idle surge from 1200-2000 rpm
My 93 rx7 is surging at idle from 1200-2000 rpm. This is a fresh motor with a new standalone ECU. I've done the following things to troubleshoot:
AWS is removed and blocked off vacuum nest is removed and blocked off where appropriate EGR is removed and blocked off fast idle cam screw is removed (same problem with it installed, no difference) vacuum leak test with fog machine vacuum leak test with spraying carb cleaner around possible leak points vacuum leak test with propane around possible leak points checked IAC wiring checked IAC PWM settings (244hz) checked TPS wiring checked TPS settings checked that the spark plug wires are going to the right spark plugs checked coil wiring checked injector wiring checked fuel pressure played around with TB idle bleed screw (adjusting made NO difference) tried adjusting ignition timing from 0-40 degrees at idle, definitely a difference in how it sounds but still surges the same Any ideas? |
Originally Posted by flagrant
(Post 12050393)
My 93 rx7 is surging at idle from 1200-2000 rpm. This is a fresh motor with a new standalone ECU. I've done the following things to troubleshoot:
AWS is removed and blocked off vacuum nest is removed and blocked off where appropriate EGR is removed and blocked off fast idle cam screw is removed (same problem with it installed, no difference) vacuum leak test with fog machine vacuum leak test with spraying carb cleaner around possible leak points vacuum leak test with propane around possible leak points checked IAC wiring checked IAC PWM settings (244hz) checked TPS wiring checked TPS settings checked that the spark plug wires are going to the right spark plugs checked coil wiring checked injector wiring checked fuel pressure played around with TB idle bleed screw (adjusting made NO difference) tried adjusting ignition timing from 0-40 degrees at idle, definitely a difference in how it sounds but still surges the same Any ideas? Could be poor fuel tuning causing misfire. |
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