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Prev Professional Automotive Repair Technical Discussions for October 17, 2006
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Open Help Requests for GM
Help Request Answers
1973 Chevrolet CORVETTE 5.7L low pedal VIN: 1Z37J3S408
we need help (ideas). have vehicle with a low brake pedal. have checked for leaks, master cyl bypassing (blocked off master), pinched off brake hoses, checked wheel bearing play, free play on master apply rod, replaced proportioning valve, pressure and vac. bl...
1995 Chevrolet P-30 5.7L No Start, Surge, Cuts out, Misfire VIN: 1GDJP32K5S
I believe the magnet in the distributor may be causing the problem either weak or broken as stated before the pickup coil ohmed out good with no interuption when wiggled I have good spark from the coil just nothing coming out to the plugs
1995 Chevrolet Lumina 3.1L speedometer VIN: 2G1WL52M8S
95 chevy lumina car speedometer and odometer doesnt work, but i have vss on scanner. flow charts show to check for pulse on dk green wire (volts going below 2 volts and above 4 volts with wheels being turned). i have about 5 to six volts on the wire as needed ...
1995 Chevrolet K1500 5.7L brake pedal VIN: 2GCEK19K5S
installed new drums shoes and wheel cyls adjusted brakes and replaced master cyl with new after-market bleed system according to shop-key with power bleeder. pedal still go's to floor truck pulls to left when stopping hard. install rem calipers and all 3 rubbe...
1997 Chevrolet K1500 5.7L No Start VIN: 2GCEK197V1
I was asked to look at this truck,another shop installed the engine, couldnt get it running right, I guess I cant either, Its a Goodwrench engine. Ive lost the crank error code, truck tries to start, but its like timing is slow I cant receive any timing sp... Trouble codes: P1345 (CKP Error)
1998 Chevrolet Blazer 4.3L engine VIN: 1GNDT13W8W
i had a blazer towed in for no start and no check engine light that someone had replaced engine and couldn't get to run.found pcm fuse blown-replaced ad cel ok and here is where fun began.had code po336(crank sensor).found new pigtail and new sensor.removed se...
2001 Chevrolet Impala 3.4L Starting VIN: 2G1WF55E41
Hello fellows, Hope you can help. I think I have a faulty BCM on this car. After letting this car sit for a couple hours, sometimes over night, it won't start. No starter signal at all. Also, no interior lights such as dome lights. If we open the front door an...
2001 Chevrolet Silverado 2500 6.0L Misfire, MIL Lamp on VIN: 1GCHK29U41
I need some direction on this one. Customer complained of check engine light coming on and flashing on the highway. code P0300 was set. The missfire history showed cyl #1 & 6 as missfiring. I cleared the code and road tested on local streets and no code was se... Trouble codes: P0300 (Random Missfire)
2003 Chevrolet Silverado 2500 6.0L Misfire, MIL Lamp on VIN: 1GCGC24U13
This thing is cursed. Its got a completely random misfire. sometimes there's none at all then the next start it will miss like crazy on any random cylinders. the computer seems to respond different everytime i perform a ckp variation relearn. it will barely ru... Trouble codes: P0300
2003 Chevrolet Silverado 1500 5.3L Poor Idle Quality VIN: 2GCEC19V13
Hey guys. This truck was brought in last week with a bad alternator. We fixed the alternator and sent it out. The customer called later to say that it was still dying at idle, which of course they had not said before. I checked the codes, the only code was a U... Trouble codes: U1300 (class 2 shorted to ground)
2004 Chevrolet Trailblazer EXT LT 4.2L Poor Fuel Economy, MIL Lamp on VIN: 1GNET16S94
Vehicle has been here 3 times for same codes. First time we sent customer to Dealer for reprogram. Replaced [...] next two times. Fuel pressure is 47 psi(ok per shopkey). Was told by OEM parts dept that this eng does not have a PCV valve. Is anyone else ha... Trouble codes: P0131, P1133, P0171, P0172
2005 Chevrolet Silverado 1500 5.3L fuel tank VIN: 1GCEK14Z35
Has any of you run across this problem, I remember reading something about it in a trade mag. but we cannot find it now. This truck is slow to fill with fuel, it will take about a 1/2 hour to fill. when we first started working on this problem, it had a MIL w/...
1996 GMC Yukon SLE 5.7L brake pedal VIN: 1GKEC13R2T
This truck came in with a dropping brake pedal. When you apply the brakes the pedal sinks to the floor the brakes stay applied but it is not a good feeling to have. Performed a brake inspection and found the master cylinder was leaking between it and the vacuu...
1996 GMC C1500 Sierra SL 5.7L Stall VIN: 1GTEC19RST
i replaced the head gaskets plugs wires cap and rotor now as soon as it is cranked the fuelpump starts and does not shut off even when key is off it is washing out my cylinders then i have no compression i checked timing marks they are ok i can get it started ...
1998 GMC K1500 Sierra SL 5.7L wheels/steering VIN: 2GTEK19RXW
When driving it shakes violently (TIRES, STEERING WHEEL) at times and NOT others. I had disconnected the sensor at the P/S pump, NO change. Front end GOOD, tires GOOD. Is it possible to be the sensor at the base of the column? I have read posts with similar pr...
1999 GMC Yukon Denali 5.7L Interior lights VIN: 1GKEK13R0X
Hi Everyone I desperately need Help our main bread & butter are Imports but.. This Yukon has me going as the Interior lights have mind of there own. Sometime they work for a few hrs. as intended but most of the time they just stay on & drain the Battery. The m...
2000 GMC C3500 Sierra SL 7.4L long crank time VIN: 1GDKC34J2Y
very long crank first start of the day and long crank time on hot soak restart Trouble codes: P0339
2002 GMC Sierra 1500 SL 4.8L A/C System VIN: 1GTEC14V12
Have a problem that can't be duplicated and need to call on your experiences. After approx 2-2 1/2 hrs sustained run on the interstate A/C blower loses volume and cooling, turn off system for a few minutes then back on works fine for similar length of time. Un...
1999 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G2NE52T4X
It has new plugs, plug boots two new computers, coil cover fuel injection cleaning,fuel filter and extra 02 sensor ground at pin 21 of computer. pulled injectors out. and watched spray pattern out of car while cranking all looks good. this is a non egr engine.... Trouble codes: P0171
2002 Pontiac Montana 3.4L Cuts out VIN: 1GMDU03E02
This is a problem being worked on in a high school automech class. The customer complaint is while driving down road vehicle intermittently cuts out, customer then lets off on gas and vehicle then runs fine. We have been unable to duplicate problem and no code...
1999 Saturn SL2 1.9L tps VIN: 1G8ZK5274X
good afternoon, Good People. it appears the wiring in this saturn was attacked and gravely wounded by a lunatic with an axe. i've sorted some of the problems out but am in need of an accurate wiring diagram for the engine management. lighting and accessories, ...

Fixes & Summaries for GM
Fix/Summary Answers
1954 Chevrolet 3100 235CID crankshaft VIN: H54A005814
Thanx for all the very useful information from all who replied. We obtained the correct crank specs. and were able to correct the situation. Much appreciation to all those who contributed and Aitn.
1992 Chevrolet C3500 Cheyenne 6.5L won't shut off VIN: 1GBKC34F7N
Thanks to all who took the time to respond. This one was easy once I got the top off the pump. This system works by using a small strong sping to work against the solonoid to close the shut off valve when the power is removed from the solonoid when the key is ...
1995 Chevrolet Corsica 2.2L crank sensor VIN: 1G1LD5540S
thank-you one and all !! three had mentioned to pressurize the oil pan and blow it out. i have learned not to create more work than have planned.took off oil pan and air hammered it out.that to me is a poor design. it should not take one three hours to r&r a c...
1996 Chevrolet Cavalier 2.2L No Start, Stall VIN: 1G1JC1249T
Hey everybody, sorry for the delay in posting what I found. Everyone had some great advice to share as well as helpfull tips. Didn't find any signs of corrosion or burnt terminals at PCM connector. Pulled harness apart to look for bare wiring, or signs of 'cri...
1998 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13WXW
HI guys Well just about everyone of you were right! That new fuel pump wasn't any count. Deadhead pressure was only 42lbs. Pretty bad when even new parts are not what they are suppose to be. Thanks loads guys.
2000 Chevrolet Cavalier LS 2.2L heatercore VIN: 1G1JF5244Y
well car ended up coming back. I drained cooling system &vacuum filled syst cust took over weekend & still is doing it.I would leave request open until I fix car but 2 more days & it will automatically close. Thanks for your time
2000 Chevrolet S10 2.2L No Start, Hesitation, Cuts out, Stall VIN: IGCCS1446Y
2000 Chevrolet Impala LS 3.8L Hesitation, Cuts out VIN: 2G1WH55KXY
Thank you every one for the great info sorry about the delay we got busy and the wifes car got pushed to the back burner. Started with cleaning the mass air flow meter, the intake had been cleaned in the past, next checked all the grounds all were okay, replac...
2002 Chevrolet Astro LS 4.3L driveline VIN: 1GNEL19X52
Well, I'm posting this as a fix, although it's not 100% fixed. The vibration was diffinitely driveline, re-balancing the rear driveshaft by experimenting with hose clamp and 1/4 oz sticky weight got the vibration acceptable. We think the actual source may be t...
1997 GMC Vandura P3500 5.7L no power assist at times at idle VIN: 1GDHG31R6V
thank you for all your responses and indeed i found that i had the incorrect pump for the svo application not all suppliers show a different pump for svo steering and none svo steering gm no longer sells new pumps for this vehicle so i got a remanufactured pum...
1989 Oldsmobile Delta 88 Royale 3.8L Misfire VIN: 1G3HY51C5K
blocked-off egr valve- same, recompression tested and found 100-125 all6. finally gave in to replacing the PCM with known good updated one from wrecker- stalling fixed but still runs rough .suspected bad wire? and started ohms testing #2,4 and 6 and found I ha...
1997 Oldsmobile Bravada 4.3L Hesitation, MIL Lamp on VIN: 1GHDT13W7V
okay gentlemen this one is done. Okay first i still didnt find out why but for a few minutes i got access to the pcm by using the global obd 2 mode on my scanner for a few minutes i managed to pull a transmission solenoid A code. Basically what was happening w... Trouble codes: P0147.
1999 Pontiac Grand Am SE 3.4L ac rpm lites VIN: 1G2NE12E7X
Problem was in switch someone had replaced lock cylinder and broke wiring lock on electric replaced with gm switch cured problem thanks
2001 Pontiac Grand Prix GTP 3.8L Misfire VIN: 1G2WR52161
thanks to all who replied. the problem was fuel pump related or should i say lack of volume. replaced pump problem solved. Trouble codes: P0300.
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