Automotive Technicians Technical Discussion and Fixes for Oct 9, 2013

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	Help Request	Answers
	2001 BMW 750iL 5.4L MIL Lamp on VIN: WBAGJ03421 First , thanks in advance. The help is always greatly appreciated. I have a few questions. Code 139 on my scan tool says it's an electronic thermostat, can't find anything on that only for a stuck throttle valve.I come up with a 139 = to P1580 so, is it a ther... Trouble codes: 139 (Electronic themostat), 115 (Hot film mass air sensor), 80 (Secondary air), 140 (Engine torque)	View
	2002 Buick Rendezvous CX 3.4L No Start VIN: 3G5DA03E32 This van will intermittently not start. When it happens, there is fuel pressure and spark. No injector pulse. It seems if you let it sit for awhile it will start back up. There are no codes present. It never stalls while running. It shows cranking rpm on Te...	View
	1995 Chevrolet Tahoe LS 5.7L 30 kv at idle VIN: 1GNEK13K7S Truck came in for missing and stalling. Found coil wire arcing to coil body. Tuned up and fine for now but firing 30 k at coil wire and 25k at plug wires at idle. Fuel trims indicate not lean and timing is correct. Receipts in truck indicate this has been happ...	View
	1996 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R1T Please help. We have replaced the fuel pump assembly on this Tahoe 3 times previously. Now it is back again. Vehicle originally came in as a no start. Checked spark and fuel. No fuel pressure. Easy, needs a fuel pump. We installed an aftermarket unit and repla...	View
	2002 Chevrolet Impala LS 3.8L Cuts out VIN: 2G1WH55K32 Thanks in advance for any help I'm pulling my hair out on this one. Car will cut out for a a second and then keep running. It will do it a t idle in the bay and also out driving under load. While this happens I loose communication with the scanner. As soon as ...	View
	2003 Chevrolet Tracker ZR2 2.5L No power VIN: 2CNBJ73473 Customer came in complaning of rattle noise in engine, and said when the oil was changed a screw driver had to be stuck in the drain hole to get oil to flow. Told customer noise was from chains and it may be do to sludge, recommended pulling valve covers to ch...	View
	1999 Dodge Dakota 3.9L Instrument panel VIN: 1B7GG22X4X Am under the understanding that the IP is supposed to be supplying 2.5V on the CCD Bus, which mine is supplying 9V. PCM has a code of P1268 for no bus messages from IP. Steering wheel radio buttons are inop as well as all fuel related info on overhead console ...	View
	2001 Dodge Stratus ES 2.7L cam timing Hi everyone, I have here a 2.7L that I have replaced the water pump on due to leaking out the weep hole, continously. At the customer's request, I replaced the timing chain while I was in there, and then decided to replace the guides, hydraulic tensioner, cam ...	View
	2005 Dodge Sprinter 2500 2.7L Altenator VIN: WD2PD74405 Please help. I can only find limited information on the charging system. I believe the problem is a missing field driver signal, but cam't find out what the signal or voltage should be. Also is there a way to excite the field winding externally.Thank you all i...	View
	2006 Dodge Ram 3500 SLT 5.9L Service engine lite p0341 VIN: 3D7MX48C96 This is at my sons shop and it is setting a p0341 and if I watch the scanner cam and crank it looses the cam signal to 200 rpm at idle while the crank stays around 750rpm. This signal will bounce back and forth at idle only. If I rev it up to 1500 t0 1800 the ...	View
	2002 Ford Explorer XLT 4.0L Poor Idle Quality, Cuts out, Stall VIN: 1FMZU73E42 Vehicle has intermittent stall and/or low idle concern. Symptom is worse when in gear at a stop compared to just idling in park/nuetral. Symptoms get worse when vehicle is warm or hot. Idle fluctuates always, but never more than 100 or so RPM, between 650 and ...	View
	2007 Ford F-150 XLT 5.4L No Start VIN: 1FTPW14V57 Not sure what to do with this truck. Long crank time when cold. When you try to start in the morning it will keep cranking for 15 to 20 seconds without starting. Once it starts it runs fine and will restart immediately there after. Scanned and looked at every ...	View
	1998 GMC Sonoma SLE 4.3L Cuts out VIN: 1GTCS19X7W car came in with a misfire problem. custumer had coil and module so we repalced those and made no differance. scoped cam sensor and found dropouts so replaced it then test drove and worked fine. next day upon startup truck runs like it did when it arrived. so ... Trouble codes: P0300	View
	2005 GMC Sierra 1500 SLE 5.3L windows, door locks, radio, dome light VIN: 1GTEK19B15 Hello all. This is my first inquary, hope all is well. 2005 gmc pick up 5.3 4x4. cust states drove fine to home, next morning would not start. security light on radio was inconsistant at first, now non existant. truck will crank and fire, then die. power windo...	View
	2007 GMC Yukon XL 1500 SLE 5.3L gauge cluster VIN: 1GKFK16337 customer came in stating at night, the back lighting on the gauge cluster will flicker and is very hard/ near impossible to see regardless of potentiometer position. however, the HVAC control, radio, dimmer switch and radio control buttons on steering wheel fu...	View
	2000 Honda Accord SE 2.3L Door Adjar Indicator VIN: 1HGCG5649Y The door adjar light on the cluster will flicker when the engine is reved up. I found a loose ground behide the dash panel and tighted the loose bolt, I then rechecked adjar light by reving the engine and it would flicker on and off but not as often. So I then...	View
	2001 Honda CR-V SE 2.0L Code VIN: JHLRD18771 I have not had this much trouble with a Honda stereo before: We had replaced the transmission and then called the dealer with a serial number from the glovebox and received the code. When we punched in the code the stereo did not accept it. We asked the custo...	View
	2003 Hyundai Accent GL 1.6L Trans VIN: KMHCG45C23 Well lets throw this out there and see what comes back idea wise. The trans keeps blowing fluid out the breather tube on top buy bellhousing had a dtc po1709 trans kick down sen. Tested and replaced now code is gone but still pushing fluid out breather when dr...	View
	2000 Jaguar XK8 4.0L MIL Lamp on VIN: SAJJA42C4Y trying to determine if the cat is bad seems its bank 2 which is drivers side as per my books Trouble codes: P0430	View
	1998 Lexus ES300 3.0L evap VIN: JT8BF28G2W customer brings us a vehicke which has been to 3 different shops in an effort to correct a [...].the car has had the canister,vsv,pressure sensor vacuum hoses all replaced.The gas cap was also replaced.We smoked the system but no leak found. Am starting to...	View
	2003 Lexus RX300 3.0L MIL Lamp on, vsc light on VIN: JTJHF10U93 Got this truck in, working fine. Passed smoke test, no wisps anywhere and flow ball dropped to 0. Function checked purge valve and canister shut valve, both passed. Replaced a 2" section of hose that had visible internal cracking, no improvement. X-431 won't c... Trouble codes: P0441, P0442, P0446	View
	1980 Mazda RX-7 GS 1.1L no spark VIN: SA22C58361 car came into shop with a noisy transmission and a hard start condition when cold road tested and noted noisy trans bearing installed used trans on road test car lost about half the power checking the ignition with a vantage scope could see that 1 coil stops w...	View
	1975 Mercedes-Benz 450SL 4.5L Valve adjustment VIN: 1070441202 Car came to us running bad and we ended up putting injectors in to the car and it ran fairly good. car has low vacuum at 4 inches, but compression is 120 to 135 psi on all cylinders. It still floods the plugs and has no power so I checked the valve adjustment ...	View
	2003 Mercedes-Benz SL500 5.0L misc VIN: WDBSK75F63 Hello all, This car has a vibration that can be felt in the body at anytime the vehicle revs higher than 1500 rpm. It may occur lower than that, but perhaps not severe enough to be felt. It is most noticeable around 2800 rpm (approx.) It happens in park/neutr...	View
	2004 Mercury Grand Marquis GS 4.6L Poor Idle Quality VIN: 2MEFM74W04 Thanks for reading, gentlemen! We've got a great customer of ours that would really like this issue resolved. This Grand Marquis was originally brought in because it wouldn't idle, i.e. would start, run momentarily then die. Quickly found that the IAC valve w...	View
	2004 Oldsmobile Bravada 4.2L MIL Lamp on VIN: 1GHDT13S14 This problem is intermittent. Check engine light would come on with this code about every 50 miles. The light would even go out on it's own most of the time. The first thing I did was simply replace the map sensor with no test. (most common failure) Customer r... Trouble codes: P0106 (Map sensor performance)	View
	2001 Pontiac Sunfire GT 2.2L transmission VIN: 3G2JB52481 transmission either slips in and out of second gear or is downshifting. this happens as soon as into second. it feels like it is going in and out of second. observing data stream for trans shows nothing abnormal. misfire data stream shows all cylinder misfire ...	View
	2004 Porsche 911 Carrera 3.6L speaker VIN: WP0BA29954 Approximately every two minutes there is a quick series of 4 beeps that I believe comes from the right side of the dash. Possibly the speaker. This is not the normal chime sounds from under the driver side of the dash as I have activated those with a scan tool...	View
	2000 Saturn SL 1.9L No Start VIN: 1G8ZF5281Y We are in the process of reflashing a 2000 Saturn. The OE pcm went bad, GM doesn't carry this PCM anymore so we were forced to get an aftermarket unit. After many attempts to reflash we keep getting error code E 4401 Reading vin from device or controller faile...	View
	2004 Subaru Outback 2.5L rt ft cv axle VIN: 4S3BH67564 Customer came in for a knocking noise upon accelerating straight and more pronounced turning right. We replaced the right front axle, problem went away. Customer came back a week later hearing the same noise, replace again with the same brand (Advance Auto) an...	View
	2006 Toyota RAV4 Limited 2.4L Poor Idle Quality, Stumbles VIN: JTMZD34V26 Got a Rav4 here that the idle speed stumbles or drops when the ECM activates the electric cooling fans. Progressively getting worse. Alternator output good and battery test good. I want to suspect excessive current draw by the cooling fans but my suspicions ar...	View
	2002 Volkswagen Passat GLX 4 Motion 2.8L Oil Pressure VIN: WVWYH63BX2 Oil warning light and buzzer comes on intermittently. I have been off and on for the last month or so. The customer and I have narrowed it down that the light/buzzer comes on during light accel, under 2000 RPM. About two years ago I replaced the right chain te...	View
	2003 Volkswagen Passat GLS 1.8L No Start VIN: WVWPD63B73 Vehicle cranks no start has fuel pressure. No power to injectors (fuse 29) no power to fuse 32 and 34 when cranking. We have another passat for comparison and fuses 32 and 34 are powered when cranking. We are not clear as to chain of events came from another s... Trouble codes: 01314 (No ecm Comunication), 0316 (No abs Communication)	View
	2004 Volkswagen Beetle GLS 2.0L 1-2,2-3,3-4,4-5 harsh shifts VIN: 3VWCM31Y24 The vehicle came in with harsh shiffting 1-2, 2-3, 3-4, 4-5 gears. we scan the computer and found a code 01045. the code directed us to a faulty tiptronic switch that would read error on the scanner when it dropped to the standard postion then continue to read...	View
	2006 Volkswagen Beetle 2.5 2.5L oil pump VIN: 3VWRF31Y86 Oil warning light is on all the time while the engine is on and idling. Bypassing oil sender w/ mechanical gauge show 65 psi @ idle. This happened after I finished replacing a/c evaporator unit under dash. Every wire is back where it is suppose to be except th...	View
	2008 Volkswagen Passat Komfort 2.0L Misfire, MIL Lamp on VIN: WVWAK73C58 This vehicle was towed into us with a rough running problem, after first scan and misfire monitering we had cyl. 3 was dead, and intermittent codes for cyl. 1 and cyl. 4 misfires. after swapping plugs and coils around and a compression test we diagnosed faulty... Trouble codes: P0300, P0301, P0304	View
	2003 Volvo XC90 2.5L not sure VIN: YV1CM59H33 Help I have a 2003 volvo xc90 with a vibration from the rear(feels like it) Both front axles have been replaced with new ones from volvo dealer. Rear dirveshaft has been removed and car driven still vibrates. Vibration is quite bad at 62 mph and up. All wheels...	View

Fixes & Summaries for All Makes and Models

	Fix/Summary	Answers
	2000 Audi A6 Quattro 4.2L Timing Chain VIN: WAUZL64B0Y Thank you Gentlemen for all your suggestions, pulling the front end off an A6 3 times is not my idea of a good time, however you all gave me alot to think about and the third time was the last. The key to the solution and the confusion was in Alldata's diagram...	12
	1998 Buick LeSabre Custom 3.8L starter & fuel controll VIN: 1G4HP52K2W Thank you to everyone who replied.I cut the wires under the steering column between the ignition switch main connector & Column; two small white wires, housed in orange(NOT YELLOW)sleeve soldered in a 1.86K ohm resistor to the vehicle side of the harness & per...	15
	1995 Chevrolet K2500 Suburban 7.4L Poor Idle Quality, Hesitation, Stall VIN: 1GNDT26N3S Sorry it took me so long to reply. I am a newbie, and could not figure out how to re-reply. Balancer is dead on at TDC. Timing is set to spec at 4 degrees. Fuel pressure is 28 psi. throttle body gasket replaced. all distributor parts replaced with GM par...	36
	1998 Chevrolet Express 1500 LS 5.7L No Start VIN: 1GBFG15R8W Thanks guys Leon, Tim, & Alex were right on the money.If you lay on your back and look straight up at the passenger side of the steering column you wil see the wiring to the module. It's kind of hidden. Thanks to Alex on the tip using the resistor.The customer... Trouble codes: B2960.	6
	2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13W6Y Thanks for all the help every one. we have and are currently trying all suggestions. The Lifter/valve noise is getting better with every thing we are trying and has become more and more intermittent. customer is currently driving vehicle and keeps us informed ... Trouble codes: P1351, P0300.	30
	2004 Chevrolet Silverado 2500 6.0L No Start, No Communication VIN: 1GCHK24U34 My apologies for not closing this request sooner. After getting acquainted with the operation of the LineSpi and scoping the various modules, I was able to plod my way through the problems. Hooking up the labscope to pin #2 showed all kinds of 7 volt signals e... Trouble codes: U1000 (Class 2 Data Link), U1300 (Class 2 Data Link Shorted), U1301 (Class 2 Data Link Shorted), U1305 (Class 2 Data Link Low or High).	7
	2004 Chevrolet Silverado 1500 LS 5.3L Unknown VIN: 2GCEK13TX4 I replaced the clutches in the transfercase and the noise went away. Thank you for all your help. I own a set of chassis ears that pointed me in the right direction.	17
	2006 Chevrolet Uplander LS 3.5L stuck 2nd gear VIN: 1GNDV23L96 Thank you for the help, I had a pinched harness. Repaired it and all seems well. Thanks again.	1
	2004 Dodge Durango Limited 5.7L Mechanical VIN: 1D4HD58DX4 Thanks for all the help, we called the motor rebuilder who said there was no way it was doing that. Long story short returned motor, got a different motor from another rebuilder. WORKS GREAT!!! Don't know for sure, but think they gave us a motor with MDS lif...	26
	2002 Ford Explorer XLT 4.0L fuel pump VIN: 1FMZU63E32 Thanks for your help. I went ahead & replaced the fuel pump & filter. It's been 3 weeks & so far so good. Happy wrenching.	11
	2007 GMC Acadia SLT 3.6L Park Assist VIN: 1GKEV33737 Ok here we go everyone is on the same tsb with the daisey chain xmas tree repair. All of us old high tech guys want to see the data transfer and determine what one is bad from the signal results, Scrap that Idea It drives you nuts Had a 4 chanell lab scope ...	3
	2007 GMC Sierra 1500 SLT 5.3L transfer case VIN: 1GTEK19017 Thanks to all.The grounds were coroded and we had to replace the shift motor.When power applied it would only work sometimes.	6
	2001 Infiniti QX4 3.5L check engine light on VIN: JNRDR07Y31 Closing now and I want to thank all the helped. Customer [they are a long term customer] has not committed to any more time,they said they would make that decision when it needs to be smogged as it still runs very well. Please don't be critical to other poster...	20
	2004 Mazda MPV ES 3.0L pcm blank VIN: JM3LW28J64 Thank you for the ideas and input. The PCM was non recoverable and had to be replaced. The new PCM comes pre programmed but the pass lock module has to be replaced also. This requires two good chipped keys or the system will not program the pass lock system to...	3
	1999 Mercedes-Benz S420 4.2L close assist VIN: WDBGA43G4X Thanks for the help guys! This vehicle is fixed! I took the door panel off and sat inside while closing the door, and heard a very small hissing noise from the pressure hose! It was a small crack right next to the window motor, small enough to pass a vacuum te...	8
	1999 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G2NE52TXX it was as atn members advised.pcm was shorted on that driver and R&R pcm and all is good Trouble codes: P0200.	12
	2007 Pontiac G6 GT 3.5L No Spark VIN: 1G2ZH58N87 Apparently my spark tester was not working or shorted to ground I had spark the whole time poor fuel caused this vehicle to not run at all. flushed fuel system and put fresh gas in and all is ok at this time. Thank you all for your help.	6
	1991 Rolls Royce Silver Spur 6.7L Fuel Door VIN: SCAZN02A7M Hi there. This car is supposed to return at sometime but I don't think that the customer is in a big rush to have this problem solved. Thank you George, Cedric, Ted, Kraig, Jeff and Ken, whose replies are as listed. I was unable to obtain a wiring diagram for ...	7
	2000 Toyota Avalon XL 3.0L Oil VIN: 4T1BF28B7Y THANK YOU TO ALL THAT REPLIED TO THIS POST. SEEMED LIKE A COIN TOSS TO WHETHER A CLEANING WOULD HELP. LONG STORY SHORT, THIS VEHICLE WAS BOUGHT AT AUCTION AND PUT ON OUR CAR LOT. RUNS GREAT WITH NO NOISES OR MISFIRES. JUST CONSUMES OIL. DIDNT REALIZE THE OIL C...	13
	2003 Toyota Echo 1.5L iac? VIN: SCP1003773 ok i ve fixed this little bugger by changing the whole throttle body .thanks to all who helped me out .charlie	9
	2003 Volkswagen Passat GL 2.8L Misfire cyl #3 VIN: WVWTH63B63 Yes this VW is fixed and the customer is very pleased. The only thing that we could find common to only cyl #3 is that the fuel pump feed line to the injector rail is right above the cyl #3 injector. (Note we had already checked the pressure and it was fine... Trouble codes: P0303 (Cyl 3 misfire.), P0300 (Random mult. Misfire.), P0421 (Cat converter efficiency b1), P0422 (Cat converter efficiency b2).	13

(Also Available: All, Asian, Chrysler, European, Ford, GM.)