NEED HELP: 86 F150 EFI problem - - Home of Canadian Ford Truck Enthusiasts
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post #1 of 3 (permalink) Old 11-26-2010, 03:30 PM Thread Starter
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Location: Calgary Canada
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86 F150 EFI problem

My father in law has an 86 F150 4X4 with 302 CID EFI and it bogs down an run rough intemitantly when the weather is warm ( 20 C +). It does not stall and he has removed the fuel cap, replaced high pressure fuel pump and replaced an various sensor MAP, throttle position etc. The only sensor not replaced is the O2 sensor ( he disconnected it and it make so difference on the performance). He had it checked for and OBII fault codes (none) Any advice why it runs poorly on occasion ?

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post #2 of 3 (permalink) Old 11-26-2010, 03:36 PM
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what's his TPS voltage set at? Second thing is that it's an OBDI truck not OBDII

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post #3 of 3 (permalink) Old 01-25-2011, 09:31 AM Thread Starter
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Just to update thiis issue - my father inlaw removed the tank and found that the internal rubber fuel line inside the tanks was rotted thru and was unable to deliver consistant fuel pressure to the external high pressure pump. Also there was alot of corrosion and fuel by products in the tank (rust and varnish). My father inlaw noticed that this problem was more often when he was half tank or less of fuel or if he was on rough roads. The high pressure pump would also howl occasionally ( due to lack of consistant fuel pressure ) . Early on in his quest to find this problem he had a reputatble repair shop go thru the truck and check diagnositc codes and fuel delivery but according to the tech - all things checked out as normal or acceptable. I think the lesson learned is that older vehicles should have the tank removed every 10 to 15 years to clean and repair the internals especially if the truck has been parked for an extended period of time.

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