Engine power loss?

Tiny
ACE1991-2009
  • MEMBER
  • 1999 FORD F-250
  • V8
  • 4WD
  • AUTOMATIC
  • 198,000 MILES
I have a 1999 ford f-250 with 198000 miles on it, when you drive down the road it bogs down and is really slow. I already replaced the fuel pump, fuel filter, and cat converter. I've checked all 8 coils and they are good, and the plugs are in great shape. I also noticed that when you floor it the engine misses and loses power and then wont go over 3000 rpm, it kicks down every time I try to rev it. Check engine light is on so I checked it out and only one code came back, it was the EGR vale code. Would that be causing this problem? What do you think will solve this power loss because it is very apparent and its driving me crazy!
Sunday, June 1st, 2008 AT 2:52 AM

44 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
There are a few EGR codes, but if it sticks open it can cause your problems. Can you post the code?

This guide can help us fix it

https://www.2carpros.com/articles/engine-has-low-power-output

Please run down this guide and report back.
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Sunday, June 1st, 2008 AT 6:21 AM
Tiny
ACE1991-2009
  • MEMBER
  • 5 POSTS
I cant remember the EGR code but it did say excessive flow. Where is the EGR valve located, and is there anyway I can check it before buying a new one for $80.00?
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Sunday, June 1st, 2008 AT 12:04 PM
Tiny
ACE1991-2009
  • MEMBER
  • 5 POSTS
Is there anyway to clean the EGR valve or fix it without buying a new one so I can make sure that is the problem?
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Sunday, June 1st, 2008 AT 2:15 PM
Tiny
ACE1991-2009
  • MEMBER
  • 5 POSTS
I also notice the transmission doesn't shift right, i'm not sure if this problem is related to the power loss or not
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Sunday, June 1st, 2008 AT 2:18 PM
Tiny
ACE1991-2009
  • MEMBER
  • 5 POSTS
Would vacuum leaks have anything to do with these two problems, I checked for leaks but may have missed one.
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Sunday, June 1st, 2008 AT 2:20 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody
Use a vauum tester and see if the EGR open hold vauum, and closes. Its on the back side of the engine, you want to look at the solinoid too!


https://www.2carpros.com/forum/automotive_pictures/62217_EVR_4.jpg


This controls the opening and closing of the EGR, its the EVR
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Monday, June 2nd, 2008 AT 5:27 AM
Tiny
GRUNK
  • MEMBER
  • 2 POSTS
  • 1999 FORD F-250
  • 199 MILES
1999 f-250 SD 4x4 V10. After having the 4R100 Trans and 273 T case repaired I cant keep it running. It runs great cold after warm up it bogs down when you give it the gas. Take it out of gear and rev it up does great put it in gear and give it the gas but it falters. I have replaced the mass air flow sensor, tps, cam sensor, air filter. No codes are found.I had this scanned at RUSH FORD of Denver they came up with these codes P0102 and P0113
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+2
Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
One is intake air temp and the other maf high voltage. Look for a blockage in duct work or a broken duct or broken rubber piece to vavle covers. Also try cleaning maf with choke cleaner.
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
GRUNK
  • MEMBER
  • 2 POSTS
I will check for those. My fuel psi 32-40 my vac is 18-20. I have check for blockage in the exhaust
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Also try to clean the throttle plate and iac valve with choke cleaner. They gum up and especially effect running at idle or coming to a stop
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
JOHNJOSEPHSON
  • MEMBER
  • 3 POSTS
  • 1999 FORD F-250
  • V8
  • 4WD
  • AUTOMATIC
  • 73,000 MILES
I have 2008 f250 superduty truck. Wont go over 3 thousand rpm. Put it on tester and got po141 code. Oxygen sensor. I changed upper and lower. Still wont run right
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
JOHNJOSEPHSON
  • MEMBER
  • 3 POSTS
Its a 2008
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the mass airflow sensor and throttle position sensor-
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
JOHNJOSEPHSON
  • MEMBER
  • 3 POSTS
How come no code comes up? Where are they?
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
E_AMADOR956
  • MEMBER
  • 12 POSTS
  • 1999 FORD F-250
  • V8
  • 2WD
  • AUTOMATIC
  • 236,178 MILES
I have a 1999 7.3 engine that has a rough idle dtc retrived is p1211 almost everytime. Engine is rough at idle but engine works fine as rpm increases. I have cheked icp and ipr ok. As engine is driven for about 20 miles engine completely dies and wont start for about 30 mins to an hour. I notice that when this happens oil gauge in instrument cluster wont move at all stays at the bottom. I also cheked oil resevoir ok oil is present. Turbo has been replaced due to internal oil leak and problem appeared after this also vehicle has no power and is smoking white exessivle vehicle has been driven for more than 20 miles already. Oil change has already been perform. Any advice?
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
TECH1FORD
  • MEMBER
  • 102 POSTS
You will need to deal with the no start first. When it dies hot and you get that code it is loosing high pressure oil. You will need to monitor your high oil presure with a scanner it needs 500 psi to start. If you are not getting that block off the left head and test if still no pressure hook up and block off the right side if no pressure block off both if no pressure replace high pressure pump and ipr. If you do get pressure when blocking off the left or right head the problem is in that head. With the rough idle I would be thinking that you need a new injector they can dump oil pressure causeing the no start
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Don't always rely on the computer to pop a code to give you a starting point-You need a repair manual to do the testing on these sensor-
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
ONAROLL1971
  • MEMBER
  • 2 POSTS
  • 1999 FORD F-250
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
My check engine light comes on for a few seconds while I am driving or while stopped in drive. While it is on, when you step on the gas, the motor will not rev up or go. It still runs but will not go anywhere. This happens only while the engine light is on for a few seconds.
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
You need to pull the diagnostic codes and post them.

https://www.2carpros.com/kpages/first_things.htm
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)
Tiny
JCASTANEDA71
  • MEMBER
  • 1 POST
  • 1999 FORD F-250
  • 7.3L
  • V8
  • TURBO
  • 2WD
  • MANUAL
  • 262,000 MILES
When I get on steady speed it loses power then increase power. I think is my turbo
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Wednesday, July 29th, 2020 AT 12:51 PM (Merged)

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