Thread: Dead spot in acceleration?

Mine hunts when the car is to temp, not while its below temp. I can be getting off of the freeway and go into neutral and it will hunt for idle then level out at 750rpm's solid. As for the dead acceleration spot I can see that being possible with the fuel, however we arent all using the same ECU setup and not using 259cc injectors either.

Shitty, my original post wasn't directly at you or your specific situation. It was directed toward the OP and the people having cold engine issues. I should of quoted the OP.

Now for your problem, you need to go into idle/ base timing mode and set your idle speed as close as possible to the target idle. Your current target idle speed in the ecu is 750 rpm. If your idle speed in the timing mode is far from it, the ecu will start implementing idle stabilization strategy. It will either cut or advance the timing in order to hit the target idle. The hunting you are experiencing is a result of the advancing or retarding of the timing.

The are also other part of the ecu control that will help you with hunting such as fuel cut and more importantly fuel recovery target speed ie when you take the engine out of gear.

Ahhh yea I believe youre onto something here. I manually set my idle to 750 in idle/timing mode. The ECU bin has a base idle rpm set as such:

sigh - If only I had such a beautiful program in which to run this sort of fix.

Hah, what ECU are you using?

Calum basic.

to me it def sounds like a either lean or rich spot in the map which can be either a maf or o2 sensor problem. if its worse when warmed up def could be one of the 2.

Thats what I have, Im just going to edit the bin to reflect the changes and have someone burn it onto some chips for me. All im using is tunerpro, the b13lc.xdf and the b13/VE/333/N60 bin.

well it would be good if you have a wideband that can show you a sweep of the air fuels and then see if the deadspot leans out or richens that way you can see if its a air fuel problem.

Just installed the bosch universal. Car's acceleration is much more stable. Still the revving at idle but the o2 sensor (did the cap n' rotor as well) really made a difference.