Since ive owned my car its had a "steppy" throttle. Irregardless of throttle position(wot or cruising ), it does this all the way through the RPM range. The best way to describe it is "a sparatic shot of n20".

mods/attempts at fixing this

-5th/6th wired (didnt affect the problem)
-new plugs/wires
-grounds fixed
-no p/s a/c
-i/h/full catless exhaust
-de-emissioned
-Greddy E-manage (blue,no difference)

is this a TPS thing or what? I thought it could have been a clogged injector, but i tuned OUT fuel.

 

haha, i think it does it at every rpm EXCEPT 3800!

 

Steppy throttle????

A throttle linkage issue would be the first thing to look at, I would figure. And is the E manage a stand alone or a add on? If it is a stand alone then I would also be looking at the throttle body, TPS and/or AFM (if the e-manage uses one).

 

Its more of a mini-bog. While it revs up, i falls on its face for a millisecond and keeps going. Its does it about four times to redline.

-the e-manage came after the problem
-its not a physical problem like linkage

 

so its hesitating at specific RPMs?

 

thanks for you patience, i know im sucking at explaining!

this is a stumble thru acceleration regardless if its WOTor just economy driving. I does it multiple times almost as if its detonating. It really doesnt hinder acceleration, but if there could be a horse or two to gain back....

keep in mind...

-alway running 93
-always has done this(no mods,including the emanage)
-new plug and wires
-emanage is subtracting up to 19% fuel in places

 

check TPS sweep

and stop running 93. I've run advanced timing and 13:1 mixtures on my n/a and have never detonated. you are wasting your money

 

87??? hmm, im all for saving my pennies! My only concern was the amount of fuel i have already pulled from the stock map. I have the timing up a fair bit too.

I would have never gotten that e-manage if my car wasnt so pathetic. My best to date pull was 120whp on a Dyno Dynamics dyno. Compression is spot on, i have a RB header, full exhaust, TRUE heatwrapped cai and EVERYthing deleted. This is why every little thing is a big deal now,


edit: the TPS will be checked tomorrow. I should have already but...

edit again: Should i have had to subtract 10-20% fuel across the board to get a decent AFR? That seems REALLY excessive for a stock ecu!

 

This is a good example of how a wideband 02 sensor/controller would help in trouble shooting. From the description it sounds like you step on the pedal and the mixture goes lean for a moment (probably in high 15 afr or higher) then goes to a normal mixuture in the 12-13 afr.

Just talking, not a clue what is wrong with the car unless someone has been messing with the internals of the afm.

 

not to be a smart *** but....

this problem was there when i bought it and has since been dyno tuned. Then only lean spike was 12.1 afr at 6500rpm. All we did was add timing and subtract fuel.

More importantly, why is my car sooo freakin slow? I have every possible mod except internals( porting etc) and ITBs.

 

Mine just started doing this same thing pretty sporadically. For some reason it seems to do it worse when the engine is especially hot (sitting at traffic lights or extended WOT). For me it is definitely a momentary lean condition. I am normally just into the rich section of the A/F gauge, but it dips way into lean when it hesitates. I haven't really had time to work much on what it is. If I figure anything out I'll let you know.

 

any thoughts on the lack of power?

 

Old, stock engine with low compression? Wiring open the aux ports will kill low end power, too.

The weird thing with mine is that when it was running a little hot at the stop light (195 or so) it was actually doing this at idle. At the moment my idle is at 2k (currently troubleshooting) and it would drop down periodically and lean out at the same time, which to me rules out the TPS.
Does you car do it reliably every time, or just occasionally?

 

>100psi


and yes, you can set your watch to it!

 

Mine appears to be completely different from yours, so I'll stay out with my problems and start my own thread tomorrow.

For you it sounds like it might be a TPS with dead spots. Get a multimeter and test it to see if it has a clean even sweep.

 

thanks for your help, thats VERY high on my to-do list!