Steve Scooby

please help changed spark plugs ,changed coil packs cleaned air flow meter and boost solonoid still hesitating when you boot it
somtimes drives ok
sometimes hesitates at 0.5 bar
sometimes at 0.8 bar
no fault codes showing
starting to get expensive please help


steve scooby

james-wrx

[QUOTE=Steve Scooby;6918799]please help changed spark plugs ,changed coil packs cleaned air flow meter and boost solonoid still hesitating when you boot it
somtimes drives ok
sometimes hesitates at 0.5 bar
sometimes at 0.8 bar
no fault codes showing
starting to get expensive please help

I have similar problem, havent cleaned the MAF though, have you tried replacing it?

amego

had that prob once was faulty ignition switch

Steve Scooby

[QUOTE=james-wrx;6918819]no not yet

Steve Scooby

no not yet

Steve Scooby

never thought of ignition switch how do u check it and is it cheap to replace

TonyBurns

iTrader: (3)

Is it just in one gear this happens? and what model/Model year is your car?

Tony

Steve Scooby

does it in 2,3,4,5
model wrx k reg 93
sometimes runs fine though

TonyBurns

iTrader: (3)

What fuel are you using?

Tony

Steve Scooby

only runs on optimax/ v power

TonyBurns

iTrader: (3)

It could be a bad batch of fuel, have you tried another garage or added octane booster to see if there is any difference?

Tony

amego

came up on faultcode local garage replaced the wiring onit

Steve Scooby

tried different garages and booster

problem been going on for months
should i try another boost solonoid
new ones cost 180 quid though

Steve Scooby

no fault codes coming up

dan83590

Have you gapped the plugs corrctly?

Steve Scooby

got pfr6b plugs from roger clark motorsport
thought they were already set

dan83590

No.. From the box they are set at about 1.0mm. Take them out and set them at 0.7-0.8mm

This will help. https://www.scoobynet.com/general-te...?highlight=gap

Key in the word 'GAP' in the search to find loads more. The subaru turbo must have the correct spark gap. Try this first then post back.

Sc0oby

have an same problem before with a client found out to be a faulty map this is on a 2003 jdm sti

robsw

I brought some PFR6B's off ebay, they all came gapped at exactly 0.7mm. Worth checking though, as if yours are gapped at 1.0mm then that could be the problem as dan says.

Steve Scooby

cheers for that will give it a go when got some time i will let u know

dan83590

Deffo check. The 7B's I bought were gapped at 1mm straight from the box..

Steve Scooby

phoned roger clarks asked about gaps on pfr6b saidthere were set ready to go

dan83590

Up to you matey. I'd double check them before I went spending sh!te loads of cash when you may not need to. My NGK's were without a doubt set way bigger than 0.7mm. Until you know what the gaps are for definate you may as well p!ss in high winds. What we know so far is that you have change various items and the problem is still there. You need to start ruling things out and you cannot rule out plugs if you have not gapped them. Who knows, you might get lucky.

Up to you matey int it!

Steve Scooby

worth checking will do let u know

Steve Scooby

checked gaps all about 0.7
could knock sensor have anything to do with hesitation

dan83590

Next thing to check is the coil packs. Have you had new ones fitted or were they second hand?

Just a thought, was the timing belt changed just before this problem started?

codfather

iTrader: (1)

just to second the coil pack issue..wen you checked them did you try pulling the rubber boots off..i had one which looked fine until i did this and it crumbled away in my hands

Steve Scooby

i put new new plugs in and replaced 1 coil pack still hesitating so i then changed all 4 coil packs still hesitating phoned roger clarks they said by only changing 1 coil pack at start might have damaged new plugs they said u might have to replace plugs again did so .Running ok now.
only time will tell though as problem comes and goes
let u know if hesitation comes back

cheers lads for help ps any body know where nearest rolling road is in cleveland area and how much do they cost