m52 power loss at full throttle

[chuck90m3]

Anyone replace the MAF ?

Yes I did, the air meter and the TPS. I'm going to throw a set of ignition coils at it today to see if it helps.

[Plynch2]

At this point I have replaced the crank position sensor and the cam position sensor, TPS, knock sensors where new with the swap.

And my problem is the car cuts fuel as I can see on my afr gauge, twice at any rpm any gear when I go wot.

[chuck90m3]

At this point I have replaced the crank position sensor and the cam position sensor, TPS, knock sensors where new with the swap.

And my problem is the car cuts fuel as I can see on my afr gauge, twice at any rpm any gear when I go wot.

What software are you running

[Plynch2]

Ostrich 2.0 tuner pro. I have tryed multiple tunes from stock s50 to a perfomance tune. Still the same problem.

[e-dirtym52]

Yea I've replaced and cleaned the maf. How bad does your fuel cut out at wot?

[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

[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.

[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.

[Plynch2]

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

[squidmaster]

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

[Plynch2]

Nope. always deffernt points

[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.

[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

[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]

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?