GM Automotive Technicians Technical Discussion and Fixes for Aug 3, 2005

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Open Help Requests for GM

	Help Request	Answers
	1992 Buick Riviera Luxury 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G4EZ13LXN hello all i have a riviera 3.8 that only gives me a problem after the car gets warm, once i get the car good and hot it would buck and shutter like the problem witn a tcc lock up. the only concern, is that it happen in park, drive, rev. or neutral. so i pick u... Trouble codes: 47 (uart link problem)	View
	1994 Buick Century Special 2.2L Speedo, Fan,temp Lt VIN: 1G4AG5540R Can anyone help me find the correct PROM for this vehicle? The PCM # is [...]. Prom ID 8167-BJLT Part#[...]. Speedo incorrect, temp light, fan always on. The problems are internal in the PCM, but not the PCM. I think it has a damaged or wrong PROM(it has...	View
	1987 Cadillac DeVille 4.1L Display VIN: 1G6CD5186H This Caddy came in with a Service Engine Soon light on, climate control display said 6, climate control was blowing ambient air out dash vents & not responding to any commands, fuel info center display said 6. Our scanner did not retrieve any codes. The self d...	View
	1998 Cadillac DeVille 4.6L engine VIN: 1G6KF549XV car came in with overheating problem driving around town, while driving car is fine, stop and set for a few minutes and car gets hot. no leaks in system, no cumbustable gases in cooling system. replaced thermostat again, no change. customer picked up car and s...	View
	1999 Cadillac Seville STS 4.6L ebtcm VIN: 1G6KY549JX Hello again. I've got this STS and the traction control light and ABS light will come on intermittenly. 2 weeks ago I pulled a total of 28 different codes out of all computers. Talked to another mechanic and was told to replace the PCM. Had PCM replaced and re...	View
	2003 Cadillac Escalade 6.0L pistons VIN: 1GYEK63N93 Thanks to all that take the time to help. I have replaced the engine in this Escalade due to a piston breaking apart at the wrist pin area. The customer has maintained this vehicle like clockwork. He would like to know if this is habitual problem with this eng...	View
	1989 Chevrolet S10 Blazer Sport 4.3L No Start, Stall, smokes ignition coil VIN: 1GNCT18Z0K We have this "89" S-10 blazer that was towed in as a no start. We found a smoked ignition coil. We installed a new coil and it fired right up. We then checked voltage to the coil and everything seemed to be good. We then changed the cap, rotor and plugs (they ...	View
	1991 Chevrolet Topkick 427CID Poor Idle Quality, Hesitation, Stall VIN: 1GD57HAM3M Hello techs, I have this Topkick in my shop which came in with fire damage at the passenger side of the TBI. As GM was unable to supply a new harness, I ordered and installed new plug ins for the EGR, TPS, IAC, Temp sensor and OP sensor. These units were all r...	View
	1994 Chevrolet Impala SS 5.7L Starting VIN: 1G1BN52P1R good evening. this impala came from another shop. they said that it will die and then will not crank and has no injector pulse. i pulled a maf code(48) and a pass key fault code (46). for two days i've driven it but couldn't get it to act up until closing time...	View
	1998 Chevrolet Cavalier Z24 2.4L timing chain VIN: 4G1JF32T1W when warming up after water pump change noise started from timing chain area. sounded very much like the chain tensenor lost its prime and let the chain come loose and started making noise. so we repositioned and retorqued tensioner and noise went away for abo...	View
	2001 Chevrolet Impala 3.4L level senser VIN: IG1WF52E21 over a year ago customer had a coolant leak we found intake manifold leaking at the corners..we replaced the gaskets and flushed the cooling system..custmer retuned saying the low coolant light comes on and off now and then we cked the system was full and had ...	View
	2002 Chevrolet Impala 3.4L battery VIN: 2G1WF52E92 Hello, We have this 2002 impala with a key-off drain. After vehicle times out and goes to sleep (approx. one hour), we still have 1.2 amps drain. Dis-connecting radio in vehicle brings drain to 400mA, also radio remains hot (temperature) in this vehicle hours ...	View
	2003 Chevrolet Express 3500 6.0L belt VIN: 1GBHG31U73 HEY ALL could use a little help here. Have this van that will brake the compressor belt on hot days every once in a while. First time installed new belt, worked good for two weeks then broke belt. replaced belt and tensioner worked good for a week. Driver say...	View
	2000 GMC Jimmy SLS 4.3L temperature VIN: 1GKCT18W2Y i flushed the coolant last summer and replaced the t-stat. the coolant was brown and lumpy. It fixed the overheating, until now. I performed a tsb involving flushing the entire system with a GM product, to remove scale and rust. I refilled with Dexcool and it ...	View
	2001 GMC Yukon XL 1500 Denali 6.0L a/c compressor VIN: 1GKFK66U11 the truck came in with a broken a/c belt to us. we installed a new belt and watched the tensioner move back fourth rapidly. upon further inspection we noticed the stop on the tensioner was broken. so we replaced the tensioner. it work fine for about 3 hours of...	View
	1996 Pontiac Grand Am SE 2.4L Poor Idle Quality, Surge, Stall VIN: 1G2NE12T1T Hello GM Super Techs. Need some help. This Is my moms car, so have to get fixed ASAP. Started acting up few months ago once in a while. Now happens every time when started cold, and depends how long it sits when shut off hot it might do it. Start car and withi...	View
	2001 Pontiac Grand Am SE 2.4L lights on instrument panel VIN: 1G2NF52T81 i have a grand am that was possibly struck by lighting according to my customer while he was away on vacation.the problem i am having is all the following lights are on on the dash- service engine soon, abs,cruise,trac off,service vehicle soon. i have a code u...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre Custom 3.8L Hesitation well i was suprised to see this one gone when i got to work today, the boss cleaned the maf and throtle body and was happy with the results, so the day was spent in a mad dash to try to square away some other projects before i'm gone tomorrow for my wife's sur...	8
	1999 Buick Park Avenue Ultra 3.8L power door lock VIN: 1G4CU5218X Greetings, Thanks to all who replied,the vehicle was test driven,parked,ignored etc. for a week and never duplicated customers complaint. I suspect a bad actuator under certain conditions,but could not verify.Will update if anything pops up. cordially To...	4
	1996 Chevrolet K1500 5.7L Poor Idle Quality, Hesitation, Misfire hello, well i finally fixed this bugger. just about all replies said regulator or injectors. i ordered an upgrade injector assy. from linder. although i could not really see the reg. leaking. or what changing the intake did? oh well i know im not the only one ...	14
	1997 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W1V Thanks for the 2 replies that I had. Unfortunately there was not a ground on this thermostat housing so that was not the fix. I ended up reflashing the computer. It had never been done, and there were several updates that it needed. After the flash, all worked... Trouble codes: P0117.	4
	1998 Chevrolet Blazer 4.3L Transfercase VIN: 1GNDT13W8W Thanks for the replies. When the Blazer first came in the atc(auto transfercase fuse) shift motor fuse was blown. Initial check found motor winding resistance at 1 ohm. I replaced with a known good unit and measured winding resistance before installation; 8 oh...	5
	1998 Chevrolet Express 3500 LS 5.7L AC System VIN: 1GAHG39R0W The van came back with poor cooling again & this time adding freon didn't help. Low side pressures were 80 & high side 300+. We made a diagnosis of a stuck rear expansion valve. We replaced the rear expansion valve & refilled the unit, fully expecting them to ...	25
	2000 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCDT19W6Y I returned the vehicle to the customer because of time limitations. We will get it back to do a smoke test. Customer just talked with me recently, said the light was on yet but whatever we had done, it had greatly improved his gas mileage. We do work for this ... Trouble codes: 0452 (Fuel pressure sensor circuit - low voltage).	2
	2001 Chevrolet Astro LS 4.3L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1GNEL19W21 It appears this was an electrical problem, I received three responses saying to check electric. One said to check connector at IAC and two said to check for damaged wiring by steering column and AC hose. I did find a wire that was damaged by the column. The br... Trouble codes: P0506 (low idle).	20
	2001 Chevrolet Tahoe 5.3L don't know VIN: IGNEK13T51 Hey, I really appreciate all the advice I rec'd. It ended up with the customer taking the vehicle back to the used car dealer, so I took him all the tech advice I had rec'd. He's a pretty good guy. He replaced the steering sector and the sensing unit on the pu...	9
	2002 Chevrolet Impala LS 3.8L security VIN: 2G1WH55K42 Didn't really fix car yet, but this seems to be easiest way to close out help request. 99% sure it is BCM, but customer doesn't want to replace it yet!! Funny part is, cust. called back on tuesday, no start happened again; I'm sure it will come in on the hook,...	4
	2003 Chevrolet Tahoe LT 5.3L horn honk VIN: 1GNEC13Z43 Thanks, to all for the info provided. I have been unable to repair vech at this time. dealer says it can't be done. I am in the process of getting my factory radio and reinstalling it to try programming through radio and door controls. Also got a new Modis by ...	6
	1996 GMC K1500 Suburban 5.7L Heater control VIN: 1GKFK16RXT HI everyone! Had some great ideas - some that I had tried (should have posted more of what I did) Including air flow thru evap, etc. I tried running the AC when vehicle started cold and found that the outlet temp had dropped to 46 degrees - So no brainer - hea...	8
	1997 GMC C1500 Sierra SL 5.7L tcc VIN: 2GTEC19R0V Sorry for the delay in posting the fix. To be honest, I went on vacation and forgot all about it. Anyways, thanks for all of the great info from all that replied. It turns out that having some negative slip is normal and can be expected. After talking to the t...	6
	2000 GMC Sierra 2500 SL 6.0L sticking throttle VIN: 1GTGC24U8Y thanks for all the tips, Epecially the GM bulletins on this. After a thorough removal and cleaning, it has for the time being been resolved. Thanks guys!	23
	1992 Oldsmobile Cutlass Ciera 3.3L Excessive Emissions VIN: 1G3AL51N5N thanks again for all the help. most explained about running lean and e.g.r. problems. but I forgot to mention car not equipped with e.g.r. valve. I performed a pre cat test and my numbers were co .6 o2 .7 hc 110 and nox was 2000. suspect an oem cat would have ...	9
	1999 Oldsmobile Cutlass GLS 3.1L Misfire, MIL Lamp on VIN: 1G3NG52J9X thank you for the replies,this car is fixed.a couple guys said to check the alternator,it was fine,even unplugged it still had misfire,we replaced the intake manifold gasket,because we saw a small leak(antifreeze,of course)i dont think it would be possible for... Trouble codes: P0300.	16
	1983 Pontiac Firebird 5.0L Hesitation VIN: 1G2AW87S6D thanks to all who responded to this help request. after checking and double checking all inputs and several ouputs to and from the control unit i purchased a control unit. so far the problem appears to be gone. this car is my daily driver so time will tell. th... Trouble codes: 44 (lean).	7
	1999 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2SB1244X thanks again to all that replied. the idel speed motor was stuck due to the broken air cleaner lid allowing dirt into the throttle.cleaned the plate and the idel motor replaced lid and air filter and all is good!	5
	1996 Saturn SL2 1.9L horn VIN: 1G8ZK5279T If I had only looked at the wiring diagram I would have seen that the relay is inside the horn. That's what happens when you assume. All responses were right. The problem was the horn itself. Thanks for the help.	5

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