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[choke]

Hey guys,
So my 93 non turbo won't rev past 4500 rpm
It accelerated ok up until 400-4500 then it just hit a wall, sorta feels like a rev limiter.
Anyone ever heard of this or experienced it?
Thanks for the help

[WashiestSnake]

5-speed or Auto?

[mitch1204]

Yeah, most autos have a rev limiter in P or N to curb young guys testosterone levels, lol.
If it's doing it driving then you have an air or fuel restriction like a clogged cat or fuel filter. Other possibilities are usually obvious by a code or rough idle. I think you would know it if the dizzy or ECM was breaking down. The same with a timing belt if it jumped a tooth.

[Chicken]

swap in a good igniter and see if that helps anything.

this is not suggesting to test the igniter you have in your car, or making an educated guess that it's a good igniter in your car, or watching the tach, etc etc

This is a suggestion to swap in a good igniter and see if that helps anything.  The real fun dilemma to this suggestion is that MANY brand new from the factory igniters do not work. I am unaware that a brand or source or manufacturer specific to the "dead as new" or "dead on delivery" igniters has been determined. So...good luck. No sarcasm implied anywhere in this post.

If anyone gets or has gotten a dead new igniter, please let me know (or post) any info you have on it including price and pictures if possible. Thanks.

[mitch1204]

This is a suggestion to swap in a good igniter and see if that helps anything.  The real fun dilemma to this suggestion is that MANY brand new from the factory igniters do not work. I am unaware that a brand or source or manufacturer specific to the "dead as new" or "dead on delivery" igniters has been determined. So...good luck. No sarcasm implied anywhere in this post.

If anyone gets or has gotten a dead new igniter, please let me know (or post) any info you have on it including price and pictures if possible. Thanks.

I can clean up my old one and send it to you as new. I'll even post it on Craigslist for you to make it an authenticated screwing, lol. $50 plus shipping. jk

Some of these parts sitting on the shelf 20 years probably need an expiration date. I've bought many items wrapped in yellowed plastic.

[choke]

thanks for the replies
it is a manual, has about 130k miles on it.
we just drove it across country and the car died in georgia and we put a new ignitor in it and that fixed the not running problem.
but it still has the not revving out problem.
if it was the timing belt wouldn't it run rough all the time?
it idles fine and seems to run good up until 4500 rpm.
i have adjusted the timing all over and it does not help.
maybe i should try a new ignitor?
rock auto?

[Chicken]

I can't tell you where to source a reliable sensor/igniter. That is the problem.

[Rocketman]

Have you replaced the fuel filter? A clogged filter may not deliver enough fuel.

Is the catylytic converter intact? Do you feel like getting under the car, and unbolting the front of it to inspect the inside of it? A restricted cat or exhaust will choke the engine.

How does it feel on power otherwise?

[Rocketman]

Does it do the same in neutral as it does on the road? A noisy signal coming from the ignitor might cause issues with spark delivery at the RPMs you mention

[choke]

I changed the fuel filter and that didn't fix it so I'm going to throw another igniter in it. I'll let ya know what happens. Thanks

[choke]

i put a new ignitor in and the car still doesn't rev out.
its the same in neutral as well as in gear.
it is a manual
i replaced the fuel filter also and welded a new cat on when i got the car 4000 miles ago.
i pulled all the plugs and the were all dry and properly gapped
any other ideas?

[choke]

i'm going to try an ignitor from rock auto, hopefully it fixes it. i've tried 2 different ones from auto zone and the car runs but it wont rev past 4500 rpm, it acts like its getting too much fuel or not enough fuel, if i rev it real slow it revs a little higher but if i just dump the throttle it only revs to like 4000 rpm
any other thoughts on what it could be would be greatly appreciated
i'll let you know if the rock auto ignitor works
thanks

[NomakeWan]

It really sounds like electrical. My old Datsun had an issue with going over a certain RPM that ended up being the ignition coil, but you've already been through several ignitors. The plug wires are new and separated and fully seated? The cap and rotor are new?

[choke]

nomakewan thanks for the reply,
yea the plug wires are new and fully seated as well as the cap and rotor.
i've also replaced the ignition coil as well as the internal ignitor.
it runs and drives fine but you just have to shift before the point when it starts to sputter/hesitate

[mitch1204]

Thoughts?? Exhaust restriction like a clogged cat or smashed tailpipe. A dirty or bad MAF will throw one into limp mode but I think this car is too old for that.
Last, the TPS might have a dead spot near the upper end. If you have a needle multimeter ohm it out while turning it. The needle should swing smoothly from one end to the other