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Hey guys i have a 87 mustang gt but i just put new motor in. There is a hole on backside of each sylinder that smokes an occasionaly spits fire. My friend said its were smog tubes are supposed to be. All smog system was gone when i got the car. Is there someone who sales block off plates or something to fix my problem. Thanks guys.
 

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find what size the thred on those holes are and go buy a plug for it or just put a bolt in it..
 

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you they cause alot of smoke. EXHAUST comes out of there. I cant remember what size bolt it is but just quess on a bolt until you get it right and screw a bolt in there and it will stop
 

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well let me know if you find out wat size holes those are
 

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it is the same size as one of the bolts on the front that screw on the head...
 

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They are called thermactor plugs, look them up on google to find the size.

you can use a 5/8-11 bolt 3/4" long
 

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possibly, it would be like having a vacuum leak into the EGR system. Your pumping in air instead of exhaust, which would probably cause the computer to throw a code and be confused.
 

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read the sticky at the top of the 5.0 forum page on reseting the idle.
 
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