Death at high RPM

[johnr]

Good day all, "I'm starting to dislike 2s"
I have tried to look for this problem by reading some of your other forums without luck . Perhaps one of you can help.. Have a 91 Non-turbo 2.2. As vehicle accellerates quickly and PRMs reach about 6K (on hard accelleration) or so, the engine seems to die for about a second or two, like cutting out. Don't get me wrong..the engine doesn't stall, stop or die completely. It's like a loss of total horsepower. (It's also like,) I can feel the accelleration, no missing, good power feeling then all of a sudden there no load at 6K. During this time/instant, the RPMs shoot-up due to no load until I let off the pedel and the RPMs drop back down agian. I don't think its the clutch becouse I would have slippage prior right from start of accel.
I hope this isn't a tuff one for you MR2 Dudes . And yes, She's all timed up with a new distubutor,distrubutor cap, rotor, wires, plugs, ignitor. With all these new items she worked well untill two days ago, so its not the new parts put in wrong. Thanks for any help, ideas or suggestions Johno

[johnr]

I guess the Mech/Techs are a sleep?

[MR-355-5sfTe]

does it do this everytime you take the rpm's that high, or only sometimes?
is it a manual or auto? possibly something in the tranny? give all of us some more info on the car.

[johnr]

Thanks for your responce, It's a 91 manual and its happening all the time. Come to think of it, it was first noticed a week or so ago in the driveway when my kidlet "son" was reving err up. Just a few quick flicks on the pedel getting her to couph out any carbon. The same thing as per driving as stated earlier. The only differance however, in the driveway it was in neutal (no load)and we noticed also that every time this happened the "check" engine light flickered during this short power loss/die situation at 5 to 6K. We completed a dia check however no codes came up stating there was a problem??? Hope this gives you a little more info. I really am thankful. Johnr

Originally Posted by MR-355-5sfTe

does it do this everytime you take the rpm's that high, or only sometimes?
is it a manual or auto? possibly something in the tranny? give all of us some more info on the car.

[vtsuckah]

Well for one thing, don't take your rpms that high with a NA! The power band cuts off at around 5250prm or a lil lower, so there will be no "umpfff" when you go beyond. I shift between 4750-5k if I want to accellerate hard. There is plenty on this topic on mr2OC.com.

I believe you're under the impression that mkII NA's are fast cars. Think again my friend, If you want speed, buy a mkii turbo or do a motor swap. You will not be able to have a speed machine in a NA without spending mass amounts of money, and still, you won't be any faster than a mkii turbo that has a boost controller. A NA is not for straight line racing, it's more of a handling car.

[gkcopperdrag]

Is it possible he's just hitting the redline fuel cut-off? It would do what he's saying, anyways.

[vtsuckah]

right you are

[badazzlegnd]

tps sensor?

[Strat42586]

I wouldn't know, but i would assume that the NAs have a fuel cutoff higher than 6k rpms. And since I don't think it would be accelerating so fast that the tach can't keep up ( ) i don't think it would be fuel cut. But with the flickering check engine light, maybe something installed within the ignition compnents you changed is bad and is causing the car to stutter and nearly die. Maybe distributor rotor or cap?

[johnr]

Thanks for great the info, I'll tell the kidlet to drive like a granny. I didn't know that the "2s" computor had a RPM saftey cutout / fuel cut off. My kids "redline mark" is 7K You would think that this cutout would be set at 200 RPM over the redline (any more and you blow parts). I wonder why they didn't put the redline mark at only 5.5K. In other words, why have it if you can't take it there? (becouse it looks pretty). Like I said earlier, this just seemed to happen "after" a couple of years so...we don't try to redline or come close too often. I'm really old school, where most shifting is done be ear/feel of horsepower. (grow up without tachs).

Originally Posted by vtsuckah

right you are

[Drifting Dane]

The redline on the 5SFE (MR2 2.2L) is 6250... The redline for the turbo is 7000. You probably have turbo gauges in your NA.

I have taken my NA MR2 up to the rev limiter a few times... and long story short i threw a connecting rod. Stay away from high RPMs.

[KAOS]

Originally Posted by gkcopperdrag

Is it possible he's just hitting the redline fuel cut-off? It would do what he's saying, anyways.

that would be my guess as well.

you guys should either back off it and not try to drive it so hard, or build it for more power and RPM (within reason, of course).

[bwa-msn]

Just curious if you ever found out what the problem/solution was. I have a 1991 Turbo and it suffers from the same cutting out problem (or a similar one). Under even normal acceleration the engine cuts out for a second or two at as low as 3500 to 4000 rpm. The check engine light comes on for a second or two and then it goes out again, just as you mentioned. It made for a very nervous three hour drive back from Chicago on Friday afternoon.

[MR2crazybyong]

i dont think its a fuel cut, because as johnr said, when it reaches 6K the RPMs shoot up because of no load. if it was a fuel cut the RPMs would not shoot up due to the fact that the fuel has been cut out so the engine would not rev that high. the problem must be in the tranny that when it reaches high RPM, something disengages. have it checked by a qualified mechanic.. good luck!!

[Pineapple]

Max torque at 4400RPM, max HP at 5400RPM. I have no idea why you'll shift at 7000RPM.
Could be coil too old and can't supply enough power for spark. Could be injector max out. Could be damaged bearing from reving to 7k.