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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 06-16-2009, 06:50 PM
1979Marshall 1979Marshall is offline
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Mein Auto: 1985 325e
Fuel Pressure Regulator

The Fuel Pressure Regulator in my car isn't quite doing its job as it should or at least I suspect there it is.

I've done some major overhaul on my fuel delivery system in the last few weeks. And while not horrible, the throttle response is ok. not horrible, but not great. Now every other sensor I could test out anyway related to the fuel system checked out. The fuel pump is good, fresh injectors, and fuel filters. Ignition is fresh as well. New Plugs, wires, and the rotor and cap have been cleaned out, although there was negligible corrosion. This leaves the fuel pressure regulator the only thing that I don't know about.

Have any of you had any issue with these and if so, what would be a good replace or upgrade even that won't break the bank. I could put the one off my parts car on, but if its gonna fail soon, why bother. Any good ways to test these things? I do have all sorts of pressure gauges, pipe fittings, and a compressor to fool around with.

Any help would be helpfull
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  #2  
Old 06-16-2009, 08:55 PM
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downhiller downhiller is offline
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i havnt tested one, but if i expected it to be goin bad, i just replaced it. i think they are under $20 for a direct replacement from any parts store. but if you want an upgrade, getting an adjustable fpr is nice, but they range from $100+.
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  #3  
Old 06-16-2009, 11:59 PM
tGunter tGunter is offline
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The new FPR on my mom's chevy cost about $65 for the part. I ruined the rubber gasket by putting fuel injector cleaner in with only half tank of gas. good job.
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  #4  
Old 06-17-2009, 04:59 AM
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dlmpsy dlmpsy is offline
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FPR's are different on "e" cars, so make sure you don't buy one for an "i". If you have access to a fuel pressure gauge you could always check the old one. Make sure the vacuum line going to the FPR isn't leaking. I had problems with my car once that showed codes for the fuel injection system and oxygen sensor, after spending a lot of cash it turned-out to be bad grounding points.
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  #5  
Old 06-17-2009, 08:29 PM
1979Marshall 1979Marshall is offline
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Cool. Gonna look into those issues and gonna pick up a new vacuum line for it tomorrow on the way home for work. For five bucks, why not? And thanks for the ray of hope with the 20 or so dollar part....its allways a hunt for affordable parts with this car.

-On a side note, the adjustable FPR.. is it worth it? I can't imagine it'd really do much for power.
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  #6  
Old 06-18-2009, 05:18 AM
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dlmpsy dlmpsy is offline
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The adjustable FPR isn't really worth the cash unless you have a car with some serious mods. Put the money toward a chip or maintenance issues.
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  #7  
Old 06-18-2009, 06:27 AM
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bimmerboy08 bimmerboy08 is offline
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Quote:
Originally Posted by tGunter View Post
The new FPR on my mom's chevy cost about $65 for the part. I ruined the rubber gasket by putting fuel injector cleaner in with only half tank of gas. good job.
out of curiosity, how did you know it was ruined? what was the car doing?
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The E30 is what all actual driving enthusiasts are after. It's an unpretentious machine, quietly capable of spectacular feats of handling. It's light, simple design is rugged enough to run against $400k rally cars, but on the street it' communicative chassis delights even the most disinterested driver. It really is one of the world's ultimate driving machines
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  #8  
Old 06-19-2009, 06:59 AM
1979Marshall 1979Marshall is offline
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dlmpsy, thanks for the heads up and I figured as much anyways and as there's allways maintenance issues........

And congrats on killing a chevy. Those Blazers are usually bullet proof, bomb, water, and redneck proof, but the lowly fuel injector clean kills it..
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  #9  
Old 06-19-2009, 11:20 AM
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dlmpsy dlmpsy is offline
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Since our cars are pretty old you'll start having dry-rotted or cracked hoses. The air intake boot is pretty common (often on the bottom side), under the intake there is another rubber part (not certain what it does or is called) that sometimes creates a vacuum leak, clamps loosen over time as well, connections corrode, etc. The point is that you have to eliminate problems. Another thing to keep in mind is that just because a trouble code says a particular part is bad, it doesn't necessarily mean that's the part. All these parts work as a system and there's no way to monitor every possible problem. BTW I had a FPR go bad once, it made a weird buzzing sound, probably because something inside was tore and the vacuum created the noise. If you don't have tools like a vacuum gauge, or fuel pressure gauge you'll have some guesswork to do, have you checked your TPS or Idle Control Valve?
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  #10  
Old 01-05-2013, 04:35 PM
nicholasb nicholasb is offline
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Where did you find a FPR for $20? Everywhere I look they're more like $60!
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  #11  
Old 01-06-2013, 01:45 AM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
Quantify fuel pressure B 4 you spend money on parts on spec
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  #12  
Old 01-06-2013, 09:04 AM
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INSANELY UNPREDICTABLE!
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What car is this were speaking of?
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  #13  
Old 01-06-2013, 09:21 AM
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INSANELY UNPREDICTABLE!
Location: in my house
 
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Mein Auto: 1984 318i
Check fuel pressure first as stated above^

Pressure specs: no load
318i/325i (43.5 +/- 0.9psi)
325e/es (36.3 +/- 0.7psi)

Pressure specs: engine load
318i/325i (40.6-46.4psi)
325e/es (33.4-39psi)
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  #14  
Old 01-06-2013, 01:02 PM
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hornhospital hornhospital is offline
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nicholasb bumped a three and a half year old thread to ask that question. When this thread was initially posted a FPR may have been available for ~$20.

I agree with TEST FIRST before spending money on things you only think you need. Read my sig. Guessing gets expensive.
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  #15  
Old 01-06-2013, 01:14 PM
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downhiller downhiller is offline
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Quote:
Originally Posted by nicholasb View Post
Where did you find a FPR for $20? Everywhere I look they're more like $60!
i knew some peeps
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