napoleon1981

Here is a log of a cold start up, just letting it idle.

I highlighted Cylinder 6, and 4 and 3. Cylinder 4 had an occasional miss. You can see that it fires up, runs ok, then starts to miss for 40 seconds or so, and then it all resolves. I must have activated some other logs during the running so the column headers are screwed up.

Carlo_Carrera

That is damn peculiar. Only three cylinders having problems and on opposite banks.

The only thing I can come up with to check is the individual injectors or whatever is feeding data to those injectors.

napoleon1981

Its weird. It is only during those 40 seconds, as soon as the choke comes off it is pretty much eliminated.

Ill do the pull and share the data. It would be interesting to see what the OP gets for his data and what Kevin can see.

Thanks you all for the thoughts, and sorry to the OP for (partially) high jacking his post.

napoleon1981

Here is the 3rd gear pull. I had was only holding it shortly in 4th because of traffic. Let me know if it is good enough.

Kevin

What are your short term and long term fuel trim?

When have you done spark plugs. What plugs, GAPPED at? What is your fuel octane? Fuel pressure measured at the filter on start up/idle? You have a X50? (I can see the top end fuel dump and boost/ lag ramp)?

napoleon1981

-It is an X50
-plugs are new Bosch FR6 -LDC. I gapped them at 0.27. The old plugs were 3k miles /2 years old before the problems started. These were gapped wider (unadjusted ~0.32 -0.34). I changed them just because i was in there checking brackets and swapping coil packs around.
-Octane = 93 (premium in illinois)
-Fuel pressure dont know, need to buy a gauge. The pump is new and the filter is 3k old. I replaced the old fuel pump since it was very noisy and i had the misfires (noticed both at the same time so i thought that was the issue). New oem pump with all new pickup hoses. Didnt fix the issue obviously....
- FRA bank 1: 1.05
- FRA bank 2: 1.03
-RCAT bank 1: -0.52%
-RACT bank 2: -0.75%

2fcknfst

I am going to have a hard time doing that where I am without running the risk of getting arrested, the Horsemen now impound here at 40kmh over the limit. I suspect the top of third is 40kmh over the limit...

2fcknfst

No problem, it's all good - it is difficult for me to get this data due to where I am physically located; gotta drive for quite awhile to get to some good highway.

In looking at the data you posted, your mixture data seems very progressive and uniform across both sensors.

My day two starting and holding at 2k rpm, not a problem, drove maybe 20kms round trip with two stops.

2fcknfst

I am almost the same:
- X50
- Bosch FR6 gapped at .26
- New factory injectors
- New fuel filter
- New coils
- Chevron 94 octane (Canada)

Kevin

I think your Gap is a little to tight.. I'd run the gap at .034" with 93 and a STOCK tune. I'd also install the larger Beru coilpacks (slightly more energy).. I would be checking the post intake/pre turbo for intake leaks.
Your fuel trim numbers are available when you start your car. Also check your camshaft deviation numbers.

Head North out of town or you can run it south over the border in Lynden.. Have a friend run chase ahead of you.. It just takes 6 to 8 seconds..

napoleon1981

There are two of us. But I have the larger Beru ones. Same error running plugs at 0.026 and ~0.034. Pre and post turbo is tight, no leaks.

Here are the fuel numbers:
FRA bank 1: 1.05
- FRA bank 2: 1.03
-RCAT bank 1: -0.52%
-RACT bank 2: -0.75%

2fcknfst

If I read this correctly - does that mean that RCAT bank 1 is slightly more inefficient than bank 2?

napoleon1981

They are fuel trim numbers RCAT is a typo should have been RKAT.

RKAT is near idle and FRA is under load i believe. These numbers look within tolerance to me, but Im not used to looking to it, so an expert oppinion would be nice.

2fcknfst

And that is not me...

But looking at your exel numbers, the car seems to be running well; mine does - I am having a hard time making the connection between loading the engine up, and what is happening when you cold start the car. To me, those are two different scenarios and are not connected - I wouldn't load the car up until it is good and warm.

Kevin

napolean Your RKAT is negative so you are running rich
You say you changed your MAF>> Aftermarket or genuine Bosch?
Have you changed your wideband O2 sensors? They control your fueling and set the tone for closed loop operation when running thru the MAF
Do you have a stock intake >>when pulling the lower boost hose from turbo to IC on the drivers side is there any oil present?