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Prev Professional Automotive Repair Technical Discussions for July 26, 2012
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Open Help Requests for GM
Help Request Answers
1994 Buick Commercial Chassis 5.7L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire VIN: 1G4BR82P0R
Need advice. I bought this vehicle from a customer last summer because he brought it in for an occasional no start condition.It is a 1994 Buick Roadmaster Estate wagon 5.7L. I could never duplicate the condition except once and at that time there was no spark ...
1996 Buick Park Avenue Ultra 3.8L No Air Flow Out Of Vents VIN: 1G4CU521XT
customer came in for no air flow anywhere but defrost found broken vaccum line from the vaccum source repaired now i can get floor and defrost just no vents if i put vaccum straight to the blue vaccum line for vents it works like it should so i replaced progra...
2003 Buick Park Avenue 3.8L air blend doors VIN: 1G4CW54K03
having trouble with the blend doors not responding. hooked up scan tool and can actuate doors with scanner on both sides from hot to cold but doors will not respond by way of the control head. car has dual ac climate control the doors do not work on both sides...
1986 Cadillac DeVille Touring 4.1L engine VIN: 1G6CD6986G
vehicle came in with a rough idle. found worn cap/rotor,weak fuel pump.replaced those plusfilter and cleared lines. no change in performance. what is the injector voltage on these engines? any suggestions very much appreciated! Thanx, Jess
1972 Chevrolet Corvette 7.4L Unknown VIN: 1Z67W2S508
Hey guys, we are considering replacing the POA Valve with an updated unit that converts it to "Cycling Clutch" type system so we can use R134a. Have less and less people around here that can service R12 systems. Is there any thing else in the system that needs...
1991 Chevrolet Camaro Z28 5.7L starter
Hello guys, Camaro towed for no start condition - starter motor noisy. Other shop replaced 5.7L engine for 6.2L.After that cranking was slow and finaly got noisy.Removed starter and found all the teeth on drive broken.What I dont know is if the teeth were sim...
1999 Chevrolet Silverado 2500 6.0L ABS Module VIN: 1GCGK29U1X
the diagnostic tests schematic i did shows if voltage drops are ok to replace the ebcm. just wondering is 0.32 volts to much voltage drop.
2003 Chevrolet Express 3500 6.0L fuse# 23 VIN: 1GBHG31U83
Thanks in advance for any help. This is one of our fleet accounts, very clean cargo van with low miles. Came in on tow, died driving and no crank after. We found fuse #23 blown. Replaced fuse van started and ran for 2 days no probleme. Cust. picked up and afte...
2003 Chevrolet Silverado 1500 5.3L High idle VIN: 1GCEK19T13
Was at gm dealer...start truck up and idles to 3500 rpm...then shoots up to 6500 was flashed at the dealer
2005 Chevrolet Silverado 2500 HD 6.0L Timing chain VIN: 1GCHK29U75
Customer was turning off highway to secondary road, heard a "grinding noise" and engine quit. Would not restart. Our apprentice checked compression, found zero psi back four cylinders. Removing timing cover revealed broken timing chain. First question: If the ...
2010 Chevrolet Equinox LS 2.4L MIL Light VIN: 2CNALBEW0A
Hello IATN Members I Have a 2010 Chevrolet Equinox 2.4 With No Driveabilty Complaints But A Persistant P0010 Intake Camshaft Solenoid Circuit Code.I Suspect A Intake Solenoid Control Valve But Wanted to Know If Anyone Has Seen This.Engine Doesn't Appear To Be ...
1993 GMC K1500 Suburban SLE 5.7L speedo/ transmision VIN: 1GKFK16K2P
We tracked down whats called the speed buffer module and when that is unplugged we have perfect ac signal when it is installed we completely lose the signal. of course no one has one of these as they have been discontinued and I went to the junkyard and got th...
1997 GMC K2500 Sierra SL 6.5L boost VIN: 1GTGK29F7V
Ok p0236 is the code. While i was relocating the (black, new in 2010) pmd i notaced there was no resistor chip inside there the harness plugs in, should there be one ? Also the truck shows 14 lbs of boost at idle and goes up to 18 at full throttle. I might be ...
1995 Oldsmobile 98 Regency Elite 3.8L stalls VIN: 1G3CX52K9S
vehicle was towed in about six weeks ago with cylinders full of coolant due to upper intake blown/burned at egr passage.installed new lower gaskets and upper intake runs great,except it will intermittently die/ restarts and will run fine f...
1995 Pontiac Grand Am GT 3.1L Multiple DTC's VIN: 1G2NW15M0S
Hello im having issues with this sweet pontiac, I had recently done headgaskets, with new plugs and wires. Been driving for about 300 miles now. Just the other day I went to take off and it felt like the trany was in 3rd gear, so I pulled it down to man 2 and ... Trouble codes: 86 (54 -), 54 (99 -), 99 (21 -), 21 (45 -), 45 (44 -), 44

Fixes & Summaries for GM
Fix/Summary Answers
1999 Chevrolet K3500 6.5L Excessive Emissions, Surge VIN: 1GBJK34F4X
Ok, I can call this one fixed, sorry for the help request taking so long to close. Customer decided to take vehicle and drive it until conditions became more constant, because previously the vehicle would just act up randomly on the road. Truck came back in wi... Trouble codes: P0219, P0226 (Accelerator pedal position sensor 3).
2007 Chevrolet HHR LT 2.4L Mechanical VIN: 3GNDA33PX7
Hi, I have not been able to get this customer to return with the car yet. However, the replies I received are as follows: 1. Apply power & ground to the solenoids and watch for movement, then switch and see if it moves back 2. Check with an ohm meter (But n...
2004 GMC Sierra 2500 SLE 6.0L doors VIN: 1GTHK24U94
I got the door open and a new lock installed and all works well but still confused,a electric lock unit and no electric lock buttons for 183.00 dollars,why is that. Thanks to every one for taking the time to answer my post. I like the idea or a small light in...
2004 GMC Sierra 2500 HD 6.0L fuel gauge VIN: 1GTHK23U74
Thanks for the replies. It's not fixed but i'm pretty sure i know what's wrong. The owner failed to mention that a transfer fuel tank in the bed of the truck was installed recently. What i discovered is someone also jumped the 2 wires going to the sending uni...
1995 Pontiac Grand Am SE 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Poor Fuel Economy, MIL Lamp on VIN: 1G2NE55M3S
The vehicle is finally fixed. Was not able to work on it for a while due to higher priority work. GM hotline suggested replacing the ignition switch. Said it was a common failure for this type of problem. I had already checked all related circuits but replaced... Trouble codes: 13, 21 (Oxygen sensor tps), 36, 41 (24x signal est line), 44, 45 (Lean rich), 74, 75 (A/c pressure egr), 85 (Prom error), 98 (Invalid pcm program).
2000 Pontiac Grand Am SE 2.4L cranking VIN: 1G2NF52T5Y
Should always check the basic stuff first.When the owner called to see how her car was doing she asked if I would check the A/C because it started making noise after her boyfriend tried to recharge it,needless to say he locked up the compressor so I pulled the...
2000 Pontiac Grand Am GT 3.4L Cooling Fans VIN: 1G2NW12E1Y
Well the first used ECU I got was bad. Engine started, fans seemed to work properly but the gauges in the dash didn't work! Second ECU I got, the gauges all worked but the engine would not start. Turns out I just had to reset the security system. Turned th...
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