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post #1 of (permalink) Old 01-19-2000, 01:28 AM
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slow engine

I have a 1990 ford bronco 5.8 w/e4od. I see that people with this type of engine can get their engines to rev up to 5000 rpm. My doesn't even come close. My will rev to about 3500 in gear and 4000 in park. Is their something wrong? Is it something I can do in the garage or do I have to take it in the shop. Any help will be appreciated.

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post #2 of (permalink) Old 01-19-2000, 08:46 AM
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Re: slow engine

Hey BlueBronco, just so we understand this right... In Park, your foot's to the floor, tach reads only 4000 RPM, and parts aren't flying through the hood?
Is it running smooth at this RPM or missing bad?
If it's running pretty smooth, and really is at only 4000 RPM at W.O.T. unloaded, I would probably check Fuel Pressure at the test port, to see if it's low. If it was, then the EEC may be maxing out on Injector "ON" duration, but still can't get enough fuel in to get to higher RPM. (I have a test gauge, so it tends to bias my troubleshooting towards using it early, and eliminating fuel delivery as a problem). You don't have any kind of restriction in the intake path, do you? Like when engine is OFF, foot to the floor, is the throttle plate wide open? No really grungy Air Filter?

If you think that maybe your tach is wrong, tell us what Diff ratio you have, and what size tires, and go 60 MPH in 3rd gear (lockout OD) and tell us what RPM you see. There are plenty of Bronc folks on this board that we can match equipment and see if your tach's measured RPM is in the ballpark.

post #3 of (permalink) Old 01-19-2000, 12:04 PM
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Re: slow engine

I saw a technical service bulletin on carpets/mats interfering with accelerator pedal travel. I know it applies to my 86, can't recall if it was still applicable to 90's. Ford actually has a modified pedal assembly that gives more travel. To check yours, have someone hold the pedal to the floor, engine off, mats in place, while you check to see if the throttle plate is fully open.

NormSpeed
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post #4 of (permalink) Old 01-19-2000, 02:35 PM
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Re: slow engine

Is the rev limiter kicking in? (can you hear the revs boucing up and down at the limit)


post #5 of (permalink) Old 01-21-2000, 05:52 PM
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help

can anyone tell me the best motor to build for my 85 bronco with some performance parts, the 302 or the 351w i have both?

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