GM Automotive Technicians Technical Discussion and Fixes for Jan 13, 2004

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	Help Request	Answers
	1985 Buick Skylark Limited 2.8L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1G4XC69W5F Hi techs,this car came into shop with check engine light on (code 35 maf voltage high and 45 rich exhaust)check out maf sensor found to be bad, it would increase pulse width to 9.0 at idle and run real rich.Replace maf sensor with new ac delco part, now car ru... Trouble codes: 44 (lean exhaust always)	View
	1997 Buick Park Avenue 3.8L Engine VIN: 1G4CW5ZK5V Greetings fellow techs, Just a quick question to all you engine guys out there. We have a good customer who recently purchased a 1997 Buick Park Ave with a 3800 non-supercharged engine in it. Shortly after the purchase, the engine developed a knock in the bott...	View
	1992 Cadillac Seville 4.9L Trip Computer and A/C Controls VIN: 1G6KY53B8N Complaint is that the LCD displays for the trip computer and A/C control panels [located on left and right side of instrument panel] fade off and on. Sometimes they don't come on at all, sometimes they are OK. The functions of the trip and A/C is not effected,...	View
	1996 Cadillac DeVille 4.6L no shifting VIN: 1G6KD52Y5T This vehicle is a friends from a transmission shop that we inherited to try and figure out. They have rebuilt the transmission, installed new solenoid packs and cleaned, checked and then even installed a different cleaned and checked valve body and still now s...	View
	2001 Cadillac DeVille 4.6L 4th band, 2nd clutches VIN: 1GEED901U5 Car came in for trans message on ipc. Checked and found P1811, maximum adapt and long shifts. Checked freeze frame and found 1-2 shift was at .7sec and max allowed is .65sec. Also 3-4 adapt data was 214kpa(max adapt). The customer had just had trans serviced a...	View
	1993 Checker G20 5.7L abs module VIN: 1GBEG25K9P THE VEHICLE CAME IN WITH THE ABS LIGHT COMING ON WHEN DRIVEN ABOVE 15 MPH. oNCE THE VEHICLE SLOWES UNDER THAT SPEED THE LIGHT WILL GO OUT. I CAN NOT GET DATA STREAM WITH MY MATCO SCAN TOOL OR THE SNAP ON SCAN TOOL. CLEARED THE CODES BUT THE LIGHT AND THE CODE ...	View
	1988 Chevrolet K2500 Cheyenne 5.7L Hesitation, Cuts out, Stall, BackFire VIN: 2GCFK24KJ1 When cold, durning warm up as the temperature approaches normal operation we have extreem lean conditions during wide open throttle to the point of the engine dying. 2 additional miles and symptoms subside completely.	View
	1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L Hesitation, Surge VIN: 2G1FP22P0P Ok here we go, lol. This camaro has a ton of power and idles just fine but, @ approx. 1800-2200rpm under slight accel in high gear around 50MPH it starts bucking and surging and the LEFT INTEGRATOR shows 176 while the RIGHT INTEGRATOR shows 128; Left int. @ id... Trouble codes: 28 (Quad Driver 3 Failure Cooling fan related)	View
	1993 Chevrolet S10 Blazer 4.3L no start VIN: 1GNT13W9P2 This car is kicking my butt. It came in with a no start problem which only occurs when cold, and not all the time then. I have tested fuel pressure, spark, injectors, timing, module and coil. All check out good. If you spray a little ether in the throttle body...	View
	1993 Chevrolet K3500 Silverado 6.5L temperature gauge climbs VIN: 1GCHK33FXP Hi, This trucks heater starts to blow cold air, the temp gauge goes up to hot. The customer pulls over and the gauge goes down in about 30 seconds. When he shuts it off air bubbles in the over flow. I put a rad in last year, a new water pump, 2 thermostats. I ...	View
	1994 Chevrolet Camaro 3.4L ABS Lite VIN: 2G1FP22S4R A new customer has brought this car in complaining that the ABS lite comes on "only when cold". However during the initial road tests, no problem occurred. I have scanned the ABS Data & PCM data and found that for some reason, the wheel speeds at each speed se...	View
	1994 Chevrolet Corsica 3.1L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1G1LD55M7R Car came in with miss/buck intermitent.one coil pack,all plug wires,ignition module and ecm have been replaced. No codes found.Problem is not always there,miss/buck like it is running on 2-3 cyl when it happens.This happens more often after cold start then sho...	View
	1995 Chevrolet K1500 5.7L Abs Module VIN: 2GCEK19K0S Hello group I have this truck in the shop at this time and it has a false abs activation at low to almost stopped. I checked it for codes using my snap-on scanner and found no codes. I monitored wheel sensors while driving and found when abs activates the frnt...	View
	1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire VIN: 1G1JC5248V need some help gm guys. came in on hook. runs ok cold.as it heats up it starts to show misfire on #1 then switches to #4 then #3 bounces to different cyls. until it quits. st trim at -30 vacuum at 12-14 inches. replaced injectors and fuel press. reg. inj. puls...	View
	1997 Chevrolet K1500 Suburban 5.7L horn VIN: 3GNFK16R8V Thanks in advance. Customer is complaining of intermittant horn triggering. Last time it triggered in his driveway at 2:00 am and did not shut off untill he pulled relay. Now i tested system and everything works fine. I am leaning towards horn pad but it inclu...	View
	1998 Chevrolet Malibu 2.4L Poor Idle Quality, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1ND52T4W Vehicle came in with a burnt up converter and random misfire as well as catalyst defeceincy codes. Vehicle runs very poorly, pops and spits under acceleration and badly misfires. Found broken vacuum hose to MAP sensor and repaired with no changed. All sensors ... Trouble codes: P0300	View
	1998 Chevrolet Monte Carlo LS 3.1L Lighting VIN: 2G1WW12MXW I was wondering if there is any one who has incountered this problem before. I own this vehicle and I've had this problem lately. Occasionally, the exterior and dash lighting dims while I accelerate up to highway speeds and sometimes up to normal city speeds. ...	View
	1999 Chevrolet Silverado 1500 4.3L heater core leaking heater core, the whole dash has to come out , a very timley job. replaced with a dealer bought heater core and is leaking again in one month. no electrolis was found in the radiator. has anyone else seen this? any help would be nice before this day lon...	View
	2002 Chevrolet Impala 3.4L headlights,interiorlight VIN: 2G1WF52E42 Hello Techs,when you turn the key on,the headligts and interior ligts cut in and out and you can hear some relay clicking,the radio display dims to,soon as you pull the light switch it stops the problem,have any of you seen this before?Thanks for your help!! R...	View
	1991 GMC G2500 Rally 5.0L Speedo VIN: 2GNEG25H4M Please Need a Wiring Diag. and suggestions. Vehicle does have RWAL.	View
	1998 Oldsmobile Silhouette Premiere 3.4L convertor VIN: 1GHDX03E7W we have a ploblem with this van when at stop on an incline and let off brake vehicle will roll backwards - customer states original trans never did this - replaced original trans with jasper due to slipping - second trans lost forward and reverse after 3 month...	View
	2001 Oldsmobile Intrigue GX 3.5L steering assembly VIN: 1G3WH52H51 Hello to all, I have a 2001 Olds. Intrigue. (my personal car) I have noticed a problem with the steering/suspension. When moving I notice a slight pop or light thump coming from the front end. (crossing over bumps in the road or even road reflectors will cau...	View
	1986 Pontiac 6000 LE 2.5L No Start VIN: 1G2AG19R2G Towed in no start, flooded. Dryed out & replaced plugs.Started hard. Low fuel pressure. I replaced f-pump and now pops right off. 2 days later was towed in flooded again. I dryed it out again and it poped right off. Let sit out overnight & next a.m. connected ...	View
	1994 Pontiac Sunbird LE 2.0L Excessive Emissions, Hesitation, Stall VIN: 3G2JB51H6R This car runs fine at an idle, but when you try to come off idle it bogs right out and stalls. Originally I thought it might be low fuel pressure but it appears to be high fuel pressure. The spec,s say 40 psi we're getting 70, gas analizer shows rich, O2 shows...	View
	2000 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE52T6Y Hi Guys, I have this Grand am that came in with water in the fuel from a local fueling station. I removed the tank and cleaned it out and replaced the fuel filter and flushed the lines with my motorvac. It has fuel pressure & fire but will not start. I can spr...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick LeSabre Custom 3.8L Engine VIN: 1G4HP52L9R Hello Group, Once again being a sponsering member has paid off. I would encourage anyone who is not a sponsering member to ante up. It is the most bang for the buck you will get in this industry. The archive searches were indispensable in this repair. Now ...	20
	1993 Cadillac DeVille 4.9L Heater core VIN: 1G6CD53B3P I got a lot of response on this one. The general consensus was that the sealing tabs GM recommends for these cars builds up in the radiator and the block and plugs the heater core. Most responses recommended having the radiator rodded out, and doing a thorough...	21
	1997 Chevrolet S10 4.3L No Start VIN: 1GCCS14X3V case closed!!! little truck had a bad computer.found that if you unplugged all of the connectors except the clear one the fuse would still blow.this was the power connector.got an aftermarket computer had it flashed.SAME THING happened.fuse #9 blew.got another...	8
	2002 Chevrolet Silverado 1500 4.3L MIL Lamp on VIN: 1GCEC14W72 After checking many times the system, i had to replaced the oxygen sensor for another one. this change solved my problem because owner hasn´t come back and he phoned today me telling me his pick up is working ok. thanks all people who tried to help me speciall... Trouble codes: P0174 (fuel trim system lean bank 2).	6
	1988 Pontiac Grand Prix 2.8L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1G2WJ14W5J most everyone said shorted injecter but the customer did not want to make any more repairs so i will now know if that was the problem sorry that i could not be of more help thanks to all that offered help mike	16
	1992 Pontiac Grand Am SE 3.3L Hesitation, Surge, Cuts out, Stall Just to let everyone know, I still have not found a cure to the ongoing hesitation. Many of you suggested to remove and clean the MAF, or simply try a known good MAF. NO such luck! The ignition module, spark plugs, wires, all 3 coil packs, injectors, IAT senso...	20

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