Question about 1996 Volkswagen Jetta

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Jetta no start, replaced plugs also

Black, It would start with not at all.

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  • gautmac Jul 16, 2008

    it started after disconecting the sensor. and then started a few times with it reconnected as well. we're gonna try it again in a few days thanks for the advce



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Hi - so the deposits were black. If the engine had started and the plugs were still black it would suggest an over-rich mixture, but if it wouldn't start they would probably be black anyway!

The only sensible way forward is to get a list of fault codes from the onboard diagnostic system and take it from there. You could either go to a VW dealer, or if you are technically minded you
could buy a £15 interface cable, download some free "VAG diagnostic software" and run it on a portable computer.
Generally a petrol engine needs fuel, a spark at the right time and some compression in order to run, but with computer controlled engines the timings and mixtures are all set by the computer based on data from the sensors. If any of the sensors or their connectors are defective the computer (ECU) will try to correct the system for a fault which might not be there.
I'm a bit worried about the use of ether / Easy Start sprays. If you car has a mass air flow meter just after the air filter it could be driven mad by the ether. If you want to try something simple, try disconnecting the mass air flow meter connector and see if it will start without it.

If these suggestions do help you solve the problem, please give my reply a rating to help others
judge my knowledge / guessing skills.
If they do not, please hold off on the rating and add a comment with more details so I can try to
help you further. Cheers, D

Posted on Jul 13, 2008

  • Richard Raynor Jul 16, 2008


    Glad it started. It sounds like the MAF is dirty, so doesn't record the correct amount of air is flowing over it, so the mixture is wrongly set.

    If you google for "VW MAF clean" you will learn a bit more about the problem. Disconnecting the MAF makes the ECU default to a factory setting which will allow the engine to run, but not terribly well. If you want it to run as well as possible a new MAF might be the solution; cleaning the old one is possible but the insides must not be physically touched or it will be broken. First of all, clean the connector and try that!

    Cheers, D.



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