Help! 97 down. fuel pressure all over the place

[97pig]

Hey to everybody. been reading on website a while. first time logging on. anyway, my 97 is ill! truck will start, but runs real rough. check engine light comes on and pops a boost range code and cam position intermittent signal code. fuel pressure is all over the place. then all of the sudden it levels out and check engine light goes out. any ideas?

 

[95_stroker]

Sounds like you are sucking air into the fuel.

 

[97pig]

Same thought

I figured the same thing. is this common? if so, where does it generally do it from?

 

[97pig]

think thats it. pretty sure i found the source. thanks. keep u posted.

 

[97pig]

well i thought i had it. found a bad clamp at the inlet of the fuel pump. ran good for about ten minutes. then it started running bad again. won't clear up. pulling 2 codes. p0603(KAM KEEP ALIVE MEMORY)and p0344(cam positon ckt intermittent) any input appreciated

 

[roosterdiesel]

...and p0344(cam positon ckt intermittent)

Ummmm.....have you changed the CPS(cam position sensor)?

 

[97pig]

Changed cam sensor

yeah I changed out the cam sensor. I've had the truck for 2 years now. Since I've had it I've occasionally plugged in my scan tool to check for codes or codes pending. That code has come up most of the time. Even when the truck seemed to run ok. Except since I've had it there's been a slight hesitation under no load at about 2500 rpm.

 

[97pig]

melted wires

just found some melted wires that go to a coil on a solenoid that screws into the hpop. repaired wires and still no luck.

 

[roosterdiesel]

Check wiring to the CPS.


May want to pull the VC and check the under valve cover harnesses.

 

[97pig]

thanks man. checking that one now.

checking those now. was hoping I wouldn't have to pull valve covers, but looks like I'm going to have to. wires to cmp all appear fine