Hesitant on WOT

[Rusty]

They are an upgrade on totally knackered OE coils with cracked and brittle wiring

Andy, I hope you get this sorted, as your setup should be very enjoyable, as me and Rustynut can confirm

[andyg plym]

They are not causing any misfire problems

[UrS4boy]

They are not causing any misfire problems

And just how do you know that at WOT?

[andyg plym]

It's 1-3 the issues are not when it's fully under load, I've had enough misfires in my time to know that this isn't one. It's hesitant, I should have mentioned it happens more when fully warm.it will hold full boost all day long 4-6.
The coils and harness are brand new last week, the coils and harness that I borrowed were exactly the same.
I'm running a 1.7 bar boost setup, I've read many posts how these are good for over 500?

[Rusty]

Have you done the lambda test yet?

[andyg plym]

Unplugging it ? Not the new one didn't see any point as I'd tried it before on the old one

[UrS4boy]

Unplugging it ? Not the new one didn't see any point as I'd tried it before on the old one

Your response to the suggestions being offered to you is bound to lead to successful resolution of your problem.

[Rusty]

Stop messing and unplug it

[andyg plym]

Your response to the suggestions being offered to you is bound to lead to successful resolution of your problem.

What am I missing here ? If I've already had a lambda unplugged and it was no good then why would I do it again ? It struggled to idle last time

[newsh]

The ECU will have adapted since.

[andyg plym]

I have pulled the motor fuses out when installing the new lambda, it's no problem I can disconnect it just to see either way

[newsh]

So it's hesitating at WOT but only in gears 1, 2 and 3. Load is more in the higher gears so a misfire would be more likely to show there.

But what is a hesitation if not a misfire of some kind? Is it the knock control pulling timing?

Is ISV clean and operating nicely? That's the normal cause of lumpy idle and start up strangeness, that and the dirty MAF connector syndrome, in fact have you cleaned the MAF connector pins properly yet?

If it was hesitating coming back on throttle I think I'd be looking for a small boost leak.

Have you still got a stock ECU you could try?

Am I right in saying the ECU ignores the Lambda at WOT anyway? At part throttle it adapts so can compensate for leaks and worn components but at WOT it runs on the full throttle map. I think that's right.

[UrS4boy]

Am I right in saying the ECU ignores the Lambda at WOT anyway? At part throttle it adapts so can compensate for leaks and worn components but at WOT it runs on the full throttle map. I think that's right.

I believe 99.9% that that is correct. Prj or Paul N. to confirm 100%.

[andyg plym]

Just been out and tried it with the lambda disconnected and it's even worse.
Very lumpy idle and still hesitates as before

[S2central.net]

Yes - when load level (air mass) increases above a certain point (rpm related) then the ECU controls injection purely from the fuel map (with compensation for temperatures etc) and it stops trying to modulate mixture around the nominal AFR of 14.7