Question about 1991 Ford F250

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The idle is too high and it is making a rattling sound when you give it gas not a knocking sound like something needs to be cleaned or a leak somewhere i have a 91 ford f250 2wd

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Check your throttle cable/sensor position. If you have an earlier model carb, then you might want to check that the idle screw is not to advanced.

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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1996 ford escort lx engine runs to fast


If it idles high, with it in park, block off mouth of throttle body with something, it should kill the engine. If very little or no effect on idle, you have false air getting in there from somewhere.
Make sure throttle valve is closing, where applicable, take throttle cable loose, see if idle returns to normal. Check and clean idle air system. Any applicable trouble codes?

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Can be several things. I want to say spark knock. Don't remember if your engine came with a Knock sensor.

Also stretched timing chain or weak timing chain tensioner. Another term to look at is "valve rattle". This would give you closer to a machine gun sound than other things.

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If there is no "Check Engine" light try a bottle of good injector cleaner in your gas, or cleaning the throat of your throttle body with a good spray cleaner. If the "Check Engine" light comes on then put it on a code scanner and that will point you in the right direction.

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I have a 2000 ford mustang v6 I was putting 89 octane gas in it. my manual said to burn 87 octane so i'm burnning 87 now .but when I accellerate I get a knocking, rattling sound took it to a ford dealer...


Humm, give it some time. there are upper cylinder cleaners, but I worry about converter damage, and oxygen sensor damage. The lower the octane, the hotter and more masssive the burn, exactly backwards from what you would think, but higher octane is slower burn and av.gas is really, really slow.
Ford has had slow to start issues that traced back to drivers using too high octane....

Still, if it keeps pinging, you may need to run higher than spec octane.
I would have thought that your car would have knock sensor that would trim this issue...

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I have 1998 Infinti Q45t 4.1L V8, It has 202,750 still runs great except you can hear little knocking sound when idling. Is that bad if you hav knocking sound from engine?? So do you think that we can fix...


a knocking sound in an engine is never good. with a high mileage engine things start to get worn. so bearing clearances get larger and things begin to knock and rattle. i would try running a higher viscosity oil than is recommended it might help with the knock. but truthfully it probably needs to be rebuild or a whole new motor installed

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The rattling can be the exaust pipes hitting the car as the engine shakes. A vacume leak is a possible problem as the car has been worked on alot as the turbo is gone and the system was made to have one I hope you did'nt give much for this problem child as they go wackey and stay that way pretty easy. The check engine light is most likly on when running or it doesn'tr work one. Engine control codes need pulled and if mixture controll cdes are in the list the map senser hose needs checked the timing both ingtion and cam . The control codes could tip you off that the map senser isn't getting vacume and maybe applying an outside vacume sorce to the senser can clue you in to the other problems. ( make the computer think there is good vacume so it'll run smoth enough for you to find the leaks ) Ordinary compression cheak may find low cylinders as burnt valve and wore out engine are posible. These cars when HOTRODED can't last long and the tuner boys pull their money out after they blow em and sell the car as it's done as far as money goes.

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