MSefi.com read only forum (Jan.15,2018)

Ms2 v3.0 2.68 code. Megatune..

2JZ-NAT EDIS6 Trigger wheel.

I have been tuning my engine while driving it.. Noticed my Decel Cut light is turning on, while accelerating and in boost. Fuel is being Cut while driving. This is causing my afr's to go lean. During hard acceleration the light blips on for an instant. But on a steady highway cruise it comes on and my wideband gauge shoots up to 22.0 engine starts to stall, so I immediately let off the gas and the afr's go right down to 12.5. Engine runs normally.

I have the Decel fuel amount set at 100% in acceleration wizard, Read that this keeps fuel from being cut.

Looking for suggestions on what to try to eliminate the Decel Cut light turning on, causing Megasquirt to pull fuel. Im still researching this..

Thanks in advance

dexter72,

The behaviour you see is usually due to your TPSdot threshold being too low, and as a result accel/enrichment or decel/enleanment is being triggered by noise in the TPS signal. So you will probably want to raise that parameter's value.

What you see could also be caused by the MAPdot threshold being to low, so you might need to raise that too.

There is more information on this here: http://www.megamanual.com/mt29.htm#tl

In general, posting your MSQ settings file and a datalog that illustrates the problem will get you better advice as we will be able to see what is going better on in many cases.

Lance.

Thanks Lance,

I was going through the manual and trying to find this answer, I will post a log as soon as I do one. I found a couple of posts on threads about the Tps dot and Map dot threashold. I was going to try changing it this eve but didnt get home early enough to do it.

I appreciate the response. I will repost with a log file after i make some changes and see if this is still going on..

Dexter

Don't forget to post your msq along with your log, after you have made any changes.

Ken

Thanks kjones, Cant drive the car again until saturday morning, so i will see what happens then aftr i make the threshold changes.

Thanks for the suggestions, I increased the Mapdot threshold value and the Decel Cut light is not coming on anymore during cruising or acceleration.

Wideband readings are more steady as well.