Best diagnostic ap to use with wifi obd reader Hard start...

flash7210 · **Posted:** Wed Jul 22, 2015 10:22 pm

If the rail pressure solenoid is not closing, there will not be enough rail pressure to start the engine.
Three different solenoids have been tested, correct?
It's unlikely that all three are bad.
A fault in the rail pressure solenoid wiring could cause this but would also throw a code.
If no code, then something is commanding the solenoid to be fully open.
A rail pressure sensor problem could cause this.
Disconnecting the rail pressure sensor will command the solenoid to be fully closed.
If it will not start with the rail pressure sensor disconnected, the problem is either with the rail pressure solenoid or CP3.

This is where a rail pressure gauge would be really handy.

Iso_Bueller · **Joined:** Sat Jan 17, 2015 12:51 pm **Posts:** 20

I checked the injectors with the best method I could come up with. I hooked up the shirt return line to a syringe bottom and cranked for 20 seconds on each injector. It was very difficult to measure a difference.
I did a bleed at the filter head with the lift pump running and it seemed like I got all the air out and had pressure on the prime bulb. And it started and ran for the longest time by far 7-10 seconds. I thought I for sure had it. While running I tried to give it a little more gas pedal and it died and would never start again tonight. Very frustrating!!
I do not understand why the fpv is dumping fuel. It may or may not be dumping for the first second of cranking but it definitely is after 2 seconds.
This fpv is my second used one to test. They both came used on a rail and had no signs of ever being removed and the previous owners said they never were. When o first tested the current newest fpv on Sunday it held pressure for the longest time something like five seconds, but I thought maybe that was do to the lack of bleeding after installing the new rail.
1-My question is can you ruin these valves with overpressure?
I tried running it with the fpv unplugged and the mprop unplugged independently. No difference.. My only thought now is to try this used cp3. I'm almost done with this thing.

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Iso_Bueller · **Joined:** Sat Jan 17, 2015 12:51 pm **Posts:** 20

Ok sounds like I will need to order a Gauge. Many thx to you two for all the help. I'm going on 3 and a half months down. Though I took a long break while we had extreme hot weather. Thx!

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Iso_Bueller · **Joined:** Sat Jan 17, 2015 12:51 pm **Posts:** 20

What autometer gauge did you get flash? Thx

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flash7210 · **Posted:** Thu Jul 23, 2015 10:45 am

Sorry, don't have the part number available right now.
I just searched Amazon for a fuel rail pressure gauge.
Just make sure that the gauge you order is 0-30,000 psi.
I saw a glowshift gauge listed for $100.

quickcut · **Joined:** Tue Jan 27, 2015 12:57 am **Posts:** 15

so that is a digital input only gauge?

Have you ever heard of anyone ruining the fuel pressure solenoid?
I'm wondering if I need to buy a new one because this thing is not closing at start, but either was the one before or before.
Anybody know where a great deal can be had on these???
thanks guy's

:banghead:

flash7210 · **Posted:** Thu Jul 23, 2015 4:03 pm

All the new rail pressure solenoids seem to be around $300.
Might want to try OregonFuelInjection to see what they have. I got my MPROP and rail pressure sensor from them.

At this point, it possible that the problem has nothing to do with rail pressure.
If the engine is just cranking and not starting the problem could be ASD fuse, ASD relay, SKIM module, camshaft sensor, or crankshaft sensor.
It could be a intermittent electrical problem that may not throw a code.
In my case, it was the rail pressure sensor harness connector. But I was getting a code for the rail pressure sensor at the time.

quickcut · **Joined:** Tue Jan 27, 2015 12:57 am **Posts:** 15

Yeah, I'm not excited about spending another $400 and possibly ruining the FPS, yet it looks like it is the likly to happen. Thx for the help Flash

quickcut · **Joined:** Tue Jan 27, 2015 12:57 am **Posts:** 15

Is there suppose to have 10volts on thefps at run key position? I have 10v

deeprecon1 · **Posted:** Wed Jul 29, 2015 10:23 pm

post deleted ... by me lol

Best diagnostic ap to use with wifi obd reader Hard start...

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