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Prev Professional Automotive Repair Technical Discussions for April 9, 2008
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Open Help Requests for GM
Help Request Answers
1994 Cadillac Fleetwood 5.7L Surge VIN: 1G6DW52P4R
Hi this is my first time requesting help, this one really has me baffled. This Cad fleetwood was brought into our shop from the local Cad shop. This vehicle has a very pronounced surge (like a missfire) at approx. 45-55 mph at light throttle approx. 12%-18% tp...
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1985 Chevrolet Corvette 5.7L Starting VIN: 1G1YY0782F
Here we have a 1985 vette that wont stay running. My scanner will not communicate with it either. Car goes as follows. Crank over wil run then sputter and die. Have spark and fuel pressure. If you hold it craking it will continue to run, but when key is releas...
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1985 Chevrolet El Camino 5.0L Hesitation VIN: 3GCCW80HFS
I am seeking advice from hot rodders. It's been a long time since I tinkered with one of these! I recently installed this engine in my brother's car. It runs great and will smoke the tires off of it once I get past the stumble and hesitation in it. I set the i...
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1993 Chevrolet C1500 Cheyenne 4.3L no speedometer VIN: 1GCDC14Z7P
would like to know what could be causing no speedometer and no up shift, had dash checked--good. brake light on in cluster, fuse for abs is good
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1994 Chevrolet S10 LS 4.3L Surge VIN: 1GCDT19W8R
Hey Guy's This one has me scratching my head.I start it cold and go for a road test and it runs good other than the slightly rough idle I notice in most 4.3L's. Then when you finish the road test when I shut the truck down and restart right away I have an idl...
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1995 Chevrolet G30 Chevy Van 5.7L Hydro Boost VIN: 1GCHG35K5S
Hi everyone. Im in need of help with this one, since i am not very familiar with these hydro boost systems. Whats going on is, the steering becomes realy stiff during braking. If i accelerate during braking, then it becomes a little better, but i can hear the ...
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1995 Chevrolet Beretta 2.2L Surge VIN: 1G1LV1549S
Under light throttle has a little surge, found egr opening at .84v on tp, unplug egr and surge goes away. I didn't think it should open at .84v under load in my shop. scaner shows open command everytime, am i just reading my info wrong, or is the egr valve get...
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1997 Chevrolet Blazer 4.3L Misfire VIN: 1GKCS13W2V
has misfire,worse @idle.ran good prior to repairs,double checked all work by 2 senior techs,any chance air can enter fuel system and cause multiple misfire,we are stumped because vehicle ran good prior to repairs.thanks in advance for any advice. Trouble codes: P0300
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1998 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G2JB1244W
Hi Guys, I really need some help with this one. Car came in idling at 1200 RPM with code p0507 - IAC speed high. Iplugged the Iac passage in the throttle body and the idle speed dropped to near normal. The IAC counts were at 0 at this time. Replaced Iac valve ... Trouble codes: P0507 (IAC Speed high)
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1999 Chevrolet Tahoe LS 5.7L radio light VIN: 1GNEK13R0X
I have a few GM vehicles in for repair, as have we all, that have radio bulbs burned out. I have received some good sources to get bulbs but they come in various voltages. Does anyone know for a fact what voltage the bulbs receive? I would assume 12v but consi...
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2000 Chevrolet Venture 3.4L sliding door VIN: 1GNDX03E1Y
opens automaticly when driving vehicle
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2000 Chevrolet C3500 5.7L Hesitation, Stall VIN: 1GBGC33R3Y
This truck came in with intake gasket leaking water. replace intake gasket. This problem of hesitation was in the truck before intake gasket replacement. When you snap the throttle from idle the engine will stall and spit back through the intake always hot or ...
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2002 Chevrolet Impala 3.4L Starter signal VIN: 2G1WF55E82
Car came from another shop for us to program new PCM. Reason they changed it was because it was not sending a ground signal from PCM to ingage starter relay. After programing new PCM it still had same problem. The only code given after relacing PCM is code for...
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2003 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1ND52JX3
This car drove up customer got out left it runnning.I told him shut it off the car was idling at 4000 RPM.The customer cycled the key a few times the car idles at spec now usally when i have a TPS problem the idle is to low help me guys this is a new customer ... Trouble codes: P1122 (TP sensor circuit intermittent low voltage), P1554 (Cruise control feedback circuit)
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2003 Chevrolet Tahoe LT 5.3L Hesitation, Stall VIN: 1GNEK13Z83
Got a problem while driving down the road or coming to a stop the vehicle will stumble but not die and the doors will unlock, it will pick back up and the doors will relock and continue to go down the road. Has a code po706 for trans range sensor, and has had ... Trouble codes: P0706
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2005 Chevrolet Venture LS 3.4L Hesitation, Cuts out, Stall VIN: 1GNDV23EX5
Hello to all, again; Today's nightmare would be a motor change on a 2005 Chevy Venture. Snap throttle at idle, or under load, pulling a way from a stop light and lightly feathering the pedal produces a nice hesitation before everything kicks in and maybe once ...
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1997 GMC K2500 Sierra SL 6.5L push rod VIN: 1GTGK24F3V
Had a noise on start up and when warmed up engine was missing.With scanner found #2 cylinder was the one not helping.also had a popping noise in intake. pulled valve cover and found exhaust push rod bent but not out of place.Valve seems to open fine now. My qu...
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1999 GMC Safari SL 4.3L No Start, Poor Idle Quality VIN: 1GTDM19W2X
Have this 99 GMC Safari here. Found no communication; dx bad vcm. Unplugged VCM and roughly 1 qt of fuel came out. Connectors and harness obviously fuel soaked. Through cranking car, can not find obvious signs of fuel being pumped into the computer. What has ...
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1999 GMC Sierra 1500 SL 5.3L low brake padel VIN: 13TEG1452U
hi guys thanks for any replys that are send. in the shop we seen to do alot of complete brake line changes due to rust (ns)latley.. we are having problems getting a full brake pedal like there are still air in the system.. are we over looking something.. we di...
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2004 GMC Sierra 2500 HD SLE 6.6L Hesitation VIN: 1GTHK24284
Diesel Gurus, Please help! This customer says that when pulling his cattle trailer this truck will belch black smoke from exhaust, will lay down on power, and the transmission shifts funny. Then, like someone flipped a switch, power comes back and smoke goes a... Trouble codes: P0045 (Turbocharger Vane Position Control Solenoid Circuit), P1093 (Fuel Rail Pressure Sensor Circuit High Voltage)
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1964 Oldsmobile Cutlass 330CID overheating VIN: 824M319106
Engine temperature at idle 210F/ with out auxilary fan running. 190 degree with fan running. Temperature at cruise speed 180 without fan running. Timing set at 7.5BTDC
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1999 Oldsmobile Aurora 4.0L Poor Idle Quality, Hesitation, Misfire VIN: 163GR62C0X
This vechicle came in for MIL and poor idle (miss at idle) I pulled codes, found the laundry list, and constant misfires on #5. Since this vehicle is a regular in my shop, I peformed a inj. flow test and resistance test since I just istalled plugs and wires ab... Trouble codes: P0300, P0440, P0560, P0603, P1637
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2002 Pontiac Grand Prix GTP 3.8L starter VIN: 1G2WR12162
Vehicle towed in as a no start. Put vehicle up with helper turning key, No power on Purple selenoid wire on starter, voltage on Bat+ wire. Crossed selenoid, engine cranked. Talked to local dealer Tech, Said Ignition Switch bad. Sounded good. Replaced ignition ...
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Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Seville STS 4.6L MIL Lamp on, ABS lamps VIN: 1G6KY5496W
Sorry for the long delay, dash was out for repair and we took our time on this one too. After the dash repair and cleaning all the grounds we could find we got the car down to one issue, the ABS comes on about once a day and set a comm. code with the EBTCM. I ... Trouble codes: 1602 (loss of ABS serial data), 1641 (MIL cont. ckt.), 1560 (CC not in drve), 1644 (TP or torqued delivered), 1611 (loss of CVRTD data), 1604 (loss of IP data).
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2003 Cadillac Escalade 6.0L suspension VIN: 1GTEK63N3R
GUYS THIS ONES FIXED WHAT I FOUND WAS THAT THE SWAY BAR LINKS WERE NOT TOTALLY TIGHTEND FROM THE FACTORY AND NEITHER WERE THE FRONT SHOCKS UPPER SUPPORT AND THE CUSTOMER SAID IT JUST GOT WORSE OVER TIME AFTER TIGHTENING THESE ITEMS AND A ROADTEST IT RIDES LIKE...
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1998 Chevrolet Malibu LS 3.1L Front suspension VIN: 1G1NE52M3W
Thanks to all the responses in a very short time, after checking and rechecking everything we ended up trying outer tie rod ends and it is completely quiet. Even after the old tie rod ends were removed you could not tell that they were loose. We still cant bel...
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1999 Chevrolet K2500 5.7L crank no spark VIN: 1GC43RRKDE
double checked wiring and found broken wire under fuse box for vcm or ignition what made me look under there was i had no check engine light on with the [...] on or cranking so i started to do a wiggle test and found that the light would come back on again found...
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2000 Chevrolet Silverado 2500 6.0L 6.0 to 5.3 swap VIN: 1GCFC24U8Y
The cusomer backed out. He had just purchased the truck, and had the opportunity to get his money back. Most of the replies from people who had actually done the swap said it would be ok. Some had done it with no complications.
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2001 Chevrolet Express 2500 5.7L Misfire VIN: 1GCFG25R11
HI GUYS, IT IS FIXED!A NIGHTMARE,WE BROUGHT THE VAN TO THE DEALER TO FLASH THE ECM,AND TO CHECK FOR MISFIRE,SO THEY DID,BUT COULD NOT FIGURE OUT THE MISFIRE DATA,WE GOT IT BACK SPENT A OTHER 1,5 DAY ON IT.FINALLY CALLED IN A MECHANIC ,HE GO'S FROM SHOP TO SHOP... Trouble codes: P1381 (mis fire- no comunication with brake controle module), P0300.
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2002 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Stall, Misfire VIN: 2GCEC19W82
Thanks to all that responded. I waited to close this to make sure it was fixed. I cleaned injectors & replaced #2 it was stuck open. Cats were plugged again due to injectors & pressure regulator. Runs great & dist was at 0. Thanks again Trouble codes: 300 (Random Missfire).
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2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23153
Sorry for the late posting, I was waiting until it was fixed. I sent it to the dealership. Cust. just picked it up and told me they replaced the injectors and covered it under warranty. They didn't give me anymore details on what happened. Thanks for all the r...
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2004 Chevrolet Cavalier 2.2L Speedometer, Fuel level VIN: 1G1JC52F64
I checked class 2 serial data lines #1708 to every module with no resistance so I ordered another IPC. Replacement cluster fixed it. Thanks to everyone who gave me input.
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2006 Chevrolet Express 1500 5.3L Hesitation, Cuts out, Misfire VIN: 1GNFH15T36
Well I wish I could say this was fixed. I logged over 200 miles on the van and it never giggled. All readings were perfect, Allan recommended checking the vent sol. and it was ok. Fuel trims good,presure good, scan data good.Mac tools has a recorder device for...
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2006 Hummer H2 6.0L fuel filter
Hello all, I received 15 replies to this help request. Most people were very helpful, with Brian of Michigan giving a lot of useful information. Matthew of Ohio gave a smart alec remark, and several people commented that parts stores list external fuel filters...
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2000 Oldsmobile Alero GL 2.4L automatic door locks VIN: 1G3NL52T2Y
So simple to fix when you have the information. I've been pulling out hair over a disappointed good customer. Got 5 replies that gave me the info I needed plus more to program the automatic locks and send her on her way with a smile on her face. Close the d...
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