Car dies after foot off accelerator

arnold · Post by **arnold** » Sun May 14, 2006 12:12 pm

MS1 V2.2, MT 2.25 code ?? I dunno, didn't change it

The engine is not running perfect yet, but the car is driveabke. It is a supercharged Austin Healey Sprite (A-engien as in Mini). When I rev the engine a bit and take my foot off the pedal, the car dies. This ALWAYS happens (warm or cold), which settings I have to change for that?? What causes this? Decelelartion settings??

boost junkie · Post by **boost junkie** » Sun May 14, 2006 1:15 pm

Looking at a datalog will help figure out whats going wrong. Cature one and post it up here along with your MSQ file. Also need to know what firmware you are using.

arnold · Post by **arnold** » Sun May 14, 2006 10:59 pm

Where do I find what code have? I never changed it...

One of the latest msq's attached, and a datalog (sorry large one, i necessary I can make one only of the 'dying')

Arnold

arnold · Post by **arnold** » Mon May 15, 2006 11:34 am

maybe this graph makes it more clear. It happens when I am just reving the car witout driving it.... pretty annoying

fiat132 · Post by **fiat132** » Mon May 15, 2006 2:13 pm

same thing happens to me but only when its cold and i try to accelerate.

arnold · Post by **arnold** » Tue May 16, 2006 6:21 am

Hi, mine also more when it cold. Maybe this is caused by the auxiliary Bosch valve

It should close after a while.... I checked it really does close by heating it. But does this one close also when the housing is not warm enough? In my case it byepasses the throttle, so the vacuum is less

arnold · Post by **arnold** » Thu May 18, 2006 5:05 am

Anyone?

arnold · Post by **arnold** » Sun May 21, 2006 4:46 am

Well I have an other graph here, what could cause the rpm fall back all the way to cranking status or even die when I take the foot off the accelerator while revving in neutral. VERY annoying amd I don't know how to tackle it

arnold · Post by **arnold** » Sun May 21, 2006 11:13 pm

No one?

MegaScott · Post by **MegaScott** » Mon May 22, 2006 12:27 am

man, I forgot just how simple the old Megasquirt BG code is.

Have you tuned your idle bins properly? try richening up the idle bins a bit. Also maybe you can try to give it some decel enrichment right now you have it set to 100, try going to 125 and see of that helps.

You might want to upgrade to the MSnS-extra code, even if you aren't controlling spark there's alot of advanced features in that code that can help you out since you have a Wideband. Even if you don't use any extra features, you still get 12x12 tables, AFR tables, Better accell enrichment controls, the list goes on.

http://megasquirt.sourceforge.net/extra/