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F150 No code intermittent misfire issues
- Tyler
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Here is an image of what I'm talking about on top.
There may be something else going on at the time you took that screencap. There's a difference between the commanded equivalence ratio PIDs. One bank is 13.349, the other is 12.649. Maybe this was taken during changing load conditions? Maybe the PCM was running an invasive emissions test at the time.
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- 52Tele
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Or Does it lean more towards VCT issues now?
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- 52Tele
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- bills4065
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- 52Tele
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I did try 2 scanners at that time and they both had the same reading on that Pid.
I refueled the day after that and then yesterday that pid is back to normal.
I'm going to share 2 images one of mode 6 data. You'll see the amount of misfires registered during that drive cycle and the mode 6 data will show the amount on cylinder 6.
Since my issues first started cylinder 6 has always had the most misfires.
What I'm leaning towards currently is an intake manifold leak just on cylinder 6 or a possible valve issue. The intake manifold on this truck has individual gaskets per cylinder
I know typically vacuum leaks show up worse at idle. Is that the definite rule or can it be different with a MAP sensor controlled vehicle with an intake manifold like that?
Any input appreciated.
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- 52Tele
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- 52Tele
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- Tyler
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- 52Tele
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- 52Tele
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- 52Tele
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Also doesn't the lower AF ratio number mean that there is less air and should be calling for more fuel.
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- 52Tele
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Also is there anyone who has experience with VVT systems?
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- 52Tele
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- Noah
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I have seen some Fords with 2 sets of injectors. The traditional low pressure ones you can see in the rail, and high pressure GDI injectors in the heads under the intake where you can't see them.
The emissions control label under the hood should say "GDI" on it somewhere if that's the case. I'm with Tyler, find and fix that intermittent misfire and everything else should fall in place.
"Ground cannot be checked with a 10mm socket"
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- 52Tele
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- 52Tele
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I ended up replacing bank 2 VCT solenoids about 2 weeks ago and it helped the desired minus actual data pid readings on bank 2. Unfortunately the misfires are still happening. I took a picture of the intake camshaft on bank 2 the cam lobe in the picture has scratches that can be felt with my finger nail. Those scratches are on the intake camshaft at cylinder 6 which is where my misfires are happening. Anyone have any input?
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- 52Tele
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