Rough running engine!!! Not sure what is wrong! Please help.

[lyonswm]

Hello, I have a 90 1g and today the engine began to run very rough at the low rpms. It was driving just fine then i stopped got some food and when i started the engine it was running rough and the check engine light came on. When I drive it at low rpms the engine is rough but at high rpms it is fine. I have checked the spark plugs and nothing seems to be wrong. From the exhaust i can here a little ticking noise not sure what that is. I have talked to some people I know that are pretty good with cars but even they don't know what to say about it. If anyone has had a similar problem i could use some help.

 

[steve]

If the CEL is on the first step is to read the code and see what the ECU is telling you is wrong.

http://www.dsmtuners.com/forums/articles-tuning-ecu/319844-1g-code-reader-cel-code-reader.html
http://www.dsmtuners.com/forums/art...out-scantool-cel-testing-1g-turbo-models.html

 

[Kod]

That could be a number of things.. MAF, MAP, TPS.

 

[Teyrnon]

The first thing I would check, that seems to get overlooked a lot in the automotive world, is for any sort of vacuum leak.

 

[lyonswm]

I disconnected my battery and left it for about 5 min and then reconnected then the check engine light went away and the car ran fine. I thought i may have fixed the problem but it turns out after a few drives it came back on and the engine began to run roughly. So i bought an analog voltmeter and tested to see what sensor was going off. I came out with code 23 and i have seen multiple things that code 23 is. Does anyone know for sure what that code means? I have a 90 eclipse so if anyone knows that would be great help.

 

[5150DSM]

Code 23 is camshaft position sensor. You can check pins 21 and 109 for continuity between the ecu and the cam sensor.

 

[laser5spdturbo]

CAS sensor . I had a couple act up then die on me .

 

[lyonswm]

How do i replace that sensor? Is it an easy process? Also does anyone know any links that i could look up that would help me replace this sensor. I believe it is just the sensor because when i unhook the battery then connect it back the car runs normally. Thank you for the help