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Re: i have 1981 straight 6 engine
There are adjuster screws on each side of the carburattor one is fuel flow one is for air flow. turn them both ttil they are screwed all the way in and then on each one give it almost a full turn.you can use a flathead to do this and it takes about 10 minutes to do.
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If exhaust is rich, you may have excessive fuel getting dumped into cylinder(s). A sicking or leaking fuel injector can cause this. How many miles are on the engine? Improperly seating valves can cause this also. Or if timing is incorrect.
Leaking fuel pressure regulator , or leaking injector's ,depends on injection system . ! it's only running rich on right bank. whatever that means . Your vehicle is a v - 6 has two banks . right side of the engine an left side of the engine . Bank 1 is where #1 spark plug is . bank 1 is odd numbers 1-3-5 Bank 2 is even firing #'s 2-4-6 . What fuel injection system does it have ?
Your best bet mite be to take your vehicle to a qualified repair shop.
The F100 ended in 1983, so there is some confusion on your 1987 Ford F100. The F150 started in 1983 and was available in 1987, but not the F100. You have this listed under the 1981 Ford F100 category. The 300 CID = 4.9L In-Line (Straight) 6-Cylinder. In order to best answer your question I have included both the 1981 F100 4.9L and 1987 F150 4.9L below. The only difference is with the Distributor Cap Configuration and Connections.
With this you MUST have the ENGINE WIRING HARNESS for the Straight 6 as the Components such as TEMP Sensors, Distribitor, and other Electrical Items ARE DIFFERENT. Also ECM will have to Come With Striaght 6 as it is Calibrated for this Configeration ONLY.
I have Always ADVISED AGAINST this type of Engine SWAP Due to All I have Discribed here , UNLESS You Just Dont Mind Making ALL the Adjustments and MODIFICATIONS Needed for this Change Over.
Hope this Helps As your "DISCRIPTION" is Pretty Brief.
Have you done an engine vacuum leak test with carby cleaner especially around injector seals.A leak will throw a lean signal to oxy sensor there by telling the computer it needs more fuel.Cant think of anything other than what you have already done.