Question about 2001 Volkswagen Passat

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Missfire engine missfires when idling

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  • joehayek Sep 13, 2008

    i have a 2001 passat 1.8 turbo early model. i've changed spark plugs 1 and 3 with the coils and later it agve misfire 2 and 4, i've changed the coils and spark plugs for 2 and 4 and now it gives 1 and 3. . . .

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I have a 01 passat and i have the #2 cyl. misfire. i changed the spark plugs. and i am goin to change the wires next, i was wondering if anyone else had this problem and what they did to fix it.

Posted on Jul 02, 2008

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DD-
A lot possibilities here, so let's narrow it down as much as possible:
How many miles on the engine?
Has it been well maintained, i.e.: oil changes, tune-ups?
Did the problem start all at once, or did it gradually appear?
When not idling, does the engine perform well, get decent fuel economy, use any oil?
If the engine is mechanically sound, I would suspect a disconnected or leaking vacuum line. Check under the hood with the engine on and listen for a "hissing" noise in the area of the intake manifold... If you have some extra vacuum hose, you can use that in the fashion of a stethoscope... put one end in your ear and probe around the vacuum line area with the other end. Any leaks will come in loud and clear this way.
Other posibilities include bad sensors, leaky fuel injector(s), uneven compression (usually due to poor valve sealing), blown head gasket or cracked head, poor manifold sealing, bad spark plugs/plug wires/distributor cap/rotor.
The good news is that most of the larger auto supplies now offer free computer diagnostic scans, which should help narrow down the range of possible causes and give you more detailed information as to what's going on u nder the hood.
Hope this helps and good luck with the Passat!

Posted on Jun 03, 2008

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