Engine Losing Power Question
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Freshman User
Joined: Nov 2002
Posts: 45
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From: Mckinney, TX
Engine Losing Power Question
Hi. Got a question.
My truck is acting like it is losing power; but from the exhaust system not the motor, if that makes any sense. I do have an aftermarket exhaust (flowmaster 40 cat-back). The exhaust makes like a poping sound without the poping and it feels like the backpressure, or lack there of, causes the motor to lose power.
Now it would seem like it is something to do with the polution sensors, just not sure which one. Someone mentioned the EGR valve. Could be, costs $100 so I would like to see if that would be the general opinion. Then I need to figure out where it is so I can replace it. I have not seen a Chilton's book for my truck yet.
One other thing, I do not drive it alot only on weekends. So it does sit a lot. When it seems to be driven for a long time, 2+ days, the problem appears to go away.
Thanks.
My truck is acting like it is losing power; but from the exhaust system not the motor, if that makes any sense. I do have an aftermarket exhaust (flowmaster 40 cat-back). The exhaust makes like a poping sound without the poping and it feels like the backpressure, or lack there of, causes the motor to lose power.
Now it would seem like it is something to do with the polution sensors, just not sure which one. Someone mentioned the EGR valve. Could be, costs $100 so I would like to see if that would be the general opinion. Then I need to figure out where it is so I can replace it. I have not seen a Chilton's book for my truck yet.
One other thing, I do not drive it alot only on weekends. So it does sit a lot. When it seems to be driven for a long time, 2+ days, the problem appears to go away.
Thanks.
Senior User
Joined: Oct 2002
Posts: 437
Likes: 3
From: Fayetteville (Atlanta) GA
I don't believe a 2001 even has a EGR valve, only thought 99's had them. I have a 2000 and no EGR valve. I could be wrong maybe someone else will jump in. If you truck sits for long period near a lake, ocean etc, you may have moisture ( condensation ) building up inside your exhaust system. Does it vent a white smoke when up to operating temp after sitting for a long period. This may explain why it runs OK after several days. Also check and see if you feel an abnormal amount of heat build up under the hood. Mine did this when the cat was clogged.
Good luck ..let us know how things come out.
ON EDIT: Disregard comment on EGR Valves. I had V-10's on my mind, not 5.4's. Sorry........
Mark
Good luck ..let us know how things come out.
ON EDIT: Disregard comment on EGR Valves. I had V-10's on my mind, not 5.4's. Sorry........
Mark
Last edited by GAV10; Oct 16, 2003 at 11:01 AM.
Thread Starter
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Freshman User
Joined: Nov 2002
Posts: 45
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From: Mckinney, TX
Accordign to fordpartonline.com I can get one for $100. So they think I do; not that I do not beleive you. I am thinking about the CAT as well. Not sure how to fix it if it is that.. Those are more than $100.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
If you bought your truck in MA it has an EGR. MA and some other states sell trucks that meet CA emissions.
If you really think that the EGR is the culprit then take it to your dealer. Emission stuff has a much longer warranty than your standard warranty. Bottom line is that your emission stuff is still under warranty.
However, if the problem really is your EGR it would have thrown the Check Engine light.
When was the last time you changed your fuel filter? If you haven't, change it first.
If you really think that the EGR is the culprit then take it to your dealer. Emission stuff has a much longer warranty than your standard warranty. Bottom line is that your emission stuff is still under warranty.
However, if the problem really is your EGR it would have thrown the Check Engine light.
When was the last time you changed your fuel filter? If you haven't, change it first.
Thread Starter
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Freshman User
Joined: Nov 2002
Posts: 45
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From: Mckinney, TX
Thanks for the info. I changed the fuel filter because that is the first thing I thought of.... No check engine light. 
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Post Fiend
Joined: Jan 2002
Posts: 5,859
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From: USA
How about your air cleaner!
Also have the truck scanned to see if all things are working properly. Run a capture mode on the truck with the scanner .It will tell you alot of things
proper fuel mixtures ,02 sensors,etc...
Maybe your gas is becoming stale after sitting !
Rich
Also have the truck scanned to see if all things are working properly. Run a capture mode on the truck with the scanner .It will tell you alot of things
proper fuel mixtures ,02 sensors,etc...
Maybe your gas is becoming stale after sitting !
Rich
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Thread Starter
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Freshman User
Joined: Nov 2002
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From: Mckinney, TX
just cleaned the K&N filter about 2 weeks ago. Problem was happening before as well.
Yeah I guess I better just go to the dealership and have them run the computer on it. That is a possiblity though about the gas. Thanks
Yeah I guess I better just go to the dealership and have them run the computer on it. That is a possiblity though about the gas. Thanks
Senior User
Joined: Feb 2003
Posts: 420
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From: Ohio
This may sound Stupid.....BUT ---
The FM mufflers ARE DIRECTIONAL.....
In other words, they can be mounted RIGHT, or BACKWARDS; They all come with a sticker the says something like
FLOW DIRECTION -------->
and need to be put on that way.
Have you checked that?? They are flow checked and calibrated for the directional baffles inside of them. Flowing in reverse, the pressure drop is much higher from a gas dynamics standpoint.
See if you can still locate the sticker, if it hasn't burned off, or was removed by the installer.
When mine was installed, they were on there way to mounting it backwards, when i asked "what's that sticker for?"
The answer.... "oh wow, huh....huh....huh"
Given your symptoms.....sounds plausable.
Could be...
The FM mufflers ARE DIRECTIONAL.....
In other words, they can be mounted RIGHT, or BACKWARDS; They all come with a sticker the says something like
FLOW DIRECTION -------->
and need to be put on that way.
Have you checked that?? They are flow checked and calibrated for the directional baffles inside of them. Flowing in reverse, the pressure drop is much higher from a gas dynamics standpoint.
See if you can still locate the sticker, if it hasn't burned off, or was removed by the installer.
When mine was installed, they were on there way to mounting it backwards, when i asked "what's that sticker for?"
The answer.... "oh wow, huh....huh....huh"
Given your symptoms.....sounds plausable.
Could be...
Last edited by Kraut; Oct 16, 2003 at 07:26 PM.
Senior User
Joined: Feb 2003
Posts: 158
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From: Hornbeck, LA
Most Flowmasters have an "Flow---->" or "inlet" emobossed into the metal on them. And and most applications....the inlet is usually a 1/2 inch bigger but not always!!! But generally even on same size inlet outlet the inlet has a wider flange.
Have a nice day!!
Have a nice day!!
Thread Starter
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Freshman User
Joined: Nov 2002
Posts: 45
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From: Mckinney, TX
Very interesting. But the truck ran fine for a month or so after the exhaust was put in (detail did not mention sorry). I did drive it one weekend for the whole weekend and by later Sunday it was running just fine. So it seems to be that after running it awhile it clears up whatever the problem is. (I will check the muffler direction tomorrow morning though, just in case)