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Prev Professional Automotive Repair Technical Discussions for April 2, 2009
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Limited 3.8L Electronic VIN: 1G4HR52K9W
When first started, temp light flashes for 5 mnutes or so. Vent light is always lit. System functions normally for 45 minutes then will start to blow luke warm air even with temp set to 90*. Unable to communicate with scan tool. Controller, HVAC control and in...
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1983 Cadillac Fleetwood Brougham 4.1L e-brake VIN: 1G6AB4785D
Hi All...We have a 1983 mint cond Caddy fleetwood, as soon as soon we start the engine the e-brake pedal releases. Everything seems in good working order, the diaphram appears to be operating properly and cannot find any switch related to this system...we prim...
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1992 Chevrolet Camaro Z28 5.0L Stall VIN: 1G1FP33FSN
customer brought car in for the car not starting after it has ran for a while. checked for spark and fuel pressure and the fuel pressure was fine but it had no spark. after replacing cap,rotor,module,distributor pickup, and ign coil the prob seemed to be gone....
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1994 Chevrolet K2500 Cheyenne 6.5L Stall VIN: 1GTHK34F5R
this veh. will intermittantly stall, whether the engine is hot or cold. no air in fuel return system,so i assume its safe it isn't sucking in air. no dtc's. ckts to fuel control solenoid are sound. when the engine stalls it is very abrubt to the point the serp...
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1998 Chevrolet K1500 Suburban LS 5.7L hard start VIN: 3GNFK16R8W
Hello all. Thanks in advance for any help. This one was brought in on the hook two weeks ago with a crank sensor code, engine was flooded etc. We checked the crank signal on the lab scope, no signal. We replaced the sensor checked and replaced the spark plugs.... Trouble codes: P1626 (pass key code)
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1999 Chevrolet K1500 Suburban 5.7L converter VIN: 1GNFK16R3X
truck came in with torque converter locking up harsh and also once converter is locked up if feels like it unlocks and locks very fast resulting in heavy drivetrain jerk. it seems to happen worse cold and once the converter locks, if you ease in the throttle a...
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2004 Chevrolet Impala 3.4L Poor Idle Quality VIN: 2G1WF52E84
Greetings GM Techs, I have a very frustrating problem here. This occurs during idle only. Cylinder #6 will miss fire every 4 seconds, when it miss fires it will last for about 5 seconds, then idle smoothly for 4 seconds, then back to miss firing for 5 seconds.... Trouble codes: P0300 (miss fire detected)
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1992 GMC K1500 Sierra SLE 5.7L Cuts out VIN: 2GTEK19KXN
Hello all. Thank you in advance for your valuable time. I have this GMC pickup here that has me scratching my head. It is a 5-speed manual trans vehicle. When the vehicle is warm, it cuts out under part to full throttle at lower RPM. When you rev the vehicle u...
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2001 GMC Jimmy SLE 4.3L No Start VIN: 1GKDT13W81
I am a Chrysler, Dodge, Jeep tech, not at all familiar with GMs. When cranking the engine in an attempt to start it, it sounds like it is too far advanced or firing order is off. We have removed #1 spark plug & brought the engine to TDC on #1 cylinder. Reinsta... Trouble codes: P0452 (Evap pressor sensor signal), P1638 (Generator F-terminal circuit)
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1994 Pontiac Grand Am SE 2.3L Misfire VIN: 1G2NE1534R
No codes shown, vehicle runs on 3 cylinders all the time. Scanning with Modis shows qdm b failure, but does not set a code. O2 shows 340-400 while engine running, exhaust is rich, but shows lean on scanner. HELP!!!
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Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick Regal GNX 3.8L Cuts out VIN: 1G4GJ117XH
still haven't fixed this car, thanks to all, checked all the basics 3 times, every fuel test known to man, ingnition system is perfect and all inputs still perfect. new ecm,crank sensor, fuel pump, module ...ect... all out of desperation. fortunatley car ...
8
1995 Buick Riviera 3.8L Hesitation, Misfire
I'd like to start by thanking everyone for your replies. As it turns out, one of the new spark plugs had a small crack in the ceramic (presumably due to improper handling), and the ignition spark would occasionally arc to the cylinder head instead of across t...
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1995 Buick Century Special 3.1L Engine VIN: 1G4AG55M4S
We released to customer with noise and no apparent reason for noise. Took all into concideration regarding the replies, and determined the noise was coming from the bottom of the engine. Probably from a wrist pin. Customer has accepted explaination for nois...
25
2007 Buick LaCrosse CXS 3.6L pressure hose VIN: MJJKMN2307
thanx brian gerald, that what we ended up doing. ordered the new nut and cut off the old one. found out from dealer afterwards that we was supposed to ordered seperately. problem was fixed with new nut
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1985 Cadillac DeVille 4.1L Excessive Emissions VIN: 1G6CD4783F
CAR IS FIXED!!! WHAT CAME IN AS A SIMPLE NOX FAILURE WENT SOUTH FAST. AFTER CHECKING COMPUTER CLOSER, FOUND PREVIOUS TECH WHO MUST HAVE WORKED ON THIS VEHICLE PUT THE BLUE AND ORANGE COVERS ON WRONG COMPUTER CONNECTORS. RECHECKED WIRING AND FOUND SHORTED CANNI... Trouble codes: E52 (pcm reset).
3
1998 Cadillac Catera 3.0L drivers side heat VIN: W06VR52R1W
Well I guess this one is fixed, but the only thing he did was open up the duct work to see what was working and what wasn't. Everything worked and is still working. The only conclusion we can come up with is that one of the blend doors was stuck and that di...
9
2002 Cadillac Seville SLS 4.6L MIL Lamp on
i want to say thanks for all the help, we retested the fuel regulator and it was not leaking at all, we replace the cam sensor wiring harness with a new gm plug, and the customer call to say everything is fine, once again thank you for the help Trouble codes: P0340, P0341.
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1988 Chevrolet P30 Step-Van 7.4L master cyl VIN: 1GBKP37W8J
YES CONNECTED BRAKE LINES ON MASTER CYL RIGHT WAY AND RE BLEED BRAKES.MOTOR HOME HAS BRAKES THANKS TO ALL
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1996 Chevrolet C1500 Cheyenne 4.3L Misfire, MIL Lamp on VIN: 1GCEC14W7T
To all that replied Thank You! I removed distributor to inspect and found little dist. wear.I then modified the hold down to make dist. adjustable and set cam timing to -5*,close as I can get and all drivability problems disappeared.Timing chain slop or slac... Trouble codes: P0300 (random misfire).
14
1996 Chevrolet S10 LS 2.2L Poor Idle Quality VIN: 1GCCS194XT
thanks to all who took youre time to helpe me.sorry for the delay,customer away,dealing with the wrecking yard!the used engine i got from the wrecking yard was just a "long block"no manifolds,valve cover,oil pan,etc.should of been my first clue.after talking t...
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1997 Chevrolet Cavalier LS 2.4L Stall VIN: 1G1JF52TXV
Smoke tested intake system and found the throttle shaft seal was leaking, replaced with used per cust request and idle fell into spec. stall prob. is gone thanks for all the replies Trouble codes: P0550.
13
2000 Chevrolet Impala 3.4L Temp Gauge VIN: 2G1WF55E5Y
Thanks to all for the help! Well I wasn't ever able to condem the headgasket, everthing else looked good too. We gave it back to the customer to drive had haven't heard from him since. If anything changes I'll update it, thanks again all.
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2005 Chevrolet Cobalt 2.2L Steering VIN: 1G1AK52F55
in my post i explained that i did not have a tech 2. Ifelt that i could not diagnose this car without a tech 2. But i was looking for a chance that someone had an idea how i could work on it with out a tech 2. most said just replace steering column. i was loo...
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2006 Chevrolet Trailblazer LT 4.2L No Start, Stall, MIL Lamp on, reduced engine power VIN: 1GNDS13S66
This intermittent issue looks to be solved. Customer has put just over 2000 miles on the vehicle since we replaced the ignition switch, without any issues. This was a tough one due to how intermittent it was. The 1 time it did not crank, we noted that our T... Trouble codes: P1516, P1682, P2610.
11
2007 GMC Yukon Denali 6.2L MIL Lamp on VIN: 1GKFK63817
I tried to contact this customer to see if this problem was returning or if he took it to the dealer or whatever. I had no luck.If he lets me know I will let you know.I don't know why IATN needs me to summarize the replies,especially when I did not have a fix.... Trouble codes: P0121.
6
2002 Oldsmobile Intrigue GLS 3.5L interior lights VIN: 1G3WX52H42
Thanks to Alex [...] for informing me of a bulletin on this problem, I was able to narrow this down and fix it. I checked the vanity mirror lights, and the rear roof interior lights, and found a chaffed wire going to ground on the passenger rear light just b...
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