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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 04-24-2014, 09:59 AM
Ruby1987 Ruby1987 is offline
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Location: canada
 
Join Date: Apr 2014
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Mein Auto: 1987 325i
how to tell when fuel pressure regulator is going

My 325i 1987 BMW has been very reliable till now and I love it 454,347 miles with a second engine just did the timing belt 7 months ago. It is sometimes difficult to start but not usually. Last morning started fine went a ways , sort of died, lurching, sounding really bad, can eventually get it going and then it runs fine. Intermittent problem of this nature. Had a tank of gas with STP fuel injector cleaner and it ran fine. New tank of gas and it acted up
Mechanic said everything came out alright on diagnostic testing maybe it is the fuel pressure regulator.
Any comments
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  #2  
Old 04-26-2014, 10:04 AM
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BigBoy740il BigBoy740il is offline
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Location: Arizona
 
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Mein Auto: 1989/1991 E30; 2000 E38
Have you checked the fuel pump? Use a fuel pressure guage to test the operating pressure (engine running you should have 3.0 bar, about 43 psi) and residual pressure (engine off the pump and regulator should retain fuel pressure). Since a failing pump can give you the same symptoms, do this test first. In the process youll validate your pressure regulator.

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Last edited by BigBoy740il; 04-26-2014 at 10:07 AM.
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Old 04-26-2014, 07:59 PM
Ruby1987 Ruby1987 is offline
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Mein Auto: 1987 325i
Thank you, I must admit I have been dancing around the notion of it being the fuel pump mainly because I have heard that when fuel pumps go they go and there is no intermittent salvation so to speak. A garage said it would cost one hour shop time ie $90 to test the fuel pump . . . eek is that right?
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Old 04-27-2014, 10:24 AM
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toybuilder toybuilder is offline
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Mein Auto: 89 325i 2dr&DucatiMonster
Could just be bad gas or if you ran the tank lower than you normally do you may have picked up some debris in the filter on your fuel pump . Try putting some fuel line dryer in the tank some times you just get a batch of gas with a bit of more water in it .All of it has some, it's just the way they store it.
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