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Old 08-26-2012, 15:43   #1 (permalink)
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85 F150 , idling high , burning rich , bogging

Hey guys , a friend gave me his 85 f150 , 302 efi... been sitting for about 3 years.. i got it running but its blowing black smoke pretty bad little bit of oil too but it will idle high then idle low , and some times it will bog out if i hit the gas at all.. also i have to start it with the foot to the floor , unless its been sitting for a few days ! i replaced the idle air and put new spark plugs but with no change. any ideas ??
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Old 08-27-2012, 05:45   #2 (permalink)
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Re: 85 F150 , idling high , burning rich , bogging

Given the time it's sat and the age of the truck, I'd start by replacing all vacuum lines and plugs, including the bushing around the PCV valve and clean the carb and IAC.

I'm betting this doesn't take care of all your issues, but by getting that part of the system clean, and correct it'll get rid of a few other nuisances that may be masking more critical items.
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Old 08-27-2012, 23:06   #3 (permalink)
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Re: 85 F150 , idling high , burning rich , bogging

No telling at this point what all you will end up doing.
Your discribing a very rich condition.
Here are the ways it can happen.
1. Fuel regulator is faulty. Test fuel pressure at test port on the fuel rails.
No more thna 40 psi.
2. The MAP sensor could be faulty or the hose is bad going to the intake.
3. The tempersture sensor could be faulty.
.
If the motor runs spend your time testing/looking at these areas first, then attend to the lessor items.
Also a good idea to look at any codes than may be set.
They will be two digit codes and must be triggered from the test connector with a way to see a lamp flash the codes out.
There is a procedure but you must look it up.
Good luck.
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Old 08-28-2012, 06:09   #4 (permalink)
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Re: 85 F150 , idling high , burning rich , bogging

The best way to find out the problem is to get the error code. It could be throttle position sensor error. If so, it needs to be replaced.
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Old 08-28-2012, 08:16   #5 (permalink)
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Re: 85 F150 , idling high , burning rich , bogging

Fuel Injection Technical Library How To Run a Self-Test
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