crazyelf

iTrader: (21)

I recently acquired a 2000 SS 6spd so that I can retire my t/a as a fun only show car. Yay! Right? Wrong.
The car keeps intermittently misfiring on cylinder 4, it will run perfect then suddenly misfire like crazy and set the flashing ses light a few miles later it will run perfect again.
I've replaced plug, wire, fuel injector and swapped coils.
Any ideas guys?

Sprayed1998

iTrader: (10)

Have u pulled valve covers?

crazyelf

iTrader: (21)

I have not, I figured if it was valvetrain related it would run bad all the time.

99Bluz28

iTrader: (35)

Have you checked the Ignition control wire for cylinder 4, from the pcm connector to the coil bank connector, and to the coil connector ?

crazyelf

iTrader: (21)

I haven't checked wires yet, I'm thinking its something electrical as well. Is there a good site for wiring schematics that you know of?

99Bluz28

iTrader: (35)

This will help.

http://ww2.justanswer.com/uploads/dt...224852_pic.gif

Turbo306Fox

iTrader: (3)

Same thing happened to my car it would run perfect then randomly start missing then go back to running fine pulled the valve cover everything looked fine couple months later it started knocking in the head it had a bent valve and eventually broke a valve spring and bent the pushrod. Slapped some new heads on it now its good

Old Geezer

iTrader: (3)

Data log it, and post the log[s]. Someone may spot the issue[s].

Reckless

iTrader: (9)

Check continuity on the injector wiring for that cylinder. I have a few wires break inside the insulation on my old car. I checked continuity from the connector back to the PCM. As i would wiggle the connector it would lose continuity. Replaced the connector/pigtail and it was cured. This can happen if the car has been worked on a bit from pulling on the injector wiring. There are only about 4 strands of very thin copper inside these.