is it the cylinder 4 plug...
Ok my car has about 30k on it and a few days ago i started getting this error code. I thought it was my forge bpv b/c i had it about a week then the car started giving this error code which is cylinder 4 misfire. I put my stock bpv back on and the car still gave this code. Whenever i hit the gas hard it goes but its like its stuttering. Has anyone else run into this problem? Right now im looking at the spark plugs and one of them looks extremely red compared to the others.
"Regular" cars today run much longer on their plugs. But our engine is nothing like regular. We run high boost AND high compression. On top of that our ECU is running the AFR very pig rich as a safety factor. All of these factors shorten plug life. I'll bet that when you pulled the plugs they all were very black, sooty looking from the rich fuel mixture.
Heck, I used to run a carbureted small block MOPAR musclecar in my younger days, making probably around 475 horses with a pretty radical cam and 700 cfm carb. Jetted for WOT flow, it would foul plugs like crazy if driven around town very much at slower speeds and lower RPM, I would have to clean the spark plugs or replace them at least every 1,000 miles. If we got tired of pulling them and cleaning them by hand, we'd just run the engine in high gear at or near redline for a few miles to clear the carbon out. Of course that will attract law enforcement if done in the wrong place at the wrong time!
Thank goodness that electronic ignition and direct fuel injection have ended the need for that.
I suspect that on our engines 30K miles for plugs is probably all we should expect and that may be good.
We run high boost AND high compression. On top of that our ECU is running the AFR very pig rich as a safety factor. All of these factors shorten plug life. I'll bet that when you pulled the plugs they all were very black, sooty looking from the rich fuel mixture.
The compression ratio is relatively low at 9.5:1.
There is absolutely no reason for the plugs to be "very black, sooty looking" unless something is broken. The A/F ratio is rich only at WOT and high boost. For most driving conditions, the A/F will be stoich (it has to be because it is a ULEV vehicle).
"Regular" cars today run much longer on their plugs. But our engine is nothing like regular. We run high boost AND high compression. On top of that our ECU is running the AFR very pig rich as a safety factor. All of these factors shorten plug life. I'll bet that when you pulled the plugs they all were very black, sooty looking from the rich fuel mixture.
Heck, I used to run a carbureted small block MOPAR musclecar in my younger days, making probably around 475 horses with a pretty radical cam and 700 cfm carb. Jetted for WOT flow, it would foul plugs like crazy if driven around town very much at slower speeds and lower RPM, I would have to clean the spark plugs or replace them at least every 1,000 miles. If we got tired of pulling them and cleaning them by hand, we'd just run the engine in high gear at or near redline for a few miles to clear the carbon out. Of course that will attract law enforcement if done in the wrong place at the wrong time!
Thank goodness that electronic ignition and direct fuel injection have ended the need for that.
I suspect that on our engines 30K miles for plugs is probably all we should expect and that may be good.
