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Guest
Anonymous Poster
jrwilliams14@rogers.com
Apr 21, 2009, 12:23 PM
Post #1 of 4
(2539 views)
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f150, 4x4, 302, 1995, 210000kms
Ive been getting poor milage with this truck since I bought it and noone can ever find the problem. The other day I started it when it was already warm and noticed it revd strange. It would idle at 600 shoot up to 1400 and back down to 600. When I put it in drive this stops and truck drives fine. Im wondering if this problem is maybe associated with the poor fuel milage. Also I notice its kinda sluggish, Once Im up to the speed I want it'll hold but as soon as theres a small incline the truck needs to drop a gear. For a 302 I would expect more power. Truck doesnt burn any oil and has always been well maintaind. Any suggestions would be helpful.
Thanks in advance.
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flgmtech1
User
Apr 22, 2009, 3:32 PM
Post #2 of 4
(2530 views)
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Using a Vacuum gauge, read what the engine vacuum is at idle, and off idle, it sounds like you have an issue with engine vacuum.
Check all vacuum lines and also at the base of the intake and the throttle body or Carb base plate in this case.
Also, engine compression test, or cylinder leak down test, look for issues with rings, or worn valve guide seals or worn seats.
Start with the basics, check everything that can cause a loss of pressure or vacuum with this engine.
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Loren Champlain Sr
Veteran
/ Moderator
Apr 22, 2009, 3:42 PM
Post #3 of 4
(2529 views)
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To add to flgmtech's suggestions; Check coolant level. (CTS must be immersed in coolant, can cause surge at idle) With engine off, pull off vacuum hose to pressure regulator to see if any fuel present. (should be none)
Fuel pressure test would be helpful. Restricted or plugged fuel filter possible. The vacuum readings will tell if restricted exhaust. Most parts stores will retrieve any stored codes. If you can, post them here.
Loren
SW Washington
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Rick Dempsey
User
Apr 23, 2009, 9:12 AM
Post #4 of 4
(2517 views)
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I have encounterd this problem on all types of vehicles. If none of the above suggestions check out have the TPS checked out. The problem should be constant and not intermitten. Usually removing the connector fixes the problem,but,fuel economy will suffer dramatically. Also, a fuel pressure check to determine if the fuel pressure regulator has failed. A failed one will have you seeing your fuel gauge drop like a stone between fillups.
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