The car doesn't run smooth

Tsuchinoko · Post by **Tsuchinoko** » Wed Sep 16, 2009 9:15 am

I do a lot of straight road and i normally travel arround 3000rpm.

I fell the car go and stop, go and stop not smooth, in fact is nothing very noticiable but for a person who drive it every day can notice.

When this happend i see that afr goes from ~14,7 to high 15.xx/16.xx so i assume that must be a fuel cut in issue.

I went to see on the TPS parameter window and the only function i see is for Overrun Fuel Cutoff (TPS) and that mine is set at 1% wich i think is ok.
Since this happen arround 300mbar of map i should be able to change Overrun Fuel Cutoff (MAP) but my smanager doesn't have it (version 1.4.2).

Why my smanager do not have this function and on the help menu is shown?

Should be other problem?? How can i solve this?

Thanks

Post by **Spunkster** » Wed Sep 16, 2009 9:34 am

Make the parameters window bigger, it is there.

Tsuchinoko · Post by **Tsuchinoko** » Wed Sep 16, 2009 9:53 am

I already put at maximum and i can't see that map function...

Post by **Spunkster** » Wed Sep 16, 2009 10:15 am

Uninstall and reinstall the software from our website.

Tsuchinoko · Post by **Tsuchinoko** » Wed Sep 16, 2009 3:52 pm

Thanks now is ok.

One question i saw that my fuel rail has no fuel pulse damper do you think that can make this issue also?

I will have a shot with 15kpa from 500 to 4000 on the overrun fuel cut off MAP.

I will reply if the problem has gone.

Thanks

Tsuchinoko · Post by **Tsuchinoko** » Thu Sep 17, 2009 1:29 am

The car remain the same after i change the value for 15kpa so is not from that.

I notice that the injector duty cycle when i cruise is always changing beetwen 7~10 and i feel the issue, when i press the throttle this syptom has gone.

The car is pulling ok i have only this issue when i cruise.

fly_n · Post by **fly_n** » Thu Sep 17, 2009 3:19 am

are u running in closed loop?
if so,what do your afr's look like in open loop?

Tsuchinoko · Post by **Tsuchinoko** » Thu Sep 17, 2009 3:53 am

Yes i'm running in closed loop.

If I change for open loop is rich between 11,8~12,5 and seems that this issue is minimized.

Tsuchinoko · Post by **Tsuchinoko** » Thu Sep 17, 2009 3:56 am

Another thing i went to read the TPS with the Smanager and i saw that if i do the reading twice the value change with the throttle in the same position.

Is this normal?

fly_n · Post by **fly_n** » Thu Sep 17, 2009 4:58 am

tps should read same,that would be the first thing to fix.
did u move the throttle at all between taking both readings?

also,is the car actually running rich in open loop obviously or by reading the sparkplugs or is that just what the gauge is telling you?

Tsuchinoko · Post by **Tsuchinoko** » Thu Sep 17, 2009 6:32 am

Gauge.

I realise that when i put on open loop the sympton has gone. I saw also that duty cycle remain stable witch is good.

But why in closed loop this ocurs? There's any way to correct this issue?

Thanks for all the help and concern.

fly_n · Post by **fly_n** » Thu Sep 17, 2009 7:07 am

I'd be making sure that tps is working correct & stable first &/or it is reading 0% at closed throttle consistently when u release the pedal.

then confirm the motor is actually rich at part throttle in open loop & not just a gauge or wideband output error.

if motor is running rich in your closed loop region of the map,then u will have to tune the part throttle much closer to stoic, or whatever your narrowband target is,to stop closed loop from having to deal with such large fueling corrections that it has to deal with now.

Tsuchinoko · Post by **Tsuchinoko** » Tue Sep 22, 2009 6:52 am

Ok, I put a fuel pulse damper and the engine feel's more smooth but the problem still there. So I went to read a doc from hondata that reports hesitation, and after i read i went to change the target voltage on closed loop from 0,51 to 0,8 and the engine now runs ok is not perfect due the map is not tuned (I need to replace my WB) but is ok now doesn't boder at all.
But today the car start to make some rattle during idle and if a put just a bit of throttle lets say 1% tps when i take out the foot from the pedal the engine almost shut's off and then goes to the normal idle speed but always with some rattle.

Any clue???

Thanks

Tsuchinoko · Post by **Tsuchinoko** » Wed Sep 23, 2009 1:27 am

For further people with same issue's the reason for the car doesn't run smooth was like fly_n said the gap between closed loop and open loop is higher than 10%, so the solution is tune the map closer to the 14,7 value in my case. Because my wideband is not working at the moment i have changed the target voltage from 0,51v to 0,8v so the target move from the rich side to be more close to the values on open loop.

About the stall at idle was just a seting problem it was very low. I made the correct setting procedure and now is ok.

Thanks for the help

regularguy · Post by **regularguy** » Tue Oct 06, 2009 5:46 pm

are you running the ac?