weird cps problem - Diesel Forum

aquaman_atl · 02-19-2007, 08:26 PM

hi there, i'm new to this forums since i just got this truck, 95 f-350 7.3 TDI. here is my problem.
when i try to start it, if it is cold it will start with no problems and work and drive wonderfully, after 3-4 minutes it seems like the injection is cutting off, it starts to stall until it shuts off and wont start again until 1 hour or so, now the weird stuff.
after it shuts off, the tachometer starts to jump randomly and i hear a clicking sound coming from the valve cover area, like if the injectors were firing with the engine off. this happens until i turn the key off.
all the regular stuff has been checked, WTS light comes on, i have fuel (lots of it), oil pressure is coming out of the HPOP, fuses are ok.
all this leads me to think of a bad CPS (or about to go bad), since that random jump in the RPMs after i shut it off can ONLY be caused by the CPS.
thanks in advance and sorry for the long post

**action4478** · 02-19-2007, 08:33 PM

[ QUOTE ]
hi there, i'm new to this forums since i just got this truck, 95 f-350 7.3 TDI. here is my problem.
when i try to start it, if it is cold it will start with no problems and work and drive wonderfully, after 3-4 minutes it seems like the injection is cutting off, it starts to stall until it shuts off and wont start again until 1 hour or so, now the weird stuff.
after it shuts off, the tachometer starts to jump randomly and i hear a clicking sound coming from the valve cover area, like if the injectors were firing with the engine off. this happens until i turn the key off.
all the regular stuff has been checked, WTS light comes on, i have fuel (lots of it), oil pressure is coming out of the HPOP, fuses are ok.
all this leads me to think of a bad CPS (or about to go bad), since that random jump in the RPMs after i shut it off can ONLY be caused by the CPS.
thanks in advance and sorry for the long post

[/ QUOTE ]Welcome ...This is a new one on me,, Where Do you live , how warm is it there,how old is the oil,&.....Is it full...Just a few thoughts to get you started...

aquaman_atl · 02-19-2007, 09:17 PM

i live in jonesboro, ga. about 20 min south of ATL. it is cold. oil is full and in good shape, HPOP is full too

STurbo90 · 02-19-2007, 09:19 PM

or a bad pcm????

aquaman_atl · 02-19-2007, 10:23 PM

i'm gonna try a cps that one of my friends has in his truck tomorrow. i'll let you guys know.
what beats me is the rpm jumpinkg after the engine dies

aquaman_atl · 02-20-2007, 08:49 PM

ok guys, i kinda fixed it today, i pulled the cps yesterday, cleaned it up and put it back in. after starting, it wanted to stall but i immediately disconnected the icp and it started running good. CEL is on but it runs good, i'll keep you guys up to date with this

aquaman_atl · 03-02-2007, 10:07 PM

Final veredict. It WAS the CPS, i finally ordered one from ROCKAUTO.COM for 130 bucks. it's working wonderfully now. Thanks for your help.

**action4478** · 03-02-2007, 10:24 PM

[ QUOTE ]
ok guys, i kinda fixed it today, i pulled the cps yesterday, cleaned it up and put it back in. after starting, it wanted to stall but i immediately disconnected the icp and it started running good. CEL is on but it runs good, i'll keep you guys up to date with this

[/ QUOTE ]Glad to hear all is well.. Usually the ICP is tied to the IPR...Let us Know what happens...