steveman

i own a 93 wrx with scooby sport exhaust itg filter.
the car sounds great but holds back regularly. it feels like a xr3i not an impreza.dose any one have any sugestions.

tweenierob

You need to install a boost gauge mate.
This can give lots of info..
If you have boost readings then it makes it a lot easier to help ya..

Rob

MAFFA

When you say "holds back" is that like it's hesitating? If so it could be your sparkplugs, coilpacks, boost solenoid or MAF sensor.

Easiest to do are the later two if you've got a can of brake cleaner

If it's not them then it may be one of the others. Are your plugs gapped to 0.7mm? Have you tested your coils? I think there's a thread on it somewhere?

MAFFA

steveman

thanks lads ithink im going to put it on a rolling road its just been surviced and put on subaru computers they say nothing wrong.

crossy

I have the same problem on mine..goes really well when the air temp is cold but on a warm day does not rev as easy. I have changed all four coil packs, but car still ran the same. So I'm having the mass airflow sensor changed tomorrow, I will get back to you with the results.

stubee doo

i had the same problem and i have just got a diagnosis that it was the coils so all four have been replaced and its now a flying machine

davidmartin861

"I have the same problem on mine..goes really well when the air temp is cold but on a warm day does not rev as easy. I have changed all four coil packs."

My car had the same problem.

Which part of the car is the coil packs ?.

Best Regards

IanW

The coil packs sit on top of each of the spark plugs.

sparkster

I too own a 93 wrx.
Tried that Nitrox Hot Shot octane booster. It supposidly cleans the fuel sytem and lubricates working parts. Having an old car, i thought this would be worth a try. Holy s***

I normally just use optimax. I put a bottle of this stuff in and once ide gone through about a quarter of a tank, i couldnt believe the difference. The car feels more powerful and the throttle response is so much sharper. Unbelievable!!! Maybe my fuel system was in a real state before i did this. Give it a shot.

steveman

this going better on a cold day ive also noticed early in the morning on a frosty day its like a differnt car .im also thinking of water injecters..