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F150 rich idle

I have a ford 300 straight six that runs rich and wont idle can you tell me why?

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  • 65 Answers

Could be the air filter try with out or a new one.

Posted on Feb 09, 2014

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Posted on Jan 02, 2017

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SOURCE: 1984 ford f150 running erratic.

Check and adjust your choke accordingly, also since you have given it a tune up you should adjust your timing if it needs adjustment. Also check for any vacuum leaks. As for the exhaust leak I would look along the exhaust manifold and then along the exhaust pipe under the cab, check where the exhaust manifold and the exhaust pipe connect as there should be a donut or flange in there and it could be deteriorating. Good luck and remember to rate all the solutions you get, thanx.

Posted on Oct 31, 2008

  • 36 Answers

SOURCE: six cyl high idle. already replaced tps

the problem could also be caused by a bad mass airflow sensor. you may be able to get one cheap at a junk yard.

Posted on Apr 15, 2009

  • 171 Answers

SOURCE: 1985 ford F150 is running very rich. (choke is

When you say it's destroying the air filter---do you mean it's all sooted up ?? I am assuming that what you mean.
Try disconnecting the vacuum line at the egr valve and see if that helps.
But it sounds more like a plugged up exhaust system.Try disconnecting or looosing the flange before the cataylic convertor and then see how it runs.

Posted on Nov 20, 2009

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When you say it's destroying the air filter---do you mean it's all sooted up ?? I am assuming that what you mean.
Try disconnecting the vacuum line at the egr valve and see if that helps.
But it sounds more like a plugged up exhaust system.Try disconnecting or looosing the flange before the cataylic convertor and then see how it runs.

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