erractic idling Subaru Impreza

Midlife":2ngvmv9b said:

Just curious Graham, Where do you work ?

Shaun

Click to expand...

Dub90":1rlbeb7p said:

Yip....

Click to expand...

Dub90":2l7lg8tb said:

as mentioned above, try all the simple things first like plugs/leads and coil. it should have a central coil, top of the inlet manifold. These do come up at scrapers so may get some bits there, early Forester may have the same engine components depending on your model year.

early non turbo engine didn't have a MAF sensor ( fits between ail filter housing and the engine) O2 sensors normally bring the light on before causing erratic idle. Remove idle air control valve and clean it with some sort of carb cleaner.

what you are describing sounds like your knock sensor ( top of the engine underneath the inlet manifold) has a single bolt going through it with a connector 6" off the back of it ( depending on which one you have)

however i would conclude that you really should get some proper technical assistance as i can offer you all sorts of pearls of wisdom and spends 000's of your pounds and be no further forward.

get a local friendly mechanic to cover all the basics ( including air leaks on the air intake side) as he may spot something simple and cheap.

Graham
(10 years experience as a Subaru workshop manager)

Click to expand...

Harryburgundy":3erpjr0t said:

Dub90":3erpjr0t said:

as mentioned above, try all the simple things first like plugs/leads and coil. it should have a central coil, top of the inlet manifold. These do come up at scrapers so may get some bits there, early Forester may have the same engine components depending on your model year.

early non turbo engine didn't have a MAF sensor ( fits between ail filter housing and the engine) O2 sensors normally bring the light on before causing erratic idle. Remove idle air control valve and clean it with some sort of carb cleaner.

what you are describing sounds like your knock sensor ( top of the engine underneath the inlet manifold) has a single bolt going through it with a connector 6" off the back of it ( depending on which one you have)

however i would conclude that you really should get some proper technical assistance as i can offer you all sorts of pearls of wisdom and spends 000's of your pounds and be no further forward.

get a local friendly mechanic to cover all the basics ( including air leaks on the air intake side) as he may spot something simple and cheap.

Graham
(10 years experience as a Subaru workshop manager)

Click to expand...

Well, I have cleaned the MAF and throttle valve which had some gum, but not much. Used Forte engine/injector cleaner and the engine does run better but the fault is still here.

Graham, I didn't remove the idle control valve as I think someone mentioned somewhere that I should have a new gasket before removing.

I have read the early lambda motors do not necessarily have fault codes, so this could be it along with knock sensor as you mentioned.

I should take it to a garage but properly skint at the moment, and learning your way around is fun (not)

Click to expand...

Midlife":3md7fmy7 said:

For a Moment I thought you were Graham from TSL in Derby

I have used quite a few Subaru Specialists / Dealers from Roger Clark Motorsport,AS Performance, Revolution etc to my local Subaru dealer Stan Palmer (Rob84 on Scoobynet) here in Carlisle and had a whale of a time

Shaun

Click to expand...