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sup guys i have a 1992 sc300 nat with 2jzgte ecu mod and it has a rich idle around 10-10.7. but runs fine when im moving or cursing. i got the ecu capacitors replaced by driftmotion, that didnt fix anything. then found out one of my injector plug wires wasn't even connected due to a bad solder fixed all the plugs and still nothing. also put a brand new Bosch o2 sensor. after all that the car still idling rich. does anyone have an idea of what else to check before i take it to a shop? bc im running out of ideas.
Sounds like the o2 sensor isn't working, make sure its going to the right pin on the ecu, the ge harness has 2 sensors but the tt ecu only uses one, so it has to be hooked up to the right wire.
Also can check coolant temp sensor and wiring. also what did you do for the IAT. that is too rich to just be the IAT but figured id ask. 440cc injectors right?
You could also have an issue with the map sensor, Id say also check for codes and report back, but if it drives well otherwise the map is probably ok, make sure its reading from a good spot that sees full vacuum.
do not use one of the ports on top of the throttle body, they are ported and not all of those see vacuum at idle. teeing into the fuel pressure regulator vac line works well.
generally these ecu's only need a good coolant sensor, a good map sensor, and a good o2 sesnor to get the afr's perfect, thats with 440cc injectors.
550cc not gonna happen without a piggyback.
thank you for the replay! Im using the 4 wire o2 sensor on the bottom exhaust pipe is that the right pin? i have a 3 o2 sensor ge i believe cali spec. here is a pic of the IAT. also are my map wires right? yes 440cc injectors. the car runs fine pretty smooth when driving and WoT. also my map is connected to a port on the upper part of the Y on the manifold. i didnt use the 3 ports in the middle i heard about the low vacuum on those.
edit: been doing some reading on the coolant temp sensor, which is the last thing i haven't replaced yet. Got the idea of how to could make your car run rich or lean (i didnt know this) but if this was bad would it make my car run that rich?
05-10-19, 09:54 PM
Nat 2jz sc300 rich idle
