I have a 1993 f150 4.9l 5 speed and every time I put it in neutral to stop it dies. No spitting or sputtering just dead. I've replaced the entire fuel system from the tanks to the injectors. New MAP sensor new plugs wires cap and rotor. No idea what to check next.

 

How about the codes?

 

I dont have any way to scan the codes. The CEL comes on sometimes and other times it stays off but the problem is there all the time.

 

I finally got most of the codes taken care of. New TPS, fuel pump relay, o2 sensor. Now I only have 2 codes I'm worried about. 556 and 542. Both have to do with the fuel pump circuit. I am curious where to start the search for the bad ground.

 

What are those codes, KOEO, CM or KOER?
If they are CM codes try clearing the codes and see if they return after driving.

 

They are KOEO codes. After I replaced the parts in my last reply I removed all of the CM codes and now those are the only 2 remaining other than the neutral safety switch and egr that I blocked off.

 

You might check the Fuel pumps ground at the left radiator support G100.
Attachment 277901

And the main body ground at the right fender G101.
Attachment 277906


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Thank you very much. I will check those now.