97 WRX Wagon in NZ running problems
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97 WRX Wagon in NZ running problems
Good Morning Scooby fans,
Wonder if someone can help me. These are the mods carried out so far:
Standard EJ20 Turbo from a Japanese import WRX Wagon.
TD05 Upgrade
STI RA ECU
Yellow injectors
STI MAF
Decat downpipe.
Boosting at 14psi no surges.
Since the upgrades the car was running sweet until one day I had some misfiring issues at 100kmh. As you put power on it would have a major hesitation then pull away. It also started idling 1500rpm at random times. So since then I have replaced the following with used parts. Maybe not wise when looking for a problem.
TPS was swapped out.
IACV Swapped and cleaned.
O2 sensor on downpipes changed (this stopped the hesitation)
MAF swapped out and changed.
ECU Swapped from an STI to and STI RA.
Since then I have had no more hesitations but now the car is idling up to 1100 at times and surging. It sometimes hesitates is hot then parked up for 30 mins and driven away it may do a few kangaroo jumps then all good again. It also feels like it has a dead band at about 2500rpm where it feels like it wants to hesitate but doesn't. All a bit odd really.
Any suggestions would be greatly appreciated guys.
Wonder if someone can help me. These are the mods carried out so far:
Standard EJ20 Turbo from a Japanese import WRX Wagon.
TD05 Upgrade
STI RA ECU
Yellow injectors
STI MAF
Decat downpipe.
Boosting at 14psi no surges.
Since the upgrades the car was running sweet until one day I had some misfiring issues at 100kmh. As you put power on it would have a major hesitation then pull away. It also started idling 1500rpm at random times. So since then I have replaced the following with used parts. Maybe not wise when looking for a problem.
TPS was swapped out.
IACV Swapped and cleaned.
O2 sensor on downpipes changed (this stopped the hesitation)
MAF swapped out and changed.
ECU Swapped from an STI to and STI RA.
Since then I have had no more hesitations but now the car is idling up to 1100 at times and surging. It sometimes hesitates is hot then parked up for 30 mins and driven away it may do a few kangaroo jumps then all good again. It also feels like it has a dead band at about 2500rpm where it feels like it wants to hesitate but doesn't. All a bit odd really.
Any suggestions would be greatly appreciated guys.
Last edited by MikeWRX03; 10 February 2016 at 04:57 AM.
#3
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Hello mate. I don't see how you came up with that solution? The WRX block and STI block are fairly similar are they not apart from different compression pistons and strengthened internals?
Surely putting STI components onto a WRX engine is going to make it run like an STI but may lead to more stress on the engine? I have not wound up the boost and it runs well. Seems like a smaller problem than a toasted engine?
Why would you need to tune and STI Ecu if you are running STI MAF, Injectors and ECU?
Surely putting STI components onto a WRX engine is going to make it run like an STI but may lead to more stress on the engine? I have not wound up the boost and it runs well. Seems like a smaller problem than a toasted engine?
Why would you need to tune and STI Ecu if you are running STI MAF, Injectors and ECU?
Last edited by MikeWRX03; 10 February 2016 at 09:42 AM.
#4
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A standard STI does not have a decatted DP and you have not tuned your AFR's for this so this could be your problem.
So Jay is correct,you could be running lean and toasting your engine.
Do you have an AFR gauge fitted?
So Jay is correct,you could be running lean and toasting your engine.
Do you have an AFR gauge fitted?
Last edited by ossett2k2; 10 February 2016 at 09:56 AM.
#7
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Thanks guys. I am running BP 98 Ultimate over here. It seems to be running much richer than leaner looking at the tip of the exhaust. What would be the best way to get it tuned properly? Open source Link ecu or ecutek reflash of the ecu?
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#10
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I take it this is bad then? Apart from the cams being different and the heads being a slightly lower compression then changing the ECU and maf, injectors and turbo would it not run ok? Essentially changing the components to think it is running like an STI but not turning the boost up too much.
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