Ecoboost Idle

Casflynn said:

Wanted to share some info. 17 Limited with 20k. Has been cold as he*l here in PA lately and I started to notice a rough idle on cold start. I could feel it in the steering wheel and “see” it when I looked the engine, wife says she didn’t notice anything. So I thought maybe I was over thinking things, but me being me, new plugs (motorcraft 534, gap 30) and new coil boots. Plugs looked ok, little carboned up, not awful, gaps between 32 and 36. No change in idle. Then did a PCM reset and went through the idle relearn process, cleaned all 3 sensors, air temp, boost before throttle body, intake pressure (this one was a little oily), also filled up with a fresh tank of 91( top tier). Idled much better. So not sure if it was plugs, the relearn, the gas, map sensor, or a combo of all four. Just wanted to pass it along. Also if you are an over maintenance guy, I recommmed plugs maybe every 30 after seeing these at 20. Also plan on hitting the intake pressure sensor every oil change from now on. Cheers

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Casflynn said:

Got to kill the capacitors, so disconnect negative battery terminal and either run a jumper from the neg lead to the positive ( throw a rag over the neg batt terminal so nothing bad happens) or just leave it un hooked overnight. Then turn everything off inside, radio,lights, heater, turn key on for 10 seconds, then start, don’t touch the throttle for 10 minutes until operating temp, then put in drive and run heater at full blast to put load on the engine, after that idle is reset.

But this also resets the shift adapts, so you need to go drive it for a awhile getting it up into 6th and back down. No full throttle, nice and easy


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J Ski said:

View attachment 23411 View attachment 23412
Before and after of MAP sensor on intake manifold after only 22k miles. Will be cleaning this one every oil change from here on out. Will check plugs at 30k

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sixsix said:

Is this the one right past the air filter? I take the top lid of the air box off to change the oil filter and mine looked clean with 40k on the clock. I get a rough idle every now and then, I was planning on changing the plugs to see if that would help.

Edit: just went look under the hood and I see it obviously not the one after the air filter...


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Casflynn said:

Wanted to share some info. 17 Limited with 20k. Has been cold as he*l here in PA lately and I started to notice a rough idle on cold start. I could feel it in the steering wheel and “see” it when I looked the engine, wife says she didn’t notice anything. So I thought maybe I was over thinking things, but me being me, new plugs (motorcraft 534, gap 30) and new coil boots. Plugs looked ok, little carboned up, not awful, gaps between 32 and 36. No change in idle. Then did a PCM reset and went through the idle relearn process, cleaned all 3 sensors, air temp, boost before throttle body, intake pressure (this one was a little oily), also filled up with a fresh tank of 91( top tier). Idled much better. So not sure if it was plugs, the relearn, the gas, map sensor, or a combo of all four. Just wanted to pass it along. Also if you are an over maintenance guy, I recommmed plugs maybe every 30 after seeing these at 20. Also plan on hitting the intake pressure sensor every oil change from now on. Cheers

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J Ski said:

No, take the black engine cover off and it’s got one screw holding it into the manifold almost dead center under the cover

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