removed cover from intercooler
03-22-2014, 01:32 PM
#11
At cruising speeds (meaning part throttle) your should be somewhere around 14.7, which is Stoich. Your not going to be perfectly at 14.7 100% of the time, but you should bounce around it. If you are in the mid 13s while just cruising, you need to get that fixed, your dumping extra fuel into the motor. Your computer should be able to compensate for most changes that occur. Since you removed the top cover of your intercooler, did you unhook the battery?
If not, I would unhook the battery for about 10 min to reset the KAM. The KAM or Keep Alive Memory, is Fords way of the computer remembering the setting to make the car run. Disconnect the negative battery terminal and pull the headlight switch on(PCM gets power from headlights). Let it sit for 10-20 min, then connect it back up and turn the truck on. Let it idle for a little bit with the a/c lights and everything off. Don't touch the gas pedal or anything else, just let it sit and idle. It might be a little rough for a few minutes until it relearns the parameters, then it should be good to go.
See if that helps.
If not, I would unhook the battery for about 10 min to reset the KAM. The KAM or Keep Alive Memory, is Fords way of the computer remembering the setting to make the car run. Disconnect the negative battery terminal and pull the headlight switch on(PCM gets power from headlights). Let it sit for 10-20 min, then connect it back up and turn the truck on. Let it idle for a little bit with the a/c lights and everything off. Don't touch the gas pedal or anything else, just let it sit and idle. It might be a little rough for a few minutes until it relearns the parameters, then it should be good to go.
See if that helps.
PCM has it's own fused power source from the truck's dc supply bus. Not from the headlites.
The reason you pull the headlite switch after a neg bat cable disconnect is to drain any residual electrical charge stored in the filter capacitors within the PCM (and anywhere else); yer loading the dc bus in general. This depletion ensures the KAM's volatile memory device is not longer being energized.
With a load like the lights, this depletion only take a couple minutes at most.
The rest of yer info is good though. That l'il part was just bugging me fer some reason
MGD
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JCP281 (03-22-2014)
03-22-2014, 01:47 PM
#12
^^^ lol
PCM has it's own fused power source from the truck's dc supply bus. Not from the headlites.
The reason you pull the headlite switch after a neg bat cable disconnect is to drain any residual electrical charge stored in the filter capacitors within the PCM (and anywhere else); yer loading the dc bus in general. This depletion ensures the KAM's volatile memory device is not longer being energized.
With a load like the lights, this depletion only take a couple minutes at most.
The rest of yer info is good though. That l'il part was just bugging me for some reason
MGD
PCM has it's own fused power source from the truck's dc supply bus. Not from the headlites.
The reason you pull the headlite switch after a neg bat cable disconnect is to drain any residual electrical charge stored in the filter capacitors within the PCM (and anywhere else); yer loading the dc bus in general. This depletion ensures the KAM's volatile memory device is not longer being energized.
With a load like the lights, this depletion only take a couple minutes at most.
The rest of yer info is good though. That l'il part was just bugging me for some reason
MGD
I remembered reading the PCM drew power from headlights back in the mustang days. Maybe that person wrote it wrong, or I read it wrong....either way at least the secrets out. TBH, I did think it was strange that it wouldnt have its own source but F it. I edited the original post to reflect my loss of brain power on the response.
Last edited by JCP281; 03-22-2014 at 01:51 PM.
03-22-2014, 08:48 PM
#13
Senior Member
Pulling the deflector will not affect a/f ratio. What minuscule difference it does make to the air flow rate will be offset nearly instantly with a closed-loop fuel correction. The eb ECM is fast enough to make corrections from one revolution to the next, so it doesn't take 200 miles or a reset for it to happen.
Last edited by engineermike; 03-22-2014 at 08:50 PM.
03-22-2014, 09:37 PM
#14
Senior Member
This is a very confusing subject and you may already know this. Basically, all widebands, regardless of fuel type, read out in lambda. You then convert to a/f based on fuel type. So, if its programmed for pure gas and you run e85, you still shoot for 14.5 on the readout, because its not a correct number but does indicate your lambda is dead on at 1.0.
03-22-2014, 10:54 PM
#15
Pulling the deflector will not affect a/f ratio. What minuscule difference it does make to the air flow rate will be offset nearly instantly with a closed-loop fuel correction. The eb ECM is fast enough to make corrections from one revolution to the next, so it doesn't take 200 miles or a reset for it to happen.
03-23-2014, 11:13 AM
#16
Senior Member
Thread Starter
Pulling the deflector will not affect a/f ratio. What minuscule difference it does make to the air flow rate will be offset nearly instantly with a closed-loop fuel correction. The eb ECM is fast enough to make corrections from one revolution to the next, so it doesn't take 200 miles or a reset for it to happen.
ok so do I need to be concerned about it bouncing from high 13's to low 14's. the last few tanks of fuel have been 89 octane with 10% ethanol. does the ambient temp have anything to do with it.
only a couple weeks back it was running 14.5-15. the only thing changed was the deflector removal- and I also didn't think that would affect it much.
I have about 7k miles on the truck. is there a point where mileage effects it per the computer??
03-23-2014, 12:34 PM
#17
ok so do I need to be concerned about it bouncing from high 13's to low 14's. the last few tanks of fuel have been 89 octane with 10% ethanol. does the ambient temp have anything to do with it.
only a couple weeks back it was running 14.5-15. the only thing changed was the deflector removal- and I also didn't think that would affect it much.
I have about 7k miles on the truck. is there a point where mileage effects it per the computer??
only a couple weeks back it was running 14.5-15. the only thing changed was the deflector removal- and I also didn't think that would affect it much.
I have about 7k miles on the truck. is there a point where mileage effects it per the computer??
04-25-2014, 02:07 PM
#19
I also removed the top cover from my intercooler -- after I saw that it was the current guidance from Ford in TSB 14-0017 (which mentions a couple of possible codes thrown). If the indicated codes aren't thrown, the TSB instructs the tech to remove the cover and discard it, provided the engine is up to date with IDS 88.03 or higher.
It seems Ford seems to be bouncing around this EcoBoost stumble issue, and have been grasping at straws to find the cause. I never had the issue - so off my cover went.
It seems Ford seems to be bouncing around this EcoBoost stumble issue, and have been grasping at straws to find the cause. I never had the issue - so off my cover went.
04-25-2014, 08:53 PM
#20
There is an option within the torque app to add how much ethonal is in the gas. When I enter 10% my measured afr ratio runs around 13.9 to 14.3. If I put 0 ethanol it's around 14.5 to 14.8
