intermittent misfire after remapped ecu?

[azzsmith]

Hi all, my car is set up for stage 2 and I bought an already mapped ecu from someone and had it coded in today.
All is fine at idle and it is definately quite a bit faster but under harsh acceleration there is a missfire, it goes all judery and sometimes pops and holds back?

Contemplating whether or not to change coil pack but was just wondering if anyone ever had anything similar?
Cheers, aaron.

[dom]

So you've bought a pre-mapped "stage 2" ecu? That's your problem right there! A proper stage 2 map should be done on a rolling road so it can be customised to your car/mods.

[azzsmith]

What do you mean thats the problem?
The bloke that coded the ecu (works for revo) said that after mapped ecu went in all four spark plugs sooted up so he changed them but apart from that he said that everything else was working really well?

[dom]

What do you mean thats the problem?
The bloke that coded the ecu (works for revo) said that after mapped ecu went in all four spark plugs sooted up so he changed them but apart from that he said that everything else was working really well?

I mean that a "Stage 2" map should be unique to your car and your mods, for this to be done correctly it should be done on a RR. In your case this has not happened.

Who mapped the ECU? Was it removed from another car? If so what mods were they running? Are your mods identical?

[azzsmith]

The ecu was mapped by jabbsports and removed from another agu golf... All mods are the same apart from fpr. Mine has 3bar and the other car had 4bar. The bloke from revo took some logs and said that the fuel in and out was spot on.

[azzsmith]

Also should I change all four or just find the one that is failing if it is the coil pack?

[Rhyso]

Missifre on an AGU is normally the ignition amplifier on the back of the airbox

[dom]

The ecu was mapped by jabbsports and removed from another agu golf... All mods are the same apart from fpr. Mine has 3bar and the other car had 4bar. The bloke from revo took some logs and said that the fuel in and out was spot on.

Fair enough, probably not the map then!

[azzsmith]

Thanks mate, do you know roughly how much from vw for ignition amp and would that cause a miss under load only?

Cheers

[topher]

you can't check fuelling properly on an AGU by taking vagcom logs, you need an external wideband. It could be leaning out which i've seen many times and can cause the symptoms you describe, usually down to a weak fuel pump. It could be the ignition amp.. but i'd get the fuel and boost logged properly on a dyno before you go spending money on parts.