why is this happening??
Thread Starter
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New User
Joined: Dec 2003
Posts: 11
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From: ross, tx
why is this happening??
i have a 93 f-150 with the 4.9L I6. when i am between 20 ad about 35 or so the engine wants to bog down like its getting to much gas i guess but i dont know what the problem is ive changed the fuel pressure regulator, and wires, plugs, rotor and cap and it still does it, also both of my fuel pumps in both tanks are whining i guess you could say why would they do that other than them going bad? oh and my truck has 157, 000 miles on it.
Posting Guru
Joined: Jun 2002
Posts: 1,288
Likes: 1
From: redding U.S.A.
my rear fuel pump has always been quite a bit louder than the front one. It's audible over the exhaust.
I would look into the EGR... Fixed my problem pretty good.
There's quite a few posts about the EGR causing hesitation or bucking, if you search, you're sure to find plenty.
good luck!
I would look into the EGR... Fixed my problem pretty good.
There's quite a few posts about the EGR causing hesitation or bucking, if you search, you're sure to find plenty.
good luck!
Thread Starter
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New User
Joined: Dec 2003
Posts: 11
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From: ross, tx
Trending Topics
Posting Guru
Joined: Jun 2002
Posts: 1,288
Likes: 1
From: redding U.S.A.
blow-by is pressure escaping past the piston rings.
The way to stop it is a rebuild
I would do a compression test before i labeled it as blow-by.
The way to stop it is a rebuild
I would do a compression test before i labeled it as blow-by.
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Joined: Jan 2004
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Check you throttle body and intake manifold gaskets. While the veicle is idling, spray staring fluid liberally on the gaskets. If it changes the idle it means you have a leaking gasket. As for the gas smell, it could be a leaking fuel injector, or it could be the computer reacting to the extra airflow from the vac leak.
