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Engine is burning rich
10-20-2015, 09:26 PM
Post: #1
Engine is burning rich
I am new to the forums... Hoping I can get some advice here.

My brother gave me his old 86 Ford F-150 farm truck and I am using it to drive to and from work. It has the 5.0 liter V-8 (I am assuming that it is the 302ci) with fuel injection and what I know about fuel injection would fit into a thimble. It is burning really rich. Is there any advice you can give me for how to thin out the mixture? If it was carbureted I could do it... it would just be a matter of finding the correct set screw and adjust it, but I don't even know if that is possible with fuel injection.

Anyway. looking forward to any replies and or advice you may have.


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10-21-2015, 05:31 AM
Post: #2
RE: Engine is burning rich
If the Check Engine Light is on the codes may hold some clues to where to look. Since your mixture would be set by the computer you need to determine why it is calibrating the mixture incorrectly. Some common things can be vacuum leaks, a temperature sensor telling the computer that it's really cold out, MAP sensor, O2 sensor, and dirty air filter are some suspects. Knowing the codes could save a lot of wasted time and money. Post the codes here and we may be able to offer some better advice.

Thanks for using the forum,

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10-21-2015, 10:21 AM
Post: #3
RE: Engine is burning rich
Garner gave you a nice list to check, which is great advice, but I'll throw in a little logic. Start on the easy end and do a visual inspection of the vac hoses and air filter. Seeing as you mentiond it was a farm truck, and since he gave it to you he probably wasn't using it much, which leads me to those as the obvious items. Mice (and other small critters) like to chew on things and build their nests near by, especially in a vehicle that doesn't move too much. I can't tell you how many times I have seen an air filter housing filled to the top with the winter's food supply and blocking off the proper air flow. If those items are ok then get someone at the parts store or garage to do a scan for codes. A parts store will usually do a scan for no charge in the hope you will buy the necessary parts from them.
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