Weird Idle Problem

[Kenna802]

I had an issue where when I was cruising for some distance my tune was running rich and fouling plugs. Around town was fine but any highway use it was playing up next day on cold start. I backed the map off only slightly on that fuel cell and it has fixed the problem. Just thought i would mention that sounds it could be the same

[Rolls]

Definitely a possibility, if I was to pull the plugs after a failed idle when I start it how could I tell if they are fouled easily?

Actually the only times the car idled well was when we first put the injectors in, then it went to shit, and then I changed the plugs before the tune and it was shit after that, then came good for a week then went shit again.

Maybe they have just fouled up badly.

Edited June 7, 2012 by Rolls

[DVS JEZ]

Is ur fuel pressure stable? Ie has the pump been rewired to battery voltage?

Is 02 feedback enabled?

If u have the software or consult keep a close eye on inj duty when idle is good and when idle is playing up. Let me know the readings

[Rolls]

Fuel pump is new and rewired to battery voltage, O2 feedback is enabled as well, just need to borrow a laptop so I can run consult again.

Does anyone know what the "Fuel Dumper" is? as I did not get this part when I bought my fuel rail, is it a dampener of some sort? Perhaps this could be my issue.

[GTSBoy]

Yes, damper, not dumper. Basically a passive device, unlikely to cause any problems.

[Rolls]

Seems like a misfire when cold, cannot figure out why though, really need to get a wideband in the exhaust to see if it is going lean/rich or if it is super rich at idle fouling the plugs.

Bummer because I have neither a wideband, nor a nistune license.

[GTSBoy]

What the hell you doing out of bed at this time of night?

[Rolls]

right back at you

im a night owl, I went out tonight, then I came home, sobered up, and did a few hours of work as Im not tired for some odd reason, it is a public holiday tomorrow and I have zero things to do.

[GTSBoy]

I have a completely normal excuse. I'm in the sphincter of the universe, having flown in from the UK this morning. When I posted it was only about 9PM here.

[GTSBoy]

Hey, that's awesome. The country I am in cannot be typed in spelled correctly, because it gets replaced with what you see in my post above. Just for the fun of it, the country I am in is bordered by Greece, Albania, Syria, Iraq, Iran and Armenia, with coasts on the Black, Adriatic and Agean Seas.

And in some respects it is the sphinter of the universe!! Although I don't mind it. Sphincters are not all bad.

[Rolls]

I work best at night, often write software when I am pissed that I wouldn't normally be motivated to do, then I get kudos from my boss and some extra money.

[Rolls]

whats happening in the sphincter of the universe ?

[GTSBoy]

Am trying to make the kiln burner here work properly. I designed it last year, installed in February, and it hasn't worked properly since. Has in fact made the whole plant worse. It's my fault and it's not my fault. Bloody plant has huge issues. Given the huge issues I should have called the whole thing off instead of proceding. But I let optimism strike me, went ahead with it, optimism bailed on the deal and left me with a handful of poo. The goat lovers are also not very able to handle the subtleties of a carefully written performance guarantee, and refuse to accept that given that the plant is poo, it is not entirely my fault that my burner made it smell worse.

[GTSBoy]

Oops. Goat lovers is another auto substitution, that whilst funny......would not help me if any of them read it!

[Manuel Kasko]

Rolls my idle sounds very similar to yours.

I idle at around 1400-1500 when cold and it hunts randomly and sits there missing until warm.

Once warm idle drops to around 700 and them every now and then hunts but does not miss.

If you take it for a drive when cold

As you take your foot off and coast you can feel it missing.

All goes away when warm

[Rolls]

Hmm this morning it was much much better, I didn't drive the car yesterday at all so it must have been completely stone cold, still did a slight miss for 3 seconds then come good for 3 seconds but it didn't want to stall, just went from 1300rpm to 1000-1100rpm.

Tonight it was back shit again wanting to stall from 1300 to 400rpm.

I have my laptop back so I will plug in consult and do a dump of injectors/afm etc vs rpm when its cold see if it is an ECU or mechanical problem, I personally think it is fouling the plugs up from possibly too rich an idle.

[Rolls]

Is ur fuel pressure stable? Ie has the pump been rewired to battery voltage?

Is 02 feedback enabled?

If u have the software or consult keep a close eye on inj duty when idle is good and when idle is playing up. Let me know the readings

Ok did a log when cold, when at 1200rpm the duty cycle is 1-2 and pulse width is 2.2ms, when it stumbles duty is 1 and pulse width grows to 2.5ms all the way to 3ms when it starts missing badly, timing changes from 30 to 34 when stumbling, acc duty increases slightly.

Stab the throttle and it goes back to 1200 and duty at 2, pulse at 2.2ms, starts to stumble and go up to 2.8ms etc.

Would this be as simple as just changing the cold start enrichment at 20-30c so it is slightly less rich? I'm going to buy a license next month so will have a fiddle then.

So I am guessing the cold start is just simply too rich

Edited June 13, 2012 by Rolls

[DVS JEZ]

Its possible. Bust never assume its too rich without having a wideband to tell u afr.

The timing doesn't seem right. It should not be at 30 degree's at idle. That tells me ur tps may not be setup correctly. Try dropping the tps back a tad ie: if its at .5 try .46

[Rolls]

When it has been running for a few minutes the timing drops back to 20 then 15 degrees at idle

TPS is at 0.88v when idling, I can try adjusting this, is there a screw on the tps itself?

[Rolls]

here is the log

ecutalk1362012_2.xlsx

Edited June 13, 2012 by Rolls