smog pump question?
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Junior User
Joined: Jun 2010
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smog pump question?
How do i bypass the smog pump from a 89 f150 4wd with 302? Do i just get a shorter belt and pull all of it out? To my knowledge its just dead weight. The tube from the exhaust has been sealed off. I'm assuming that its dead weight b/c of this. Is there something I'm missing? The reason why I'm Thinking of taking it off is b/c its squeaking (chirping sound) when the motor decelerates. Does anyone know the size of the belt i would need? Is this even a good idea, and no i don't have to worry about emmisions testing.
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 21
From: Caracas, Venezuela
A new Thermactor will set you back around $30, which isn't much. You won't gain anything by bypassing it and will probably lose 1-2 mpg on the proccess, as i did (i eleminated mine because i couldn't find a new one in my country).
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Junior User
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Ok i checked some things with a stethescope, smog pump is ok, crankshaft, power steering, alternato and compressor are all ok. Could it be the water pump? While it was running i made the tensioner tighten up ( not the smartest thing) butim running out of ideas!!!! Anyone have any suggestions?
Laughing Gas
Joined: Dec 2007
Posts: 959
Likes: 8
From: Imperial, MO
It could be the water pump, but check your tensioner and idler with the stethescope as well. Bearing failure on those pulleys is relatively common.
As far as bypassing the smog pump is concerned, here are a couple threads that outline the removal of the thermactor system:
https://www.ford-trucks.com/forums/1...-question.html
https://www.ford-trucks.com/forums/1...mp-delete.html
As far as bypassing the smog pump is concerned, here are a couple threads that outline the removal of the thermactor system:
https://www.ford-trucks.com/forums/1...-question.html
https://www.ford-trucks.com/forums/1...mp-delete.html
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