Hi folks

I have been having probs with my classic wrx and its running. It hesitates under low revs and its now getting me down
Its been doing it for around a month and so far a couple of cracked coil packs have been changed, new gasket for idle control valve and cleaned and today I changed the cracked knock sensor. But today it seems to be worse and hesitates under slight acceleration when going up the gears. Also had a look and couldn't see any splits or anything.
I am at the stage where god knows what else it could be and I'm thinking or taking it off the road and stripping it for spares

Oh and the idle revs seem to be quite low. Around 200-400 revs it seems.

Any helpful ideas would be appreciated please!

Thanks in advance

 

I'm suffering similar, I describe mine as a stuttering as the turbo is spooling, sort of between 2000-2800rpm. Once its on full boost it pulls fine. Mine ticks over at about 500rpm when warm.

I'm going to change my knock sensor, then resort to swapping the MAF and see where I'm at

 

Maf ?
Boost leak ?
Plugs ?

 

Had this prob with my Audi A4 1.8t turned out to be chain tensioner if that helps
I had changed coil packs,plugs,and sensors and it was still the same had to send it to audi £600 for new tensioner

The spring in the tensioner fails causing a lack of oil pressure this in turn makes the chain slack and knocks timing out causing car to tick over low revs stutter misfire etc

 

I forgot to add maf was changed and plugs were changed about 2 months ago when it had a service And it don't do it under boost only on low revs.

If its going to be something expensive then its gonna be broke for bits as I'm not wasting anymore money on it. Its already cost me thousands in under 2 years (since I got it)

 

Mine did this, mostly at cold. Changed so many parts, turned out to be a warped block and head.

 

have a look at your fuel pump. Then have a look at your map sensor.

Could you post a pic of engine bay so we can have a look a your pipe routing?

The most common problem I have seen is a turbosmart boost adjuster if you have one fitted?

 

have tou tried cleaning the boost solenoid valve?

 

Cheers mate lol

I have no extra boost adjuster and a standard dv which has also been changed recently.

What and where is that bit?

Spoke to Tim Farmer today and I am going to try the old maff trick or disconnecting it while running and cleaning the top of the idle control valve. See if these do something

 

Maf trick is just that , a trick and isnt a true indicator of any fault. The boost sol is located on the drivers side suspension turret and is brown in colour witn 2 pipes coming from it. If its faulty it would show up and cause these symptoms. It can be cleaned out by flushing through with cleaner and then lubed up. Theres a guide to doing it in the Technical Archive section.

 

Forgot to add to check cam and crank sensors.My turbo has run better since changing and not that costly to do .

 

I know what you mean now. I have a 3 port boost solenoid but not checked that atm. Done the maff test today and unplugged it while car was running and it dies, so that's OK Also cleaned the top of the idle control valve today, not dirty tbh but cleaned anyway. Car still messing about, but not as much. The main bit of hesitation is when pulling away or changing up gears with little throttle, feels like its got kangaroo p155 in the tank.
Now waiting on our Mr Farmer to send me a pic of a hose that is prone to cook and split apparently. Can't remember what one it was now though

 

Hose looked fine when checked and cleaned out the boost solenoid today. Car still the same
I really don't know what it could be, but thinking its something pretty trivial as it don't do it all the time and only does it at low revs

 

Hi . Did you sort this problem out?

 

i had similar probs and found a small crack on the turbo elbow and the jubilee clip was hiding it until i took it right off, mine kept hesitating in low gears but ok on boost etc so worth a check.

 

I'm having the same problem with my bug it's doing my head in now

 

Nope Still bugging me.

Its done my head in and now looking for a cheap run around as I think the car is going to be broken for spares. Shame as I would of liked to of found out what has been knobbing me off for a while

Cheers matthewn, I may have a look if I can give it any more time

 

Going to check the pipe work again See if anything is leaking. Might just buy another intake pipe from the maff to the turbo I think it was. Where the breather pipes attach which is a 90% bend. Not sure where I can get one as I'm not paying stupid money for a Samco one

Any ideas folks?

Ta

 

i changed mine mate got one from first.racing on ebay, was about 25 quid then done away with the breather pipes by fitting a oil catch can as it dose not have the inputs for the breather pipes but was going to fit a catch can anyway so two birds with one stone as they say. think i got 65mm reduced to 60mm mate.

 

Wasn't planning on catch can, just a standard pipe tbh or a silicon to match the standard pipe. Not wasting any more money on it if I can help it

 

Standard replacement or Samco is the only way forward then Glen. Catch can and sundries is cheaper than the Samco.

Check all your vacuum pipes whilst you're on mate.

 

I know Samco is expensive which is why its not a contender, so standard is what I'm looking for, unless I can get all the bits for a catch can etc for around £40 lol

 

Throttle body cleaned out?

 

Where about's is that positioned Kevo?

 

Catch can - £55
Cheap breather pipes to catch can £10
Reducing elbow £15 ish

Actually, just that's getting close to the Samco price, and you'd still need to buy a couple of more bits.....

It all adds up.

Throttle body is bolted to the inlet manifold, your intercooler connects to it.

 

Can get catch can kit for £25 and then buy some extra hose, but what about my recirc dv? So would still need to replace the intake pipe. No point in spending extra for something not really needed

Sorry which bit on here do you mean for the throttle body? Ta


This is one of my old Impreza's and not the current one, but pretty much the same

 

Think I know what the throttle body is now
I found a split in the pipe where the dv fits in on the intake pipe. Would this cause the running issues or just not help it?

 

That would cause issues.

A while back I was trying to trouble shoot an annoying whistle, whilst on boost.

To rule it out, I removed the recirc and blocked the outlet on the FMIC, and the inlet on turbo inlet pipe. I'd left the highlighted vac pipe with nothing blocking it, though.

Very old pic.



It ran, of a fashion. Obviously it was sucking in un-metered air off boost, and pissing it out on boost.

 

Mine, Glen.



You would just tee your recirc into the black which is almost central in the pic, mate. It's the feed that the Idle Control Valve takes air from.

 

This is my car now with the new bit I need in the red box
Took it for a run today after I sealed the crack and its still running crap