Rep Power: 764

I have thrown a ses light.
I used hp tuners and i am thrown a P0300 code witch is a missfire I looked to see what cylinders are misfiring and they are #'s 7 and 8. I have changed out spark plugs, spark plugs wires cleaned maf and still throws thoes codes. Anyone have any other idea of what it might be??:banghead:

 
Rep Power: 1125

do you have an aftermarket cam? Check the plug wire connector at the coil also (just had that on the gp)

 
Rep Power: 967

how do you know its 7 and 8? P0300 is for random misfire...

 
Rep Power: 764

No aftermarket cam yet
I changed coils and made sure everything was on

 
Rep Power: 764

I used hp tuners scan tool

 
Rep Power: 764

I'm going to rip into the heads and look at valve spring, push rods and rockers tomorrow. (Side note I have not done any new mods) it just happin last week

 
Rep Power: 766

PO300 means RANDOM MISFIRE DETECTED. That means mulitple cylinders. If it was a count on #7 and #8 going though the roof it would set a code for those cylinders.

If you had valvetrain problems you would know it by now, LOTS of mechanical noise, VERY poor running and power. Save your time. You may have just got a tank of ****** gas.

 
Rep Power: 764

Found out it was a nice header leak
Got that fixed no more ses light

 
Rep Power: 967

thanks for the info, but i dont give a ****. if you had a misfire on #7 and 8 you'd also get a P0307 and P0308 as well.

 
Rep Power: 764

 
Rep Power: 0

That's awesome to hear, there's nothing better than an easy fix.

 
Rep Power: 772

No Kidding.....what's up with that? He just told you what tool he used.

I'm glad you figured out what it was bro ~

 
Rep Power: 794

glad u found the problem and atleast it wasnt a big problem to fix