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84LX89GT · 02-14-2003, 08:13 PM

It sounds like since you just replaced your u joints that is the problem for the vibration, if they're offcenter at all it will cause a vibration.

As for 3 miles per gallon, something is causing your computer to default to rich, i'd check the wire terminals in the oxygen sensors to make sure they're not damaged, i'd also try and pull any engine codes from the processor, and try spraying some brake/carb cleaner around the engine at sealing surfaces/vacuum lines to see if it starts to run better (for a leak). Also check all vacuum lines from the big vacuum tree...does your heater/air conditioning system work right, if it does the vacuum from the tree is good. It sounds like you have a MAJOR vacuum leak or you lost a primary sensor. double check anything to may have intentionally or unintentionally unplugged.

Good luck, hope this helped.

02-14-2003, 08:13 PM	#7
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	It sounds like since you just replaced your u joints that is the problem for the vibration, if they're offcenter at all it will cause a vibration. As for 3 miles per gallon, something is causing your computer to default to rich, i'd check the wire terminals in the oxygen sensors to make sure they're not damaged, i'd also try and pull any engine codes from the processor, and try spraying some brake/carb cleaner around the engine at sealing surfaces/vacuum lines to see if it starts to run better (for a leak). Also check all vacuum lines from the big vacuum tree...does your heater/air conditioning system work right, if it does the vacuum from the tree is good. It sounds like you have a MAJOR vacuum leak or you lost a primary sensor. double check anything to may have intentionally or unintentionally unplugged. Good luck, hope this helped. __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)