Rb25 Dies Under Load. Lean Out!

[flame_this]

ok.. have an r32, rb25.

just removed microtech and replaced with standard ecu.

Problem:

dies under load, dies around 3 k depending on load. (it free revs fine)

dies when u take the next gear up.

*by saying it dies i mean it leans out so bad it doesnt run.

What i had already tried/found out.

-replaced fuel pump with a working walbro fuel pump (wired earth and power straight to battery with no difference)

-CAS timing needs to be set to full advance to get 15deg

-tried 3 different rb20/rb25 green AFM's

- converted wiring loom to run r33 s2 coil packs. runs on 6 cly fine.

- fuel is prob a bit old, but ran fine before ecu swap.

-knock sensors are not plugged in ( wired 1 to both pins quickly as it was easy to get to buy dont think it made much difference)

really dont know what to look at from here..

Edited March 5, 2012 by flame_this

[Mick_o]

What mods are done to it? So when you are saying it leans out is it pinging its head off? Is it over boosting and the factory ecu is going into limp mode??? Was it doing this before with the microtech?

[DVS JEZ]

Have u used a wideband to see if its leaning out like u say?

Is it missfiring? Is the boost dropping off, is the cat blocked?

[DVS JEZ]

I have seen the weird cas adjustment before, check the bracket that holds the cas to the head, see if its cracked. Can u borrow a cas from someone to try, is ur coolant temp sensor wired in to the stock ecu

[Moodles2]

Sounds like you need to hookup a fuel pressure gauge and see what if pressure is dropping when this happens. (will rule out fuel pump and the FPR at least)

[DVS JEZ]

Get 500kohm resistors to bypass knock sensors. Wire it in near the ecu. Is probably running on the knock maps

[flame_this]

Fixed the knock sensors. That solved the timing and lean out under load.

It still has a massive hesitation at the start of every gear though, once it works through it it's fine though.

Any ideas?

Cheers so far

[flame_this]

When I say lean out I don't have the wideband set up on this car but left like a fuel cut, which it turned out to be.

The . The next gear thing feels similar, massive stutter, no black smoke or popping, engine just feels dead.

I'll check the coolant temp sensor, that sounds plausible :-)

[flame_this]

.

Edited March 5, 2012 by flame_this

[Manuel Kasko]

How much boost are you running?

Mine does this as soon as it boosts over 15psi

I believe its the stock ECU's fuel cut

[Rolls]

Does it do it on load or even on no load?

Plug a consult cable in and check error code. Until then you are just guessing could be a million different things.

Edited March 6, 2012 by Rolls