1986 with rough idle

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Jul 6, 2010 | 10:57 AM

backdraft341

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From: spring,tx.

1986 with rough idle

i have a 1986 f150 302 fuel injected, auto trans, super cab. im having a problem with a rough idle. i have changed the plug wires and new plugs. also new distributer cap and rotor. i have cleaned the throttle body. it runns fine under acceleration. anyone have any ideas? i cant find a auto parts to check codes. they all say its to old and dont have the equipment. can i check the codes myself if so how. thanks

Jul 6, 2010 | 11:06 AM

Grubbworm

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From: Acworth, GA

Check all of your vacuum lines and caps for cracking, etc. That would be at the top of the list for me.

Jul 6, 2010 | 01:15 PM

backdraft341

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From: spring,tx.

what size vacum lines do i have? are thet all the same? i was going to buy a bunch and start changing it all. its all original.

Jul 6, 2010 | 01:26 PM

Grubbworm

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From: Acworth, GA

They vary in size and length, and yes I would change them if they are all original.

Jul 6, 2010 | 02:06 PM

backdraft341

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From: spring,tx.

anyone got a vacum diagram. mine on the truck i cant read.

Jul 6, 2010 | 02:20 PM

Festus Hagen

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From: Maine (NorCal Native)

Do them one at a time ...

-Enjoy
fh : )_~

Jul 6, 2010 | 02:44 PM

Grubbworm

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From: Acworth, GA

When I did mine, I roughly measured all of one size. Then I went to the supply house and bought a good length of that size. Then I just cut to length and replaced one at a time. I just kept doing that until they were all replaced. Oh, and I got an assortment of caps too.