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Old 05-03-2013, 09:02 AM   #1
aberg83
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Long crank time. Advice?

When starting my car after it's been sitting for a while, it usually takes at least 5 seconds and many cranks to start up.

I replaced the fuel pump last weekend as the original pump was making a loud whining noise and I suspected it to be on its last legs. This did not improve the crank time at start.

I suspect maybe the fuel pressure regulator is bad. I will also replace the fuel filter which should be done anyways.

Any other thoughts?

Good advice for testing the FPR?
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Old 05-03-2013, 12:56 PM   #2
grant_jr
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When was your battery last replaced? Had this same problem when I bought my car and went away after I replaced the battery. Try having someone jump start your car and if she starts right up it could be the battery.
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Old 05-03-2013, 01:00 PM   #3
aberg83
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Quote:
Originally Posted by grant_jr View Post
When was your battery last replaced? Had this same problem when I bought my car and went away after I replaced the battery. Try having someone jump start your car and if she starts right up it could be the battery.
Since I'm getting cranking, I would assume the battery is fine, no?

I'm thinking it's a fuel pressure issue.
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Old 05-03-2013, 01:03 PM   #4
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That's what i am saying, i was getting crank but it was after about 8 or so cranks that the engine actually turned over. If all else fails try that.
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Old 05-03-2013, 02:25 PM   #5
Bullet Ride
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Get yourself a copy of the Bentley E30 manual, there's PDFs of it floating around the net
Attached Images
File Type: jpg hotstart.jpg (332.7 KB, 48 views)
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Old 05-03-2013, 08:27 PM   #6
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Does it crank too much both cold and hot? Run OK after it starts? Crank speed OK?

Try this:
When you go to start the car after it hasn't run for a couple of hours, turn the key just to the "On" position. You should hear the fuel pump run then stop. Now turn the key to start.
Does the engine still turn over several times before starting?

When you leap in your car to start it and turn the key all the way to start, your battery is trying to run two pretty hefty electric motors; the starter and the fuel pump (plus whatever you left on when you shut down last- blower, radio, seats, etc.).
See what happens when you ask it to run just one motor at a time.
The weaker the battery is the more you need to baby it and not ask for too much at the same time.

To test the FPR you need to tee into the system. Depending on the model you're looking for 2.5 or 3.0 bar gauge. (Bentley section 6.5) It'd be interesting to see how fast the pressure bleeds off after the engine is shut off and the pump shuts down. It should stay up for a really long time.
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Old 05-04-2013, 01:14 PM   #7
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Discovered that my vacuum hose between FPR and intake manifold had a small tear at one end. Trimmed it off and reconnected and she fired right up! I'll get a new hose soon.

I'd still like to investigate the fuel pressure soon.


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Old 05-08-2013, 06:38 PM   #8
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could be just dirty injectors, its cheap to find cleaned ones
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