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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 22, 2007
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Help Request Answers
1996 Buick LeSabre Custom 3.8L electronic controller VIN: 1G4HR52KOT
we performed a water pump replacement on this vehicle. customer claims that now temp settings are showing in celsius. looked for a english/metric button with no luck. contacted local dealer who was nice enough to send over their shop manual. was unable to find...
1997 Buick Century Limited 3.1L odometer VIN: 2G4WY52M0V
please help me to figure this one. First time customer. He came in stating that 2 weeks ago he changed the battery himself and ever since the odometer displays the word "error" instead the propper milage. I scanned it with modis, no codes in tranny,ECM,BCM mod...
1998 Buick Regal 25th Anniversary Edition 3.8L injectors VIN: 2G4WF5219W
This is a strange one, we have in our shop a 98 Regal with the 3.8 - it had the supercharger melt down and caused a fire under the hood (not too bad) anyway, the customer had another 98 Olds Intrigue with a 3.8 that had rear-end damage but ran good. he had ano...
2001 Buick Century Custom 3.1L windows, odometer VIN: 2G4WS52J71
Hello all, symptoms are that the power window on the drivers side only goes down on its own after starting the car. It will not go up until you put it in gear. The odometer and PRNDL do not illuminate also.All other windows work fine. I have looked for bulleti...
2003 Buick Century Custom 3.1L rocker bolts VIN: 2G4WS52J63
since intake gaskets were replaced we have had 3 of the rocker arm hold down bolts pull out of the cylinder head. 2 rockers on the front head & #1 cylinder now on the rear head. all were torqued to 14 ft # + 30 degrees when repaired. engine ranbut rockers were...
2004 Buick Rendezvous CX 3.4L Hesitation VIN: 3G5DB03E84
car will not rev past 2500 in drive whilst driving-power drops off very rapid(not like a converter blockage), if you place in 1st gear will rev to 5500, 2nd 3500, have removed 02 sensor before converter-no better and converter temps good. tried cleaning maf an...
1985 Chevrolet Celebrity 2.5L No Start, NO SPARK VIN: 1G1AW35R7F
customer drove in on way in it died sent out service call and it started up after several attempts got it to shop and all was fine ordered parts for baisc tune up plus a fuel pump let it sit overnight and went to pull it in to shop and no start tried spark che...
1993 Chevrolet S10 Blazer Tahoe 4.3L Excessive Emissions, Poor Idle Quality VIN: 1GNDT13W8P
Fuel pressure is normal 55 psi. check fuel press. regulator for leakage ok. CPI unit is not leaking. flushed cpi unit several times per gm bul.removed plenum and visually inspected. PCM is taking away fuel. short term fuel trim is at 90 counts at idle. Have se...
1993 Chevrolet C1500 Suburban 5.7L Hesitation VIN: IGNECI6K7P
Hello everyone. This suburban came to me with a sluggish get up and go that is present on a brisk take off from a stop sign or when trying to pass. Owner has had the cat converter changed and exhaust flow checked for blockage. He has also had new plugs,wire...
1996 Chevrolet Corsica 2.2L Misfire VIN: 1G1LD5542T
hello all, i have this good ol corsica that will backfire out of the intake only when accelarating from a stop or snapping throttle in the garage. replaced plugs, wires, fuel filter. oe from factory and one plug was carbon tracking all around the porcelin. cle... Trouble codes: P0301, P0301
1997 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1GNCS13W4V
OK guys, this truck came to me milked. New coil, ign. module, cap, rtr, cts, plugs, wires, ckp snsr., harm. bal. already installed by another shop. It starts and runs good cold. It warms up and still seems to run well. After 5 or 10 mins. of driving with eng.... Trouble codes: P0300
1998 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, Hesitation VIN: 1G1JF12T2W
This vehicle will almost always pop and try to stall after a cold start. After it warms up it runs better but after a little bit of run time the vehicle will hesitate and pop(lean pop like it is running out of fuel) upon acceleration. Fuel pressure is good and...
2000 Chevrolet Silverado 1500 5.3L Hesitation VIN: 1GREC19T4Y
Truck came in with cold hard start and poor drivability cold for 1/2 mile. No codes. Seems to be running lean but I cant catch it on scanner. After 1/2 mile of driving it is fine all day. We first Cleaned the fuel injectors and it starts faster hot but no chan... Trouble codes: N0N
2001 Chevrolet Express 3500 5.7L Misfire, MIL Lamp on VIN: 1GBJG31R51
van came in the shop for engine replacement, after rebuild engine was fired up there is a miss fire i can not fix, cylinder 1 & 2 are the ones missing, i have tried all most everything diferent ign. cables, spark plugs, injectors, known good distributor,e.c.m ... Trouble codes: P0300
2002 Chevrolet Astro LS 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNEL19X12
#4 cylinder counts up on mis-fire counter, mis-fire diminishes at part throttle and under load. air checked cylinder for leakage. has some leakage. Trouble codes: P0300 (random mis-fire)
2002 Chevrolet Silverado 3500 6.0L no power rr. f. pump VIN: IGBJC34UX1
No power getting to rear fuel pump and shows false reading on guage. (.5 tank constantly)
2003 Chevrolet Cab & Chassis Silverado 3500 6.0L no fuel
hey guys a little help please.this chevy was towed in on the hook. no start condition .it it is a dual tank system .fuel gauge reading full.no fuel pressure on gauge.good power and ground at pump . removed primary sending unit. only to find an empty tank!rear ...
2003 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEC14V03
tach bounces up and down mil comes on, tach steadys mil goes out sets code p0101. Trouble codes: P0101 (mass air flow)
2004 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHC29U84
fleet vehicle keeps returning with ses light on for p0446. first time replaced vent valve due to clogged with dirt. Vehicle returned with same issue ( valve clogged with dirt) found tsb for vehicle driven in dusty enviroments. Relocated vent valve with updated... Trouble codes: P0446
2005 Chevrolet Silverado 1500 4.3L Cuts out, Stall, die intermittently VIN: 1GCEC14X95
This truck came into the shop with an intermittent dieing problem. When it did die, I found that I lost spark due to loss of power to the coil. Another shop had replaced the connector tothe coil which ended up being the problem I put on another connector and t...
1997 Pontiac Grand Am GT 2.4L No Start, Cuts out, Stall, MIL Lamp on VIN: 1G2NW12TXV
This car has intermittent no start at times it will sent one code and start and then again it will set no codes and and not start. We have seen ignition switches do this but we checked for broken wires and have done relearn for the switch . we have checked fo... Trouble codes: P0342 (cam sensor), P1629 (theft fuel enable)
2000 Pontiac Bonneville SSEi 3.8L steering shaft VIN: 1G2HZ5410Y
Happy Monday to all. I don't like Mondays but they are 1/7 of my life so I make the best of them. Customer has a 2000 Bonney with a severe clunk in steering shaft when steering wheel is turned. Noise seems to be where lower shaft meets upper at base of steerin...
2003 Pontiac Montana 3.4L Cuts out, Misfire, MIL Lamp on VIN: 1GMDU03E13
Hello Techs! Here's one that's driving me crazy. It all started 2 weeks ago. Customer complaint: CEL light on, bucking/jerking under load or accelerating, even in the parking lot in PARK. If I rev the engine in PARK to somewhere between 1500 - 2500 rpm, it wil...
2000 Saturn LS2 3.0L No Start, MIL Lamp on VIN: 1G8JW52R2Y
Vehicle brought for a problem while driving would die out, but would start back up immediately. Now stalls during warm up and will not start back up until it cools off for approximately 1/2 hour. Likewise, fuel pump is not working and we have a computer ground... Trouble codes: P1780 (PNP Switch/MIL Required By TCM), P0335 (CKP Sensor A Circuit Problem), P0621 (Generator Lamp L Control Circuit Problem)

Fixes & Summaries for GM
Fix/Summary Answers
1985 Cadillac DeVille 4.1L Ride Height VIN: 1G6CD6989F
Hello all, I have the caddy fixed. The breakthrough came when I manually energized the compressor and raised the vehicle up. I found that the controller was energizing the VENT as soon as it crossed the vehicles previous resting height. Myself, being a...
1986 Cadillac DeVille Touring 4.1L Cuts out, Stall, Misfire VIN: 1G6CD6986G
Hello all, well the majority of you had it. Engine grounds. I found 800mV drop between the battery and the engine block. The drop wasnt steady, it was all over the map just like my symptoms. To understand the effect that the ground drop had, you must ... Trouble codes: 53 (Distributor signal interrupt).
1996 Cadillac DeVille 4.6L input speed sensor VIN: 1G6KD52Y9T
Based on the info recieved it sounds like replacement of the input speed sensor is pretty important. The parts manager has talked me into doing the job which will be done when we slow down a bit. Thanks to all who responded. Mike
2002 Chevrolet Silverado 2500 HD 6.6L Hard Start VIN: 1GCHK29112
This vehicle is fixed, I however did not get to to it. GM tech put all new injectors in per GM warrenty and it runs and starts like new. Injectors were not visably bad but inconsistant injector return rates and unable to command FRP above 50mpa was the tell t...
2007 Chevrolet Silverado 2500 HD Classic LS 6.6L No Start VIN: 1GCHK23D27
Thanks to all replies, I pulled the front cover and found the cam pin sheered. It also has bent pushrods. I have not fixed the vehicle yet. I am going to put the cam gear in time and check for bent valves. The cam drive pin only a 3/16 pin. Not nearly as stron...
1991 Pontiac Firebird Trans Am 5.0L hard start VIN: 1G2FW23F4M
Thank to all the replied to my request, most of them were right with injector being at fault. measured injector and all were below 15 ohm between 12.2 - 12.6 ohm. installed new set and all's well.
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