Hi guys,

So I have a '94 JDM Impreza STI, which does some weird stuff. It usually runs fine, but once in a while (most notably while driving on rough roads, but can happen while driving down a hill for example), the check engine light will come on (it will stay lit up, it doesn't blink) and the car will start shaking a little bit. If I slow down / stop or turn the car off, it will be gone and the car will be back to normal (no shaking, no check engine light). When this happens, there are no noticeable sounds coming from the car, the only thing I can notice is the shakiness (can be felt through the seat) and that it can be a bit jerky when driving in the first gear.

Any ideas? It's kind of hard to check something because once I stop the car, I can't check the engine bay since all will be back to normal. I've also noticed, that this won't happen right away when the car isn't warmed up. The issue comes up when the car has warmed up (no overheating though).

Could this be something as simple as spark plugs for example? I've also heard, that the knock sensor might be coming in when this problem comes up (but not sure whether it's actually preventing engine knock, or if the sensor is bad).

I'm afraid I don't have a chance to check the engine codes at the moment, but any help is greatly appreciated

Thank you!

 

read the error code, easier then warming up the Crystal Ball . .

 

^^^this
Takes less than 10mins to check!

 

sounds like a bad electrical connection somewhere

 

Or a failing sensor.....

 

Or . . . . anything till we get the code lol

http://uk.subaruownersclub.com/forum...ing-ecu-codes/

if it helps.

 

Thanks for the answers!

Yeah, I'm afraid I don't have a chance to read the codes at the moment, but will have to try that once the chance comes up

 

Look for an ELM327 bluetooth obd2 scanner. They're cheap and let you read codes via a smartphone.

 

Doesn't have OBD2
Just use the built in diag on a GC8

 

OBD didnt even start in cars until 1995.