H3T Alpha rough idle at cold start, goes away after a minute

[2010H3TAlpha]

Within the last week my truck has developed a rough idle at cold start which goes away after a minute. Zero issues starting warm and no engine codes. My truck only has 47k miles too. I tried searching for other reports, but I could only find idle issues for the I5. Before I start tearing through the intake side and cleaning everything, anyone know what the issue might be?

 

[VIPNiSS]

Within the last week my truck has developed a rough idle at cold start which goes away after a minute. Zero issues starting warm and no engine codes. My truck only has 47k miles too. I tried searching for other reports, but I could only find idle issues for the I5. Before I start tearing through the intake side and cleaning everything, anyone know what the issue might be?

personally myself I would start with cleaning the MAF sensor to see if that does anything. Then i would check the plugs and wires to see if they all look good. It could be that theres a crack of some sort and when the engine get a bit hot it seals it.

 

[2010H3TAlpha]

Thanks, so the emissions vacuum hose was unattached, but reattaching it did not fix the issue. I will clean stuff up tomorrow and inspect the plugs, etc.

 

[VIPNiSS]

try resetting computer? unplug battery for 10 mins or so and wait again for cold start?

 

[2010H3TAlpha]

Will do, thanks for the idea.

 

[2010H3TAlpha]

I reset the PCM earlier this week and it has definitely improved, but still a few seconds of rough idling at startup. I am going to replace the emissions vacuum line and see oi that fixes it, definitely weird it was unhooked to begin with.

 

[USMC_TOP]

Try Mobil or Shell fuel


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