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analysis of failed emission test please 700 1991

posted by  Aye Roll on  Sun Mar 18 23:11 CST 2012
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last visit: Tue Oct 14 21:08 CST 2014
[RELATED]

My wife's 90 740T had a failed Fuel Pressure Regulator last year. Symptoms were mainly terrible cold start performance.

Yours may be just going bad. With high HC, it's either burning a pretty large amount of oil or it's just rich- and a bad fuel pressure regulator would do that.

Alternately I think any vacuum leak could screw things up enough to give you readings that are just a little off. A new intake manifold gasket is less than $5. (A lot less than a fuel pressure regulator for one of these, btw.)

Have a good look at all those crunchy old vacuum lines and elbows as well.

20 year old rubber parts are just about guaranteed to require replacement.

--Rob Bareiss, New London, CT
--
--Rob Bareiss, New London CT ::: 1992 244 250K ::: 1990 745T 301K ::: 1989 244 Turbo 285K






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