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FPR not working? 700 1988

posted by  Erwin on  Wed Mar 26 03:08 CST 2003
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last visit: Thu Oct 23 10:39 CST 2014
[RELATED]

I've had my 745t a couple of months and during that time have had a slight surging when accelerating which I've lived with to this point while taking care of other issues.

Soon after getting the car I pulled the spark plugs to check their condition and get a baseline for my records. Normal stuff I do, rich, lean, evidence of oil etc.

All the plugs were very clean but worn. Insulators were bone white. Too lean.
This morning I thought I'd disconnect and plug the vacumn line on the FPR just to see what the effect would be. Absolutely no difference in startup, cold or hot running, no power gain or loss and the surging was still present but amplified.

Guess I'll order a new FPR. This one looks like it could be original 185,000 miles). I'm basing that on appearance. It's shows the same amount of oxidation as the fuel rail and intake manifold.

--
Erwin in Memphis, '88 745t 183,000 miles, '95 855t For Sale








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    FPR not working? 700 1988

    posted by  fisher on  Wed Mar 26 03:18 CST 2003
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    I had the same symptoms with my 88 745t - surging and removing the vacuum line had little effect. I also did some O2 sensor readings and my car ran very rich even with a vacuum leak.

    After replacing the FPR, I have no surging, better fuel economy (1.5 mpg better) and a lot more power at WOT. No more detonation either.

    It's worth a try. If it isn't the problem, replacing the FPR is just a good thing to do anyways as they seem to get lazy as they get old.








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      FPR not working? 700 1988

      posted by  mfewtrail on  Wed Mar 26 19:48 CST 2003
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      on my 740ti, when the fuel pressure regulator went(after 217K..woo hoo!..lol), it made a louder than usual hissing type noise and was dripping a slight bit of fuel into the vacuum line. Hope this helps!








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        FPR not working? 700 1988

        posted by  Erwin on  Thu Mar 27 02:41 CST 2003
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        last visit: Thu Oct 23 10:39 CST 2014
        [RELATED]

        Mine isn't leaking, just seems to be tired. I've ordered a new one and should have by Saturday.

        Thanks,
        --
        Erwin in Memphis, '88 745t 183,000 miles, '95 855t For Sale







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