No Power

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Oct 14, 2003 | 08:25 PM

pdc3828

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Joined: Apr 2003

Posts: 13

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No Power

I have a 91 Bronco with a 351. When i start it up the idles goes up around 1500 and it doesn't go back down. i also notice that the check engine light is on. Sometimes the idle goes up and down a lot and it almost wants to die. But when the check engine light goes off it goes back to normal idle and it runs fine. Now my check engines stay on and it doesn't go off. I could smell a lot of fuel burning. When i put it in drive, the truck seems to have a lack of power. The truck barely moves foward when i have the gas pedal pressed pretty far. Even at high idle my truck barely moves. So far i have the throttle body and tps sensor replaced. also the fuel pump, fuel regulator and fuel filter. It feels like it running on 2 cylinders. It feels really weak. I have no clue what might cause this.

Oct 14, 2003 | 08:31 PM

BigRyanKP

Senior User

Joined: Oct 2003

Posts: 268

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From: New Hampshire

how bout the map sensor have you checked that... it could cause your timing to get out of wack and cause you to lose power.

Oct 14, 2003 | 08:37 PM

1ruralmailman

Mountain Pass

Joined: May 2003

Posts: 117

Likes: 2

From: upstate new york

i had the same truck,with similar sounding problem. trouble turned out to be a bad intake manifold gasket.word to the wise,if this is the case.get a high quality gasketset. either go motorcraft,or napa top of.the line. tried saving a few bucks with elcheapo autozone set, got to redo the job 5000 miles later.

Oct 15, 2003 | 12:54 AM

pdc3828

Thread Starter

New User

Joined: Apr 2003

Posts: 13

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Would a busted intake gasket cause the check engine light to go on. also how would a gasket leak cause the truck to lose that much power that it causes the truck to barely go anywhere

Oct 15, 2003 | 10:53 AM

Kemicalburns

Hotshot

Joined: Jul 2002

Posts: 14,285

Likes: 12

From: Bend,OR

have you checked your plug wires and plugs. you might try and start the rig at night and look under the hood for any plug wires arching. this will cause similar problems to what your talking about. may be time for tune up to

Oct 15, 2003 | 07:53 PM

1ruralmailman

Mountain Pass

Joined: May 2003

Posts: 117

Likes: 2

From: upstate new york

when the gasket went,there was around 1.5 inches gone. this allowed enough oil,and antifreeze to go down the throat that it fouled two plugs instantly. this tripped the light, and stopped the beast from mooving under its own power.