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Prev Professional Automotive Repair Technical Discussions for December 16, 2009
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Open Help Requests for GM
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2002 Buick LeSabre Custom 3.8L Poor Idle Quality, Cuts out, MIL Lamp on, P0449 VIN: 1G4HP54K92
We just replaced the transmission in this 2002 3.8 LeSabre Custom. (It's my Wife's car so, I really have a vested interest in getting it straightened out!) The engine idles fine after a cold start, the rpm drops normally as it warms up but, once down to about ... Trouble codes: P0449 (Evap System Vent / Solenoid Valve Malfunction)
2000 Cadillac DeVille DTS 4.6L Steering VIN: 1G6KF5794Y
Hi; 2000 Deville DTS. Came in for an engine swap. Dropped the cradle and swapped the engine. Used original steering rack, rotors wheel speed sensors. When took for test drive, Steering wheel was 180 degrees out. Was able to unhook steering shaft and rotate. N...
2003 Cadillac DeVille 4.6L no communication VIN: 1G6KD54YX3
customer states that windows were inop, dash inop, would not start or except jump start. customer replaced batt and was able to drive in. i found communication codes in all 19 modules. also found the positive batt lug was loose and screwed in on angle. i remov...
1991 Chevrolet Camaro Z28 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire VIN: 1G1FP33F9M
Hello everyone, this car is giving the shop fits. this car came in for us to get it through emissions, high hc. We found that the egr was not hold vacuum, replaced it. found plug wires and cap and rotor were bad, replaced along with plugs. did a fuel injection...
1994 Chevrolet S10 Blazer Tahoe 4.3L No Start VIN: 1GNDT13W3R
truck came in with a no start problem.found no fuel pressure.replaced fuel pump and strainer.have 60 psi when trying to start.truck will not start inless starting fluid is sprayed in throttle body and then runs good.still has around 60 psi fuel pressure.but if...
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 1GCEK19R6W
this truck starts up fine, idles fine, as it warms up it slowly looses power in which it won't rev up. the maximum rpm's it will go keep decreasing to it finally won't rev past 3500 rpm's. when it finally reaches max rpm it breaks up and sometimes pops under i... Trouble codes: P0171
2000 Chevrolet S10 4.3L 4wd VIN: 1GNDT13WY2
i have a blazer with no 4wd, selector switch does not light in any position,fuses are all good. checked selector with vantage meter, resistance values are correct for each button pushed.power and grounds ok.my scanner will not communicate with transfer case mo...
2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: IGNCS18W3Y
have a p1345 code, have checked distributor at tdc and the button is pointed at the 6 on the housing. it idles good. have moved the distrbutor and still the same code.this is the edi ignition system. Trouble codes: P1345
2004 Chevrolet Silverado 2500 HD LS 6.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GCHK23U44
Can any one help me with this one? I have got a miss at Idle that I just cannot seem to nail down. I have ran through all the basics and just cannot find any answers. I thought it might be from the contaminated gasoline that had diesel in it. But after two fue... Trouble codes: P0300 (Multiple cylinder misfire)
2006 Chevrolet Silverado 1500 LT 5.3L battery VIN: 2GCEC13ZX6
This vehicle has a new battery,the alternator charges at 14.1 volts and has no aftermarket equipment installed and nothing is plugged into the 12 volt outlets.The battery goes dead (1.9 volts)overnight.I did a current draw test which it failed miserably.It rea...
2006 Chevrolet Colorado LT 3.5L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1GCCS14666
This Chevy came in with a lite on and surging and hesitating. Code p0017. I changed the CMP and CKP but there was no change. I checked the variable timing solenoid out of the truck but it appeared to be working ok. It looks like I may have to replace the varia... Trouble codes: P0017 (CKP-CMP Correlation), P0300 (Misfire)
1997 Geo Metro 1.0L No Start, Poor Idle Quality VIN: 1GF73TS345
hey guys i have a 97 metro this car will run great everywhere except idle fuel pump was replaced for no start got it started and the only way it will run is off idle i put a good known injector in but still no go regulator is good . anyone seen this before on ...
2004 GMC Sierra 3500 8.1L ABS Module VIN: 1GDJK34G14
Hello everyone & thanks in advance! I have an 04 GMC 3500 dump 4x4 with 8.1L and the Allison. I have at key on, ABS light, followed by brake light and warning chime for about 20 seconds or so. Lights stay on and brakes work fine, obviously with no ABS function...
1997 Other GM H1 6.5L Electric VIN: 137ZA9036W
Had engine replaced at 42K, now has 47K. Problem began with stalling intermittantly at 2500-[...]. Owner said seemed like it ran out of fuel & unable to get started. Blown ECM fuse & will start but fuse continues to blow. Need to find wiring diagram to trac...
1999 Pontiac Sunfire SE 2.2L n/a VIN: 1G2J85248X
This car will not start Intermittently, seems to be more common in colder weather. Theft light flashes and there is a code P1629. I have checked everything vissually ( wires,connectors etc.) all looks good. Customer just waits approximately 10 mins then car wi...
1999 Pontiac Grand Am SE 2.4L No Start VIN: IG2NE12TOX
intemiitent no start, it starts runs fine, after about three minutes i notice a little vibration in the motor, not a missfire. all looks good on a modis fi pw is 1.8 at idle no resyncs, no codes. now the fun part. shut it off and it will not restart immedatly....
2006 Saturn Ion-3 2.4L ignition
2006 saturn ion... when the key is turned to the off position it can not be removed... if you slam the shifter hard several times it may release

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Regal GS 3.8L No Start VIN: 2G4WF5214X
Thanks for all of the advice-wow! I got a lot of responses. We tried many of the suggestions. Many people suggested that it was a security system issue, but it was not. Probably the best indicator of that is the fact that the car died while driving. As s...
2000 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52J3Y
The problem turned out to be a intermittent short in the heater power supply (pink) wire for the rear o2. The wire harness that runs in front of the oil pan up & over the engine cradle splits off to transaxle speed sensor then goes to rear o2 was rubbing on... Trouble codes: P0133, P0135, P0141.
2001 Cadillac Seville STS 4.6L Cluster VIN: 1G6KY54951
Thanks Everyone for the great replies. Come to find out, according to my GM parts dept, this car has had 6 replacement clusters. They offered to send me a replacement, but said that was it no more..., if it dont fix it you have something else wrong. With th...
1996 Chevrolet S10 4.3L Air bag light VIN: 1GCCS19X1T
We bought the air bag dignostic information from Mitchell on line. With that and the wiring information we determined a failed Air Bag Arming Sensor, GM #[...]. This sensor is located midship on the frame, drivers side, near the fuel filter. The part is no...
2000 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCEC14W6Y
Hello and thanks for all the great pointer, you were all very close. I disconnected both the 02 sensor's befor the converter and vehicle ran great with no misfires. I guess what threw me off was the fact that I have never seen plugged converts give me the read... Trouble codes: P0300 (Random Cylinder misfire).
2001 Chevrolet Impala 3.8L Lighting
It turns out the new turn signal switch my customer ordered (online) was defective. All the turn signal lights work now. I remember telling him to order the good one from autozone but he had to save money with the 100 dollar part. the bad news is i wasted an e...
2005 Chevrolet Uplander LT 3.5L Fac DVD player VIN: IGNDV33L35
This can not be done with another factory player. Thanks to all
2006 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S86
Bryon and Steve hit the nail on the head. A new pcm repaired the problem. Thanks again. Trouble codes: P2135.
2007 Chevrolet Express 2500 6.0L cluster VIN: 1GCFH15Z37
Thank you for the replies,this vehicle is a sherriffs van and take note that these vehicles are washed inside out every three weeks and what we found was one wire from the fuse box under the drivers seat that goes to the bcm lost power. we ran a wire directly ...
2007 Chevrolet Express 1500 LS 5.3L MIL Lamp on VIN: 1GBFG15TX7
i finally got the customer to leave it last night. i did some more testing without the customer on my back and found that the control(ground) side of the sensor heater intermittently shorted to ground when i wiggled the harness near back of engine block. this... Trouble codes: P0050, P0059.
1997 Geo Metro LSi 1.3L Stall VIN: 2C1MR2298V
Replaced the fuel pump and still had the same issue. Was looking down the throttle body while the vehicle was acting up. Noticed that the TBI Injector appeared to be intermittent. Checked pulse with of the injector and that looked good. Replaced the injector a...
1997 GMC Jimmy SLT 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKDT13W1V
bob and jon hit the nail on the head, checked running compression only had 60 psi. Never even thought about doing a running compression check, this will not burn me again. I tore the head off and sure enough #4 exhaust valve was sticking due to the fact it was... Trouble codes: P0304.
2003 Oldsmobile Alero GL 3.4L class 2 bus line VIN: IG3NL12E83
First of all thanks agin for the help. I did find the splice pack and removed the comb i found the short to voltage in the abs module harness took harness apart and there it was. About 3 inches behind the plug to module. Thanks agin for the help biggest pro...
1999 Pontiac Grand Prix SE 3.8L cruise control VIN: 1G2WP12K2X
Unable to resolve concern at this time. Tried a second cruise control module and checked all wiring for grounds, opens, and shorts. Verified brake switches and cruise switches operated properly. Not being a GM dealer or independant shop, do not have access to...
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