I have the zzp longblock and fired it up.it runs, barely, with p0087 at idle. Any ideas?

 

Did you prime the fuel system thoroughly past the HPFP into the rail? DI systems can be a bit like diesels in that if they aren't primed properly you will never build enough fuel pressure in the rail and/or injectors for the engine to run properly if at all. Also, don't forget that these are not return style fuel systems, so just keying the ignition on and off multiples times is not a sufficient enough fuel prime for a dry fuel system.

 

Nope. How do you prime it properly? Even more so now that I have run it not primed...

 

well have you gotten a tune? changing the hpfp and cams definitely need to be dialed in

 

You do have hptuners right?

 

There is a service port on the rail that you can depress with a small flat head screw driver with a rag over the port to bleed off any air in the system while cranking the motor.

As others have also mentioned, you will obviously need to tune the vehicle as well, however this will not resolve the low fuel rail pressure issue. Your issue at the moment sounds mechanical and not tuning based

 

Subd

 

Possibly the lpfp has gone bad? Can the hpfp pull fuel through the lpfp nd still run?

 

Trifecta, so I can't actually to anything tuning wise until monday

 

So, a little more history.

That battery was disconnected for about 2 months. Now it idles nice and smooth but the code is still there. A reset just brings the code right back. Bringing it up through the revs is a bit bumpy with a few stumbles and what not. I sent vince some logs for him to review.

If this is mechanical its either
a. the low pressure pump
b. the high pressure pump
c. the cam driving the high pressure pump.

Is there anything else I am missing?

 

Good to hear you got it running smooth for the most part now. Did bleeding the fuel system do the trick for you?

If there was an issue with your in-tank pump you would have most likely seen some sort of signs even on the stock cam lobe profile for the hpft and the car may very well not have even ran to begin with. Even though (while driving), there will now be a higher demand on the in-tank pump with the larger hpfp cam lobe, you are not actually demanding much more from either of the pumps at idle without actually applying some sort of a load on the engine and fuel system (aka driving the vehicle.. particularly at WOT)

Now that the car is at least running smooth, tuning is going to be pretty key at this point. I am honestly a little surprised that you are still shooting a p0087 dtc though. Granted I don't have any experience with the zzp cams, however I would expect to see just the opposite of a low rail pressure issue. I would have to assume that the cam profile has a greater lift than stock, so in that case the pump should be creating a higher rail pressure even at idle. It stinks you don't have access to some sort of scan tool or hptuner to at the very least view what your fuel rail pressure looks like at this point.

 

I know man. Its killing me to not be able to work on the car till Monday. But vince has the logs, I wll be calling zzp also.to see what there other customers have done.

 

Maybe I should mention, I got this engine because cyl 2 exploded on my old engine. Actually took out the fuel injector too... so maybe a fuel pump went out suddenly and leaned out?

 

Wait till vince looks at the logs, your answer might be in there.

 

He looked at them today. No luck.' Looks mechanical.

 

Did he mention what the rail pressure was at idle?

 

He said his software isn't setup to record rail pressure in a Data log...

 

More than likely your tuner, actually. JM2C.

 

How the hell is he tuning people on E-85 then? You must watch the desired vs actual rail pressure to make sure the car is not running out of fuel.

 

then how the hell would he know if nothing is wrong?

 

yikes.. all these great software based developements he's had for the community and he's never set a PID in his logging software for something as simple as fuel rail pressure? I'm a bit surprised by that

 

Doesn't surprise me at all.

You guys seem to think the guy is some kind of tuning god or something. He was a manager at Microsoft. He "tinkered" with cars. But yet you all trust your motors health and well being to him. Amazing.

Sorry Jeb, but running an engine with mods like you've done without logging constantly with HPTuners and having somebody that knows what they're doing looking at those logs is retarded. How much money do you have in this new motor? Whatever it is it's a helluva lot to risk. You blew the last motor because of bad tuning and modifying, it looks like you're on the same path with this one. This is kinda like having a blind surgeon put a pacemaker in you, and him saying "Oh forget about checking it with those silly EKG's, we won't need to see if it's actually working or if we have your heart rate at 200bpm".

 

That's a crock. He showed otherwise in the "e85 breakthrough" thread.

+1 to what J said.

 

In order to show an example of fuel rail pressure being raised without actually showing a screenshot of his own proprietary software he logged via ScanXL to show his findings. So that isn't a valid example unfortunately

 

Please refer to post #18.