this f@#& Ford

[brokesilverado]

I have a 1992 ford f-150 4x4 5.0 it seams to be losing power and the truck backfires into the air box would this be a map sensor problem this thing is gutless now it is a standard shift and it lags after you shift

[rhandwor]

Use an ohm meter and check your wires look for appx. half scale. A small gap will cause a back fire when it jumps the gap.
Do a compression test on the engine a cracked spring or bent push rod will cause a back fire.
Check the timing a jumped chain will cause these types of problems.

[brokesilverado]

opcorn:it does not back fire all the time only when it really cold out and when you run it out of gas

[brokesilverado]

any help would be appreciated

[rhandwor]

When you run it out of gas do you mean you have to walk back and get a can or do you mean something else.

[brokesilverado]

walk back for a can like in e for empty


i usually have one with me

[rhandwor]

Running empty allows you to pick up dirt in the bottom of the tank. Check the filter if its hard to blow through its probably plugged. Try cleaning the idle air control valve. I think the parts store sells fluid to clean the air flow meter.
Try unplugging it and see what happens.

[fireplow]

I once had a 92 that was gutless after going thru a rebuild on the engine I found the hamonic balancer had spun. I reajusted the timing and it came back to life. changed out the balancer and it ran great. After talking to a friend of mine about the find he said that it was uncommon to find that. He has been working on veh. for better that 30 years. He had seen it on the smaller engines but not so much on the 5.0 hope this helps

[brokesilverado]

thanks for the info

the truck seams to not have power going uphill

[brokesilverado]

it was the map sensor