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Smoke coming from tail pipe

1991 FORD F-150
145,000 MILES
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STEVEN L JONES
  • MEMBER
  • 1 POST
well when i give it gas it spits and sputters and a little blue smoke comes from tail pipe. i have changed plugs, wires and the TPS and changed the MAP sensor. I have done a self EEC V test, but i can not fix it.
Aug 10, 2013 at 10:22 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Have you checked for vacuum leaks? Please go over this guide

https://www.2carpros.com/articles/blue-smoke-from-engines-exhaust

Please go over this guide and get back to us.
Aug 10, 2013 at 1:30 PM
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MASTERTECH13
  • MEMBER
  • 3 POSTS
Blue smoke means your burning oil. You have not left very much information to go off but it is a fairly safe bet.

This could be coming from several different areas, such as worn piston rings or worn valve guide seals. Have you done a compression or leak down test of any kind?
Aug 10, 2013 at 1:32 PM
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RANDY JAMES
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  • 1 POST
yes i have.forgot to add this it does not smoke until it starts sputtering really bad and the smoke smeels like the truck is over loading with gas.
Aug 10, 2013 at 5:48 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Randy,

Is the smoke black? I would check the fuel pressure regulator vacuum line and if there is fuel present the regulator is bad and needs replacement. Check out the images (below). Let us know how it goes
Image (Click to enlarge)
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Aug 11, 2013 at 1:55 PM
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