ka24e rev limiter problem?

[Josh2222]

all right.. my 89 s13 has this problem where if i am in 3rd,4th, or 5th gear and i accelerate past 3500 rpm my car will bogg or like release the throttle but i didnt let off the throttle at all and then it will go back to my throttle control once it gets back down to about 3100 rpm. does anyone know whats goin on? the check engine light has been on and when the light goes off it doesnt do that but i have taken it to a shop 3 times and they thought they fixed it but then the light came back on

[WWJD]

what did they do to it that they thought they fixed the problem? how good is your TPS worken? unplug it and drive it aroud see if it does better (by the way by doen' this you'll get a CEL, not a big deal) wors thing it could be is MAF. check your CEL when it comes on and post up the code

[Josh2222]

umm they changed the V.S.S. connector, and the engine light went off so they passed the smog on it. The light came back on later after i picked it up. They checked the MAF and ECT sensors and they were clean so i dont know what it could be. I have a feeling its some kind of grounding problem but im not sure.

[Josh2222]

whats the TPS? and what is a CEL?

[240RB1]

throttle position sensor and check engine light

[WWJD]

If you paid them for repairs, they need to repair it. sound like they did what they had to do just so it would pass. I've seen it many time's. just cause the MAF "looks" clean dont mean it's worken' right. what codes is your car throwen'? on CEL

[Josh2222]

will removing the TPS screw up the timing or fuel injection timing? umm im taking my car back into the place tomorrow.. i have no idea how to get the codes its throwin... do i need to ask the guy at the shop for the codes?

[neverlift]

will removing the TPS screw up the timing or fuel injection timing? umm im taking my car back into the place tomorrow.. i have no idea how to get the codes its throwin... do i need to ask the guy at the shop for the codes?

in your case start downloading the factory service manual.....then its just remove pasenger kick panel, unbolt the box you see its the ecu 2 bolt,then wiht a small flat head screwdriver and the car in the on (NOT STARTED) position make sure the led in the ecu comes on, then rotate fully CLOCKWISE, for 1~3 seconds and turn it right back CCW if you get 55 your good but you must have a bad wire or someone tried to do the speed limit removal on your ish.

[frosti108]

holy crap i have this same EXACT problem. 3500 rpm. i got another ecu but i havent tried it out yet since my car is down getting turbo'd. i replaced the maf and crap still didnt change anything. i HAVENT tried replacing the TPS yet though, sounds like a good idea.

[frosti108]

as a matter of fact, i recall getting it past 3500 rpm as long as i stay as much out of the throttle as much as possible. this means that the TPS is reeaallllly suspect. im goin to the junkyard asap and picking one up that i saw because the TPS makes sense

[sylviadrift]

well i has this prob and it was my maf but it didi it in all gears... so try unplugging the maf and see if it changes ne thing. it wont hurt nothing.

[DALAZ_68]

i have this exact same situation

but it happens in the lower gear from 2-3 at at around 2k rpm's

i got my TPS from a yard so im gonna see if they honor there replacement policy and get it changed rite there an then... god willing

[i240sx]

shi* happen to me too. but only if i'm on a ramp up to a freeway. when i rev pass 2 alomst to 3 it went back down to 2500 then went back up. but it doesn't bother cuz it only happen wen i'm on a ramp.plus its a 259k single cam.what do you expect...my lights on too. took it to the shop so it would pass smog and they say injector and fuel regulator and o2 sensor but i replace them already. the light still on. but code show injector leak. must b faulty ecu.

[DALAZ_68]

yea same here...uphill is a no no

its bogs so bad

[Josh2222]

yea the mechanic i went to said it was throwin the egr code and speed sensor code for the CEL

[DALAZ_68]

got an update...

i suggest checking compression...injectors and voltage to tps...and frp pressure

if those are all good, then my firiend...like me u need a head rebuild... from what my mech told me (spencer aka Dr1ft Ready here (Sp name) im running lean and my compression is somewhat fine during idle, but drops during load ( i.e. driving)i assumed maybe adding bigger injectors without flashing ecu ( by that i thought, hey more fuel bigger combbustion) wwould work, but id be just dumping fuel and money down the pipe

it needs a head job basically gasket head machined etc.... im so sad right now i feel like getting drunk

on the upside im getting great gas mileage

[ADF932]

This same probelem is going on with my KA24E engine. As soon as I am in forth gearing around 4500 Rpm's , my throttle shuts off , then comes back on as the rpm's lower or i throw it into the next gear or the next lowest. It almost feels like fuel is being cut off. The other day i tested my fuel pressure but its up to specs. The timing is not off since i did a tune up not to long ago. If it helps my Check Engine light comes on and off when it wants to, and my Ecu is throwing the Speed Sensor code. This problem been pissing me off for a while, Especially the other day i ran it on the dyno just for fun and it crap out.

By the Way what causes the Speed sensor code to come on?

[frosti108]

i dont see how an old leaky head would cause the engine to momentarily die out then come back on like clock work, time and time again. and besides, my head only has 75k original miles on it

[ADF932]

I have a slight feeling that it might be the fuel Regulator not holding pressure.

[WWJD]

Ok here we go. I own 2 SOHCCAR A. One of them runs like a champ no CEL lights nothen' Smooth as they get. it has over 225K on the clock so all that crap about it acting up cause of high miles aint so, I beat on mine all day everyday. If you dont maintain it then that your problem.

CAR B. Now the second SOHC takes a dump just like you guys are talken' about. I have to down sift to keep moven' . When I first got the car the CEL was on. Injector leak, EGR function, Speed sensor. I reset the ECU. and the only thing that came back up was the speed sensor. Now the CEL comes and goes. So I'm thinken' its the speed sensor thats causen' our cars to fall on there faces.

I have had every code that you could think of in car a. and have never had this happen. The EGR function, and it would never choke up. Injector leak, never choked up like this. now the speed sensor, is well know to fail on our 240's so this could be why we have this problem. It's tellen' the ECU we are goen' faster than we really are wich causes a fuel cut (governor, speed limiter) Man is it nasty on car b.

[shpaintball]

yes !!! its the speed sensor...i will save you all some time i hope **no promises tho...basically the car cant really tell your speed if your speedo has ever stopped working its likey to be your rev problem...its govenored not sure y it is but it is ...an automatic ecu can fix the problem from what i hear or the tps sensor can also ...i kno it sounds crazy but i tested it ...my speedo didnt work and i had the rev problem...so i swapped out the 5speed for an auto and fixed it ...idol is a little funny now tho but the rev problem is gone just my 2 cents tho : )

[jlwade]

This is a stupid question but does my 1990 SOHC have a rev limiter from the factory? If so, what is the RPM that it cuts in at?

[big monkey racing]

my car does something similar i would rev to about 6000 (Sitting still) and then it would sound like the fuel shuts off. I thought it might be my fuel pump so i put my aftermarket one in. now it revs up faster but it still drops revs at 6000 and now at 5500. should I try un hooking my fuel pressure regulator and see wat happens?

[idriftnsj]

i have a 90 ka4e and mine did the same thing check ur fuellines the one comming from the fuel filter to the rail and the one on top.mine were both leaking under throttle so tighten the clamps they only leak under pressure mine would shut down at 3500t 4000 rpms

[1STGen240guy]

try and replace the throttle body sensor

[Jeff822]

Hey guys I made a new thread about this yesterday but found this one now. I'm having the same problem as you guys. Mine will cut out around 4k rpm in 3rd and the same in 4th/5th cruising on the highway. My speedo doesn't work either so the speed sensor must be the problem then. Once I change mine out with a new one i'll come back and let you guys know if that was the problem.

[Cameron]

if it wont let you rev past 3500 its maf related get yourself a new maf stat

[Josh2222]

well i had the legendary chain rattle problem and it ate through my chain cover, but i thought it was a blown head gasket, so i got my head resurfaced so we will see if it had anything to do with the compression as one of the guys were saying... i doubt it will make a difference, next thing i need to get tires but im going to try to solve this problem.. so im thinking the tps... anybody solve this problem yet?

[s20700134]

i have a similar issue. i have a kae as well. it cutts fuel at the redline and under slightly heavy load and it doesnt give me fuel again till i hit around 3000-3100. im going to try an auto ecu and see if it will solve the issue. anyways, heres a link to the thread i started before i knew this one exhisted. another member had this problem too and he did a few tings to try to fix it. its all there. hope this helps.zerothread/312911

[Jayson240]

The same thing happens to me. 92' kade.

i can tell you that it's not the fuel pump, injectors, cap, rotor, spark plug, wires, fuel filter, cat, or the timing. the head was just rebuilt as well.

what i'm suspicious of are the maf, some sort of short circuit, tps.

i was reading another forum and someone mentioned something about checking the transmission switch for a short. what is a transmission switch?

EDIT: i just talked to a friend and he said it could be the sensor inside the distributor. gonna check it out later and i'll post the results.
Modified by Jayson240 at 9:35 AM 7/23/2009