Question about 2003 Volkswagen Passat

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Runs rough only at idle

The car runs fine unless i am stopped and it almost wants to stall out while at a stop light. And it gives out a really bad gas kinda smell.

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  • Volkswagen Master
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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

SOURCE: runing rough for 1 min. after start cold engine

95 vw golf 2.0l. engine blue smoke

Posted on Nov 01, 2008

  • 225 Answers

SOURCE: engine idle incorrect nearly stalls runs on 3 cyl on low rpm

Best way is to get the fault codes read using a £15 interface cable and VAG-com software (£free) on a laptop computer. It will save you money. In the meantime, have you removed and examined the spark plugs?
Hope this helps you a bit. If it does, a "Fixya" rating would be much appreciated. If it doesn't
help you, I'd be grateful if you didn't bother with a rating at present - they can't be increased later if I do manage to solve your problem! Just come back and tell me what you found. Cheers, D

Posted on Dec 03, 2008

ourhowse
  • 2007 Answers

SOURCE: Idling low when stopped at a stop light. Almost stalls.

It certainly could be vacuum leaks. Check all your mounting bolts on the intake manifold, as well as all vacuum hoses. Make sure they aren't loose and are in good condition. Use a stethoscope, or a lenght of fuel hose held against your ear to listen for vacuum leaks while the engine is running. A hissing sound will be heard. Be sure and wiggle them if you can, while you're checking. A soapy water solution will also detect leaks.
It could also be the EGR valve leaking, or a plugged PCV valve. Or your timing belt could have jumped again. Let me know how you make out. Good luck!

Posted on Apr 29, 2009

samspelljr
  • 62 Answers

SOURCE: car dies-hard to start

EPC= electronic pedal control it is a sensor and is located in front of the brake pedal . Depress brake with one hand ,the sensor with the other and release fast. this should disengauge the EPC lock listen for a thunk made by the EPC lock disengaging.

Go to auto zone. They will use a code reader to help you find exact component or components having errors. If its not the EPC.
it sounds like your mass air sensor or the throttle control sensor may be bad. Your gas and air may not be mixing properly thus causing your car to sputter, hesitate, and idle rough. It could be some other thinks like a bad plug or wire etc. Good Luck hope this helps. Please rate me if this helps thank you.

Posted on May 15, 2009

  • 101 Answers

SOURCE: 1989 VW cabriolet, fuel odor, engine stalls in 1st and 2nd gear

Ignition system sounds probable on vhicle when everything gets warmed up. High pitched hum could be bad tire or worse bearing.

Posted on Oct 02, 2009

Testimonial: "Thank You for your response. The huming sound is present on idle from start-up,tires have just been replaced, would fuel pump be suspect?"

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