3.2 backfire/predetonation problem
07-07-2002, 03:12 PM
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Track Day
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Join Date: Apr 2002
Location: Manassas Va
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3.2 backfire/predetonation problem
Okay Guys,
I've been running the car to burn off the extra oil that was sucked into
the engine and have had great success. Also still breaking in the engine
from the rebuild. Actually once the airflow meter was replaced the thing
has run like a champ until this morning. It ran great, still a bit of a
rough idle and a little low on the RPM's but okay. Ran strong in higher
RPM's but just before shutting it off it backfired once and cut out. I
had reved it up to about 3500 RPM's and it was coming back down by
itself and then backfired and died. It now starts but has a
pre-detonation (for lack of a better description) sounding like it's going into the intake plenum but
only on one side.(1,2,3 cylinders) No knocks or smoke but just a strong ping sound inside the
plenum like it's getting spark inside the intake. Not on every stroke
but frequent. I listened real close and it's definitely only on one side
of the engine and the plenum gets hot from the detonations. Any
suggestions or ideas? This is an '84 with motronic. New caps and wires
and rotor. New plugs, new DME relay, new airflow meter, new fuel filter,
rebuilt engine. Any chance the timing speed sensor or reference sensor
came loose and needs to be adjusted? Any other ideas?
Dan O
I've been running the car to burn off the extra oil that was sucked into
the engine and have had great success. Also still breaking in the engine
from the rebuild. Actually once the airflow meter was replaced the thing
has run like a champ until this morning. It ran great, still a bit of a
rough idle and a little low on the RPM's but okay. Ran strong in higher
RPM's but just before shutting it off it backfired once and cut out. I
had reved it up to about 3500 RPM's and it was coming back down by
itself and then backfired and died. It now starts but has a
pre-detonation (for lack of a better description) sounding like it's going into the intake plenum but
only on one side.(1,2,3 cylinders) No knocks or smoke but just a strong ping sound inside the
plenum like it's getting spark inside the intake. Not on every stroke
but frequent. I listened real close and it's definitely only on one side
of the engine and the plenum gets hot from the detonations. Any
suggestions or ideas? This is an '84 with motronic. New caps and wires
and rotor. New plugs, new DME relay, new airflow meter, new fuel filter,
rebuilt engine. Any chance the timing speed sensor or reference sensor
came loose and needs to be adjusted? Any other ideas?
Dan O
