shadow993

So.. ECU fried, and replaced with another.. same model. The car has a new AFM and hard wired fuel pump.

The car idles and starts fine. As soon as I rev it, it starts backfiring and struggles. You can gingerly drive it with a steady slowly increasing throttle to 50mph.

Any aggressive throttle thing go wrong.

Thoughts?

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iTrader: (5)

Confirmed you're running on both rotors? Checked for vacuum leaks?

got_boost

iTrader: (16)

could be a few things,... injectors clogged with debris, fouled spark plugs , fuel filter clogged , bad batch of fuel , vacuum leak ...
do you have A/F gauge ? does the mixture gets leaner ?

shop diagnostic > forum diagnostic

shadow993

Thanks. I'll check a few of those. I can install an A/f gauge.. great idea

wai

it happened to my turboII before , I had A/F ratio gauge , it will show "lean" (18-20:1) when I step on the gas,
coils ,TPS was working fine , I can't find the problem before I sold my car....
my car only happens when driving in rainy day , I think it was something about the ground wires , you can check the fuel pump resistor relay if you had one.

shadow993

Great idea... I've read ground the injectors wires at the ecu . Also, the 2 stage fuel pump pressure.. I'm putting a gauge on it.

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iTrader: (5)

Pull your plugs and report back with the findings. One wet, one dry? Still betting you're running on one rotor.

shadow993

They look fine, and compression checks out.

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iTrader: (5)

When I say you're probably running on one rotor, that doesn't necessarily mean no compression. may be missing fuel or spark which is why I asked you to pull the plugs. You should take some pics of them and post them.