Truck (2002 4.7L V8) was running bad, almost felt like it was missing, one day the truck died and after a few tries I got it to start but it ran rough. Check engine light came on and had codes 1391 & 340. So I got a CPS and a set of plugs. Put the sensor in and then replaced all plugs one at a time. Now truck won't start at all & CEL is blinking. It turns and tries to start just won't.

It has no codes now just the CEL blinking, any advice? I am going to put old plugs back in and see if maybe I got a bad set.

 

put the old CPS back in and see what happens. If it cranks then you got a faulty cps.

 

X2,

It's much more likely to be a bad CPS than 8 bad plugs.

 

did you gap the plugs first? .040 i do believe

 

Yea everything gapped right and old plugs didn't help, then it was just too cold today and looked like it was going to snow so I called it a day. I'll try the old sensor tomorrow and see if that will get it to start