hilton0315

1992 civic dx sedan d15b7 new fuel pump plugs wires cap rotor fuel pressure regulator throttle body but still stumbles with a popping noise(detonation) in exhaust manifold and lacks power. if i pinch off the fuel return line at the regulator the car runs real strong and perfect. unclamped it wont accelerate much but seems to be ok in park and neutral. help please. update!!!!!new map sensor, no luck. car will run ok for a few seconds then like crap with a dtc 1. o2 tests okay fuel press. ok. can any one please help, im at the end of a short rope with this car!!

RonJ

Measure the fuel pressure with and without the FPR vacuum hose connected and check the ignition timing with a timing gun.

hilton0315

fuel pressure is constant throughout problem at 35 psi hose on 45 psi hose off. still dtc 1 new o2 sensor now still runs bad going to tackle ecm next i geuss

RonJ

Did you check the ignition timing with a timing gun and the service connector jumped?

For code 1, have you checked the O2 sensor wires (voltage, shorts, continuity)?

hilton0315

just checked timing--ok. replaced ecm--ok. distributor--ok. still runs like crap
compression check tomorrow

hilton0315

its fixed, clogged fuel injector screens.