So, my T2 is having a hesitation at 3-4k which i power thru and at 4k its a real beast, well tonight i was on my way home from school, SRT4 and I go at it, I bounce off my hesitation, and then fuel cut several times, I cant go WOT it stutters hard, and doesnt put out any power until after 4k it aslo stutters at max boost in any gear after 2nd. And tonight, i just kept on it and it stalled out and died at like 110mph. heh...And i found oil on top of my fan shroud, i think i could have some issues to work out with this thing...stand alone comes next month hopefullly so we'll see if its a new engine and a stand alone, but I wanna check out my duty cycles at full boost....



Any ideas bout this?

so what your saying is you have the classic 3800rpm hesitation? if so i think its a bad ground on the firewall that comes from the secondary injectors...if im wrong someone correct me here.

you hit fuel cut multiple times?



you do know you're going to pop your motor that way, right?



kevin.

I dont understand how fuel cut pops engines?...

Your air/fuel mix leans out and then a apex seal calls it quits.Happens to some TII owners who don't know better.I see you have a haltech.I thought the haltech knocks out the fuel cut anyways?

fuel cut = extreme lean condition



rotary + extreme lean condition = pop



therefore



fuel cut = pop



kevin.

Youre wrong. Fuel cut doesnt = extreme lean. Fuel cut = no fuel.



Theres no fuel at all when it happens and that means youre not lean. Theres no "a/f mixture" present to be lean ( or rich for that matter ). Fuel cut isnt what blows up engines. Its people getting FCD's and overboosting that blow up engines. If fuel cut was so dangerous, why do most stock cars use it to limit RPM?

Ignition cut is what can hurt cars. Cracking manifolds, blowing up exhausts, and all kinda of bad stuff can happen from letting fuel pool up in the ehxuast.









For the record, I do have a Haltech and I do limit my RPM by fuel cut.

most stock cars arent rotary thats why they use fuel cut.



kevin.

Yeah, top end hesitations are bad, but the car seems to be fine other then the usual 3.8k hesitation and its using more fuel then I can venture to guess, somewhere around 5mpg...any ideas on shitty fuel economy????

Things that are bad for rotaries are also bad for stock cars. If fuel cut killed rotaries you better believe it woulr do serious damage to piston engines also. I Am with adamlewis on this one.



tancred, I had an 87 TII that had some serious hesitation problems similar to what you describe and it turned out to be my TPS. Sometimes alot of electical parts cleaner would fix it and other times I had to adjust it. Basically, mine was on its way out and needed to be replaced. There is a write-up with instructions to make a tool to adjust it, I kind of think it was on fc3s.org or com or whatever it was.

i know plenty of piston engines running lean that keep going, klike runnign lean for constant amounts of times.



ever seen a rotary last forever running lean?



kevin.

Ever seen a rotary blow up from fuel cut?







If you say yes, youre just proving you really know nothing about your car, and even less about cars in general ( Which you seem to be doing with every post... https://www.nopistons.com/forums/pub...1047683664.gif )







Fuel cut cuts all fuel. There can be no lean OR rich condition. Theres simply no fuel there. Hence, no detonation.





But hey, if you dont believe me, just ask Hitman why he limits RPM with fuel. Or RETed...Or BMEP Tuning...Or most any other tuner out there.

whatever mr "i cant have a discussion without coming across as an absolute dickhead"



kevin.

Im just going by whats in your sig and the questions you ask on this forum.



Its obvious you dont know a whole lot about these cars, so why go around answering things like you do? All it does is spread misinformation ( which is how you probably got that mixed up notion ) and eventually a complete falsity becomes tribal knowledge.



Im not trying to be a dickhead, I just dont understand why people believe everything they read on these boards and then just pass it on assuming its true. If you dont know the answer to a guys question, dont reply to it giving him some harebrained solution.

I dont know the answer to this guys problem, so Im not replying about it.

Mazda put in the fuel cut to prevent detonation from overboosting (kicks in when the engine exceeds stock boost levels). Why would they bother spending thousands engineering a fuel cut to solve a detonation problem if their design actually CAUSED detonation? Think about it.



Fuel cut cuts off the injector completely. There is no fuel injected, and thus no detonation.



A hard knock will kill a rotary intsantly, this has been proven time and time again. If fuel cut killed engines, why is this guys (and mine) still running?