Sti Hesitation when cold

xxjack189 · Dec 10, 2013

My STI is hesitating when cold, at low rpm between2-3k it seems pretty random sometimes it will happen frequently sometimes not at all, it always rectifies if i lay of acceleration for a second then go back on it again, and then when the car is warm and im at highish speed 80-100kmh if i hit the accelerator it will hesitate slightly again before it reaqlly takes off, any ideas? bad plugs? coils?

Thanks for your help in advance

Paul555RA · Dec 10, 2013

Could be the maf on the way out are you getting any cel's

xxjack189 · Dec 10, 2013

Nope no CEL's strangely and it happens pretty much every time i drive it so would think it would trigger a CEL. would it be worth getting a diagnostic check without a CEL or?

Paul555RA · Dec 10, 2013

Yeah could be when my maf gave up altogether the car was seriously down on power drinking fuel but yet no cel it only showed up on diagnostics

scoobysub · Dec 10, 2013

when were plugs changed last

xxjack189 · Dec 10, 2013

I only have the car about 2 months, so when the plugs were changed is anybodys guess, i suppose i should start there as it would be the easiest to rule out.

DUFFMAN · Dec 10, 2013

Doesn't sound like a maf is gone,

Sounds like spark to me, change or check plugs and then leads

xxjack189 · Dec 10, 2013

Ok, thanks for that, you wouldnt think its coilpacks then no?

scoobysub · Dec 10, 2013

do a full service oil filters spark plugs and air breather and go from there

xxjack189 · Dec 10, 2013

Well get that done the weekend, thanks a lot for the help

scoobysub · Dec 10, 2013

piece of mind if nothing else you'll know its done.

xxjack189 · Dec 10, 2013

Exactly it certainly wont do any harm anyway.

JAMIE-TYPERV6 · Dec 11, 2013

As above... full service and plugs.

I've found of late on very, very wet, moist mornings that my own is a little hesitant till it gets warm. It appears to be just moisture in engine bay and a damp coil pack/HT lead.

xxjack189 · Dec 12, 2013

Got oil, filter & plugs so will give it a service the weekend and let ye know if it fixes it cheers

xxjack189 · Dec 19, 2013

Quick update on this, changed all the plugs, cleaed the MAF & still hesitating, any other ideas? :icon_sad:

keith dublin · Dec 19, 2013

Coil pack or maf :dontknow:

Best thing would be to get in to a trader on here and let them have a look

Paul555RA · Dec 19, 2013

Cleaning the maf doesn't always work id say needs a diagnostic

scoobycolm · Dec 19, 2013

I thought I read before you shouldn't clean these mafs :dontknow:

ianfl · Dec 19, 2013

What year sti

gonzogicker · Dec 19, 2013

[quote author=ianfl link=topic=39989.msg456500#msg456500 date=1387479827]
What year sti
[/quote]

Bugeye i think?

Sti Hesitation when cold

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