Its a 92 with the 4afe auto 110,000 original miles. The past week has been rough. The car has had regular routine maintainence its entire life and has never given me any trouble until last week. The car acts like it is misfiring. That was my initial prognosis. It will idle ok sometimes and sometimes its rough. When in gear its horribly rough. Takes forever to get up to speed. Things I've checked and replaced so far. Compression: about 180 on each cylinder. Timing, even tho compression checked out. Fuel pressure: can't remember now, but checked against acceptable specs and was good. Spark: good on every cylinder. Components replaced: Plugs, wires, cap, rotor button, fuel filter. Thought might be bad gas, drained tank and put new gas in with an octane boost for good measure. Checked for codes, no codes stored. So, now that you know what's been done here is what I have discovered today. Didn't occur to me to check the injectors until today. With engine running I started unplugging injectors one at a time. The only injector that didn't make a difference in idle was cylinder 4, all the rest killed the cylinder whose injector was unplugged. I then used a screw driver to listen to the injectors one at a time. All are ticking (solenoids opening and closing). I pulled fuel rail and injectors to inspect the nozzles. cylinder 4's nozzle looks clean and obstruction free as do the rest. So, all of that said, what's going on here? Can this injector have a blockage inside?
Thank you in advance for any tips.
Linear Mode
