Cold start miss fire
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Mountain Pass
Joined: Mar 2020
Posts: 153
Likes: 24
From: North west North Dakota.
Cold start miss fire
I need help.
I have a 2005 v10 limited 4x4
i have a cold start miss fire on cylinder 4.
it only misses on cold start for about 2 - 3 minutes.
Then goes away and runs just fine.
when running errands it will start just fine no miss.
if the engine has time to fully cool off then it will miss on start up. For about 2 minutes then goes away.
Miss fire developed on cylinder 7 and 5. I ordered motorcraft plugs and denso coils. I did a tune up.
and now my cylinder 4 miss on startup is here.
code is random miss on start up and cylinder 4 miss.
I have moved coils around to see if miss would move with coil. Miss stays on cylinder 4.
gap on plug is set at .054 and torqued to 20lbft.
any suggestions will be appreciated
thank you.
I have a 2005 v10 limited 4x4
i have a cold start miss fire on cylinder 4.
it only misses on cold start for about 2 - 3 minutes.
Then goes away and runs just fine.
when running errands it will start just fine no miss.
if the engine has time to fully cool off then it will miss on start up. For about 2 minutes then goes away.
Miss fire developed on cylinder 7 and 5. I ordered motorcraft plugs and denso coils. I did a tune up.
and now my cylinder 4 miss on startup is here.
code is random miss on start up and cylinder 4 miss.
I have moved coils around to see if miss would move with coil. Miss stays on cylinder 4.
gap on plug is set at .054 and torqued to 20lbft.
any suggestions will be appreciated
thank you.
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
Not sure how to test for a sticky injector.
The #4 power for the injector and coil comes from splices that would probably cause issues on other cylinders on that bank, but there could
be a problem in the wires from the splices to the #4 connectors.
Do you get a good 12v at the injector/coil connectors?
A wiring issue on just #4 would more probably be in the coil/injector wire to the PCM.
Or the grounding chip in the PCM could be bad for #4.
Thread Starter
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Mountain Pass
Joined: Mar 2020
Posts: 153
Likes: 24
From: North west North Dakota.
Misfires can also be caused by a clogged/sticky fuel injector or wiring that is degraded.
Not sure how to test for a sticky injector.
The #4 power for the injector and coil comes from splices that would probably cause issues on other cylinders on that bank, but there could
be a problem in the wires from the splices to the #4 connectors.
Do you get a good 12v at the injector/coil connectors?
A wiring issue on just #4 would more probably be in the coil/injector wire to the PCM.
Or the grounding chip in the PCM could be bad for #4.
Not sure how to test for a sticky injector.
The #4 power for the injector and coil comes from splices that would probably cause issues on other cylinders on that bank, but there could
be a problem in the wires from the splices to the #4 connectors.
Do you get a good 12v at the injector/coil connectors?
A wiring issue on just #4 would more probably be in the coil/injector wire to the PCM.
Or the grounding chip in the PCM could be bad for #4.
not sure on fuel injector testing.
thank you for the information
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