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Prev Professional Automotive Repair Technical Discussions for May 21, 2005
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Open Help Requests for All Makes and Models
Help Request Answers
1997 Cadillac DeVille 4.6L Hesitation, MIL Lamp on VIN: 1G6KD54Y3V
Engine runs good most of the times but hesitates on acceleration once in a while and immediately sets code P0101. Freeze frame data: Fuel system closed loop... Load 26.2% ...Coolant temp 212 deg... Short term fuel trim 1 -16.5%... Long term fuel trim 1 -17.... Trouble codes: P0101 (Mass airflow problem)
1996 Chevrolet Camaro 3.8L Surge, Cuts out, Slight buck (hitch) VIN: 2G1FP22K4T
Hello fellows. Does anyone know what trailer hitching is? That is my best description of symptoms on this car. It seems to do this worse under 40 MPH, but does not matter what speed the car is in. Engine does not have to be under load. In fact it reacts worse ...
1998 Chevrolet K3500 Cheyenne 6.5L 4x4 electricel VIN: 1GCHK33F4W
please help guys this one kicking my but .this came in for no upshift in low range . scanned with modis and found 4x4 not engaging so figured pcm just doesnt realise that its even in low range. found that transfer relay wasnt getting power to it . i found that...
1996 Dodge Ram 1500 Truck 5.2L 3-2-3 shift VIN: 3B7HF13Y6T
Let me start by saying I am not a trans guy.I got this truck when the trans shop said that it is not the trans causing the problem. When taking off from a stop the trans will shift from first to 2nd fine, it will shift into 3rd at about 45 mph, and at 50 mph i...
1992 Ford Bronco Custom 5.0L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1FMEU15NXN
Vehicle came in not running, heads already off by another shop. Customer wanted rebuilt heads, that he already had, put on. We suggested short block after seeing condition of cyl walls. Customer OKed. After assembly runs poor.Customer states vehicle ran fine b... Trouble codes: 126 (MAP out of self test range MAP has been replaced code now gone problem still exists)
1998 Ford F-150 4.6L blower motor
Hello all. About 3 months ago I replaced blower motor switch, the usual problem melted connector. Now whenever it rains the blower motor will run untill the battery drains!!!This is with keys in hand, truck parked outside. If it rains blower will turn on. I h...
1999 Ford Windstar LX 3.8L antitheft VIN: 2FMZA5143X
I have this windstar that sometimes wont start, if you have a flashing antitheft light it will not start, turn the key a few times and get the the antitheft light to turn out. it will start then. while looking at scanner, i noticed that if the pcm is verified ...
1986 Jaguar XJ6 4.2L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: SAJAV1346G
Problem started when the vehicle stopped running along the Pa. turnpike after driving about 70 miles with no problem. The customer said it lost power and the tachometer would bounce up and down. When it finally did quit altogether he said he thought it was on ...
1994 Jeep Grand Cherokee Laredo 5.2L No Start, Cuts out, Stall, Misfire VIN: 1J4GZ58Y7R
Hi Gents, Need a Jeep techs help, have a friends "heep" here a Consumers power meter reader truck that has a start stall condition when cold, after 1-1.5 hrs of run time the volt gauge reads 9.0v and the engine seems to run Ok. Shift points are are very incon...
1994 Mazda 626 DX 2.0L hold light VIN: 1YVGE22C5R
I have been troubled over this mazda 626 for over 3 weeks now. the customer brought the vehicle in complaining of shift problems and the hold light flashing. I replaced the maf senser and this solved the problem. when i removed my mtg2500 snapon scanner from t...
1994 Mercedes-Benz E320 3.2L Poor Idle Quality, Surge, Cuts out, Misfire VIN: WDBEA32EOS
This car was brought in for a running issue. The car was run nearly out of fuel, the tank was filled and driven for a short time with no concerns. After starting the car later in the day, the car exhibited poor idle and has continued to idle rough with the eng...
2001 Mitsubishi Eclipse Spyder GT 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 4A3AE55HX1
car came in with miss fire code po300 and running rough customer stated had washed engine and car ran fine after engine was washed but then about one hour later started to miss fire. we replaced spark plugs, igniton wire set new cap and rotor all factory oem p... Trouble codes: P0300
1999 Oldsmobile Intrigue GX 3.5L Unknown VIN: 1G3WH52H8X
Hello group, I have one here that is making me a little nervous.Last week this car came in with the customer complaining of a S.E.S. light on and the transmission was shifting very hard.Also the car would stall when it was put in gear. I drove the car to ver...
1989 Pontiac Grand Prix SE 2.8L Hesitation, Stall VIN: 1G2WP14W4K
Upon startup, the vehicle starts and idles perfect (around 900 rpm). Upon acceleration (whether slight or hard)idle sags and stalls. Once warmed up, if you hold TPS at 1-2%, vehicle while almost stall, then rpm instantly goes to 2000 rpm, then is fine, until r...

Fixes & Summaries for All Makes and Models
Fix/Summary Answers
2000 Audi TT 1.8L Quits running VIN: TRUUC28N5Y
found that someone had installed a satlite radio and while tring to find a hot feed for the radio bared wiring to fuel pump circuit was shorting behind fuse panel..
1997 Buick Riviera 3.8L Drivetrain VIN: 1G4GD2214V
Gentlemen Thank you for all your help this vehicle has left my shop without being repaired. Lawyers got involved and I have not been paid for my time. I received some good info from you guys and I think the problem may have been in the trans mount that the rac...
1990 Chevrolet S10 2.5L Excessive Emissions, Poor Idle Quality, Cuts out, Misfire, Poor Fuel Economy VIN: 1GCCS14E1M
There is no way I can give specific thanks for all the help I received so this is a final summary of repairs we did. Found #2 spark plug was cracked, #3 spark plug wire came apart, snugged up intake manifold bolts and checked for vacuum leak, backed the thrott...
2002 Chevrolet Silverado 1500 5.3L Stall VIN: 1GECK19T22
checked fuel pressure and fuel regulater every things checks out ok no problemsfound .also unable to verify problem again at any other time
1999 Chrysler 300M 3.5L Surge, Stall, MIL Lamp on VIN: 2C3HE66G3X
Special thanks to Morgan, Duane, and Chris for their assistance. Went in the next morning with scanner attached and scope back probed at the TPS. They both read .53 volts briefly and then they would jump up to 4.69 V on the reference orange wire. Found the Map... Trouble codes: 123 (Throttle position sensor voltage higher than expected).
1996 Dodge Neon 2.0L drive cycle problem VIN: 1P3ES47C4T
MANY THANKS TO ALL OF THE TECHNICIANS THAT RESPONDED! Most were right on target. A simple ECM reflash fixed the problem. I found out that this is a very common problem. The original programming set all monitors to not ready when the ignition switch was turned ...
1993 Ford E-350 Econoline 7.3L check engine light VIN: 1FDSE35F8Y
Thank you very much for the replies. We went over the wiring with a fine tooth comb from module to left bank wiring. We shook and bent all wiring and we could not expose any problems. We took parts of the wiring out of the loom where it was bent and found noth... Trouble codes: P1316, P1278.
1998 Ford Windstar GL 3.8L Hesitation, Surge, Misfire VIN: 2FMDA5144W
Thank you one and all! I took off the upper plenum, as 90% of the replies said, and found that the first four EGR pintles were plugged, leaving only #1 and #4 open, which was causing all the EGR flow to be directed to only 2 cylinders. This caused a lean out c... Trouble codes: P0304 (Cyl 4 misfire).
2002 Ford Windstar LX 3.8L fem VIN: 2FMZA51402
once again this network came thru!all the responses stated to ignore the code on keeo test-retest with engine running which i did & no codes present!!!i thought of this when 1 1st pulled the code but did not want to damage the fem doing a keeo test with the en...
1999 Kia Sportage 2.0L MIL Lamp on VIN: KNDJR7230X
This car has been on the road for a week now and the light has not come back on. The problem was the PSV selenoid. It must hold vac. when switched off and open when switched on. Ours was full open. Thanks to Alex for clarifing the testing procedure. Also thank... Trouble codes: P0440.
1988 Mercedes-Benz 560SEL 5.6L No Start, Stall VIN: WDBCA39D5J
The car now starts and stays running. Thank you to the 11 technicians who took time to reply to my request. Everyone who replied stressed the importance of a proper fuel pressure test because it is crucial for the operation of this mechanical injection. As it ...
1996 Mercedes-Benz S420 4.2L MIL Lamp on VIN: WDBGA43E6T
Thank you to everyone that replied the help I requested. I recommended R/R engine head to clean out carbon inside, the owner declined the repair. Thanks all. Trouble codes: P0410 (secondary air injection system malfuntion).
1998 Volkswagen Jetta GLX 2.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 3VWTD31H1W
Thanks for all your input. I was able to reset the throttle body without a scan tool. Simply run engine until it reaches operating temp., then unplug ECU for five min., start, allow idle to stablize and drive car at cruise speed for a few miles. Car runs great... Trouble codes: P1580 (Throttle actuator B1 malfuncution), P0103 (mass air flow circuit high).
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