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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 10, 2010
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Open Help Requests for GM
Help Request Answers
1986 Buick Regal Grand National 3.8L Poor Idle Quality VIN: 1G4GK4774G
Hi iATN, looking for some help with odds and ends. I have to finish an engine job that I did not start so as you can imagine I'm not having too much fun. A few questions for this '86 Grand National 3.8L VIN 7. 1) Camshaft sensor setup? I have the engine runn...
1998 Buick LeSabre Limited 3.8L 1st gear VIN: 1G4HP52K6W
This Buick has the "harsh chatter on hard accel" from a stop. We had the pcm reprogramed with the latest up date. After getting it back together and a test drive, we find it still has this harsh chatter on accel from a stop. It's not as bad as before the up da...
2005 Buick LeSabre Custom 3.8L a/c compressor VIN: 1G4HP52K25
This one is getting me. Original complaint was poor cooling, and slight noise under hood. Upon inspection found compressor to be noisy, a/c pressures were not the greatest. Low side would only get to about 60psi and high side stayed right around 200psi. System...
1991 Chevrolet Camaro Z28 5.7L Hesitation, Cuts out, Misfire VIN: 1G1FP2381M
The customer bought this car 2 months ago from the second owner. The previous owner had bought the car with 10K and sold it with 90k. My customer states that it began to lose power a few weeks after purchase. So he came into the shop complaining of Loss of Pow...
1995 Chevrolet Blazer 4.3L Oil Pressure VIN: 1GNPT13W9S
customer brought in for check gauges light on at idel,oil pressure gauge at zero ideling.installed manual gauge to verify pressure reading,correct. engine has no lifter noise or other.pulled pan and found bearings very worn,pulled engine and had crank recondit...
1996 Chevrolet C1500 Suburban 5.7L transfer cas VIN: 1GNEK13R4T
hi everybody. i have this truck in my shop, customer said that 4x4 system doesn`t work properly, then when key is off, encoder motor stays working by self. found wiring harness connected wrong in the transmission area, corrected that problem, now 4x4 seems wor...
1997 Chevrolet Express 2500 5.0L Hesitation, Cuts out, Stall VIN: 1GCFG29M8V
i have this van that originally came in for a running at idle but stalls when accelerate. i first thought of fuel pump but pressures and volume are good and customer stated new fuel pump replaced wiyhin last 6 months. scan tool revealed inaccurate mass air flo...
1999 Chevrolet Corvette 5.7L long crank time VIN: 1G1YY32G2X
this car cam in with a running rough problem,and a complaint of a long crank time.checked the fuel presser and noticed it would read 55 pounds but would drop down tow 0 pounds real fast,so i jumped on it and replaced the fuel pump.did not fix the problem.this ... Trouble codes: P0157, P0300, P0410, P1637
1999 Chevrolet Express 2500 5.7L No Crank VIN: 1GAGG25RX1
BLOWES 40 AMP IGNITION FUSE INTERMITNLY CAN GO For DAYS WITH OUT BLOWING FUSE. Van is never runing when fuse blowes when customer starts van it blowes. already tried ignition switch still blowes fuse. Tried stater also still came back with fuse burnt.I hope so...
2000 Chevrolet Tracker 2.0L Poor Idle Quality VIN: 2CNBE18C84
Little truck runs good other than at idle under load buzzes real bad.Idle is rough
2000 Chevrolet Suburban 1500 LT 5.3L stopping distance, pedal VIN: 3GNFK16T8Y
So this one has me going crazy. When you drive this truck normally, all is well. Pedal feels great. Brake performance is very good. No issues. Its when you try and do any sort of heavy or panic stops, thats when it gets scary. It is very hard to explain, but...
2003 Chevrolet Corvette 5.7L Cuts out, Stall VIN: 1G1YY12S73
I have a 2003 Chevrolet Corvette that shuts the engine down as soon at it starts rolling and showing vehicle speed. Starts right back up and runs fine. If the clutch is slowly let out, you can creep along below 2 mph without a problem. Problem happens even coa... Trouble codes: C1214, C1221, C1222, C1248, C1277, C1287
2008 Chevrolet Express 3500 6.0L overdrive VIN: 1GBKG31K28
When driving at approx 50-60 km/hr with transmission in overdrive position will hear a high pitch whine noise on decell. Noise will go away when trans is manually shifted into 3rd. Did notice that whine seems to be more pronounced with tow/haul switch in the o...
2001 GMC Sonoma SL 2.2L No Start VIN: 1GTCS14531
hi guys,vehicle towed to shop,died while driving.upon inspection we found engine to be siezed.replaced with a known good one and vehicle cranks but will not start.we have 38 psi fuel pressure,and when cranking engine we have ignition spark at plugs for only 1s...
1999 Oldsmobile Aurora 4.0L Steering VIN: 1G3GR62C3X
Customer brought in car said it was not turning left. I test drove and confirmed this to be correct. Turns right normal but not left. Installed power steering pressure test gauge directly on pump and found that while turning right pressure is 800 to 1100 psi w...
2000 Pontiac Grand Am SE1 2.4L Engine VIN: 1G2NF52T6Y
The vibration occurs at idle speed in park or in gear. Vibration does go away off of idle speed- you can see the engine shaking while it is running.
2003 Pontiac Grand Prix GT 3.8L Transmission VIN: 1G2WP52KO3
Hi all, this Grand Prix came in yesterday with complaint of erratic shifting and jerking. I went for a drive and it was doing all that, and the speedo was bouncing up and down as well. All of a sudden the speedo went down to zero and the trans stayed in first ...
2004 Saturn Vue 2.2L Clutch pedal VIN: 5GZCZ23D04
HAve this vue here doing some weird things with clutch. First came in with complaint of not being able to shift into gear. Would let sit afew check the fluid lvl (it was low once customer refilled the first time)pump the pedal a few times and it would be fine....

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac Seville SLS 4.6L Air Output VIN: 1G6K52Y5TU
After talking to client and having him run a/c on recirc(which he was not doing in hot weather), he seems to be happy eith the performance. It has not quit on him since the first posting. Thanks to all who sent in suggestions.
1996 Chevrolet C1500 5.7L cylinder VIN: 2GCEC19R1T
After removing the intake, I inspected the #1 port with a light and small mirror and could find nothing. I removed the plastic plunum and looked hard for anywhere coolant can enter #1, but nothing again. The intake gasket was crumbling, like always, and afte...
1999 Chevrolet Corvette 5.7L Stall VIN: 1G1YY32G3X
hi all, finally got ok to remove the alarm, what a nightmare. repaired wires to ign. switch,did a theft relearn again and it fired up w/ no column lock displayed,test drive was ok also. thanks to all who replied. thanks again John
2005 Chevrolet Equinox LT 3.4L No Start, Cuts out, Stall VIN: 2CNDL73F75
Thank you everybody, You saved me a ton of time,The pcm was the problem,We installed and had to send to dealer to have flashed. Car is fixed, customer is happy. Thanks Again Joe P Trouble codes: P0601, P0606, U1000 (Lost class 2 data link), U1016 (u1024-), U1024 (u1064-), U1064.
2005 Chevrolet Cavalier 2.2L Clutch VIN: 1HC5498787
Today we pulled the tranny and changed the slave cylinder and clutch. All is well know. There was a little bit of fluid on the slave, but bellhousing was dry. Must have been drawing in air. Thank you
1997 GMC Savana 3500 6.5L No Start VIN: 1GDJG31F7V
John, Scott and Doug all suggested inspecting the fuel pump connector (gray wire) near transmission. I'm sure this isn't the issue because I can run the pump with the scan tool and monitor the pressure and the vehicle still won't start. The customer took the v...
2001 GMC Yukon XL 1500 SLT 5.3L Compressor clutch VIN: 1GKFK16T91
After looking through the wiring diagram multiple times something jumped out at me. This vehicle did not have a high pressure switch @ compressor, just high pressure recirculation switch in high side line between compressor & condensor. I took a look at the wi...
1997 Oldsmobile Bravada 4.3L transfercase VIN: 1GHDT13W5V
Some of you said to check the U-joints as my post stated they were new. Many said to check the mounts (engine and transmission) they were ok. I am sure the problem is in the transfer case. I priced out parts and also a salvage yard case. But the truck has othe...
2000 Oldsmobile Silhouette GL 3.4L 2-3 Shift Solenoid VIN: 1GHDX03E2Y
Thanks to all who commented on this one. The problem was in the 20 way connector the goes into the transmission. The connections were not lining up with the ends on the transmission.
2004 Pontiac Sunfire SE 2.2L Misfire, MIL Lamp on VIN: 1G2JB12F14
thanks for all the advice. the pcm did the trick. i think just about all of you hit the nail on the head with this one. i don't have a good answer as to why the fuel pump relay was doing the funky chicken when i twisted the harness with the pcm disconnected bu... Trouble codes: P0300 (misfire detected), P0203 (Injector 3 control circuit).
2007 Pontiac G6 3.5L fuel gauge VIN: 1G2ZH58N07
the purple wire in the harness was broken on the topside when we dropped the tank and removed the loom found it had rubbed through thanks all
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