B284L 2.8 V6 - #6 Coil Location (misfire) - SaabCentral Forums
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9-3 Sedan, Convertible ('04+)/Combi & 9-3X Tuning/Modifications - 2.8T V6 ONLY Covers Tuning & all Performance modifications specific to 2.8T V6 ONLY

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  #1  
Old 2nd May 2019
cloves cloves is offline
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Question B284L 2.8 V6 - Multiple Misfire Codes - Changed 2 Coils - Didn't Fix Issue

Hi all,

I am getting a misfire from my cylinder 6. Looking at the WIS pretty sure that is in the front right (driver side). Can someone confirm this? I just saw someone on the forums say its in the back which somewhat confused me. I just changed the one in the front and my misfire is still misfiring which got me worried wis or my reading of it is wrong.

UPDATE: So I changed both #5 and #6 Coils (Since I picked up 2 just in case), problem didn't go away. I am getting multiple misfires and the engine was running terrible during the test. Car has about 82k on the meter. I changed the plugs a in February because I was occasionally not long after startup the car would hesitate when I was accelerating from a dead stop. The issue somewhat disappeared for the last few months and now I have the misfire issue. Maybe the plugs were not the issue originally. The car did have its #5 coil replaced with a non Bosch one so I figured it might be the issue. But as stated #5 and #6 are both new coils. Still showing misfires in those cylinders.

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Last edited by cloves; 2nd May 2019 at 09:35 PM.
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  #2  
Old 2nd May 2019
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Looking at the engine from the grill, front bank far right. Closest to the battery.

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Old 2nd May 2019
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Quote:
Originally Posted by Artfulkatana View Post
Looking at the engine from the grill, front bank far right. Closest to the battery.

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Yeah, right next to the turbo. Great spot for a coil pack...
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Old 2nd May 2019
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I updated the thread, misfires continue after coil #5 and #6 replaced. Car is running terrible now.

I took a look at the fuel injector area, this looks a bit odd.

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Last edited by cloves; 2nd May 2019 at 09:45 PM.
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Old 2nd May 2019
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Quote:
Originally Posted by cloves View Post
I updated the thread, misfires continue after coil #5 and #6 replaced. Car is running terrible now.

I took a look at the fuel injector area, this looks a bit odd.

Attachment 252116
What gap are you running on the plugs?
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Old 3rd May 2019
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Are those furthest along the rail? How does fuel pressure look?
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Old 24th May 2019
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Default New Coils All Around - Misfires Two Days Later

Hi all,

So I ended up replacing all the coils with new Bosch ones. Replaced all the plugs in Feb with NGK 1959 {#PLFR6C10G} gapped at 0.040 (@Joshinator99) (sticker on the cars front says to gap them at 0.035 - 0.039 so I figured 0.040 would be ok.

Car worked great for 2 days and today again while on the highway I started getting misfires. So plugs, battery, and coils are all new.

@diggs I guess I should check to see what my fuel pressure is at this point. I don't think I can do that with the tech 2 and I have to use a fuel gauge right?
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Old 24th May 2019
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A bigger gap can cause blow-out of the spark. I'd recommend closing the gap to the smallest recommended size.

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Old 24th May 2019
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Quote:
Originally Posted by Artfulkatana View Post
A bigger gap can cause blow-out of the spark. I'd recommend closing the gap to the smallest recommended size.

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I don't think the issue here is the spark plugs. From my understanding the smaller the gap the more possibility of misfire no?
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Old 24th May 2019
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Quote:
Originally Posted by cloves View Post
I don't think the issue here is the spark plugs. From my understanding the smaller the gap the more possibility of misfire no?
No, not in this case unless you were getting fouling from a rich fuel condition or excess oil in the cylinders at the time of operation. If you had water/meth injection, I would say taper that down a bit, but I suspect you don't have that.

You exceeded recommended gap already, I'd bring it down.

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Old 28th May 2019
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x2. Big gaps are a bigger problem with boosted motors and will lead to misfires or blow out. You will want to stay within spec, and starting at the low end of spec will increase reliability as the plug erodes over time and the gap "naturally" widens.
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Old 28th May 2019
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Quote:
Originally Posted by jvanabra View Post
x2. Big gaps are a bigger problem with boosted motors and will lead to misfires or blow out. You will want to stay within spec, and starting at the low end of spec will increase reliability as the plug erodes over time and the gap "naturally" widens.
This. Brian at VTuner had me running 0.80mm (~.0315”) on my ‘11 9-5 Aero plug gap and that worked mint.
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Old 2nd June 2019
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Given the context, is your fuel pump running ok?

What about injectors?
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Old 2nd June 2019
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hey guys so i pulled all my plugs and i actually had them gapped at 0.036 which is well within the low end of the spec. after installing everything car started fine and no misfires. but that is exactly what happened last time. i have been reading in a Facebook group how i could be having issues at the wiring harness for the injectors. this puts me in a bind now because the last time i started getting misfires was on the highway and i drove the car below 50 to get home tried to avoid the highway all together. But seeing as the misfires went away after checking the gap on the plugs still at a loss to what's causing the issue
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Old 2nd June 2019
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Quote:
Originally Posted by SebastianG View Post
Given the context, is your fuel pump running ok?

What about injectors?
Using the tech2 and the fuel pump diagnostic test which is a series of pulses and then you check your fuel pressure gauge everything with the fuel pump checked out.

I have not checked the fuel injectors, being that the back injectors are under the intake not sure how I would be able to test that. I will dig into the wis. Being that I am seeing multiple misfires in two cylinders then the rest, I am thinking its further up then the injectors but thats just me thinking out loud.
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