m52 power loss at full throttle

[e-dirtym52]

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

[Plynch2]

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

[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]

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]

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]

Anyone replace the MAF ?

[e-dirtym52]

Do you throw any codes?

[chuck90m3]

Starting to think maybe it's the tune? What chip should I get for my obd1 m52? I have the obd1 performance chip from trm. Here's the set up:
TRM OBD-I Performance Chips
(Displacement: 2.8 L
Injector: 21.5 lb/hr
Intake Manifold: M50/S50
HFM: Stock OBD-I
Cams: Stock (M50/M52)
Flywheel: Stock
Fuel: 91 Octane)

Does anyone else have this set up? Did I sign up for anything wrong? I called trm in the past and talked to them but they didn't really give me any insight on anything.
What tune do you guys recommend?

I have the same chip and the same problem. Ill keep you updated on what I find and if it is the programming.

[LowR3V'in]

30 to 40kpa is real good.

[e-dirtym52]

What about my vacuum reading? What should they typically be reading?

[squidmaster]

fuel pressure does change depending on what you're doing. Best way to test pressure is to just jump the pump while the car is off, and take a reading. That will be the max pressure (should be 3.5bar for the m50/2 if I'm not mistaken)

I really don't think the tune would make it fall completely flat on it's arse, it would likely just bog slightly or stutter at points if it was tuned for different injectors/setup.

[e-dirtym52]

What should my fuel pressure and my vacuum pressure be at? I'm going to borrow a fuel pressure tester Monday and a vacuum tester as well. I remember testing fuel pressure a while ago and it read good but we only tested it while idling and holding the Revs. Will it change from holding revs to actually driving and having it try to pull the car?

[e-dirtym52]

Starting to think maybe it's the tune? What chip should I get for my obd1 m52? I have the obd1 performance chip from trm. Here's the set up:
TRM OBD-I Performance Chips
(Displacement: 2.8 L
Injector: 21.5 lb/hr
Intake Manifold: M50/S50
HFM: Stock OBD-I
Cams: Stock (M50/M52)
Flywheel: Stock
Fuel: 91 Octane)

Does anyone else have this set up? Did I sign up for anything wrong? I called trm in the past and talked to them but they didn't really give me any insight on anything.
What tune do you guys recommend?

[e-dirtym52]

After putting in the crank and cam sensor I want to say it drove better but still has the same issue. It popped out a cam sensor code and a lambda control code but I replaced the cam and o2 sensor so I'm guessing it's leaning out maybe under load. I've replaced the pump and filter already so I don't think it's clogged at all. I don't think it has any vacuum leaks. And if it did, not anything that would cause something this bad.

[E30NJ]

my dads car does the same. did you find the problem?