Car Jerks when decelerating

chadvandonkey · Post by **chadvandonkey** » Mon Jul 21, 2008 10:51 am

I've had the same problem on my UK CTR with PRA kpro. No matter what calibration I use other than stock the car blips itself on the overrun. I took apart the idle valve and it all looked fine so put it back together and still the same.

Replaced the ECU with factory unit and it's fine so I concluded the kpro or calibration was at fault. I'm still to find a cure and currently have removed the kpro due to it being very hard to live with (crazy random rpm on choke and blipping on overrun). Both problems have yet to be cured even though I've seeked help on here in the past.

Cheers.

Post by **Spunkster** » Mon Jul 21, 2008 11:44 am

chadvandonkey wrote:I've had the same problem on my UK CTR with PRA kpro. No matter what calibration I use other than stock the car blips itself on the overrun. I took apart the idle valve and it all looked fine so put it back together and still the same.

Replaced the ECU with factory unit and it's fine so I concluded the kpro or calibration was at fault. I'm still to find a cure and currently have removed the kpro due to it being very hard to live with (crazy random rpm on choke and blipping on overrun). Both problems have yet to be cured even though I've seeked help on here in the past.

Cheers.

This does not sound like a problem with the ecu or the K-Pro, but rather a problem with the tuning. Since you have not provided a calibration and a datalog showing the problem it is very difficult to diagnose.

tytlyf · Post by **tytlyf** » Sun Aug 03, 2008 9:20 pm

i have the same problem. I think it's related to the fuel status open-cold.
It's always right at 3k RPM on deceleration and at lower rpm's

here's my thread about the open-cold issue. I'd like to see your kal
http://www.hondata.net/forum/viewtopic. ... 1434#31434

magnEsium · Post by **magnEsium** » Mon Aug 04, 2008 4:14 pm

tytlyf wrote:i have the same problem. I think it's related to the fuel status open-cold.
It's always right at 3k RPM on deceleration and at lower rpm's

here's my thread about the open-cold issue. I'd like to see your kal
http://www.hondata.net/forum/viewtopic. ... 1434#31434

no its not

change the overrun to 15 across the board on the advanced tab

mxlu · Post by **mxlu** » Thu Aug 21, 2008 1:34 am

has anyone found a solution to this? it gets real tiring when your in traffic.

roland · Post by **roland** » Sun Aug 24, 2008 12:22 pm

mxlu wrote:has anyone found a solution to this? it gets real tiring when your in traffic.

Solutions are: Overrun cutoff, TPS adjustment, and possibly igniton/fuel adjustment in columns 2 and 3.

My car used to jerk when decelerating but now it is perfectly smooth after I making adjustments to the parameters and tuning areas listed above.

The only time I ever get a (slight) jerk is when I decelerate below ~1200 RPM in lower gears, but this is pretty much unavoidable due to the fuel injectors turning back on.

Bflaker · Post by **Bflaker** » Fri Aug 29, 2008 5:17 am

roland wrote:
mxlu wrote:has anyone found a solution to this? it gets real tiring when your in traffic.
Solutions are: Overrun cutoff, TPS adjustment, and possibly igniton/fuel adjustment in columns 2 and 3.

My car used to jerk when decelerating but now it is perfectly smooth after I making adjustments to the parameters and tuning areas listed above.

The only time I ever get a (slight) jerk is when I decelerate below ~1200 RPM in lower gears, but this is pretty much unavoidable due to the fuel injectors turning back on.

What adjustments did you make in those areas? I've been having this problem for a long time now, and it would be great if I could fix it.

mxlu · Post by **mxlu** » Sat Aug 30, 2008 4:33 pm

i changed my tps, it is now set at 0 and i checked my fuel over run cutoff delay. what adjustment did you do to the fuel/ignition?