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Prev Professional Automotive Repair Technical Discussions for January 23, 2009
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1997 Buick Park Avenue 3.8L abs mod VIN: 1G4CW52K8V
thanks for all your help,I have abs and track off light on all the time with no codes in any systems,the track on/off switch is fuctioning correcty at the on my modis says abs fault and tcs fault,abs is not dissabled but tcs is i,m thinking i have a...
1990 Cadillac DeVille 4.5L Surge VIN: 1G6CD5336L
Hello and Help, I have been working on this car for way too long and need help. Customer's original complaint was that the check engine light was on and a mis-fire. We immediately found that the check engine light was on for a code 41 (we found that the cam s... Trouble codes: F10
1995 Cadillac DeVille 4.9L No Start VIN: 1G6KD52B7S
Hey folks, got this one w/no spark. Cust parked car, went to start next day no go. Tow in, we replace module in dist. Ck'd all fuses, found this has a used computer in it. Any help w/tests on this one. Also had code [...] ecm fault. Thanks for the time..... Trouble codes: 83 (no crank a or b), 81 (cam to ref fault), 78 (to many 24x pulse), 104 (internal ecm prob/stack overrun), 113 (quad driver 1 open/short), 112 (eeprom failure)
1997 Cadillac Eldorado 4.6L head gaskets VIN: 1G6EL12Y7V
I need a little insight on a 97 caddy eldorado 4.6 I'm getting exhuast gas in the coolant. An the customer stated that it did get hot. My question is when changing head gaskets do you put all the inserts in for your head bolts right away or do you try torque t...
2001 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y31
hello techs, lets see if you can help me with a cadillac that arrived today. Customers complaint is, the car was hard starting, and when it did start it would not idle and he had to keep it running by pushing the accelerar pedal down by foot, when letting go i... Trouble codes: P0101, P0420
2003 Cadillac Escalade 6.0L Ignition VIN: 1GYEK63N73
Customer concern dies on the road. Test drove for several miles on the highway. got stuck in traffic and at low rpm crawl SUV died. like a slow turn off. cranked, start stall several times. then kicked. ran fine for 30 min. At speed (75mph) crusin just shut of...
2005 Cadillac Escalade 6.0L Ride Control VIN: 1GYEK63N85
While driving the vehicle at 45 to 50 mph there is a front end shudder. If you let off or get into the gas it go'es away. Changed the idle and pitman arm due to slight play. Ballanced and rotated the tires twice. All the suspention components are tight. Very s...
1987 Chevrolet R10 Suburban Custom Deluxe 5.7L No Start VIN: 1GNER16K4H
Hi, all. I feel kinda silly. This should be a no brainer, but I keep running in circles. This Suburban has to be cranked for about 5 seconds before it gets fuel pressure and starts. It has the oil pressure-fuel pressure switch, so oil pressure has to build up ...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13W3S
Hello gentlemen, this Blazer runs rich all the time. Fuel pressure is 54psi and rises to 60psi when you snap throttle. Oxygen sensors are at 800-950mv constantley and the computer is trying to hold back fuel - injector time is 0.1ms. Air filter is clean, there... Trouble codes: P0300 (Random Missfire detected)
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNDT13W4S
I have a 1995 chevrolet blazer that has a very poor idle and blows black smoke out of the tail pipe.the idle almost seems and smells like that of a blazer with a plugged egr valve (without the surging) the egr valve has been replaced by the customer.i removed ...
1996 Chevrolet Caprice Classic 5.7L Heat VIN: 1G1BL52P0T
customer stated he would loose heat when driving..and noticed temp gauge slightly higher then normal but not overheating. we flushed cooling system and heater core with no problems found refilled system heat works great at idle. Took out on test drive when mov...
2001 Chevrolet Impala LS 3.8L Charge Lamp,ABS Light,Brake Light,Air Bag Light VIN: 2G1WH55KY1
Vehicle came in with intermittant lights on dash flashing.All four lights flash every second for (4) flashes then off for (3) seconds.While lights are flashing the alternator is putting out appox 14 volts.No codes in any computer.I have replaced the battery & ...
2002 Chevrolet S10 4.3L master/ booster VIN: 1GCEE19W62
Customer came in with loss of pedal we look over to see if their was any leaks found nothing we changed master bleed sytem a couple times to make sure of no air pedal still goes down after about 5sec if we pick the idle to about 2,000 rpm the pedal still goes ...
2002 Chevrolet Monte Carlo LS 3.4L low beams VIN: 2G1WW12E92
headlamps inop. checked light bulbs, checks good. checked headlamp switch, checks good. found relay inop. installed new no help. power to headlamps, power to switch, power to relay, (both sides), headlamp switch controls relay. able to control relay with scann...
2002 Chevrolet Astro LS 4.3L Excessive ststic in radio VIN: 1GNDM19X72
Has anyone had a problem with excessive noise in a short wave radio(Ham) with engine running. All antenna connections and grounds have been made real solid. Gets louder with higher rpm going down the road. All grounding did not effect a change one bit. Ignitio...
2002 Chevrolet S10 4.3L heater VIN: 1GCCT19WX2
This customer brought vehicle to our shop after working on it at home. He has changed out the coolant twice in 60K. At the end of last winter, he noticed dimished Hot air coming thru the vents. Plenty of air flow on ac or heater. He installed a bypass flusher ...
2003 Chevrolet Trailblazer North Face 4.2L Poor Idle Quality VIN: 1GNDT13SX3
Truck came in for a miss fire problem and to replace the plugs.Found that coil 1 was burnt out.Once done truck was runing fine so took it for a test drive.It was cold out side so turned on the heater fan and the engine started to idle bad.Brought it back to th...
2003 Chevrolet Silverado 1500 5.3L Excessive Emissions, MIL Lamp on VIN: 2GCEK19T73
The truck originally came in for a rough run and CEL. Retrieved code for B1S1 o2. Moniter O2 and found that it was stuck lean. There for it was dumping fuel into bank 1 causing the rough run. Replaced B1S1 O2 and problem was solved. I noted to the customer tha... Trouble codes: P0138 (B1S2 Voltage High)
2004 Chevrolet Silverado 2500 HD 6.6L Fuel Gauge VIN: 1GLHK23184
The customer came back again today. And it seems the gas gauge reads backward. It came in and he said the truck was full and the gas gauge was on 1/4. My first thought was the customer had filled the tank up while the truck was running. So I took the truck and...
2004 Chevrolet Silverado 2500 HD 6.6L Hesitation, MIL Lamp on VIN: 1GCHK292X4
Performed diagnostics per alldata pointing towards fuel rail pressure sensor. not that familuer with these motors, my dealer has never seen a problem with the pressure sensor just wondering if any body has seen this before or has any further diagnostics i coul... Trouble codes: P1093
2004 Chevrolet Silverado 1500 4.8L speed cluster VIN: 2GCEC19T84
Speed indicator is not working,tries to work at times,it has registered no higher than 45MPH no matter of veh speed when it does work
2004 Chevrolet Blazer LS 4.3L Excessive Emissions, MIL Lamp on VIN: X24K113591
Hello gang, I need help with this one.This is the first time asking for help.I need somebody to educate me on this one.I replace both upstream and same codes are returning.Heater resistance measure 9.6 ohms and had pwr and grd on both htr hi and low on both b... Trouble codes: P0135, P1153
2005 Chevrolet Trailblazer EXT LS 4.2L Stall VIN: 1GNDS13S45
Hey you GM guru's. This came from a local bodyshop. Vehicle was hit in the rearend and battery was either disconnected or run down while at the bodyshop. Now that the repairs are done it runs okay but stalls upon decel coming to a stop. Just drive down the roa...
1997 GMC K2500 Sierra SL 5.7L Poor Idle Quality, Misfire VIN: 1GTGK24R1V
this truck runs great after it warms up in the shop.outside once it cools off runs stumbles but has no codes for misfire.coolant temp sensor is accurate,charge temp is accurate.coil resistance is ok.fuel pressure is 70 psi.exhaust is good.grounds are g...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue 3.8L Accessories VIN: 1GM1543SD3
this vehicle is all fixed now the problem turned out to be had a hole rotten in r/r strut mount and water went in and damanged the main connector in the trunk which feeds the RFA module...thank you again for everyones help...
1995 Chevrolet K2500 Suburban 6.5L Cuts out, Stall VIN: 1GNGK26F0S
Thanks for the help. we remote mounted the PMD (pump mounted driver) and found it had been replaced but was not properly mounted that add to the heat problem. the customer elected to try the old PMD now it's located in a cooler location.
2001 Chevrolet Suburban 1500 5.3L transfer case VIN: 1GNFK16TX1
Hello all; Thanks for all your help on this one. I am not a transmission or transfer case specialist. Many replied with reference to the clutch pack in the transfer case. I was told to check the fluid, but didn't have the vehicle in my possession any more....
2002 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1SF23368
harness damage at drivers side shock tower chewed thru 3 wires thanx for everyones help Trouble codes: P0201.
2004 Chevrolet Trailblazer LS 4.2L Surge, Cuts out, MIL Lamp on VIN: 1GNDS13S24
After Checking Multiply Things I Found The Conveter Was Clogged Up . Replaced The Converter And Cleared All Codes And Let Customer Have Vehicle And Asked Them To Stop Back By To Check OBD II Monitors . Customer Returns And Says It Never Drove Better And All ... Trouble codes: P0128, P1171.
2004 Chevrolet Malibu 2.2L Poor Idle Quality, Cuts out VIN: 1G1SF23368
we found it rodent damage to harness for comp at drivers side shock tower only chewed thru 3 wires thanx to everyone for their help Trouble codes: 1682 (ignition circut), 2101 (tps circut).
2000 GMC Yukon XL 1500 SLE 5.3L engine VIN: 3GKFK16TXY
Thanks to all replies lots of good info. From what I have been able to find out about these heads there is a prob. with the casting. Installing 2 reman heads for the cracking condition thanks for all the help the first set of heads I recived were castec hea...
2002 Saturn SL1 1.9L Poor Idle Quality, high idle VIN: IG8ZH5287Z
every body said tps they said to check data at idle see if it fluctuates they also said its hard to find it glitch I will get it back in put one on and post the final conclusion.thank you
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