F-bodyLuv

So i replaced my Plugs/Wires last night after my SES light started blinking. A diagnostic told me it was a random misfire. Still doing the same thing. What else could be causing this.

After i installed my wires and stuff i took it out for a drive. Shut it off, then when i turned it back on it started, went to a really low idel, then died. Started it again at it was fine. MAN, im getting tired of this problem lol.


Any ideas?

Silver Wraith

I have also been plagued with an ses light diagnosed as a random misfire. Mechanic says it can be one of the most difficult to track down... anything from clogged fuel injectors to a faulty mass airflow sensor.

wilddawg

try putting some really strong injector cleaner in the tank. A clogged injector will give you a misfire. A half bad injector will do the same. If the intake gasket is leaking into the combustion chamber this will give you a misfire. Hint. Losing fluid and you have no leaks that is visual. Check the bolts on all the coils on may not be grounded good or have some corrrosion.

Zero30

iTrader: (6)

check your o2 sensors i had the same problem.

tonyt123blue

iTrader: (8)

mine does it at idle.it started after I changed my cam.so I am kinda thinking it is in the tuning for me.

JamesO WS6

Be very careful with "GOOD" injector cleaner. Not off the shelf stuff that doesn't work. I mean the real industrial stuff, I have bent valves that way. If you dislodge a good piece of carbon, not compresable, it WILL do damage in your engine. Not to scare you, just enlighten you.

bluedrago

iTrader: (1)

Heres a story for you....when I bought my car its a 98 TA and it ran ...."off" didn't seem that bad it was just slow...long story short I had a misfire cylinder one...and a knock sensor code. I do some stuff then pull the valve cover to find a bent and broken intake pushrod. Good Luck.

LT4Vette

I am basing my experience with my tuning of LTx engines. Very common to have the PCM tell you have a missfire with a cam change. The missfire detection is based on crank rotational speeds. It uses the Crank Position Sensor to estimate a missfire. So if you have a lopey idle it would see that as a missfire because the crank is not rotating as smooth as a stock. A lot of tuners remove the missfire detection at lower rpms.