Mechanics

I CANT FIGURE OUT MY RANDOM CYLINDER MISFIRE IN ALL 6 CYLINDERS.

1996 Chrysler Sebring • 166,000 miles

My vehicles check engine light flashes quite often at random times, and random speed. It gives me random cylinder misfire codes from P0300 to P0306. I have changed the EGR valve, distributer cap, rotor, plugs, and wires and would like to know where to go from here.
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Kodyclarence
October 7, 2012.




Ok. Well ill check fuel pressure and change the fuel filter first. I can imagine that is cheaper than the PCM. I have had the vehicle for 2 years now and haven't changed the fuel filter and I highly doubt the people that had it before me did either. Ill throw some Sea Foam in the tank afterwards as well. If that doesn't solve the issue and I get a new PCM will I have to get it flashed like an ECM?

Tiny
Kodyclarence
Oct 7, 2012.
Changing the fuel filter is not as easy as it seems for the V6. You might have problem accessing it and according to the manual, the tank has to be drained and partially dropped.

KHLow2008
Oct 7, 2012.
That's ok. I've got a car lift and a transmission Jack. I noticed that it sputters and misfires A LOT more when I have overdrive off. I usually drive with it on.

Tiny
Kodyclarence
Oct 8, 2012.
With OD off, the engine would be runnig at a higher rpm and with more engine torque, the misfiring shoud be felt less.
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KHLow2008
Oct 8, 2012.
It runs around 3500 RPM with OD off on the highway and it does misfire and sputter a lot more. Then when I turn overdrive on and the RPMs drop it stops. Sputtering and misfiring as much.

Tiny
Kodyclarence
Oct 8, 2012.
Get the fuel filter replaced and see if it makes any changes.

KHLow2008
Oct 8, 2012.
Ok. Ill do that.

Tiny
Kodyclarence
Oct 8, 2012.
I changed the fuel filter. It was bolted to the frame so I did not need to drop the tank. But it is still misfiring : /

Tiny
Kodyclarence
Oct 12, 2012.
Are the trouble codes still showing the same codes or are there any additional codes?

KHLow2008
Oct 12, 2012.
They're all the same.

Tiny
Kodyclarence
Oct 12, 2012.

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