Hartyboy

When i get on boost its like the car is holding back and misfiring ok when i let of the gas though, changed the plugs and all the tips were brown/white but dry

Changed the dizzy cap and arm too!!!

Any ideas?????

Physio

Check your turbo hoses (intercooler etc) make sure there not soft.

Hartyboy

boost leaking you mean!!!

s1rscustom

i had same problem holdin back was still boostin but not right i changed metering unit and was perfect see if can borrow one or get a cheap one my was poppin and bangin,

Hartyboy

Did pop and bang a bit!!!

but only happens when turbo kicks in

Hartyboy

What about the throttle position sensor

Physio

No mate, check to see if there really soft & can be squeezed easily because if thats the case whats happening is that when the boost comes in the hoses are being sucked closed hence cutting off the boost.

Hartyboy

Seems more like to me that theres not enough fuel there but they are standard hoses so i'll check

AKRS1

is it chipped

ldack

After doin headgasket, got myne running and if you put your foot to the floor it badly miss-fired. \but was ok if you let the boost slowly build up.

I tried coil, cap, and leads - had new plugs in from when i did h/gasket. Fault was the plugs though, standard plugs wern't good enough and it was blowing out the spark. Also the gap wasn't right, so got some NGK's and set the gap properly and now all ok!

Hartyboy

It is chipped but i dont know what sort of chip!!

Just fitted new standard plugs and gapped at 0.75.

Hartyboy

Felt the bottom boost hoses fook are they soft and half closed too badly fitted they are standard and very oilly
Better get some new ones

hybrid t3

if its running more boost standard plugs with standard gap may have trouble with extra boost blowing spark out. thats why it only happens on boost.

Hartyboy

Its only running 9psi

Hatch

could be solenoid control valve m8

Hartyboy

Which is what/where???

Hatch

the round valve above the gearbox with 3 pipes attached ....clicks when you turn ignition on

Hartyboy

amal valve? i aint got one of them only a bleed valve

Hartyboy

Changed Hoses and removed dump valve but its still doing it!!!

Its like machine gun fire from the exhaust when its on full boost but when i back off its ok doesnt happen so much in 1st and 2nd???

SPADGE

At what rpm is this happening?

S2martin

does it still do it if you try and gently press the throttle throught the rev range like as it comes on boost if flooring it it was like hitting a brick wall with missing and shit?


anyway i had the same sort of problem and it turned out to be a knackered chip as mine was chipped but it turned out to be fucked chip and a new one stopped all the fugging about







Martin

Hartyboy

3k and above

Hartyboy

if i do it slowly its ok as long as i dont full boost it

FletchCossie

iTrader: (4)

What PSI boost does it hit when your on full boost mate? If it does it around 14psi then you may have a boost limit.

Have you had the timing checked?

Hartyboy

its only set to 9psi its just when i open the throttle fully it does it!!! Timing hasnt been checked recently.

Nick @ M Developments

Could be the map sensor in the ecu, blew mine recently and it backfired and stuttered after 2-3k,hope u get sorted

Hartyboy

Is that easy to replace or fix???

Alan s1

hi m8 my mates s2 was doing this when some one played around with the idael screw it had been wound out to mush so there was to much air set it to whot mine was and it was running as good as new

worth trying it m8 try turning it half a turn at a time and she how you get on

blaazer2

have you checked the cam timing ,as on the bottom pulley there is a groove you dont use that ,could be map sensor or fuel pressure related,does your car run hot?

Hartyboy

Nah car runs quite cold really
Gonna try changing fuel pump and filter

matt500

It sounds to me as though the spark is getting blown out! I would get some Champion QC59YC fast road plugs as these are designed to cope with slightly uprated boost and the standard NGK BCR8ES arn't. It is also very important that the plugs are gapped correctly aswell!

Matt

matt500

Also another thing check your HT Leads they may be well worn if they are still the original ones! The ones to go for if you were thinking of changing them would be the Magnecor R-100 10mm leads as these really are the dogs dangalies and come with a life time guarantee!

Matt

Hartyboy

Ive just fitted standard plugs gapped at 0.75 and the leads are fairly new magnecors but are 8mm!!!

matt500

Does this happen in all the gears when you are driving or just in 4th and 5th?

Matt

Hartyboy

All gears but not so bad in 1st and 2nd!!!

The Sludge

Harty i got exactly the same problem. It only happened since fitting new turbo last week. Does it sound tappety as well? I have been told a few things

1. timing
2. air leak
3. plus
4. cam seal

Let me know if you solve it. The guy who did me engine th eother week (low comp) he is coming tomorrow to have a look so if he solves my prob i will let you know dude

S1 JOHN

me and 1 of my mates have just had the exact same problem both got brand new ngk copper core plugs boost comes in sounds like a tank hence throw them away and ring motorsport developments for a good set of motorcraft ones i think they are only 15 quid a set

matt500

It could be the air charge temp sensor playing up

The Sludge

starts ok tho matt, althought i have notived the clipis broken and doesnt quite sit right

Hartyboy

it only seems to happen on boost???