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H22A Type-S Running Lean OEM Everything.

 
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Old 01-05-2014, 12:25 PM
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H22A Type-S Running Lean OEM Everything.

I just did a swap in my 98' SH from the A4 to the Type-S JDM engine. I used my usdm wiring harness. Only things I did differently was change the oil pump on the Type S to the oil pump so my Krank Sensor Mounts, also I changed the distributor. Ever since I did the swap my engine has been running very lean as I'm getting A CEL code for lean engine, and also my sparkplugs are pure white. The only aftermarket things that are on the car are megan racing headers, unmarked cold air intake, and an exhaust. I can't figure out what's wrong. I am using the stock ECU that came with my 98 SH. Thank you for looking.
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Old 01-05-2014, 02:35 PM
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Re: H22A Type-S Running Lean OEM Everything.

Someone correct me if i'm wrong.. but the type s motor has a higher compression ratio vs a usdm a4.


So you're more than likely starving it as is. I believe cruiserdude over on prelude power installed a type s a few years ago and hasn't had any issues - i suggest looking into his build and writeup over there.

Otherwise, start considering some fuel upgrades and possibly a tune.
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Old 01-05-2014, 02:50 PM
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Re: H22A Type-S Running Lean OEM Everything.

^ you're right.

i have a type-s motor and I'm running rich, and yes it does have higher compression then a h22a4 so you need to get a JDM ECU for it or get it tuned
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Old 01-05-2014, 09:51 PM
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Re: H22A Type-S Running Lean OEM Everything.

Is there anything I can do other than getting a tune. Like pumping up the fuel pressure? And how bad is it for my motor to run really lean. I thank you two for replying so quickly.
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Old 01-05-2014, 10:09 PM
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Re: H22A Type-S Running Lean OEM Everything.

The factory fuel pressure regulator is not adjustable.

Lean is not ideal, H22's are meant to run a little rich from the factory to prevent worst case scenarios...


The engine will potentially run hotter, and you can have miss fires if you continue to drive it.

If your area does not require an obd2 test for inspection - you can get another ecu and conversion harness to run the car safely. Such as the proper ecu for the type s motor. Or even get a tuneable obd1 ecu and have the car tuned.


Aftermarket fuel pressure regulators are available - but you cannot simply toss one in, raise the fuel pressure and call it a day. I recommend speaking with a local performance shop for your next step.
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