Solved!!! Crysler voyager -95 3.3l Backfiring in aircleaner ,New info!!

My Voyager is backfiring in the aircleaner at 3700-4000 rpm when i
drive it and if the gearbox is in park and i rev it up to the above
rpm. It starts to missfire slightly and if i press the gas even more
it will backfire so much that i even blown a aircleaner top off. This
happens almost everyday but sometimes it will run perfektly. I´ve
changed wires and plugs whith no change.
There is no error code in the "check engine lamp" only 55.

Is there someone that can help me, i´m going crazy over this.
I´ve read a lot about mis/backfiring here, but nobody seems to have
exactly the same problem as me. meaning at a specific rpm regardless
of load/uphill/downhill/decelerating/in-gear and so on.

Help please!!!!!!!!

Janne




Solution:

The CPS sensor (crankcase position sensor) was to close to the
flywheel, and due to
vibrations at the mentioned rpm it was thouching the flywheel and give
the computer
rubbish to work with. This resulted the ignition coils to send power to
the sparkplugs
at random, creating the hopeless backfiring in the aircleaner.
I just removed the sensor, cleaned it up a bit because the plastic body
had partly covered
one of the two brass pickups on the sensor. Put it back in the hole to
the bottom, and pulled
it back 0.098 inch (2.5mm) and fastend it.

And it works like a dream again!!.

Janne

.

Relevant Pages

  • Re: Shoulda gotten a light cycle
    ... speedo and the rpm counter. ... It's got input from the gear ... shifters that tell it which gear it's in, and a speedo sensor, and then it ...
    (alt.sysadmin.recovery)
  • Re: Over revving the engine - or bad rev counter?
    ... for about five minutes at 750/800 rpm. ... If, after the engine has warmed up, I adjust the ... driven from a sensor and not from the alternator. ... it's only firing on one cylinder - I'd have thought it would not be so ...
    (uk.rec.sailing)
  • Re: 1994 MB 300 idle surges when cold
    ... over 1000, you will hear a solenoid or switch kick in, the rpm will cut, ... sometimes stalling the engine, sometimes not, then the rpm will run up again ... A take it is the 104 engine. ... Until the oxygen sensor warms up, the engine will run in open loop ...
    (alt.auto.mercedes)