned out to be a broken valve spring on the #1 cyl Exhaust valve.I had looked at the valve tra...
1996 Chevrolet G30 Sportvan 5.7L Cuts out, Stall VIN: 1GCGG35KXT
Turns out that this van is an HD model wich means it is OBDI and was not eguipped with an electronic EGR. So I checked and found out that the wrong control module was installed. Put the old one back in and the van barely ran. Install a Reman unit and all is we... Trouble codes: 32 (low egr flow), 66 (torque converter control circuit), 67 (2-3 control circuit).
1998 Chevrolet C2500 Cheyenne 5.7L pass key VIN: 1GCGC29ROW
found heat @ ing switch would let it start & run replaced ing switch problem solved!! THANKS TO ALL
2001 Chevrolet S10 4.3L Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCCS19WX1
Found out that reluctor was hitting crank sensor GM has a spacer to resolve this issue Trouble codes: P0335.
2000 GMC K2500 Sierra SL 5.7L Speedo / ABS VIN: 1GTGK29VXY
to the best of my knowlege this one is fixed -- Since all problerms seemed to center to inputs to brake control module I removed and cleaned the connections at the module - it is mounted on the frame frame under the drivers seat. I also checked and cleaned co...
2003 Oldsmobile Silhouette Premiere 3.4L Hesitation, Surge VIN: 1GHDX03E43
vehicle stopped acting up will post again if problem returns thank you everyone
2005 Pontiac Sunfire 2.2L head,timinchain VIN: 3G2JB12F55
thanks to all.special thanks to gene and matt. i got head off and to the machine shop to have the spark plug drilled out and the heliecoil installed. the cam tensener does not need the special tool to twist it in.can be done by hand.gee i have one now hope i u...
2006 Pontiac Grand Prix 3.8L heater core VIN: 2G2WP55216
As stated in my help request I was certain there was no air in this system. But I tried some of the suggestions for different bleed procedures. David from Cal. mentioned reversing the hoses. That was a thought that had crossed my mind so I went with that and i...
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