Re: EJ22 OBD-1: Fuel Pressure Regulators
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Welcome to the modern age of auto repair. The parts are all crap, everything needs to be rechecked. The residual fuel problem is a check valve at the pump on the VW. another $5. As for the fuel pressure, monitor o2 sensor and fuel trims. The aftermarket will combine part numbers without any knowledge of what is going on. I recently replaced a fuel pump on 1990 GMC syclone, the catalogued pumps all would not support the turbo. Is there a drivability problem with the 43 psi? the o2 should compensate for that. If there was a symptom from the old regulator, maybe it's not the regulator. I would be ok with -15% trim at idle. If highway cruise is more than -10% and acceleration is still in the negative, injectors are an option.
On Wednesday, March 26, 2025 at 04:29:27 PM PDT, Mike Hart via groups.io <mjhart853@...> wrote:
As an addendum to my EJ22 Strange Start Problem debug, I had an issue finding correct and quality parts; perhaps someone has comments on the following?
I bought 2 new fuel pressure regulators (Herko and Beck Arnley brands) - I couldn't find any genuine Subaru units from any of the Subaru parts dealers. Both were supposedly correct for the 1994?Legacy EJ22 that my engine started life as? NOT! Both turned out to be 3.0 Bar (43 psi) units and measured fuel pressure (at Idle) was markedly higher than the original.? Research on this led me to see (in Haynes) that there are different specs for the non-turbo EJ22 ?(2.5 Bar = 36 psi) and turbo EJ22 (3.0 Bar = 43 psi) However all the online?parts listings I can find claim their units work across both engines; obviously incorrect.
I put the old Subaru original back in (it's marked as JECs A44-000R55) to recover the lower pressure
....Any ideas on where to get a 'correct' 2.5 Bar unit from? (Subaru parts dealers have a part # 22670AA050 but they list this for both non-turbo and turbo cars...). Also, how to be sure they really are 2.5 Bar units before installing and?measuring them?
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