I'm stumped (sr problem)

[Josh K.]

I have a s13 Blacktop, on my way to work one day it just all the sudden started bucking over 2800 rpms.
It idles fine, revs clean until 2800 and then sounds like the ignition is getting turned off and on real quick, like a rev limiter.

This gets worse to the point where it won't exceed 2k and won't idle at all.

I checked the maf wires to the ecu and everything is ok. unhooked battery for hours

I put new plugs in it and the old ones look fine

I've tried 4 different mafs. same results each time.
1.7v idle, 2.8v at 2800rpm, hits 2500-2800 and starts on/off/on/off/on/off and smells rich.

I just paid $100 for another maf and I'm sitting here pissed off at my f'ing car.

any ideas?

after the car is warm the MAF volatge settles down to 1.5v at idle but still climbs over 2v heading towards 2800rpm.
I've checked the wiring to the ecu and its fine. unhooked the maf, ran + and -directly to battery and with car idling got same voltage. maf unplugged it idles slightly worse and revs the same.

I'm starting to think my ECU is toast?

I can't have 4 bad mafs?

I checked for error codes. gave a 55, No Malfunction.

Could it be a huge airleak that I'm not seeing?

[TibDrifter]

I have had the same problem with my s14 sr20 and i was having that problem, when the 2800 rpm happens switch the key on and off and if it drives fine than you have a fail safe mode, there is 4 think that can cause that maf, ignition switch, ect and tps. so check those sensors and if those are good than it must be your wiring or ecu. good luck OHh my problems source was a bad ground. Good luck

[cc4usmc]

silverdale huh? me too!! well i know one time i was having problems the intercooler hose conected to the throttle body came off a little.

[krustindumm]

definitly check the other sensors, especially the cam position sensor.

[fliprayzin240sx]

Check your water temp sensor and o2 also.

[Josh K.]

well I pulled the CAS and sure enough the bearings on the shaft had failed causing extreme heat which melted the CAS body wrecking havoc. before noticing the bearing I cleaned it up and she reved all the way past 6Karted running like crap again. I then pulled the whole thing out and noticed the bearing are thrashed.

I'm gonna find a new CAS and hopefully this saga will end!!

:wackit: