Misfire at 5200 rpm
 

I jumped on the dyno today and discovered I have a misfire at 5200 rpm.

Kind of fixes itself after that but its constantly there right at 5200rpm. I made 5 runs and everytime it was at 5200rpm.

Is this the opti?

I have a surge at idle sometimes too.

Re: Misfire at 5200 rpm
 

Does it look like a dip? But yes, I would say 95% it's your opti.

Re: Misfire at 5200 rpm
 

Yes its a dip followed by popping from the exhaust.

I did bleed my cooling system a few days ago after which the surge at idle started.

If it is the opti, should I get a complete new one or just cap and rotor?

Re: Misfire at 5200 rpm
 

Just get a new one. I know it will be expensive because it's a non vented unit (unless you converted over), but it's not worth changing just the cap and rotor in my opinion, unless you have scary prices for these in Canada.

Re: Misfire at 5200 rpm
 

Thanx dude.

So you would say most probably opti. Not anything else?

Re: Misfire at 5200 rpm
 

I've seen it many times on dyno sheets and it was always the opti.

Re: Misfire at 5200 rpm
 

Do you mind if I email you a pic of the graph when I get home? It did it on 5 runs at 5200rpm.

You can see a dip in the rpm band, horsepower, and torque followed by the air fuel ratio curve going fat.

Could the opti also cause the surge at idle?

Re: Misfire at 5200 rpm
 

Yea, the opti can cause a surge at idle and lower rpm as well as high rpm as in your case. You can email me the graph if you want.

Re: Misfire at 5200 rpm
 

ouch..buying an unvented opti in canadia....thats like 23 grand:(












:D

Re: Misfire at 5200 rpm
 

Yeah I might have to sell one of my sled dogs and my Mario Lemieux hockey stick for one. :D