Okay so i got my car tuned recently and soon after i developed a misfire between 2 and 3k rpm. I can't figure it out. I hold the throttle under 10% and soon after it spikes to 15.5-16.5 afr and starts to misfire and carry on. I notice the ign at about 30 degrees at this point. More throttle and it seems to correct itself.
I didn't want to make any adjustments to ign unless i was sure that was causing it. I was thinking it was more likely fuel. But nothing tells me that. You can see between 4:25 and 4:47 on datalog.
Stock h22a ihe
S300
98 ek hatch
Problem w/ part throttle misfire. Help!!
Problem w/ part throttle misfire. Help!!
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Re: Problem w/ part throttle misfire. Help!!
Have you contacted your tuner about this?
Re: Problem w/ part throttle misfire. Help!!
No I figured if it was something simple I could fix it it without having to bother him.
Did you see anything unusual in the log?? Plus I was trying to gain an understanding of the program a little better and thought who better to ask then you guys.
Did you see anything unusual in the log?? Plus I was trying to gain an understanding of the program a little better and thought who better to ask then you guys.
Re: Problem w/ part throttle misfire. Help!!
The ignition timing between load columns is too big - e.g. @2,750rpm - 5 (31.25) and 6 (25.5).
Look at the stock map for the spacing and overall shape. Remember play SAFE and RETARD first, unless you have means to detect knock; if not take it to your tuner.
Analyse/graph the gradient of ignition curve from Decel to Light Cruise to WOT at each rpm band, from 2,000 rpm to 3,000 rpm - the ramp of ignition timing advance on throttle-off ( Light Cruise loads to Decel loads), starts to increase as revs drop from 3,000 rpm to 2500 rpm. You may need to do this in a spreadsheet, graphing the timing vs MAP at each rpm as visualising it from the s300 2D/3D (rpm vs load) is not that obvious.
As you change your timing, what your fuelling in that area.
If you are a novice, it may be faster/easier for an experienced tuner to fix.
Look at the stock map for the spacing and overall shape. Remember play SAFE and RETARD first, unless you have means to detect knock; if not take it to your tuner.
Analyse/graph the gradient of ignition curve from Decel to Light Cruise to WOT at each rpm band, from 2,000 rpm to 3,000 rpm - the ramp of ignition timing advance on throttle-off ( Light Cruise loads to Decel loads), starts to increase as revs drop from 3,000 rpm to 2500 rpm. You may need to do this in a spreadsheet, graphing the timing vs MAP at each rpm as visualising it from the s300 2D/3D (rpm vs load) is not that obvious.
As you change your timing, what your fuelling in that area.
If you are a novice, it may be faster/easier for an experienced tuner to fix.