[Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Anything and everything to do with mechanical issues with your Mk2

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Zeppozen
Posts: 166
Joined: Sun Feb 22, 2009 7:40 pm

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by Zeppozen »

Have same problem with my 1991 rev 1 n/a.

Replaced all the plugs, leads, dizzy cap, rotor, coil after a night of heavy rain caused car to die. HT leads lit up like Frankenstiens laboratory.

on damp mornings it starts but still dies at 2000 - 3000 on load ( high gear or hill). But is not so pronounced. So obviously problem still in there somewhere.
After a short stop. the problem goes away. Its fine on sunny dry days.

I was told when my MR2 MK1 did this that moisture builds up in the spark plug tubes and it arcs around in there. Hence when car sits the heat evaporates all moisture in there.

Try spraying WD40 stuff into tubes (under the plug lead caps ) to see if that makes any difference before setting off.

Did it with my MK2 when the b1tch would not start after sitting for 2 days in damp. This seemed to make a difference.

Just a thought.

As its damp ( humidity ) related I am tending to diagnose on an electrical basis.

Odd thing is it clears when I floor pedal ?
Zeppozen
Posts: 166
Joined: Sun Feb 22, 2009 7:40 pm

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by Zeppozen »

Just reminds me of a problem on american car.

Guy goes to the ice cream store every day and buys vanilla ice cream. Car starts fine.

On the days when he buys chocolate ice cream the car refuses to start.

Mechanics , everyone baffled as to why chocolate ice cream should be cause of problem.

Turns out that the chocolate ice cream is kept at the VERY back of the store. This means it takes longer for the guy to get the ice cream.
Hence
The car sits for longer causing fuel evaporation , causing the car not to start.
Bone
Posts: 298
Joined: Sun Jun 28, 2009 7:59 pm

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by Bone »

Bone wrote:Funny you should say that as I've just swapped my ngk king lead for my old standard one and the cars running a lot better. I'll have to see how it goes :D
All was well until today, she started playing up on the way home from work. :(
Zeppozen
Posts: 166
Joined: Sun Feb 22, 2009 7:40 pm

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by Zeppozen »

Not sure if it was on this forum or another, but someone mentioned that the seal on the king lead to the coil can be poor.

What happens is the current will take the shortest route to earth and if there is a poor seal on the coil end it will arc along the coil to the mounting bracket / bulkhead.

So perhaps there was a problem , replacement fixed it and now arcing again? it can be vasalined ( or silicone sealed I did mine ).

try to see if its arcing in the dark :-k not easy but mirrors etc might work.

just a thought as it seemed to work for a while.
djpkins
Posts: 2326
Joined: Thu Apr 30, 2009 7:13 am
Location: essex

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by djpkins »

Thats not a bad idea matey....what dizzy cap have you got....mine's from a porche can't say that there's any difference from the oem one...these cars eat dizzy caps for breakfast...I'm gonna copper tab my spare one..my mate John had one and it was the b0ll0x...better spark and last for a lot lot longer...
mrdb
Posts: 169
Joined: Mon Apr 30, 2007 11:00 am

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by mrdb »

ok this may help someone.

Mine had this for months and ive finally tracked it down.

I had a downpipe manifold leak on cold start 1 stud was loose on downpipe. I tightened it up and its cured it by about 99% only very occasionally does it do it now and than it clears almost instantly. being loose its also caused a small crack to form just infront of o2 sensor boss which im welding up asap which i guess is causing the occasional problem now.

Im 100% sure that was the cause of the misfire.. O2 sensor would add fuel thinking running lean as sucking air into exhaust just infront of it. This is most prominent just as boost starts to come in on most cars thats about 2500 -3000rpm...

Mine also misfired real bad on tight right hand bends, this was because the down pipe would lever off increasing the gap between manifold and turbo..

Im a happy bunny now.... lol
Bone
Posts: 298
Joined: Sun Jun 28, 2009 7:59 pm

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by Bone »

Funny you should say that as I've got a small leak when cold. Still got the problem. I'll order a genuine gasket. :thumleft: :thumleft:
djpkins
Posts: 2326
Joined: Thu Apr 30, 2009 7:13 am
Location: essex

Re: [Mk2] [Turbo] Spluttering in the morning then clears up? Any ideas?

Post by djpkins »

get it welded asap mate..it wont take long for the crack to run...i had a spiderweb like series of cracks running around my dp...and like you it manifested itself as a misfire, guess the cracks open up more when on boost and it's hot.
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