DFZ24

iTrader: (5)

I got some answers but i want to know what other people think or give some feedback.
So let start with timeline.

car is a 2.4 boosted at 10psi, with 39# injectors, with spark plugs gap at .034, car is catless.
the car would misfire a lot at cold idle and a little when warm. Car had a really, but really light smell of gas through the exhaust. Spark plugs were the autolite use in zzp turbo kit, but i had this problem also in ngk too.

Now, I changed the spark plugs to ngk again but gap to .030. The misfire at cold idle is much less than before. The gas odor from the exhaust tho got stronger, much stronger.

Now my questions are;

1. Is the gap too small? (from research I found that it could be the issue, but the misfire at idle is much less)

2. Is the coil packs are going bad or getting weak?

That's all I can think of right now,
If you have any question or I didn't provided some information, please feel free to ask.

ECaulk

iTrader: (6)

What is your AFR at idle? Because if you're smelling gas i'd guess its not where it should be, that would explain the misfires. Honestly it seems like the tune isnt correct. You could always make sure the connectors on the coil pack to the spark plug are free of corrosion first, but I'm betting its the tune if this has been the issue ever since you boosted it and put the 39# injectors in

DFZ24

iTrader: (5)

car still have the 39# injectors,
AFR is back and forth because there is no sensor in the car due to catless.
misfire feels like a vacuum leak but cant find it, i did the vacuum leak test and everything.
car accelerate and drives fine with no misfires.

blueLNFftw

iTrader: (16)

Did this tune ever have the car run correctly?


The rear o2 not being installed has nothing to do with AFR. That sensor is for cat efficiency only.

Are there codes?
P0300?

Snail_SS

iTrader: (3)

And afr is supposed to move around the 14.7 so go maybe 13 and the go 15 that means its going from lean to rich to lean and so forth.

DFZ24

iTrader: (5)

Moves around that
And the tune is fine just need little more touch up, I will post the dyno graph.
Street tune
I get the p0300 from time to time

blueLNFftw

iTrader: (16)

Who is tuning it?

DFZ24

iTrader: (5)

ItalianJoe

blueLNFftw

iTrader: (16)

I've seen p0300 random misfires be caused by injector tables being off, in pw iirc.

Generally ignition based misfires give different codes.

Were those injectors new?

DFZ24

iTrader: (5)

Good question, I think so lol
They are the one that came in with the first gen zzp turbo kit for 2.4 air liquid cooled.
I have a set of 60# used from zzp too stored.

blueLNFftw

iTrader: (16)

That's up to your tuner. I don't know anything about the 39's or the tables for them. Only know the 60's are tried and true.

What is your idle afr fluctuating? Is it idle hunting?

DFZ24

iTrader: (5)

It fluctuates just like eddieavila said but like a little more to the 12-16
Noob question.... Idle hunting?

noorj

iTrader: (17)

At idle afr should go between 14.3 and 15.1, if it's going from 12-16 that is not correct. If your catless a slight fuel smell in the exhaust is normal though, I wouldn't worry about that. What ngk plugs did you try? .032 is certainly not too small of a gap, I ran .026 for a while just fun. Do you have HPT? would be helpful to see what spark is doing

DFZ24

iTrader: (5)

the smell of gas was there but wasnt that strong, now it got stronger.
yes HPT
iridium LTR6IX-11 gapped at .030

you can take a look at the old chart too both in my album

here is the dyno chart, end of the graph is the blowout, with autolite gapped at .034
not too long ago
4th gear pull and one 3rd gear pull

Twoozofjuice

iTrader: (7)

Use stock lnf plugs. I have mine gapped at .032 12 psi e85. No misfires 80# injectors

That graph doesn't look so good btw...

DFZ24

iTrader: (5)

lnf plugs work on le5?

Twoozofjuice

iTrader: (7)

Yessir. Work great for me

DFZ24

iTrader: (5)

Going back to the main question, I would like to know why after I close the gap, the smell of fuel got stronger.
If nothing changed, just the gap.

Snail_SS

iTrader: (3)

Yeah your fluctuating to much on your AFR for sure so have that checked out. And my numbers where just a type of reference not exact numbers just to give you and example on what it should do but the closer to the 14.7 the better

DFZ24

iTrader: (5)

I'll try to get a video or look at more. I know it move alot but don't know exactly how far.
But that was doing it even with plugs gapped at .034

Spawne32

iTrader: (1)

That dyno graph looks terrible...definitely tune related IMO. I'd be willing to bet he still has the stock injector information in the tune and didnt change the data for the new injectors.

DFZ24

iTrader: (5)

Video of AFR at idle
You can see the misfire, that misfire after the kit was changed from air/liquid to air/air system.
The only thing that was changed was the position of the maf and had to be extended.

ECaulk

iTrader: (6)

You need to get a tune update, your VE and MAF tables are not agreeing or your injector tables are off and the narrow band is trying to compensate, you should idle at 14.7 and only change to 14.5 to 14.9 at most.

Twoozofjuice

iTrader: (7)

Why did you swap to air to air? Just wondering since I hear that air to water is better

Spawne32

iTrader: (1)

It is and it isnt, like the supercharger intercooler system, it relies on the size of the cores in the air-water exchanger to be efficient, but yes water has a higher thermal capacity then air so it can remove much more heat then an air to air system, IF the intercooler core is large enough.