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Old 07-10-2018, 11:50 AM   #1
Scooby Specialist
Member#: 13530
Join Date: Dec 2001
Chapter/Region: NWIC
Location: Cascadia
EA63 , EA81T, EJ20G,

Default V1 EJ20G High Load/High RPM Cutout

I'm in the process of resurrecting an EJ20G-powered 1987 RX coupe. As I catch up on the two previous owner's deferred maintenance, I've noticed that the car tends to cut out in high load, high(ish) rpm situations. It almost feels like a boost/fuel cut or a rev limiter, but I don't believe it's being caused by those safeguards. This happens after a few WOT pulls through the gears at my low boost setting (10 psi) and pretty quickly at stock boost (14 psi).

I've gone through the fuel system, new 255lph Walbro, new filter & soft lines (original, stock injectors though, waiting for my RobTune to upgrade). I've done the EJ coil-on-plug conversion in preparation for a RobTune, new NGK Iridium plugs (out-of-the box gaps), new green label MAF and I have a new, OEM o2 sensor that I'll be installing shortly.

The problem seemed to improve after the new fuel pump (can make more heat soaked pulls at 10 psi with a couple more pulls at 14 psi before it cuts out).

I spoke with SuberDave, who built the car, and he suggested dropping my plug gap down to .2xx, since he had experienced spark blowout on a similar set up in the past.

What do you folks think? I don't want to install the RobTune ECU and 550 injectors until I've got this sorted out.
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