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Re: How to tell if your fuel pressure regulator is (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Paul H. on April 04, 2000 at 02:34:16:

In Reply to: Re: How to tell if your fuel pressure regulator is posted by Richard V on April 03, 2000 at 21:14:45:

: Paul, I tried what you suggested. I can not notice any change in idle quality when removing (& plugging the vacuum line to the FR. On, Off, on, off not change. I did remove the purge valve & plugged it. Drove around the block and could not tell much difference. With or without the FR hooked up. Any other suggestions?

: BTW, the purge valve doe pulsate about 1-2 times a second

: Thanks, Richard V.

I can only suggest that you scrupulously check all vacuum lines for possible leaks. Some of the hoses are just a press fit, and may have hardened with age. Or they may be cracked.

Check that the rubber boot between the air flow meter and the throttle body is not cracked, and is well secured. Check that your dip stick is pushed well home (I think there is an O-ring which you could check). Check the crankcase vent hose. It is also possible there may be a leak at the intake manifold gasket, although I'm not sure how to check that.

Any stray unmetered air can cause drivability problems.

Otherwise, check plugs, distributor cap and rotor, leads, etc.

Regards, Paul.

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