engine studders when you rev it
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Elder User
Joined: Jul 2004
Posts: 715
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From: Long island NY
engine studders when you rev it
On my 302, if you tap the throttle in neutral to give it a lil rev, it sounds like it hiccups or something and it dosnt rev smooth. its like vrr.....rrrrooomMM instead of vrrooOOOMM haha. what could cause this? it drives fine, and if you move the gas petal slower it revs up fine and revs fine when your moving too., anything to worry about?
Senior User
Joined: Jun 2003
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From: Rose City, MI
if its fuel injunkted then you might be lookin at a few culprits such as dirty injectors, bad tps, dirty iac valve, or maybe and this is a big streach but it could also be a bad pcv valve. my 89 van does that too but i haven't cared enough to fix it yet.
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Elder User
Joined: Jul 2004
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From: Long island NY
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Senior User
Joined: Jun 2003
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From: Rose City, MI
have you replaced any parts yet? Might want to start with the tps. Also pull codes and see what comes up if any.
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Senior User
Joined: Jun 2003
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From: Rose City, MI
the throtle position sensor (tps) thould be connected to the butterfly on the throttole body. its a little piece of plastic with 2 or 3 wires comeing out of it. usually directly across from the throttle cable. (just guessing)
Elder User
Joined: Nov 2004
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From the sounds of it it is the timming. And the best way to time a vehicle is with a timming light, but if you don't have a timming light you do trial and error. You loosen the distributer, set it so the truck idles smooth, then tighten the distibuter go in the truck and push the peddle fast. If the truck studers like you were describing then timing is a little behind,and you would losen the distributer and try again. But if the truck responds well (revs up instantly) then timming is either exact, or advanced. When you time a vehicle by ear you may not get it exact, but you can get it close, and you can get it to respond exactly the way you want. For example, if you were going to use the car/truck for drag racing then leave it a little advanced so you get that instant response, but in a situation like mine (81 f100 manual 4spd od) a fast response is not the best on icey roads, becouse of the manual trans you will spin tires alot. so with my truck I like it to respond a little slow, so i don't spin tires. But with my other vehicles, I like to have timming advanced a little bit and then I am always the first one through an intersection.
hope this helps
hope this helps
Posting Guru
Joined: May 2004
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From: Billings Montana
Another thing, when you time the engine by ear, after you get back into the truck and rev it up, listen for pinging under load. If the engine pings when you push the gas down, back the timing down a little bit until you get it to stop. Once the pinging stops, tighten down the distributor and have fun.