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britor305
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Vehicle: 2rangers,2 f150s
Joined: Jul 2009
Member # 5775
From: Palm Bay florida
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Carnival Freak
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Vehicle: 2007 2500HD, 2006 KTM 450
Joined: Apr 2007
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From: South OC CA
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 Posted
- July 5 : 11:49p
| | How about the Oxygen Sensor? | |
britor305
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Vehicle: 2rangers,2 f150s
Joined: Jul 2009
Member # 5775
From: Palm Bay florida
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Posted
- July 5 : 11:51p
| | not yet, is there any way to check that? i figured the o2 sensor would trigger check engine code. | |
Tom in Tacoma
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From: Over yonder WA
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Posted
- July 6 : 2:38p
| I'll wager a fair amount of money that you've got a vacuum leak somewhere. They often show themselves by a really rough idle. Might even get a bit better as the engine warms up?
Check out all the vacuum lines as well as listening for a whistling sound around the intake manifold, throttle body and heads.
I'll be waiting here to see if I was right. Go on now - go check! | |
Mort
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Vehicle: 2009 F-150 XL
Joined: May 2005
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From: Mortville WA
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Posted
- July 7 : 7:54a
| | I had to say it, but Tom is probably right. Bad thing is, those things have about eight miles of vacuum hose. | |
Tom in Tacoma
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britor305
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Vehicle: 2rangers,2 f150s
Joined: Jul 2009
Member # 5775
From: Palm Bay florida
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Posted
- July 7 : 1:20p
| | i had a buddy check and he said vacuum is right on . i looked for leaks . sooooo many hoses on this truck but i checked them ALL and nothing . | |
MrSVTGal
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Vehicle: 2000 Ford Expedition
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From: South OC CA
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Posted
- July 8 : 2:44a
| There's a BIG vacuum tree under the upper intake, if you have the intake that sort of folds over to the side (like a 5.0 Mustang, but the other direction, if I remember right). It's easy to have a leak under there that's not obvious. Spray a little WD-40 or carb cleaner in that general area when it's idling rough, and if you have a leak the idle will change (probably smooth out for a moment) as the stuff gets sucked into the intake.
Also, check the big line that runs to the master brake cylinder vacuum reservoir. There's usually a flimsy plastic check valve along with a big fat vacuum line - lots of junctions where you could get a leak.
Have you checked that all the upper and lower intake bolts are at least snug? (none of them get torqued all that much, but when the gaskets shrink with age they can end up 'loose').
MrSVTGal | |
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88 f-150 rough idle - any ideas?
