Going nuts!!!

[mrtosh]

Did U get it changed? If so, was that the problem?

I haven't changed the CPS yet. I did change the thermostat, and now it doesn't fluctuate in temp anymore. I'm wondering if it's losing fuel pressure, and that's why it's hard to start after sitting for about a 1/2 hour. But that wouldn't exactly explain why it starts right away when cold. Maybe cause the fuel is running richer when cold, dk... Might try a BMW check valve to see if that helps at all... The only reason I don't quite think it's ignition related is because when it does fire up when warm, it kind of stutters like it's not getting enough fuel... We'll see what happens...

 

[Rust Heap]

fyi, the cps does tell the computer when to fire the injectors

 

[mrtosh]

i did check pressure at the rail just by pushing in the schrader valve after it had sit for about a 1/2 hour and nothing came out. Correct me if I'm wrong, but even w/10psi there should be a good size squirt that would come out.... And it's supposed to be holding around 19 after a 1/2 hour??

 

[kloker]

I had a similar problem with my Honda Civic. Turned out to be some ignition-related relay under the dash. $25 part, $15 labor to diagnose and replace. I never would have figured it out, just got lucky that my favorite local Honda mechanic is an ace and knew what it was as soon as I described it to him.

 

[mrtosh]

Soo, I put in a BMW check valve and yet no results. Still takes a long time to start when warm. I'm thinking it's either the Fuel Pressure Regulator or the CPS. The only reason I'm not automatically assuming it's the CPS is because once started it acts like it's starving for fuel, then kicks right up to where it should be. If you were to shut it off, then get back to it within 10 mins, it fires right up. You would think that if the CPS was getting balky when warm, it would take the same amount of time to fire it up the second time?

 

[MDSIDMAN]

There is a Chrysler service bulletin pertaining to hard start issues that involves the fuel sending unit supply hose. You can find it on the internet. The bulletin # is 18-12-92. That would be where I would start. CPS works or doesn't... No long crank issue there.

 

[mrtosh]

^^^^ I've heard from quite a few members on this forum, that a CPS that's going bad will act tempermental sometimes, instead of just going out....

 

[MDSIDMAN]

I work for a Jeep dealership and have never had one cause a hard start. Only a complete no start. Long crank almost always = fuel taking a long time to get there.

 

[mrtosh]

I work for a Jeep dealership and have never had one cause a hard start. Only a complete no start. Long crank almost always = fuel taking a long time to get there.

Not saying I don't believe you, but if you read some of Parkuph's post's in this thread he lists that that was exactly what he experienced before his CPS took a shit..

 

[Rust Heap]

I work for a Jeep dealership and have never had one cause a hard start. Only a complete no start. Long crank almost always = fuel taking a long time to get there.

CPS cured my hard starting but I'm lucky like that :wave1:

Good luck.

 

[mrtosh]

Damnit, looks like i need to bite the bullet and get a CPS.... Is there really a diffence between a Manual and an automatic tranny CPS??

 

[needsrepair]

It has to have fuel pressure and Volume. Its never going to run if it hasnt got good enough pressure and enough volume. Some auto parts places loan tools. Get a pressure gauge. Search for your vehicles pressure specs. If the pressure is close then do a volume test. Its on here also. I think it should fill a 1 litre bottle in 1 minute.

 

[needsrepair]

http://www.naxja.org/forum/showthread.php?t=101119

 

[mrtosh]

FIXED!!! I changed the Fuel pressure Regulator this weekend and my problem is gone. No more long crank when warm.. The old FPR had a bunch of black crap in the screen. Guessing the diaphram was falling apart. Thanks for all the help guys... This forum rocks