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Off Idle Engine RPM Problem/title>

Off Idle Engine RPM Problem

Related, to Exhaust Gas recirculation, in TPI engines

With an "off idle engine RPM problem" in a fuel injected engine, a tendency to stumble when at idle, or stall at stop lights, is evident.  One poster, threatened to sell his converted Jag, because of its propensity to die at stop lights.  After fighting with the problem for the last 15 months it seems an a solution has been found.

Technical postings from a listserve, encountered a thread about EGR valve problems on older TPI engines.  We began rechecking air flows and discovered the EGR valve was apparently worn and partially opened under idle conditions.  Further, the Idle Air Control valve was partially sticking. 

The computer was trying to adjust air flow but couldn't maintain smooth idle.  After plugging the vacuum line to the EGR the problem diminished markedly.  Both valves were replaced and the cat is finally stable.  It looks like the gremlin has finally been vanquished.

If you are encountering similar problems, test the EGR.

Edited from a posting to mail list


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