Cylinder 1 Misfire - SB9T.com
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Old 12-06-2017, 08:50 PM   #1 (permalink)
b9T
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Question Cylinder 1 Misfire

I have been having intermittent cylinder 1 misfires. Getting a P0301 Code. Engine light blinking.

I replaced all of the spark plugs, as well as switched coil 1 with coil 6 to see if a bad coil could be the problem. But the problem still persists in cylinder 1.

It misfires at idle as well as at slower speeds >40. Will misfire for about 15 seconds and then it disappears and will return shortly after or not at all.


What else could I be looking at here? Wires look connected but could they be bad? Or could it be a fuel injector? Has anyone ran into a similar problem?


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Old 12-07-2017, 04:45 AM   #2 (permalink)
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Check the pigtail on the injector, the ground on the engine, and the wiring to the coil pack. If all that checks out you might either check the signal from the ecm, the fuel injector, or the compression.

My persistent misfire ended up being the ecm.
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Old 12-07-2017, 08:44 AM   #3 (permalink)
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100% what FLsubies says. That the exact path, but most find that it's the ECM once the coil is ruled out, but you need to change the other potential issues.

You can swap fuel injectors around as well.
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Old 12-07-2017, 10:10 AM   #4 (permalink)
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I avoided mentioning that only because you will need a set of o rings to replace the undoubtedly hardened ones on the engine now. If you are so motivated I have the o rings for one side of the engine (3injectors) id ship to you cheap.
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Old 12-07-2017, 12:26 PM   #5 (permalink)
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Check for any vacuum leak.
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Old 12-09-2017, 06:57 PM   #6 (permalink)
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Hey guys. So I checked the pigtails on the injector, checked the injectors, checked the wiring to the plugs. Nothing seemed amiss. I switched some injectors for the heck of it. But once I put everything back together, now my engine doesnt want to start at all. Am I missing something? I had pulled the fuel pump relay fuse before pulling the injectors, I then put it back in after everything was back together. But it won't start now.
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Old 12-09-2017, 07:13 PM   #7 (permalink)
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I would suggest making doubly sure everything was plugged back in and there were no fuel leaks or loose connectors. You might also try a different relay, I pulled my fuel pump fuse when I checked my injectors and fuel pressure I am not sure what it was you pulled as I believe the FP fuse is in the underhood fuse panel.
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Old 12-10-2017, 02:53 AM   #8 (permalink)
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Quote:
Originally Posted by b9T View Post
But it won't start now.
So now you have to start looking from scratch, spark, injector pulse etc.
This could be helpful

https://www.youtube.com/watch?time_c...&v=S0Fs2i-XBKI
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Old 12-10-2017, 03:11 PM   #9 (permalink)
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Got it starting again. Ended up being a blown 15A fuse. But still having a misfire on cylinder 1 after switching the injector to 5 and coil to 3. Wires to the coil check out as well.

When this first started it was intermittent. After changing the spark plugs it seemed good for 30 miles, after starting it up again it immediately started misfiring and does it constantly ever since.


Not the injectors, not the wiring, not the plugs, and not the coils. But still isolated to cylinder 1.

Any other ideas?
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Old 12-10-2017, 03:14 PM   #10 (permalink)
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How do we diagnose the ecm?
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Old 12-10-2017, 03:43 PM   #11 (permalink)
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You had the misfire before changing the plugs and it is still persistent with the same cylinder. Here is the section dealing with misfires from the fsm. Definitely sounds like the ecm, which stinks I know. We paid last year $1450 for the dealer to replace it.
Attached Files
File Type: pdf misfire troubleshoot.pdf (1.50 MB, 3 views)
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coil, cylinder 1, fuel injector, misfire, p0301


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