Check engine light after hard launch - Ford Transit USA Forum
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post #1 of 14 (permalink) Old 05-20-2019, 06:02:PM Thread Starter
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Check engine light after hard launch

I checked all 8 pages here and no sign of this being a common problem. Care to take a guess?
Help needed.

4 times now during a hard take off or a passing maneuver my 2015 3.5 with 44k has flashed the check engine light. Twice of that the light stayed on, twice it went off after a minute or so. The first time the puter said random misfire or that is all I was told. The second time they changed the coil, all the plugs and the injector and it is still doing it. Code again was misfire on C1. I should get the real code huh :/. Anyone been through this one?
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post #2 of 14 (permalink) Old 05-20-2019, 06:42:PM
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Might be a momentary issue, the firing not recording as quickly as the rpms change. Or maybe with MAF vs boost pressure ratios not in spec due to the jackrabbit start.
It's always better to ease into things, like an old man into a hot bath.

I wouldn't worry about, even little glitches that almost instantly correct themselves can trigger a CEL. If there was no computer on board, you'd never know this had even happened.

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post #3 of 14 (permalink) Old 05-20-2019, 06:57:PM
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Were you running premium 93 octane gas or just regular 87 octane during this hard launch, maximum performance driving adventure?

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post #4 of 14 (permalink) Old 05-21-2019, 09:17:AM Thread Starter
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I do think that I may have put regular in this last time just to see how it did. Could that really cause it to toss a check engine error though? I am sure this is the first time I have put regular in though and this is the 4th time it has done it.

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post #5 of 14 (permalink) Old 05-21-2019, 10:14:AM
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Isn't the 3.5 designed for 87 octane? I don't know, just axing.

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post #6 of 14 (permalink) Old 05-21-2019, 10:46:AM Thread Starter
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Originally Posted by surly Bill View Post
Isn't the 3.5 designed for 87 octane? I don't know, just axing.
Yes it says to use 87 octane. I have been running 89 mostly. Still you would not think 86 would toss engine errors.
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post #7 of 14 (permalink) Old 05-21-2019, 11:06:AM
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It "might" if your engine control system adapted itself to 89 and was then hit with 86 and had to re-adjust timing and stuff based on sensor feedback. But that couldn't happen, because the 89 and fresh 86 would mix in the tank and lines and the change would be gradual.

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post #8 of 14 (permalink) Old 05-21-2019, 11:42:AM
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The first year I owned my Transit I ran nothing but pure gasoline in my Transit, (No Ethanol) The first day I ran E-10 the throttle body died and had to be replaced, It could have been just a coincidence...

There is a throttle body recall for the 2016s.
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post #9 of 14 (permalink) Old 05-21-2019, 04:39:PM
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From the 2019 owners manual (pg 136):

Your vehicle is designed to operate on regular unleaded gasoline with a minimum pump (R+M)/2 octane rating of 87.

Some fuel stations, particularly those in high altitude areas, offer fuels posted as regular unleaded gasoline with an octane rating below 87. The use of these fuels could result in engine damage that will not be covered by the vehicle warranty.

For best overall vehicle and engine performance, premium fuel with an octane rating of 91 or higher is recommended.
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post #10 of 14 (permalink) Old 05-21-2019, 04:44:PM
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Originally Posted by bobatx View Post
i do think that i may have put regular in this last time just to see how it did. Could that really cause it to toss a check engine error though? I am sure this is the first time i have put regular in though and this is the 4th time it has done it.
yes

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