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surge, chuggle or miss
Posted by TomA (more from TomA) on Fri, 25 Mar 2005 14:03:59
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1993 9000 CSE Turbo Manual trans
engine under 100k miles, car at about 230k.
This car has developed a surge, or minor miss. It will miss maybe a
couple times per second when cruising under light throttle. It is a crisp, short, miss, similar to an ignition miss, but not nearly that intense.
It does not miss until the engine is at least partially warmed up.
It does not miss under load, ie when the turbocharger pushes manifold pressure into the positive range.
Since it runs well and strong under load, I don't believe it is anything
like the fuel pump or filter. Nor would I think of it being a weakness
in the ignition, since it pulls great under load. I see no vacuum lines
disconnected, or otherwise open to the atmosphere; even though with this
car having a MAP sensor, that shouldn't really matter anyway. (RPM + MAP
information gives absolute air volume taken in.)
Any more clues, or disagreements with my assumptions? Thanks.
posted by 192.61.21...
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