m52 power loss at full throttle

[e-dirtym52]

put in the crank sensor but they sent me the wrong cam so just waiting for yet another part to show up at my front door.

[Plynch2]

Any updates?

[e-dirtym52]

haha yea it will basically be a brand new engine that won't run right

[squidmaster]

well if those don't work at least it's good preventative maintenance!

[e-dirtym52]

yea i've tried the whole change the ecu and chip stuff tons of times. i don't have a gauge i can borrow but i'll give the multimeter a shot. but even with the o2 unplugged and not even reading it won't change anything and from what i've heard from my friend he didn't have any troubles with no o2 in his e30 s52 obd1. and he's got a trm tune as well. my crank sensor came in today and my cam sensor comes in tomorrow so after i get those puppies in i'll take down the multimeter readings of the o2

[squidmaster]

Because if it was just a tune for the stock injectors, it would cause the extremely rich running and possible power loss. Was just an idea.
What about that o2 gauge? Even a multimeter would work, just jam it between the o2 feedback wire (green wire I think on the ECU, please double check I am probably wrong) and a ground and read the voltage. That will give you an idea of how stoichiometric mixture

[e-dirtym52]

i called trm when i first got my build done and talked to them and they said that it isn't the chip. it's tuned correctly for everything. when i put in the stock chip it still does it too.

[squidmaster]

Nah the plugs are fine.
It's really odd. It really sounds like TPS to me but you've already changed that.
If it's running super rich though... have you tried out the stock chip? You're sure the TRM is for 21#? Do you have a narrowband AFR gauge you could hook up, or a wideband o2 you could borrow?

[e-dirtym52]

NGK vpower until I figure out what's wrong and then upgrade to something better

[squidmaster]

what plugs are you running?

[e-dirtym52]

My spark plugs still smell like gas if I take them out after running the car. I've tested the fuel pressure at idle and under load but I haven't while driving but it was good. And I've tested the vacuum and also sprayed carb cleaner around all vacuum lines and all around the intake and there aren't any leaks at all.

[ParsedOut]

It also runs super rich. Backfires like crazy when I let off the gas if that says anything

Are you sure it's rich and not lean? Contrary to common sense, backfires are usually an indication of a lean condition.

Have you done a smoke test or a VERY thorough inspection for vacuum leaks? Checked your fuel pressure during the "fall on the face" moment? That's where my money is.

[e-dirtym52]

I have a new fuel filter and it gets plenty of fuel because it runs really rich. Why do you think its the chip? I have a trm chip programmed for the correct injectors and obd1 wiring harness. Who would you recommend getting a chip through?

[JohnyEndo]

It sounds like a lack of fuel issue to me.. Maybe a clogged/old filter.

[m3boost]

It's the chip