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Prev Professional Automotive Repair Technical Discussions for January 31, 2007
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Open Help Requests for GM
Help Request Answers
1998 Buick Regal LS 3.8L battery VIN: 2G4WB52K2W
Hi, Have this buick that we have been chasing a parasitic draw for a couple of weeks. When the draw appears it is a 12v draw. Pulling the bat1 fuse takes it away or pulling the 15amp fuse in the interior fuse panel that is labeled radio rfa cluster hvac takes ...
1993 Cadillac DeVille 4.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6CD53B9P
This is my first post. Please help me. I rebuild automatic transmissions so I'm not that good with misfires. Thanks. This car was running rough always. The service engine soon light came on and it would sometimes stall. It would always restart. You did not ha... Trouble codes: E23 (Electronic Spark Timing EST Signal Fault), E41 (Camshaft Position CMP Sensor or Circuit Fault)
1999 Cadillac Catera 3.0L 2-3 shift VIN: W06VR52R3X
Just bought vehicle for wife. Serviced trans per alldata specs. harsh 2-3 shift.hard clunk on accel,decel 2-3. now occasionally goes for 3 and seems like neutral for ? till it decides to go into 3. Once in 3 runs fine. no slip etc. dropped pan for second time ...
1993 Chevrolet Lumina APV 3.1L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDU06D4P
This old timer is killing me. It came in with the complaint of stalling. It has not stalled for me but it has a very rough idle, feels lean. I opened the hood and it looks like every one in town has messed with it. Some tune -up parts hade been done. I added d... Trouble codes: 45 (rich exhaust)
1994 Chevrolet K1500 Suburban Silverado 5.7L Hesitation, LACK OF POWER VIN: 1GNFK16K3R
Did you ever want to say NOT MY FAULT! This vehicle presented originally with an EGR code. The EGR valve was replaced, code cleared and test driven without a problem. A week later the vehicle is back with a lack of power complaint. We trace the problem to a f...
1995 Chevrolet G20 Chevy Van 5.7L ABS Braking VIN: 1GBEG25K8S
Everything checks ok on this 4WAL system. No ABS codes. However, on dry pavement under medium to heavy braking conditions, ABS activates. This happens nearly every stop. The brakes all check good and all the wheel speed sensors are reading with 1 MPH of each o...
1998 Chevrolet K1500 Cheyenne 5.7L abs VIN: 1GCEK19ROW
Will keep this short and simple. We have a code C0238 wheel speed signal malfunction. While driving l/f wheel speed is 3 mph slower than r/f and rear. No matter what speed. Don't have an erratic signal just a steady 3 mph slower. Tires all match size, psi etc....
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 2GCEK19R8W
Hi there! Have a 98 Chev truck with a dead miss,missfire history blames #5 almost exclusively,#7 a few times.I pulled #5 plug and it was fouled almost shut,fuel I think(light colored deposit).I changed the plug,wire,and dist cap,but no change.Engine compressio... Trouble codes: P0141 (02 heater), P0300 (random missfire)
1999 Chevrolet Venture 3.4L abs , brake warning light VIN: 1GNDX03E9X
this venture came in with 3 warning lights, the abs, brake warning lights and an air bag light, these are the following codes: c1216 electronic brake control relay coil, ckt open c1256 lf motor circuit open b1030 rh pretens deploy loop resistance high i have s...
1999 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2GCEK19T1X
vehicle starts right up and runs good till fast idle starts to drop then idle starts rolling.long and short term fuel trim will gradually max out with o2 sensors showing very low voltage.fuel pressure is good at this time.i had checked for vac leaks with smoke... Trouble codes: 171 (lean condition), 174 (lean condition)
2001 Chevrolet Silverado 1500 4.8L Cooling Systems VIN: 2GCEK19V71
hello there,this truck came in for no heat or a lack of heat.we replaced the stat once then twice.it also sets a po128 (t-stat). i have checked the arquives and found that aftermarket radiators can cause this due to a restrictor that is missing in the top cool...
2001 Chevrolet Monte Carlo LS 3.4L Hdlights, int lights, VIN: 2G1WW12E41
Hi all you GM wiring experts, this Monte Carlo came into the shop with a list of weird wiring events, the interior lights click off and on, the headlights do the same, also the PDL's don't work, odometer goes off and on, the relays all click when theses lights...
2001 Chevrolet Silverado 2500 6.0L No Start, Starts and Dies VIN: 1GCHK29U71
I have multiple issues with this truck however the most serious one is no communication between the solus or an OTC scanner with any of the modules. Items working - Windows and door locks, head lights and tail lights, dash lights, cranks OK starts and dies, ...
2003 Chevrolet Silverado 1500 HD LS 6.0L rear rack VIN: 1GCGK13U63
I have a 2003 Chev Silverado with this quadra steering I think they call it. Never seen or worked on this system before. Friends brothers truck. I scanned it for any codes found none in engine or transmission. The only fuuny thing is that his speedo stop worki...
2003 Chevrolet C5500 Kodiak C5C042 6.6L No Start VIN: 1GBE5E1113
This truck is making me crazy, no start cold or hot without either. With scanner monitered Rail pressure, and found pressure lower than spec cranking. Replaced filter and monitered pressure, cranking went to 10 and fired. Cut open fuel filter, found black cove... Trouble codes: U1800 (Communication loose with injector control module)
2004 Chevrolet Tahoe LS 5.3L Speedometer VIN: 1GNEK13T64
I usually work on Fords so this is new to me. Tahoe speedometer reads 85mph when sitting still. When it is driven it will go past all numbers over 120mph and point straight down. It started off only doing it once in awhile. Now it is like this all the time. Th...
1998 GMC Jimmy Envoy 4.3L battery drain VIN: 1G87T13W3W
the problem is as follows :the customer drives it around its okay, it charges and starts , everything is working ok.Then he parks it overnite and it's dead in the morning.But it can also be ok for a couple of days,then it will be dead.All lites that are visabl...
1998 GMC Jimmy Envoy 4.3L No Start, Hesitation, Stall VIN: 1GKDT13W7W
Vehicle hard to start after intial warm-up. When vehicle sits for approximately 20-30 minutes, it cranks for 10-15 seconds before finally starting. If for any reason, the vehicle starts anytime immediately after turning ignition off. Vehicle starts fine cold. ...
1999 GMC Sierra 1500 SL 5.3L oil pressure VIN: 2GTEK19T3X
truck came in with complaint of losing oil pressure after startup. oil pressure normal at startup, will drop to two to three pounds in about three to five minutes. valve train rattle. pressure will return to normal after about one minute and will remain normal...
2001 GMC Sierra 2500 HD SL 6.0L wipers VIN: 1GTHC29U11
Said vehicle has an intermitent wiper problem, they work on Hi only. I replaced the wiper module because they are known to be a problem and they worked normally for about 5 minutes in the shop. I took it out for a test drive and they started back with the Hi o...
2005 GMC Yukon XL 1500 SLT 5.3L stubby shaft VIN: 3GKFK16T45
On this particular model, it is possible to remove de driver side flange without taking de differential apart? I have replaced those seals on simmilar GM products just by tapping the flange out and in some stubborn cases by means of a slide hammer. Anyone havi...
1999 Pontiac Grand Am SE 3.4L No Start, Stall VIN: 1G2NF52E0X
The car will not start after sitting for a few hours. when it does start it will stall right out, if you hold the gas pedal down just a little it will continue running and it runs well after that. Ir will not start unless you hold the pedal down a bit. There a...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac Fleetwood 5.7L oil consumption VIN: 1G6DW52P3T
the car is returning later this week to install another reman from the rebuilder. this oil usage came on so fast that it can't be considered normal. i got alot of replies saying ignore it its normal. to go from no oil between changes to three quarts between ch...
2003 Cadillac CTS 3.2L No Start VIN: 1G6DM57N83
I received only 2 replies on this request. One suggested I check for the sensor signal at the other end of the harness to reduce flexing. I think it is the flexing that is making the car start. The other response just sent me the no-start procedure from the ma...
1994 Chevrolet Astro 4.3L Hesitation, Surge VIN: 1GBEL19W7R
Well it's fixed. While there were some good responses to this problem, all had been checked already. WE had good fuel pressure, but it wasn't staying quite high enough under load. Dave [...] had what I was looking for; a fuel volume spec. His spec of 16 oz....
2001 Chevrolet Tahoe 5.3L encoder motor VIN: 1GNEK13T21
customer picked vehicle up without repair. Customer was advised problem may be in the transfer case or he needed another encoder motor. The fixes that were posted were: replace encoder motor, short in the wiring or transfer case bad. We had already replaced th...
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S92
I did recieve replies that techs that have come across this code did have success with repairing it by installing another ecm.I did get a new ecm had it reprogrammed and so far so good.Thanks to all. Trouble codes: P0601.
2002 Chevrolet Silverado 1500 5.3L Axle binding VIN: 2GCEDK19T0
Well I got this one figured out, it turned out to be the transfer case control module comanding the encodor motor into 4X4 high when there was no need for it. upon removal of the module found the is had a rattle to it, just for curiosity I opened it up and it ...
2003 Chevrolet Suburban 2500 LT 6.0L fuel sender/ gauge VIN: 3GNGK26U93
After talking with customer, he agreed to allow us to drop the tanks to do some testing. After testing found the front sending unit (the one not previously replaced) to be at fault. Thanks for all the replies!
2003 Chevrolet Impala 3.4L dash lights and lights on radio VIN: 2G1WF52E03
Hellow well i would like to thank everyone who replied,thay were a grate help. the fix was a two part fix the head light switch was bad and the bcm was bad.!!! thanks for all your help!!! jim
2003 GMC Sierra 2500 HD SLE 6.6L Alternator VIN: 1GTHK23173
Thanks for the info folks! While trying to locate the 175 amp fuse (never found it), I located the problem. In the battery cable/alternator cable junction block, somebody had installed an aftermarket accessory wire and did not install it properly or tighten th...
2005 GMC Sierra 2500 HD SLE 6.6L Hesitation, Stall, MIL Lamp on VIN: 1GTHK29215
customer took vehicle 1/21/07 and has been driving it everyday. Just like the last time the problem just went away.the customer is convinced it is fuel related. he told me that when he fueled up at a differant place and the problem cleared up.I dont think that... Trouble codes: P0299, P0401, P0404.
1991 Oldsmobile Cutlass Ciera S 3.3L Poor Idle Quality, Misfire VIN: 1G3AJ54N7M
thanks techs that responded, although already checked items did double check the way indicated by their second emails, since this is personal vehicle have not ambition yet to r&r exhaust manifold but am positive that this is the problem, at later date i will f...
1996 Pontiac Grand Am GT 2.4L Excessive Emissions VIN: 1G2NW12T1T
Hi : I sorry to tell you that we have to give up on this one,customer has limit on money and we spend enough time on it.Thanks for all the replies.
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