Ford Mustang Forums banner
1 - 5 of 5 Posts

· Registered
Joined
·
655 Posts
Discussion Starter · #1 ·
EEC IV with Quarterhorse and TunerPro RT.
Decipha has my car tuned pretty well. I was complaining about low speed bucking but after playing with dashpot settings and feeling what they do I realise I am not dealing with bucking, but rather more of a harsh tip in issue.
When going real slow, actually any speed…it’s just more apparent when moving slowly, off idle tip in is harsh in a way that jerks the car. When lifting off throttle, or when dashpot lets off, you feel it as well, just not as harsh.
Is that generally a spark or a fuel issue, or could it be both? Is there something I could be on the lookout playing back a log?
Car runs fantastic otherwise.
Cheers.
 

· Registered
Joined
·
2,922 Posts
If you unplug your iac and drive it around, does it still happen? IF not, its dashpot for sure. I know you said it doesnt seem like dashpot but it sounds to me like dashpot preposition. Basically when you come off of closed throttle, the iac is opened to a specific amount and that amount is too much. I would try reducing the 2 lowest preposition points by 10% and see if it helps. If you have already tried that, im not sure what it would be.
 

· Registered
Joined
·
655 Posts
Discussion Starter · #4 ·
Well, whadayouknow. Got her warmed up and went for a slow cruise, pulled over to disconnect the iac and other than a bit of drivetrain loading/unloading I can comfortably cruise in 2nd or 3rd at around 15mph easily.
So I guess I’ll keep playing with the lower rows of airmass until it’s perfect.
Thanks Dwain!
 
1 - 5 of 5 Posts
Top