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Prev Professional Automotive Repair Technical Discussions for February 9, 2005
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Open Help Requests for GM
Help Request Answers
1997 Cadillac Eldorado 4.6L intake VIN: 1G6EL12Y4V
hello, i am looking for some advice on this repair. the car came in for a small leak about (2 inches in diameter) on the customers new garage floor. he said it looked orange/yellow. we inspected and press. tested the cooling system and found some small leaks a...
1993 Chevrolet C1500 Cheyenne 5.0L Excessive Emissions VIN: 2GCEC19H1P
hello fellow techs I have a head scratcher. This pickup truck failed the IM240 for co 21.31 g/km (average passing reading 6.31)and hc 5.42g/km (average passing reading 0.63). Replaced the cat and o2 (cat was dead and o2 was very slow switching). Took vehicle ...
1994 Chevrolet K2500 Cheyenne 5.7L Hesitation, Stall VIN: 1GCGK24K5R
fire truck came in running rough and stalling.customer told me has been tuned every year since new runs good for awhile then problem comes back. scanned found O2 switching slow replaced no change checked fuel filter replaced checked fuel pressure within spec c...
1996 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M3T
costumer does not notice any drivablity issues,only check engine lamp comes on driving intermittently Trouble codes: P0101, P0140
1997 Chevrolet Tahoe LS 5.7L No Start, Hard crank VIN: 1GNEK13RXV
This 97 Tahoe was towed in 2 days ago. Cranks won't start. Please keep in mind that I have not been working on this myself, this info is what I have been given from my tech, and what I have gathered when "hovering". Vehicle has spark, 60 psi fuel pressure, vol...
1998 Chevrolet Blazer 4.3L No Start, Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GNCS13W4W
vehicle was towed in when we first checked vehicle out vehicle cranked with no comprestion on four cylinders we recommended a motor cust. approved work installed used motor with 35,000 miles aftermotor was installed vehicle would not start on its own to get it... Trouble codes: P0122, P1122, P0300, P0101, P0107, P0108
1999 Chevrolet Tahoe LS 5.7L Steering VIN: 1GNEK13R1X
We have this Tahoe driving us nuts.Came in awhile back for vibration in steering wheel,felt just like a slipped belt in a tire.We replaced all 4 and aligned.We thought problem was cured,or at least remedied enough where customer didnt complain about it.That wa...
1999 Chevrolet Cavalier LS 2.2L Poor Idle Quality, Misfire VIN: 1G1JF5248X
Thanks for any help received! This vehicle misfires only in cylinder #1. The compression is 170psi. On the scanner you can see the misfire data for all cylinders and it only shows it misfiring for #1 cylinder. Vacuum readings are good. We thought that it might... Trouble codes: P0301
2000 Chevrolet Suburban 1500 LT 5.3L Excessive Emissions, Misfire, MIL Lamp on VIN: 3GNFK16T3Y
Help!!! I've got this suburban that shows misfires on #1&6. I've checked backpressure and found none. No regulator leaking. I've swapped coils and wires. All injectors drop same pressure. Mis only happens between 2000 and 3000 rpms. The only way i know theres ... Trouble codes: P0300 (p0420-), P0420 (p0430-), P0430 (testing and results)
2001 Chevrolet Silverado 2500 6.0L Torsion Bars VIN: 1GCHK24U81
Hey everybody, I've got an '01 2500HD equipped with a snow plow, the customer complains that the front end sits too low with the plow on it. The customer wants the torsion bars adjusted. We've done some checking and have heard that the bars are adjustable 4 to...
2002 Chevrolet Silverado 2500 HD 6.6L runs on own
Problem I would have is that intermittently the truck would not shut off with the key. You would have to go out to the under hood fuse box and pull the fuse or relay that powers the engine pcm(diesel). Important to know that this truck was hit in left front an... Trouble codes: U1000, B2961
1991 Geo Storm 2+2 GSi 1.6L No Start, Cuts out, Stall VIN: J81RT235XM
compression good 150 accross timiing belt on marks,spark good, injection good, but will not start unless we crank dist to one side moved wires on cap ran better but still stalled set up cams and crank dead nut in time but rotor out 90 degrees and it starts put...
1994 Oldsmobile Cutlass Ciera 3.1L Misfire VIN: 1G3AJ85MXS
This vehicle will pop back thru the intake / plenum at random, only in park/neutral. Tested mass airflow, secondary ignition. park neutral switch, changed out ignition module/coils with known good. Looked at history fixes in tech help section, saw 1 post with ...
1996 Oldsmobile Cutlass Supreme SL 3.1L radiator VIN: 1G3WH52M8T
Hello all, need some advice on this car we had in for normall service, and found engine oil in top of radiator-oil was down one quart, but is 1,000 miles over service. No other symptoms, engine runs great. It has VERY little condensation in oil cap and PCV. Ca...
1999 Pontiac Grand Am SE 2.4L Service Vehicle Soon VIN: 1G2NE52T1X
The BCM was replaced in this vehicle 2k miles ago and now it has a B1001 code and the Service Vehicle Soon light is on. When we replaced the BCM we completed the passlock auto learn procedure and had no problems or codes remaining. Using a Tech 2, we cannot fi... Trouble codes: B1001 (Option Configuration Error)
1992 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5473N
I thought that replacing a bad CTS would take care of the rich condition code 45, but it has not?? The O2 voltage will switch fine at cruise but as soon as the throttle is returned to idle the O2 voltage goes high and it goes open loop. I tried pulling the PCV... Trouble codes: 45 (O2 Rich)
1998 Saturn SL2 1.9L Poor Idle Quality, Misfire VIN: 1G8ZJ5275W
car driven by used car lot for several weeks, parked a few days. Started with an obvious misfire. Several codes including misfire. Cleared codes and misfire code came back. Found plugs fouled and replaced. still misfire. Found cylinders 1 & 4 to have no spark....
2000 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5277Y
Has DTC P0442,I ran service bay test with tech2, and it passes the monitor. After cold start drive fails evap monitor. Leak test with Waekon, holds 10in.h2o for hours. Trouble codes: P0442

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Roadmaster Estate Wagon 5.0L heater control valve tubes VIN: 1G4BT5374N
everyone said to ground the heater control valve tubes it was bolted to the firewall but so i grounded it in a couple of other places flushed cooling system again and send the car off on its way again time will tell if its fixed i will let you know if i find a...
1991 Chevrolet R1500 Suburban Scottsdale 5.7L no spark VIN: 1GBER16K3M
Thanks for all the info from the 23 that replied . it end up being the coil the customer installed was bad and the new one installed was also bad customers was a checker brand the one insalled was a wells. Those that said even though its new dont trust it made...
1993 Chevrolet Cavalier RS 2.2L door locks and defrost switch VIN: 1G1JL5444P
fix for the defrost switch was new control unit $120.00 for a 5.00 switch, oh well. fix for the door locks was left drivers lock acuator was frozen with rust. didnt get a lot of help on this one from members had to hash it out the hard way, better luck next ti...
1996 Chevrolet S10 LS 4.3L Cuts out, Misfire, Poor Fuel Economy VIN: 1GCCS19X3T
im sorry that the information was so sketchy, some times i feel like im running i circles... i replaced the o2s and plugs are clean now i hope that takes care of it..time will tell. i don't know weather this affected it, but positive cable was loose also. than... Trouble codes: P0300.
1998 Chevrolet Malibu 2.4L waterpump
Thank-you for all your responses. The consensus seemed to be that it was the head and/or gasket. Since I already had an ok to remove, I did. Many techs said that they had not seen a water pump leak into the motor, but when I took the head to the mmachine shop,...
1998 Chevrolet Express 2500 5.7L axle VIN: 1GBFG15R4W
We found that both axle shafts were of the same length. We put side by side but from opposite ends and rolled next to each other and they always touched. Since both were parallel to each other, we swapped axles from side to side, but vibration was still there....
1998 Chevrolet Astro 4.3L rotors VIN: 1GCDL19W3W
swapped rotors, pulls the other direction, installed new & problem gone thanks for the help
1999 Chevrolet Cavalier 2.2L engine VIN: 1G1JC124XX
i want to thank everyone for thei help. i went into work today to try some of the things that was recomended that i havent tried yet. first thing i tried was recomended by robert of illinois. i bypassed the heater core since that is the only way coolant flows ...
2000 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GCEK14T1Y
thanks to all who replied to this request. the fuse for the cig. lighter was blown due to the customer pluging in a shorted accesory plug into it. replaced the fuse and got comunication between scanner and pcm. we checked for intake leaks with propane around i...
2001 Chevrolet Impala LS 3.8L temp gage VIN: 2G1WH55K61
thanks for the replies, replaced thermostat and working ok since
2001 Chevrolet Silverado 1500 4.3L No Start, Cuts out, MIL Lamp on VIN: 2GCEC19W21
final fix notes cam retard of -11 degres. had to reset by slotting distributor hold down. scanner would not reset this electronically. engine performed much better. however extended crank restart still was a problem. final fix was replacing fuel pump. there wa... Trouble codes: P0300.
2002 Chevrolet Venture LS 3.4L fuse box VIN: 1GNDX03E92
after a few days of pulling on wires and checking for voltage loss we found that the fuse connector for the pcm/ pass key had a very loose cavity connector, it was a weird thing that you could pull on the wiring three feet away and the van would shut off, that...
1995 GMC Safari 4.3L Misfire VIN: 1GDDM19W4S
Sorry about taking so long to get back on this one. I haven't gotten to the root of the problem yet. I spent a whole day going over everything that Iv'e allready done. I did a snap acceleration compression test and results were 150 to 175 psi. I can't seem to ... Trouble codes: 36 (idle air control).
1987 Oldsmobile Delta 88 Royale Brougham 3.8L Stall, MIL Lamp on VIN: 1G3HY5133H
Many thanks to all who replied.The problem was the rebuilt maf sensor.Lab scope readings on old sensor at idle was about 3 hz,the new sensor was somewhere around 60 hz at idle. Trouble codes: 34 (maf sensor).
1999 Oldsmobile Intrigue GL 3.8L Accessories VIN: 1G3WS52KXW
Sorry it took so long for my responce but I wasn't sure how to respond until I got the notice from iatn. Any way what I found was when I went to remove the motor to replace the wiper cover their was a metal stop that was bent out of the way of the lever on the...
2001 Pontiac Grand Am GT 3.4L head lights VIN: 1G2NW52E51
This Pontiac is fixed, wiring trouble inside relay fuse center under hood. Both the feed and ground wire terminals where loose overheated and burnt. We found the problem by wiggle test at all locations. When we shook the harness under the buss box lights would...
2001 Pontiac Grand Prix GT 3.8L right front wheel bearing VIN: 1G2WP52KX1
Thanks for all your help everyone. I replaced two wheel bearings the right front and the right rear. I then ran two grounds .One on the drivers side One on passenger side. Hopefully I won't see this vehicle again.Thanks again ED
1995 Saturn SL2 1.9L No Start VIN: 1GCEC4F254
Thanks to all that replied. F5 terminal at fuse panel was slightly melted. Advised customer of needed repair did not want to spend the cash at this time. However, cleaning and putting fuse panel back together seems to be okay for the time-being. Customer will ...
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