when i take my sti up to 4500 revs she starts stuttering like a rev limiter is on it any ideas does in all gears

 

Can you rev above 4500 and does the CEL come on?

 

not in gear and no light comes on

 

I am not an expert but if it happened to me i would clean out the boost solenoid, check all its pipework and check the coil packs for a start.

 

Is it misfiring?

 

no runs sweet till 4500 then starts stuttering boosts fine too

 

Does your check engine lamp come on when you switch on the ign without starting the car?

 

yeah it does

 

Ok, was just wondering incase you were in limp home mode & the check engine lamp wasn't working.

How old is the car?

Does it only happen on boost/hard acceleration, or can you drive through the 4500 pm mark if you use a light throttle opening?

 

speedo working?

 

96 and even when just slowly accelerating it will do it

 

what sponners asked

 

does it rev past 4500rmp out of gear??

 

Hmmm, Thats both interesting & unusual.

So you can't get the car to drive through 4500 at all, but you CAN get it to rev cleanly through that point if you take it out of gear?

Have you carried out any work on the car prior to the fault?

Was it driving perfectly ok one day & faulty the next or has it slowly been getting worse?

 

Mine did this once. I reset the ecu and its been fine since. May not be the case on yours but its worth a go.

 

speedo has stopped working actually

 

Well there you go, that's your answer.

The engine ECU needs a speed signal from the Speedo. If that fails then it puts the car into limp home mode (restricted revs & boost).

When you get your speedo working again, the car will drive normally.

 

^^^