rev limter????
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Senior User
Joined: Mar 2006
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rev limter????
Started my bronco II up today, and was seeing the reaction time of the intake....doing this in sort bursts of WOT. Well for some reason the trottle stuck at WOT and was bouncing off the rev-limter for about 5 seconds before i ran in the truck to kill it. De-greased the trottle and that dont stik anymore. Rev limter seems to bounce at 6,500 which is deep in the red, only 500 from the last number on the tach.
Could there have been engine damage done to my engine from this???? Its a 1987.
Could there have been engine damage done to my engine from this???? Its a 1987.
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Senior User
Joined: Mar 2006
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2.9 1986 through 1990 had that motor.
It seems to run ok now, so i dont think anything bad happened. Bu im not sure, somthng could be waiting to happen.
Then again, thats what a rev limters for... to limit the engine speed so it dont blow up...LOL
It seems to run ok now, so i dont think anything bad happened. Bu im not sure, somthng could be waiting to happen.
Then again, thats what a rev limters for... to limit the engine speed so it dont blow up...LOL
Cargo Master
Joined: Oct 2004
Posts: 2,148
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From: Seneca, SC
I believe the 2.9 is an interference motor. If the thing was bouncing due to the valves hitting the pistons and that slowing it back down then you'll have your damage question answered soon enough. I'd think that the fact that it's running means that you're fine. A compression check would rule most of the problems out. If valves got bent then they won't seal and you'll have your answer.
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I dont think valves alone would slow down this engine, at wot. If there was contact...im sure i would have heard the metal crunching..LOL
The way it sounded, definalty means it had a rev limter. If you heard it, you would know just what i mean.
It stills run fine though, so im not worried.
The way it sounded, definalty means it had a rev limter. If you heard it, you would know just what i mean.
It stills run fine though, so im not worried.
Posting Guru
Joined: Sep 2004
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From: Yokosuka, Honshu, Japan
Yes, the 2.9's do have a rev limiter on them.... but the computer can be reprogrammed to remove that -- or you can get a chip that will "remove" it. What you experienced was the computer shutting off/on fuel and turning on/off spark. It's always best to clean up the throttle body / intake plenum and re-lube the throttle linkage, etc. 
