So few days ago i was out data logging and my car was running spot on with 11.0 afr when all of sudden i felt a loss in power, i seen that my afr gauge was showing im running 10.0 pegged out and when i came to a spot it was still pegged out at 10 for a min till it went back up, iv cleaned the maf n map sensor, also torque down sc to spec. The car will run normal for the first few pulls and then it pegs rich again. I didnt have any cels so this is what is worrying me

 

Spot on 11.0?....

 

try reflashing thr tune

 

Check Ur narrowbands just to see if Ur wideband isn't going wacko on u. 800-820 i think should be around 11.0 afr

 

Meaning that the wideband will lean out to 11.0 afr as i near redline, this is just the first revison of the base tune and the base tune was not doing this.

Ill try that thanks.

how do u check a narrowband, and what sensor is considered the narrowband?

 

Front o2 is narrowband. & check it for mV with hpt while tuning.

 

& I was just curious if 11.0 is the afr you're aiming for.....

 

^^^^Sez teh master tooner

 

I told james my goals and my mileage and he does the tune, i think im end up around 11.3 to 11.5 but i dont know whats best tho so i leave that choice to james.

K will do.

 

Narrowband has nothing to do with wot afr. Wot engages open loop fueling

Unless op, just to clarify... Are you saying your cruising or idling and go from around 14.7 too 10.00, and back to 14.7
Or your going wot, hitting 11.00 then after a couple pulls pegging 10.00 afr during wot?

 

Ok i will try and explain this better but its basicly the second choice u said 100% meth, when i go wot i hit 11 afr, after a few pulls something happens and when im wot I hit 10 afr pegged out, when this happens if i pull over my afr willstay pegged at 10 for a min and then start to return to the normal 14.7 idle.

 

Are piston protection and cat over temp turned off?

 

I was not having misfires until today so i think it is running rich and coated my plugs giving me misfire about to pull my plugs to check.

 

When you pull the plugs and replace, swap a different cylinders coil pack into the misfiring cylinder.

If the misfire continues, but now in a diff cylinder. Problem found

 

Im not sure, can I open my tune and see that as an option?

 

Im uploading a pic of the plugs before this problem about 1k miles ago and one of the plugs after this problem.

Plugs before problem!



Plugs after problem!

 

yes

That definitely looks like a bad plug now.

P0101 right? Random misfire in cylinder 1?

Swap the coil pack from cylinder 2 into 1, and one into 2. See if the misdirected jumps from p0101 to p0102

 

piston protection is enabled at 8192 rpms, so im guessing that means no. I didnt see any thing that said cat over temp thing. I had a lil misfire in 2 n 3 could any of that be the cause of me going 10.0 afr or is this the result from going full rich?

 

I have no codes, and whats best plugs to get for a 2.7, 80s, m62 on gas and on e85? Im currently running gas but once I fix this issue and finish data logging im swaping to e85.

 

engine DTC tab

 

Cot is what your lookig for, its abbreviated in hpt under fueling section tab.

10.00 can cause a mess of problems, misfiring in those cylinder are one of them.

 

Misfire code is P030x.

P0101 is MAF related.

 

Autolite 3923 1 step colder copper plug

$8 a pack

 

Doh, would of helped if i referenced it wouldn't it of. Word, thanks for the correction.

Correct procedure, wrong code. :p

 

Vander if you throw a code eventually, post up. I could print up the trouble shooting procedure from alldata.