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Prev Professional Automotive Repair Technical Discussions for December 12, 2006
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue 3.8L Interior lights VIN: 1G4CW53L6M
Hi There, The owner of this car states that the same day he bought this car the interior lights came on when he opened the door when he got home and would not go off ever since. He simply pulled the two 15amp fuses and the one 40amp fuse for the interior ligh...
1994 Buick Park Avenue 3.8L No Start VIN: 1G4CW5219R
hi guys, a little help is needed. this car came to me after sitting for about 18 months, no trouble codes, fuel system has normal pressure. good spark. no injector toggle but has power at the injectors with the key on. at times when i turn on the key i will ge...
1995 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP52L5S
Vehicle dropped off with complaint of stalling. Verified complaint. Parking lot turning vehicle will stall with no misfire or stumble.(CUT OUT) Customer says it also happens when turning onto side streets and has happened driving down the road at 30mph. Vehicl...
1990 Cadillac Seville 4.5L Misfire VIN: 1G6KS5331L
car wsas in the shop and we first thought the camshaft was bad, pulled cover and rockers go up / down, replace plug and wire twice compression test was between 130-150, cap look and appear O.K. Thanks for any advice
1993 Cadillac Seville 4.9L air distribution VIN: 1G6KS52B0P
air temperature is normal, but in any function ie. panel, defrost, or floor, air deflection is always from windshield and floor duct,,, all test lead to a bad acp module,, has anyone ever tried a used one with any luck ,, new part is $325.00 our cost.. any hel...
1995 Cadillac Seville STS 4.6L Dash Displays VIN: 1G6KY5298S
A liitle help needed from the Cadillac Techs out there! This vehicle is experiencing battery run-down due to the Dash Instrument cluster not shutting down key-off. Specifically, the Fuel Computer, the DIC, and the HVAC Control head stay powered up, but not oth...
2001 Cadillac DeVille DTS 4.6L engine noise VIN: 1G6KF57981
hi guys, this 2001 cadillac dts has a 4.6l 32 valve northstar engine. it came in with a misfire code, had original plugs so we did a maintenance tune up, motorvac fuel injection flush & sent him on his way. runs perfect, lots of power, no mil request BUT: "eve...
1989 Chevrolet Corvette 5.7L Excessive Emissions, Poor Idle Quality, Surge, Runs Rich VIN: 1G1YY3185K
I need a little help here guys. This Corvette came in with MIL on and code for MAF and Rich Ex. It has a bad surge at idle from 850 to 500 and its running rich. It had a miss at idle and scope showed 3 cylinders with an occasional miss. Plugs were black so I r...
1992 Chevrolet Lumina Euro 3.1L Fuel gauge stays on, alam chimes don't work VIN: 2G1WN54T7N
This is a tough one. The customer complaint is the battery goes dead if the car sits for more than a day. Additionally (and these may or may not be related) the alarm chimes don't work (we replaced the chime module and they still don't work), the anti-lock bra...
1996 Chevrolet C1500 Suburban 5.7L Driveline noise
This Suburban has a noise in the driveline between 62 and 75mph. It sounds similar to having just the rear windows on a vehicle down while driving on the highway. While driving the noise is loud in the front, quiet in the middle, and loud in the rear. You can ...
1998 Chevrolet Venture 3.4L unknown VIN: 1GNDXO3E4W
Van runs OK when cold to warm - after 10 minutes or 5 km. running and engine is warm it starts to surge erratically when driving or at idle and may also stall out. Fuel filter and pressure is OK. 1 code PO172B fuel trim sets after bucking and surging. O2, TPS,...
1998 Chevrolet K1500 Cheyenne 5.7L Charging VIN: 2GTEK19R2W
customer comes in and wants the fuel pump replaced in his p/u due to noise (it was loud). we replaced the pump with a carter complete module (new). customer picks up the p/u and comes back and say's the noise is still there. so i go on a test drive with the cu...
1999 Chevrolet Blazer 4.3L transfer case VIN: 1GNDTI3W3X
Hi, good folks. This 99 Blazer works fine in auto 4WD, but if you put it in 4HI, or 4LO, the front wheels slip. There are no codes, the pushbuttons light up normally indicating a completed shift and you can even hear the shift. It is important to note that YES...
2002 Chevrolet Trailblazer LS 4.2L compressor VIN: 1GNDT13S32
Vehicle came in with no R134A in the system. Another shop recomended to replace the compressor. I put in about 1.5 lbs of R134A and when the AC cluch kicks in, the engine rpm slows down and will stall. If i hold the rpm to 1500, when the AC clutch kicks in,...
2003 Chevrolet Silverado 2500 6.0L transfer case VIN: 1GCHK23U03
Hello everyone, thanks for taking the time to help. I have a 03 2500HD with no 4wd. When I hook-up my scanner, I have no communication with the transfer case module. I checked all fuses, I checked and cleaned ground at body mount under driver door. I have powe...
2004 Chevrolet Cavalier 2.2L cylinder slave VIN: 1G1JC12F54
hi this is my vehicle. the slave cylinder broke so the cluth pedal stay down all the time. I already bought the slave but it came with a letter that say is their a bulletin about this condition telling that replace the master that cause the slave to fail. if s...
2005 Chevrolet Monte Carlo LT 3.8L no heat VIN: 2G1WX15K04
after upper and lower intake gaskets and water pump the heater won't get hot. heater hoses stay cold. have tried differant w/p and lots of bleeding with no help. hope someone has had this problem. THANKS.
2005 Chevrolet Silverado 2500 HD 6.6L Hesitation VIN: 1GCHK29275
Hello group, This truck belongs to a good friend of mine and although it is still under warranty he is going out of his mind because the dealer has not been any help. Since new he has had to replace the fuel filter every 2-3k miles!!! The truck loses power so ...
1994 GMC Sonoma SLE 4.3L transfer case VIN: 1GTDT19W9R
good evening, got another gm t case that doesnt shift untill you unhook the battery and reset everything. it is always either encoder or control module. i have yet to come up with a foolproof way to tell which one is bad. has anyone found a system or have advi...
1997 GMC Safari 4.3L Remotes VIN: XXVB537306
Owner has purchased the orig. replacement remotes for this unit from the dealer but they are unable to program them for a week or so. Is ther a simple way to do this? Thanks
1998 GMC K2500 Sierra SL 6.5L timing VIN: 1GTGK29F2W
hi techs, customer had this injection pump replaced over a year ago, truck would not run. another shop replaced pump with new oe. vehicle runs good but check engine light was on code for boost sensor. i replaced vacuum pump was shot no vacuum, no touble codes ...
1999 GMC Safari SL 4.3L all guages and turn signals VIN: 1GTDL19WOX
We have a 1999 GMC Safari van. At times we have no guages,4 ways or signals.We checked conn. at instrument cluster,ignition switch and fuses. Looked at wiring diagram found nothing in common. Thanks for the help.
2005 GMC Envoy XL SLE 4.2L No Start, Stall VIN: 1GKET16S55
I have an 06 Envoy that was struck by lightning. The PCM, BCM, Air bag module, and 4WD module have all been replaced. I have a theft control issue. The vehicle starts and dies. The BCM has learned the Passlock code. It is PassLock code 10. The Passlock sensor ... Trouble codes: P1630 (Theft deterrent learn mode active)
1987 Oldsmobile 98 Regency 3.8L heat VIN: 1G12345689
i seem to be missing somthing on this one car came in no heat one heater hose at heater core hot the other one cold flushed heater core got good heat at hight rpm replaced core it seems to loose heat after you drive for a mile or two it also has a new stat and...
1985 Pontiac Firebird 2.8L Hesitation, Surge, Cuts out, Stall VIN: 1G2FS87S2F
basically people , i have a erratic cutout at all speeds , loads, sometimes a one time cough, and other times multiple coughs. no codes, cannot pickup any sudden errors on scanner . did notice that there is no reading on spark advance replaced the est connect...
2002 Pontiac Grand Prix GT 3.8L Hesitation, Misfire, MIL Lamp on VIN: 1G2WP12K22
Help guys, this one has me stumped. Vehicle was towed in with misfire and lack of power. Has a PO300 code in it. Vehicle starts and idles great. When you try to accelerate vehicle just falls on it's face and will not rev up. After you push the accelerater furt... Trouble codes: P0300
2004 Pontiac Grand Am SE1 3.4L brake light VIN: 1G2NF52E14
this was brought to me this morning by the customer and he stated that abs light, brake light were on and that his cruise control and remote for the alarm werent working. that all this started after dealer replaced pass lock.i found dtc u1000 and u1254 for ser...
2002 Saturn L200 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G8JU54F02
runs very rough at idle, with multiple codes as listed, excellent over the road. lt and st fuel trims are both negatives, engine load shows in the 40% at idle, map is 3.6+ volts at idle. found no vac leaks. car thinks it is under load? at idle. excellent compr... Trouble codes: P0300 (random misfire), P0108 (map high), P0107 (map low), P1599 (engine stall)

Fixes & Summaries for GM
Fix/Summary Answers
1992 Cadillac Seville 4.9L pusher fan VIN: 1GGKY53BXN
Well, our customer requested that we hookup a toggle switch on his dash that he could manually turn the fan on & off while he was driving, rather than spend anymore time or money on further diagnosis. We followed his wishes and he said he is happy with it. I b...
1987 Chevrolet R30 Custom Deluxe 7.4L Hesitation, Surge, Cuts out VIN: 1GCGR34N9H
Alrighty here was the prob. it was a combination of having an aftermarket prom chip requiring a 160 degree thermostat. it need a new fuel pump. volume was too low. put new pump in with new strainer and 160 thermostat. total about 80 bucks. fixed everything wor...
1990 Chevrolet Camaro RS 3.1L Hesitation, Cuts out VIN: 1G1FP23T1L
sorry for the late fix post. the customer can't afford to pay for this car so we have to keep it. that was the original agreement anyways so it was just 'work on it in my spare time' type thing. but thanks to all who replied. after establishing fuel control, i...
1997 Chevrolet K2500 Suburban LS 6.5L 1-2, reverse VIN: 3GNGK26F6V
hi group sorry for the long wait been feeling under the weather, another tech here decided problem was in trans so they shipped back to trans shop for them to tear apart, tech stated that he borrowed a shaffer shifter and trans still did not shift properly, wh...
1998 Chevrolet Tahoe LS 5.7L Misfire, MIL Lamp on VIN: 1GNEK13R8W
Good job guys. Thanks for all the help. All of you that told me about the valves sticking in the guides were right. Had the heads done and all is well. Thanks a lot. Trouble codes: P0303, P0304, P0305.
1998 Chevrolet S10 2.2L Misfire VIN: 1GCC1948WK
First of all ,new plugs to replace the Bosch platinums fixed the misfire problem. The owner dropped the truck off again today for maintenace and thanks to Mathieu and Joshua, replacing the cigar lighter fuse established communication with the Solus and vehicle...
1998 Chevrolet C1500 Cheyenne 4.3L No Start VIN: 1GCEC14W6W
Thanks again to everyone who took their valuble time to help. This truck had a bad coil, I found it by heating coil up with a heat gun which would give me good spark when dry. When damp out the truck had very dim & weak spark. After sitting for 3-4 hours on a ...
2002 Chevrolet Express 3500 5.7L Starting VIN: 1GCHG35R92
I have received tons of responses with alot of good suggestions. I'd like to first thank everyone for that. We still have this van but have not been able to fix it yet (We have not given up). I didn't mention the codes in the original computer were 101 & 335 s...
1994 GMC C1500 Suburban 5.7L Cuts out, Misfire VIN: 1GKEC16K3R
thanks to all for the information, you guys fixed this one!! most of you had it nailed; put in another reman distributor & she runs great for 224K miles. spark is great; not cutting out.
1994 Oldsmobile Achieva S 2.3L Head Gasket VIN: 1G3NL1536R
First of all i would like to thank you technicians for the info. Responses i recieved had indicated that the head could have been to pourous and that oil was leaking through it. Also replys about the type of gasket used(last time was a Napa set with bolts). Al...
1998 Pontiac Grand Prix GTP 3.8L Misfire VIN: 1G2WP5218W
Well we fixed this one. We told the customer to leave it with us for a couple of days so we could continue to test further with the fuel pressure guage,ignition scope, Lab scope hooked into crank sensor wire. If this thing acted up we were going to catch it. W... Trouble codes: P0300.
2004 Pontiac Sunfire SE 2.2L Excessive Emissions, Cuts out, Misfire, MIL Lamp on VIN: 1G2JB12F64
Good evening men, Sorry I can't postthis as a fix, But I'll give you a quick rundown of where we are. As for the replies I received,Roger and Allan, This newer Ecotec has only 1 coil so I couldn't swap them side to side. Ron, there are only short boots between... Trouble codes: P0300.
1997 Saturn SC2 1.9L No Start, Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1G8ZH1271V
Problem fixed . Ignition control module (which included coils)was changed . While we had it off , we cleaned mounting surface at trans housing (was coroded) and connecter plug (was clean). Thanks to all for the assist . Trouble codes: P341, P351, P351, P599, P624, P340.
2002 Saturn L100 2.2L Misfire VIN: 1G8JS54F72
Thanks to all who responded. It was a bad coil pack. I suspected it but could not confirm it untill I replaced the plug boots with spark plug wires. When I switched #1& #4 wires the skip moved to #1. A new coil pack assembly and a new module (I always like to ... Trouble codes: P0304 (misfire 4 cyl.).
2002 Saturn L200 2.2L MIL Lamp on VIN: 1G8JU54F02
Well I didn't really learn much on this one, the car has been running fine for weeks with the only additional repair after replacing the intake gasket being having saturn clear codes. Ever since then the light has stayed off. I don't know if the otc scan tool ... Trouble codes: P171.
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