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Fuel Pressure Regulator, 745 Turbo Wagon 700

posted by  gentleman5926 on  Sat Nov 12 14:49 CST 2011
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last visit: Wed Feb 22 20:40 CST 2012
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Just a quick note for opinions: The other day had idling issues (would not idle at all)... it seemed to clear up on it's own. While under the hood and car idling, disconnected the FPR vacuum line and the car seemed to smooth out a LITTLE bit (a small "miss" seemed to disappear) but otherwise there was NO effect on the car's running. When the vacuum line was replaced it seemed to start idling a LITTLE rougher, but very little change in idle at all. REPLACE FPR?? Any opinions would be greatly appreciated, thanks.







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ANSWER Your FPR is worling normally 700

uid 18083's pic
posted by  lucid on  Sat Nov 12 15:07 CST 2011
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last visit: Fri Oct 24 12:31 CST 2014
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When you took the vac line off you should have plugged it. If you didn't, the mixture goes lean from the air being sucked in, and idle speed will tend to rise until the IAC valve corrects it.

In any case, with the vac hose off, the FPR is exposed to atmospheric pressure (as with a Wide Open Throttle) so it raises the fuel pressure by about 9psi from what it was at idle. This richens the mixture, perhaps making the idle a little smoother.


--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

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