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Prev Professional Automotive Repair Technical Discussions for June 14, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick Skylark 2.5L No Start VIN: 1G4NV54U4M
Hi Guys! What would you say if you have good spark, good fuel pressure,good compression, and every darn thing tests fine, yet you have no injector pulse? A noid light just won't light. The vehicle first came in with the fuel pump not making a sound. We shot...
1993 Buick Regal Custom 3.8L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 2G4WB54L1P
Hi everybody. This Buick is really strange. Runs poorly, stalls, sets code 18 cam/crank error, occasionally backfires on accel. Doesn't affect any particular cylinder. Have replaced crank sensor (fins on balancer are all okay), ECM (with used), ignition contro... Trouble codes: 18 (cam/crank error)
1995 Buick Park Avenue 3.8L Poor Fuel Economy VIN: 1G4CW52K1S
Customer has complained about poor fuel economy. He used to get 30 mpg and now down to 17. This was the case before as well as after the major tune up. No codes and scaned data parameters all look normal. The vehicle seems to run great the tail pipe is a littl...
1998 Buick LeSabre Custom 3.8L 3-1 wot downshift VIN: 1G4HR52KPV
bench overhauled trans for another shop. had 1870 code conv. was blue,sealing rings on turbine shaft melted. replaced turbine shaft,stator support all frictions and seals 1-2 accumulator pistons and all sprags. gave unit back with reman conv. all was good on r...
1987 Cadillac Fleetwood 4.1L Speedometer VIN: 1G6CB518XH
Vehicle came in with inop. digital speedo. tested and found vss was ok on scanner. had 5 volt square wave out of buffer to cluster. Consulted identifix and was agreed to send in cluster to local GM dealer to have repaired. reinstalled cluster, put back togethe...
1997 Cadillac Seville SLS 4.6L loss of coolant VIN: 1G6KS52Y0V
Original complaint was lossof coolant from overflow. After compression check was good we replace intake & thermostat. We also flushed radiator. this is when we started having the temp gauge shoot up when running 70+mph. It may have been doing before unnoticed....
1963 Chevrolet CORVETTE 327CID oil filter gasket VIN: 30837G1159
vehicle not used since 1976.vehicle in storage with marvel mystery in all cylinders , october 2002 drained oil replaced oil 30wgt new oil filter spin on type, pulled plugs free up engine by using breaker bar on crank bolt, then cranked over with starter. put p...
1990 Chevrolet Lumina 3.1L Poor Idle Quality, Cuts out VIN: 2G1WN54TL1
Hello everyone. need help with this one, we think we had this problem before but for the life of 2 of us we can't remember what it was. car came in on hook. plugs were fouled, got engine running by disconecting fuel pump relay and clearing plugs. reinstalled f...
1995 Chevrolet Astro 4.3L Excessive Emissions, MIL Lamp on
This vehicle has no real drivability symptoms but failed our local E-test program and had to be given a conditional pass.It was very clean on the cruise portion of the test but as soon as it came to the idle test it failed slightly rich.The shop that did the E... Trouble codes: 45 (rich exhaust)
1996 Chevrolet C3500 7.4L fuel gauge VIN: 1GCHC33JOT
replaced fuel pump because of loud noise, customer came back in to the shop and said the fuel gauge now sways from empty to full when going around corners. so we dropped the tank and installed a new delco sending unit free of charge. customer still says its be...
1998 Chevrolet C1500 Cheyenne 4.3L noise/noisy VIN: 1GCEC14W8W
This truck was towed in 11/03. The fuel pump was out @ 109,000 miles. The owner stated that it was noisy before failure. WE replaced the pump with a GM unit. The truck /owner was back in 02/04 @ 113,000 miles with a very noisy fuel pump. We replaced it, again ...
1999 Chevrolet Tahoe LS 5.7L Fuel Gauge VIN: 1GNEK13R7X
the fuel pump moduel is less than 4 weeks old it was replaced with a delco moduel. Thanks in advance for any help
2001 Chevrolet Tracker 2.0L No Start VIN: 2CNBJ13C21
Vehicle towed in with damaged engine (intake camshaft sprocket stripped and timing chain damaged). Installed used engine but vehicle will not start. Hooked up snap-on scanner and all I got was a no communication message. Went about troubleshooting and discover...
2000 GMC Yukon XL 1500 SLT 5.3L Poor Idle Quality VIN: 3GKEC16T3Y
customers wife first had no start,customer got home and started vehicle,it started ok,but had service engine soon light on and irratic idle,customer brought to us,dtc 1580 stored,showed to pass and just had 1 fail history.idle would vary from 650 to 300.while ... Trouble codes: 1580 (tac-vcm communication)
1997 Pontiac Trans Sport 3.4L ABS Module VIN: 1GMDX03E4V
This came in with ABS light on constant. Checked power and grounds and found B12, A9 to have 12V with key on. Term. C on connector 2 has power for 1-2 sec. then drops to 2.5 V. Check power at relay and find it has power from bat. and power to load side of rela...
1994 Saturn SL2 1.9L Transmission VIN: 1G8ZJ557OR
Hello everyone and thanks for the help on this one. I have this 94 saturn that was towed in stuck in reverse. The customer backed up out of the drive and that was it, would not pull out. It will not physically pull out of reverse running or not. I am wonderin...
1995 Saturn SL1 1.9L Surge VIN: 1G8ZH5282S
Hey guys and gals, Looking for a little help here. This Saturn came into our shop with a complaint of surging at idle during warm up. It is fine when it is cold and once it fully warmed up, it only does it at a certain point in its warm up. I test drove the c...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Skylark Custom 3.3L High Idle VIN: 1G4NJ51N0N
Thank you all again for your quick responses, and car finally fixed and customer happy. Here is a list of my savors...lol (in no particular order), Bob [...]. What the problem...
1993 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP53L3P
hello everyone i would like to thank you guys for all the replies i fixed the vehicle it was corrosion between the plates and the module for the ground i took it all apart cleaned the hell out of it hooked it all back up and the car started the first turn of t...
1999 Buick Century Limited 3.1L Blend door actuator VIN: 2G4WY52MXX
Well, guys, I'll try to make this as brief as possible. There were actually two problems with this vehicle. Larry & Ken both were right about the TSB. (TSB #02-01-39-001 Updated control head #[...] to address sweep calibration of actuators when power is los...
1996 Cadillac Seville STS 4.6L drivers door lock VIN: 1G6KY529XT
Sorry for the delay on the fix of this vehicle I was having trouble with my web service. I did post the fix on a update that I made but since Im in the correct place now the fix was to install the correct main relay. The dealer informed us that there was only ...
1997 Cadillac Seville STS 4.6L Cooling Systems VIN: 1G6KY529XV
ok folks, all but one or two hit it dead on, the head bolts, pulled thru, i'm sure of it! the customer may pull car back thru auction and re-sell, not sure yet. if we fix it, so much thanks to those whom responded.. john
1993 Chevrolet K1500 Cheyenne 4.3L engine VIN: 1GCEK1429P
Thank you to all of the techs who replied with quality info. I have not yet completed the veh. but recieved an e-mail stating that I used the techmail improperly. Get over it. I have parts on the way as I type and am very confident that the swap will be a succ...
1995 Chevrolet Monte Carlo Z34 3.4L timing belt VIN: 2G1WX12X65
we do not know if was revering the timing belt or the idler pullys but it is not eating the out side edge of the timing belt anymore. thanks
1997 Chevrolet Blazer 4.3L Torque converter VIN: 1GNDT13W8V
Thank you all who responded. Some said the PWM TCC regulator valve could be bad. I changed the ATF and filter before and checked pan for shafings found everything clean. Some said check the A/T fuse in the dashpanel fusebox, which I did, with KOEO I got a volt...
1999 Chevrolet Silverado 1500 5.3L Differential VIN: 2GCEK19T0X
all replies say to change switch will order switch and scan bcm befor replacement if it dosent fix will repost thank all who replied
1999 Chevrolet Express 2500 5.0L Poor Idle Quality, Hesitation, Stall VIN: 1GCFG25M9X
Well, it's fixed! The faulty part was the VCM being corroded due to water intrusion. Some helpful suggestions were cleaning the MAF sensor, checking exhaust backpressure before the converters, and of course, checking the VCM for brake fluid/water intrusion bei... Trouble codes: P0152 (o2 bank 2 sensor 1 signal high), P1106 (MAP signal intermittently high).
1990 Geo Prizm GSi 1.6L Poor Idle Quality, Surge VIN: 1Y1SL5453L
Hi All Thanks for the 4 responses that I recived. One said (open loop and not enough info) NOT RIGHT. another said (pcv?) again not right. Third and fourth said (cold start valve attached to throttle body not getting hot with coolant or bad) both were right ... Trouble codes: 13 (rpm sig).
1999 GMC Jimmy SL 4.3L day time running lights VIN: 1GKDT13WX2
hi guys thanks for all the replies. i can't beleive this is a normal condition. the customer states it never did it before. but any way it is normal and i thank you again. jeff
1963 Oldsmobile supper 88 wa 260CID rear window VIN: 635C016605
i would like to thank everyone, many replies. recived correct schmatics & repair vehicle. thank you
1997 Oldsmobile Aurora 4.0L blower VIN: 1G3GR62C8V
Hello... This was a bit fustrating since there are so few of these cars in my area and no one seems to have much experience on them. Got three replies, but no one was able to answer my question. Jerry, you were certainly right when you suggested I go with th...
1998 Oldsmobile Bravada 4.3L No Start VIN: 1GHDT13W6W
After several emails and a few gray hairs later I have finally been able to diagnose this vehicle. Oddly enough if I plugged either BCM or the ABS module in I would not have communication. I ended up replacing them both with used 'test' units to satisfy my cur...
1997 Pontiac Trans Sport 3.4L engine VIN: 1GMDXO3E5V
The van had a broken cam shaft. replaced cam shaft and bearings.
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