rough unstable decel/idle
rough unstable decel/idle Bill(foff) and Mike(ws6firebirdta00) have come across this issue with Hurley711. On decel, the cars rpms dip and the idle is rough. Now most have said RAF and throttle cracker and follower. I have messed with all of these with no joy. Ive pulled the TB apart and cleaned, didnt change anything. map is still where it has been from months ago. no change in that. It started happening after I dyno'd the car. I was in maf mode. before the car would do that with the maf plugged in, but it even does that in SD now. any ideas?
It dips below the desired RPMs and sits there for a second or two and then recovers? Or does it dip under the desired idle rpms and recover quickly? Do you have a log and the BIN file we can look at? 
its dips and then climbs back up slowly. i havent logged or tuned in months 
just been out of it. ive even got a new lc1, but i havent installed it yet. Right now im just looking for ideas as to what it could maybe be.
just been out of it. ive even got a new lc1, but i havent installed it yet. Right now im just looking for ideas as to what it could maybe be. 
TECH Fanatic
Joined: Aug 2005
Posts: 1,691
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From: Sunny London, UK
cracker and follower decay maybe. But most likely cracker.
You can tell it to hold the throttle open a tad more.
If you decel and keep a light touch on the throttle does that fix it?
If so then definitely add some air to cracker. It will have the same effect.
Look at what your spark and afr is doing during that time too for extra checks.
You can tell it to hold the throttle open a tad more.
If you decel and keep a light touch on the throttle does that fix it?
If so then definitely add some air to cracker. It will have the same effect.
Look at what your spark and afr is doing during that time too for extra checks.
that sounds good. i tried to put the stock tables back in thinking it would help, but when its cold, when i decel, it sticks at about 1500 rpm until it warms up. however, it still dips. i do have to tune my afr and ve again. question is, why would it do it after my dyno when the tune didnt change?
