1G NA 4G63 Engine won't rev over 3.5k

[Micah21]

I have a 1g 1992 eagle talon fwd it has a 4g63 non turbo standard and I cant get my rpms over about 3500. I've already replaced the fuel pump, maf sensor, tps, and sparkplugs. Any information on what could be wrong would be greatly appreciated

 

[steve]

3.5K RPM's when? Standing still, going uphill, going down Pikes Peak?
Is is breaking up or just seem to run out of steam?
What's your compression, how many miles, any codes?

 

[Micah21]

When I'm driving it. It will start sputtering and jumping at about 3500. Theres almost 200,000 on it and the check engine light is on but I'm not sure what type of code reader it takes or where it is to check it.

 

[Jk's97DSM]

You need to search on here on how to get the codes. It’s simple.

It sounds like ignition but again you need to get the codes.

 

[Micah21]

I did look for the code reader on here but what I got was wrong or at least not accurate

 

[97egl]

Here is how to get your codes. No reader required

https://www.dsmtuners.com/threads/1g-code-reader-cel-code-reader.319844/

 

[Micah21]

Ok thank you I'll try that out.

 

[pauleyman]

Start with a profile.
Did you just get this car?
Was it running correctly?
Did you make any changes or repairs?
Does it idle?
Lastly please stop throwing parts at it. Its expensive and not necessary. Diagnose the root cause. We will help you. Start with the code.

 

[Micah21]

I got the car about August last year and it ran fine for a little bit I think it wouldnt go over 4000 rpms and it has an idle surge then one day it lost power. I was looking things up trying to diagnose it with some people I know and tryed that but it didn't work. The only things I replaced is what i said in my original post.

 

[Vegas Smith]

Start what a boost leak test and checking if idle position switch is connected.

 

[92AWDHX40]

Man the days of palm pilot pilot forgot that can pull codes.

 

[97egl]

Start what a boost leak test and checking if idle position switch is connected.

He's NA. I would suspect ignition parts if I was just guessing but hopefully he will be able to pull the codes and we can be a lot more help with those.

 

[Vegas Smith]

He's NA. I would suspect ignition parts if I was just guessing but hopefully he will be able to pull the codes and we can be a lot more help with those.

Whoops, forgot about the NA part.

 

[Kryndon]

RPMs capped at 3.5k is indicative of the engine being in limp home mode. Usually the most common triggers for this are: Bad crankshaft position sensor or a bad camshaft position sensor. I strongly suggest looking at those two first. From personal experience, I have had both go bad and put my car in that state.

 

[Micah21]

Thank you but this is no longer relevant as my transmission is broken. However if anyone knows where I can get a fairly cheap tranny I would appreciate the input