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Prev Professional Automotive Repair Technical Discussions for September 12, 2007
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Help Request Answers
1995 Cadillac Seville STS 4.6L brake lights VIN: 1G6KY5296S
Hello, This caddy will sit and turn the brake lights on for about 20 seconds and then off again. It will continue to do this until you disconnect the battery. As soon as you reconnect the battery it starts in again. I thought it may be something in the securit...
1998 Cadillac DeVille 4.6L A/C clutch VIN: 1G6KD54Y4W
Anyone seen problems with A/C intermittently cooling on these cars?? Briefly cools but mostly does not. Clutch cycles on and off, but mostly off. I checked the electrical part of the circuit and found a bad clutch diode, so I replaced it, but now the new diode...
1981 Chevrolet Corvette 5.7L distribution valve VIN: 1G1AY8763B
cutomer brought car to us because he couldnt get a good peadal. found bleeder screws on left rear in wrong position .we put bleeders in proper position bleed system. wenow have adescent peadal but when pressure is applied valve switches shutting off fronthalf ...
1987 Chevrolet Cavalier RS 2.8L Hesitation, Cuts out VIN: 1G1JE31W7H
this is a speed density upgrade, this vehicle stumbles or cuts out when appling less than a 1/4 throttle. runs great on hard accell or cruise speeds. we ohmed the injectors, checked tps, map, and maf, no vacuum leaks, no intake leaks. im starting to lean towar...
1991 Chevrolet P30 7.4L jumps out of gear VIN: 1GBJP37N2M
This motorhome came in with trans. slip problems. We overhauled trans. and now during test drive it jumps out of gear. The engine backfires and revs up and trans. jumps in and out of gear. This happens in any gear selector position and at any speed. When this ...
1997 Chevrolet S10 2.2L speedometer VIN: 1GCCS1444V
Hi guys, this one is bankrupting me.. customer come in with no speedo..scan tool shows speed correct..being a common problem with clusters bad in these trucks, we replaced with reconditioned unit..still no speedo..confirmed vss signals, well within specs howev...
1997 Chevrolet Tahoe 5.7L No Start VIN: 1GNEC13R3T
This chevy is driving me crazy. You can turn it over for ever and will not start. Once you spray starting fluid in the air plenium it starts right up and runs perfect. If you shut it off it will not start unless you spray starting fluid in the plenium. Please ...
1999 Chevrolet C3500 7.4L 2000 rpm at idle VIN: 1GBKC34J0X
truck came in with hi rpm when shift into park(2000 rpm),check for codes none found.scanner data looks good,i then pulled the iac and inspect it looked ok i noticedi was compresedin to far so i pull on it little it idle fine after i put it back with the connec...
2003 Chevrolet Astro 4.3L Cuts out, Misfire VIN: 1GBEL19X93
This van came in with customer complaining of a vibration I checked it out and found the vibration to only be noticable at 60mph and higher and it seems to be worse under a heavy load. My first thought was a tire problem so I measured the tires because it is a...
2003 Chevrolet Suburban 1500 LS 5.3L electrical system VIN: 3GNFK16Z63
hi guys,weird one here.this suburban will intrmittantly stahl,shut off momentarily while cruising or at a will either start [...] up on its own or will start with key if at a stop light.when cruising the dash goes blank and charge message will
2003 Chevrolet S10 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCCS14H23
vehicle came in with intermittent rough idle, lose of power,mil light on . customer though he had gotten bad gas,(water). we ran alchol; through system and some 44k. slight help , it had original wires,cap,etc, so we did a major tuneup, more help. we performed... Trouble codes: P0304
2003 Chevrolet Silverado 3500 6.6L Hard Starting VIN: 1GBJK34153
Have researched the archives for many days. Engine seems to be taking on air. After a round of repair attempts, being fully bled, it starts right up. After running for a while, it is hard to start. I installed a piece of clear tubing between the FICM and the f...
1994 Geo Tracker 1.6L master cyl VIN: 2CNBE18U5R
dear techs. when applying brakes the padel goes down like if the master cylendar has internal leak.front & rear pads & shoes leaks any where.rear brakes adjusted right. there is a cylendar by the master & proportioning valve some thing to do with brakes....
2004 GMC Yukon Denali XL 6.0L hard start VIN: 1GKFK66U74
This thing has extended cranking when cold says the owner. Occasionally it will start and when you release the start switch it dies. The fuel pressure reg is apparently in the tank and when I checked the fuel pressure the pressure goes up to sixty and as soon ...
1999 Oldsmobile Alero GL 3.4L MIL Lamp on VIN: 1G3NL52E2X
Hello fellow Techs in the field. A good friend of mine has a 1999 Olds Alero which came in with a code PO441 of which I believe is Incorrect Purge Flow. I say "believe" due to the fact that I do not see this code in any flow chart for this model vehicle. In an... Trouble codes: P0441
2000 Oldsmobile Intrigue GX 3.5L No Start, LONG CRANK VIN: 1G3WH52H2Y
intermittantly this car will crank long before start. if open throtle slightly,will start engine. also check engine light will flash when problem occurs... have checked for fuel pressure reg leaking.. idle air operation.. replaced idle air moter when vehicle s... Trouble codes: U1016 (commuication error)
1991 Pontiac Bonneville LE 3.8L Cuts out, Misfire VIN: 1G2HX54C2M
This vehicle is missing on #3 & #6 at idle at the coil. I replaced the coil, module & computer from a vehicle that ran perfect. It does the same thing. Using an inline spark tester on all 6 coil wires #3 & #6 coils barely fire at idle. When accelareted they li...
1995 Pontiac Grand Am SE 2.3L Oil pressure VIN: 1GZNW55D0S
Thanks in advance for any help. This vehicle came in from a very reputable oil change facility (JL). Anyway, the story is after their oil change the filter leaked, they replaced it and same thing. So it comes here and the filter is actually blown (the seal is...
2001 Pontiac Grand Am SE 3.4L passlock system VIN: 1G2NP52E41
Hi folks: Car was towed to me from another shop. I found and replaced a worn out fuel pump and now car starts and runs ok. Customer says before fuel pump malfunctioned he had a no start problem with the security light flashing. The first time he had it towed t...
2003 Pontiac Grand Am SE 3.4L No Start, MIL Lamp on VIN: 1G2NF52E13
This all started after a lightning strike that took out a 2 TV's and a computer at the owners house.Car was a no start so a neighbor checked the battery and all fuses he could find.We checked the battery again and found 12.5 volts good under a load.The fuel pu...
1998 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5288W
Hi all; got this saturn with a p0446 and found the vent valve stuck closed. Replaced vent valve and a couple days later p0446 is back. I can open the purge sol and close the vent with the scan tool, passes smoke test, there is no ftp pid on my scan tool, but I... Trouble codes: P0446
2001 Saturn SL1 1.9L 2-3 shift VIN: 1G8ZH52801
This Saturn originally came in with high line pressure ans all shifts were very harsh. After replacing valve body with solenoids, line pressure is good and all shifts are okay except the 2-3 shift and the 3-2 part throtle downshift. These shifts flare up. No c...
2002 Saturn Vue 2.2L ac control VIN: 5GZCZ23D42
Replaced control head twice and ac button cuts out at different fan speeds seems like control head again, is there a problem with control heads on this vehicle, I have seen one post with this problem, are there any others who ran into bad factory heads? thanks...
2002 Saturn Vue 2.2L axle seal (right side) VIN: 5HXVX23F02
I would like to know if some has had this problem and how they fix it, thank you, Andy

Fixes & Summaries for GM
Fix/Summary Answers
1991 Chevrolet Cavalier Z24 3.1L No Start VIN: 1G1JF14T6M
Thank you for the help on this vehicle it was the fuel pressure regulator causing the problem after replacing the regulator the car will start up fine after sitting all night long.
1997 Chevrolet C1500 5.7L No Start, blows ECM fuse VIN: R9VZ109488
Most of you were right on track, but Paul and Will hit it right on the head. The (orange wire)goes to the oil pressure switch and it had shorted internally. After reading his post I tried to unplug the oil pressure switch but found that it had come apart and ...
1998 Chevrolet Malibu 3.1L cooling fan VIN: 1G1ND52MXW
It turns out the wiring in the fuse block to the bcm was actully broken. The fuse was good but, power was not getting to the circut to power the a/c throught the body computer. No where can I find actual wiring for the bcm to contorl the fan. Fixing this break...
2002 Chevrolet Monte Carlo LS 3.4L a.c. blower VIN: 2G1WW12E32
Thank you to all you replied I am now out of doghouse. I got the car to mess up and took my test light and checked all the fuses and 3 of them had no voltage all 3 came from same spot on ignition switch changed switch problem solved.
2003 Chevrolet Venture LS 3.4L No Start, Stall VIN: 1GNDX03E13
Gotta close this so here is what I know, the next day the van started and started all day. The owner took the van and has had no trouble since( must have been a magic spell or somethin')I don't know what was wrong but the owner is keeping in touch and i will u...
2004 Chevrolet Cavalier 2.2L Hesitation VIN: 1G1JC52F64
Thanks to everyone that replied. Looks like the timing chain has jumped... When I pulled the valve cover the entire upper end was all sludge! I guess you SHOULD change your oil more often that 27,000 miles!! HAHA... Thanks for all your replies!
2005 Chevrolet Malibu Maxx LS 3.5L no start/ no crank VIN: 1G1ZT62895
1996 GMC Sonoma SLE 2.2L Misfire VIN: 1GTCS194XT
We finally got the ok from the customer to tear the motor down. We found the anti-rotational bracket for the roller lifter on the #1 cyl intake valve lifter was cracked, causing the lifter to spin in the bore destroying the roller & the cam. Thanks for all ... Trouble codes: P0301, P0300 (random misfire).
2000 GMC Sierra 2500 SL 5.3L prnd321 VIN: 1GTFC24T9Y
OK this one is fixed and here what we found. First we found that the 10.5 volt reference was present on all four wires at the trans switch(4 wire connector), but then for no apparent reason the 10.5 volt signal disappeared from the GREY wire at the trans switc...
1999 Pontiac Grand Am GT 3.4L No Power VIN: 1G2NW12EXX
Well guys I am sorry to say that the car is not totally fixed. I am greatfull fo rall the suggestions. The main part of the problem was the bucking, jerking and misfireing. What cured that was the 7x crank sensor wires that go between the sensor and ignition m...
2000 Saturn LS1 2.2L no start VIN: 1G8JU52F3Y
Thanks again for every one who offer to help,majority of you said it can be done 30min relearn without tech 2. Tried it and it didn't work for me, also found other shop replace with used cylinder and key first. Tried to relearn with again after replacing with...
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