v-10 surging
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v-10 surging
i have a 99 f-250 with a v-10. the motor surges up and down at idle. but runs fine when driving. cant remember the code it has, has to do with running lean. tried cleaning the egr valve, and tested it but seems to be working fine.the engine has 140,000 on it. any ideas?
Post Fiend
Joined: Mar 2003
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From: Sarnia, Ontario, CANADA!
Hi and welcome to FTE! Be sure to read this to help you around this site: https://www.ford-trucks.com/forums/s...d.php?t=300691 There are also State, Provincial and International Chapters located near the bottom of the main forum page.
Thread moved to V10 forum.
See ya on the boards!
-Matt
Thread moved to V10 forum.
See ya on the boards!
-Matt
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 421
From: Long Island USA
Originally Posted by 4S FED
MAF sensor could be going bad, too...
Usually, they don't go bad, they just get dirty and drive the computer nuts.
I've also found out that the bad shifting I was getting from my 4R100 WENT AWAY after I cleaned the MAF - without a computer reset or DTC clear (test flags reset). I was beginning to think it was going south on me because of it's deterioration over time... it wasn't a tranny problem, it was the MAF - I just wonder what could have happened with the tranny shifting like that if I was towing heavy.
Anyway, back to the topic of this thread: Sounds like the IAC - the computer can't regulate the air going past the throttle body (to keep the idle steady) and instead uses timing advance and mixture to regulate that.
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Freshman User
Joined: May 2004
Posts: 25
Likes: 0
From: Corona CA
Guys,
Logged on this morning to search for help on the exact same issue and look what I found! My 99 F350 V10 with 118,000 will surge from 2000rpm and drop back down to around 800 several times while idiling but does seem to drive ok otherwise. The check engine light is on and the code that I read this morning with the Actron scanner is P0171 and P0174, it states something like a lean condition on both banks 1 and 2, does this sound like the IAC as you stated? if so what is a test that I can run to determine if the sensor is bad before proceeding. Is there a voltage test I can run on the sensor? I ask this because I believe the dealer repaced the IAC last year when I was experiencing detonation issues, which by the way I still have!!!.
Thanks for the help.
Logged on this morning to search for help on the exact same issue and look what I found! My 99 F350 V10 with 118,000 will surge from 2000rpm and drop back down to around 800 several times while idiling but does seem to drive ok otherwise. The check engine light is on and the code that I read this morning with the Actron scanner is P0171 and P0174, it states something like a lean condition on both banks 1 and 2, does this sound like the IAC as you stated? if so what is a test that I can run to determine if the sensor is bad before proceeding. Is there a voltage test I can run on the sensor? I ask this because I believe the dealer repaced the IAC last year when I was experiencing detonation issues, which by the way I still have!!!.
Thanks for the help.
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Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
99,yours is a different problem,the above poster had no chk engine light! which is common with the IAC valve.
Yours could be
DPFE sensor or egr valve not not working properly
or intake manifold gaskets
I would start a new post !
Rich
Yours could be
DPFE sensor or egr valve not not working properly
or intake manifold gaskets
I would start a new post !
Rich
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 421
From: Long Island USA
Originally Posted by 99F350DUALLYV10
Guys,
Logged on this morning to search for help on the exact same issue and look what I found! My 99 F350 V10 with 118,000 will surge from 2000rpm and drop back down to around 800 several times while idiling but does seem to drive ok otherwise. The check engine light is on and the code that I read this morning with the Actron scanner is P0171 and P0174, it states something like a lean condition on both banks 1 and 2, does this sound like the IAC as you stated? if so what is a test that I can run to determine if the sensor is bad before proceeding. Is there a voltage test I can run on the sensor? I ask this because I believe the dealer repaced the IAC last year when I was experiencing detonation issues, which by the way I still have!!!.
Thanks for the help.
Logged on this morning to search for help on the exact same issue and look what I found! My 99 F350 V10 with 118,000 will surge from 2000rpm and drop back down to around 800 several times while idiling but does seem to drive ok otherwise. The check engine light is on and the code that I read this morning with the Actron scanner is P0171 and P0174, it states something like a lean condition on both banks 1 and 2, does this sound like the IAC as you stated? if so what is a test that I can run to determine if the sensor is bad before proceeding. Is there a voltage test I can run on the sensor? I ask this because I believe the dealer repaced the IAC last year when I was experiencing detonation issues, which by the way I still have!!!.
Thanks for the help.
Clean it first, before doing anything else.
Freshman User
Joined: May 2004
Posts: 25
Likes: 0
From: Corona CA
Krewat & Forty,
Thanks a bunch for the advise, I also did a little more searcing on the forums using the codes and I found that it may be a dirty MAF, bad PCV valve or a vacuum leak at the elbow(s) or hose on the throttle body. I will check everything out tonight and let you know.
I just love the forums!!
Thanks a bunch for the advise, I also did a little more searcing on the forums using the codes and I found that it may be a dirty MAF, bad PCV valve or a vacuum leak at the elbow(s) or hose on the throttle body. I will check everything out tonight and let you know.
I just love the forums!!
Will do. I'm hoping it this simple
Posting Guru
Joined: Mar 2002
Posts: 2,245
Likes: 16
From: Vancouver Wash USA
Originally Posted by my99f250
i have a 99 f-250 with a v-10. the motor surges up and down at idle. but runs fine when driving. cant remember the code it has, has to do with running lean. tried cleaning the egr valve, and tested it but seems to be working fine.the engine has 140,000 on it. any ideas?
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
Originally Posted by ken04
this may sound like a lame question, but is your defroster on when this happens ? It does run the a/c even when the defrost is on, do dehumidify the vent-air.
But not this time.
Art I completely forgot that hose also and the maf ! good catch
Rich