m52 power loss at full throttle

[e-dirtym52]

Sorry my tps is airtex. Crank is FACET. and cam is AIP electronics. Didn't get OEM stuff because I figured if I could get it to run fine for a while and it goes out again I'll spend the money. But since nothing changed whatsoever then I don't believe the issue is around there.

As for grounds I ran a brand new ground from where the old one was. I'll get another ground wire and ground it straight from the block. I think the one on there now is coming from the motor mount arm

[Plynch2]

Ok. Replaced my cranck shaft positon sensor with a non bosch one. The car ran great for about 10 miles and then the problem was back. So I'm going to try a bosch cps next.

[RobertK]

I can't remember. It wasn't BMW I think it was like airtex or something like that

Airtex = Chinese Shit.. Get OEM Bosch. It may not be what's causing your immediate issue but going oem will prevent future issues.

As for grounds it never hurts to run an extra ground from the body directly to the block. Check the original ground for corrosion, poor contact, etc.

Also, check your gas tank and fuel filter. Make sure its not full of sediment / rust. I've seen sediment cause some weird issues with fuel delivery where sitting idle in the driveway is fine but out on the road funky things happen when things get sloshed around..

[e-dirtym52]

I can't remember. It wasn't BMW I think it was like airtex or something like that

[Plynch2]

What brand position sensors did you get?

[e-dirtym52]

Yea I've replaced the harness with an e34 harness I got from a working m50 swap my friend had. So it's not in the harness itself. I was thinking of adding an extra ground from the engine. Any locations that you guys recommend putting one at?

[RobertK]

Any chance you've tried replacing the wire harness?

From everything I've read it almost sounds like an electrical shit demon or possible grounding issue.

[e-dirtym52]

Vacuum read at around 40 kpa (31-32 cmhg) going to test voltage while driving on the pump tonight when I get a passenger

[e-dirtym52]

I jumped the relay and the pump maxed out at a little over 60 psi so it pumps out plenty. Got too late to actually start it and test the voltage so that's first on my list to do tomorrow along with testing vacuum.

[Plynch2]

Nope. always deffernt points

[squidmaster]

what about injection and ignition though?
Is it always at the same RPM points?

[Plynch2]

I have already tr
ied hot wired my fule pump to the battery.

[e-dirtym52]

Yea I can try to get to that tonight. I'm getting a fuel pressure gauge and a vacuum tester tonight so I'll test the fuel pump voltage as well while I'm in there.

[squidmaster]

It's times like this that makes you wish the Ostrich could datalog!
I'm working on a plugin and piggyback circuit that will allow you to datalog with TPRT5 though, so keep an eye out for that!

Is there any way that either of you could hook a voltmeter to the fuel pump wires to monitor the power going to it while driving? Then you could try the ignition system, and then injection system. That way you can find out exactly what is falling flat.

[Plynch2]

It cuts 100%. It might also cut spark but idk.

http://youtu.be/3Yb5HWRpcD8

That's what happens. The fule cuts in and out then the car pulls to redline