During the winter I started having hard starts and romps when first starting my truck . I did a continuity test on the 9 pin connectors on the valve covers . Found one on the passenger side (cyl#5) with no continuity .

I also have a cheapo battery tester that plugs into the cigarette lighter which tells me when the GP's are done energizing before I start the truck . Occasionally , the GP's would not energize when I turned the key on so I would jump the GPR to get it fired up . So I bought a Stancor 586-902 from Mouser Electronics to replace the intermittent GPR . I thought I was going to have to replace a GP also so I bought 4 new ones from the stealership to replace them all when I was under the valve covers .

This past weekend , I took the passenger side valve cover off to find the connector partially unplugged . I pushed it back on then did a continuity test again and had that problem fixed , so I didn't replace any of the GP's . I also did the 25cent mod on that side . Then I torqued the injector hold downs and rocker retaining bolts . All the injector hold downs were loose . I then went to the drivers side and did the same procedure with the 25cent mod too . I put it all together and the truck sounds quieter to me now .

BUT.... the intermitent GPR energizing problem is still happening .

I'm stumped as to what to check in the way of wiring .

Do you guys think I might have a bad ground problem happening ??

Sometimes when the GPR doesn't energize and I hit the starter , The GPR will then energize .

Thank-you for your thoughts !

 

It sounds like you need a GPR LED. The control for the GPR is direct from the PCM, so you might have a bad Air Intak Temperature sensor, a bad ground somewhere, a loose terminal, a bad connection from the PCM plug, or something similar.

Romps are most typical on old injectors with dead dinos. 5-40 oil really helps to prevent romps in cold weather.

 

Thank-you Tugly for the wiring schematics . I have that one saved in my Ford folder for reference .


Crap , I hate wiring problems . Lots of places for problems to arise from .

I guess I will start by making sure I have good grounds and then go from there .

The hardest part of this will be because it is an intermittent problem . And mostly it happens when I got to go to work which makes it hard to do something to it because I have to be somewhere .