My engines idling on 4 cylinders, I can pull four plug wires off with no rpm drop
I've replaced injectors,coil,plugs, wires, cap & rotor
The four not firing are 1-4-6-7, two on each side
On the distributor, that's evey other plug
Any ideas?



"91" F150 HO 302

 

Is the firing order correct?

 

I'd suspect rodent damage on the injector wiring, 1,4,5,8 are connected together and 2,3,6,7 are together.

 

That's it!

 

I'll see if I can trace them down tomorrow, I put a test light on one of the injector plugs that wasn't firing while engine running, it was lit up, not sure that means anything, got me puzzled

 

Checked all the wiring harness connections, must've been a bad connection, checked injector plugs with noid light, all good, but it was surging when idling, running real rich.any suggestion?
Need to set timing, any help on how to with this electronic ing?
Thanks for the input.

 

How to properly set the timing on a 302 or 351 - FSB Forums

 

Appreciate it