4.6 rough idle
Cargo Master
Joined: Jul 2009
Posts: 2,541
Likes: 54
From: Des Moines
Yeah I’m not sure if there’s any significance to that module info or not. The TSB states it needs to have calibration version 75.03A or newer. Our scan tool at work shows the software version and a few other things so I can use that for comparison if needed.
If your scan tool shows throttle plate angle at all, it will be in live data. Don’t be fooled by how it’s listed either - there can be multiple PIDS for it listed in different ways - it can be shown as volts, degrees, or percentage and they can be several lines apart (example, near the top of the list it might say electronic throttle signal 0.5 volts but closer to the bottom it might say throttle plate position 12%) so thoroughly read through the full list of data to see if there’s more than one PID.
If it helps, Ford lists the PID as ETC_TRIM in the TSB.
If your scan tool shows throttle plate angle at all, it will be in live data. Don’t be fooled by how it’s listed either - there can be multiple PIDS for it listed in different ways - it can be shown as volts, degrees, or percentage and they can be several lines apart (example, near the top of the list it might say electronic throttle signal 0.5 volts but closer to the bottom it might say throttle plate position 12%) so thoroughly read through the full list of data to see if there’s more than one PID.
If it helps, Ford lists the PID as ETC_TRIM in the TSB.
Thread Starter
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5th Wheeling
Joined: Aug 2019
Posts: 41
Likes: 0
Yeah I’m not sure if there’s any significance to that module info or not. The TSB states it needs to have calibration version 75.03A or newer. Our scan tool at work shows the software version and a few other things so I can use that for comparison if needed.
If your scan tool shows throttle plate angle at all, it will be in live data. Don’t be fooled by how it’s listed either - there can be multiple PIDS for it listed in different ways - it can be shown as volts, degrees, or percentage and they can be several lines apart (example, near the top of the list it might say electronic throttle signal 0.5 volts but closer to the bottom it might say throttle plate position 12%) so thoroughly read through the full list of data to see if there’s more than one PID.
If it helps, Ford lists the PID as ETC_TRIM in the TSB.
If your scan tool shows throttle plate angle at all, it will be in live data. Don’t be fooled by how it’s listed either - there can be multiple PIDS for it listed in different ways - it can be shown as volts, degrees, or percentage and they can be several lines apart (example, near the top of the list it might say electronic throttle signal 0.5 volts but closer to the bottom it might say throttle plate position 12%) so thoroughly read through the full list of data to see if there’s more than one PID.
If it helps, Ford lists the PID as ETC_TRIM in the TSB.
Thread Starter
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5th Wheeling
Joined: Aug 2019
Posts: 41
Likes: 0
Cylinder 1 tested at 150 psi, cylinder 2- 155 psi, cylinder 3- 135 psi, cylinder 4- 140 psi, cylinder 5- 155 psi, cylinder 6- 165 psi, cylinder 7- 145 psi, And cylinder 8- 165 psi.
FTE Community Team
Joined: Jan 2019
Posts: 10,728
Likes: 1,497
1 150 -9.1% from 8
3 135 -10.0% from 1
7 145 +7.4% from 3
2 155 +6.9% from 7
6 165 +6.5% from 2
5 155 -6.1% from 6
4 140 -9.7% from 5
8 165 +17.9% from 4
Yeah, that would feel rough at idle. Not stalling/bad injector/missing spark rough, but still would be noticeable. See how the groups of plusses and minuses? If it were + - + - + - + - then it'd be less noticeable than the - - + + + - - + on yours. That +17.9% on 8 is just that much worse of a transition. I think many folks (including me) eyeball around a deviation of 10% between highest and lowest as acceptable on a well-used engine. Yours is 22.2% between the 3's 135 and 6/8's 165 . It doesn't appear to be on the edge of failing based on this, but that is a big difference. For a 14 year old pickup with over 150,000 miles on it, I'd say it's not worth an overhaul which you might as well do if you're going to tear it mostly apart to re-ring and hone. Just keep driving it.
My $0.02
Thread Starter
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5th Wheeling
Joined: Aug 2019
Posts: 41
Likes: 0
Yeah I’m not sure if there’s any significance to that module info or not. The TSB states it needs to have calibration version 75.03A or newer. Our scan tool at work shows the software version and a few other things so I can use that for comparison if needed.
If your scan tool shows throttle plate angle at all, it will be in live data. Don’t be fooled by how it’s listed either - there can be multiple PIDS for it listed in different ways - it can be shown as volts, degrees, or percentage and they can be several lines apart (example, near the top of the list it might say electronic throttle signal 0.5 volts but closer to the bottom it might say throttle plate position 12%) so thoroughly read through the full list of data to see if there’s more than one PID.
If it helps, Ford lists the PID as ETC_TRIM in the TSB.
If your scan tool shows throttle plate angle at all, it will be in live data. Don’t be fooled by how it’s listed either - there can be multiple PIDS for it listed in different ways - it can be shown as volts, degrees, or percentage and they can be several lines apart (example, near the top of the list it might say electronic throttle signal 0.5 volts but closer to the bottom it might say throttle plate position 12%) so thoroughly read through the full list of data to see if there’s more than one PID.
If it helps, Ford lists the PID as ETC_TRIM in the TSB.
Thread Starter
|
5th Wheeling
Joined: Aug 2019
Posts: 41
Likes: 0
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Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
I can’t see the smoke.
Takes a good bright light so help see small smoke leaks.
Could you put a circle around the smoke in your picture?
Shouldn’t there be a clamp around the accordion pipe where it connects to the square air box?
When you do the smoke test, pull the air filter off and place a vinyl glove over the opening to keep smoke from exiting into the air filter and it’s housing.
Takes a good bright light so help see small smoke leaks.
Could you put a circle around the smoke in your picture?
Shouldn’t there be a clamp around the accordion pipe where it connects to the square air box?
When you do the smoke test, pull the air filter off and place a vinyl glove over the opening to keep smoke from exiting into the air filter and it’s housing.
Thread Starter
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5th Wheeling
Joined: Aug 2019
Posts: 41
Likes: 0
I can’t see the smoke.
Takes a good bright light so help see small smoke leaks.
Could you put a circle around the smoke in your picture?
Shouldn’t there be a clamp around the accordion pipe where it connects to the square air box?
When you do the smoke test, pull the air filter off and place a vinyl glove over the opening to keep smoke from exiting into the air filter and it’s housing.
Takes a good bright light so help see small smoke leaks.
Could you put a circle around the smoke in your picture?
Shouldn’t there be a clamp around the accordion pipe where it connects to the square air box?
When you do the smoke test, pull the air filter off and place a vinyl glove over the opening to keep smoke from exiting into the air filter and it’s housing.
Logistics Pro
Joined: Dec 2003
Posts: 3,777
Likes: 863
From: Foothills of NC
There is a special made clamp that's missing where the intake tube attaches to the flex tube. One off any 4.6 Crown Vic, Grand Marquis, ect should work. Put some silicone around the fitting for the first leak. The leak at the MAF looks like the MAF is not seated all the way down. Could put some sealer there and push all the way down also.
I don't think this is your idle problem, but could help in higher RPM use.
I don't think this is your idle problem, but could help in higher RPM use.
Thread Starter
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5th Wheeling
Joined: Aug 2019
Posts: 41
Likes: 0
Yeah I didn't think those leaks was my rough idle problem either, but thought I'd show everyone here just to confirm. Yes I installed A brand new Motorcraft PCV valve when I did the intake and plenum gaskets, because the plenum had about 1/2 to 3/4 inch of oil in the bottom.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
The first picture in THIS post where you are pointing to a smoke leak, that is the fresh air intake to the PCV system where it picks up filtered air. A leak there will allow air into the intake by way of the crankcase without being seen by the MAF.
The second picture in this post looks like the plug up for the MAF. Again, a leak there is probably not going through the MAF.
I have to disagree with @yardbird, in that these small leaks will effect idle, but will have very little effect at higher RPMs in relation to the amount of air flowing through the MAF.
When you did your smoke test, did you look for smoke at the base of the dip stick tube where it enters the engine block?
Thread Starter
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5th Wheeling
Joined: Aug 2019
Posts: 41
Likes: 0
In your very first picture from a few posts ago, what do you call that “box” on the left edge of the picture that the “accordion” pipe is attached to (where the clamp is missing)?
The first picture in THIS post where you are pointing to a smoke leak, that is the fresh air intake to the PCV system where it picks up filtered air. A leak there will allow air into the intake by way of the crankcase without being seen by the MAF.
The second picture in this post looks like the plug up for the MAF. Again, a leak there is probably not going through the MAF.
I have to disagree with @yardbird, in that these small leaks will effect idle, but will have very little effect at higher RPMs in relation to the amount of air flowing through the MAF.
When you did your smoke test, did you look for smoke at the base of the dip stick tube where it enters the engine block?
The first picture in THIS post where you are pointing to a smoke leak, that is the fresh air intake to the PCV system where it picks up filtered air. A leak there will allow air into the intake by way of the crankcase without being seen by the MAF.
The second picture in this post looks like the plug up for the MAF. Again, a leak there is probably not going through the MAF.
I have to disagree with @yardbird, in that these small leaks will effect idle, but will have very little effect at higher RPMs in relation to the amount of air flowing through the MAF.
When you did your smoke test, did you look for smoke at the base of the dip stick tube where it enters the engine block?
