SR20DET rpm dips when applying throttle

[Shirohige]

Originally Posted by zombiewolf513

I did the test kingtal0n suggested but used soapy water and found a leaking throttle body gasket, a very leaky rubber injector seat, and valve cover gasket in cylinder 3. Im going to replace all the intake gaskets and injector orings. My valve cover gasket is new and i torqued to spec so i might need to just retorque the center bolt.

Hope you get it fixed!

Originally Posted by Kingtal0n

If you touch the throttle (while O2 sensor is unplugged) and get a lean condition its either

the maf (a boost leak, pressure leak, poor maf placement, insensitive/dirty maf, etc... maf related)

or

the injectors (wrong size, leaking, not leaking, not opening properly (low voltage or w/e), dirty filthy rail or injectors, fuel pressure drop, etc...)

or

It needs tuning (wrong ecu, wrong tune, poor wiring connections, poor grounding, Bad O2 sensor BLM (Long term memory), etc...)

Because it goes like this:

maf -> ecu -> injectors

Dont tuners usually turn off the 02 sensor?

Got the d-jetro power fc so i run a map sensor. Both my PFC and AVCR map sensors give the same value when idle so i doubt they are dirty.


Got the car tuned with these injectors and made around 300whp (2 years ago) so probably not the wrong size. I did take the fuel rail off and let someone watch the injectors as i was cranking the car a couple of times. Injectors did not leak. Also shouldnt a fuel pressure drop be across the whole powerband? I can rev it easily with no major issues (except a couple of misfires when i hold the rpms).

Im getting a timing gun tomorrow (i did take out the cas after all) and ill set it on 15 degrees. If that does not fix anything ill get it to another tuner and let him handle it.