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- Joined
- May 18, 2008
- Messages
- 1,517
- Vehicle Year
- 92 & 83 project
- Engine
- Transmission
- Automatic
Hey guys, I finally got around to finishing my 4.0 build up and placing it into the ol'92. Background info:
new: all bearings - timing chain - gaskets - all seals - lifters - filters - thermastat - plugs - push rods (5.5" custom) - rings - cam 410
cleaned: injectors - heads P&P - block (A OK) - intakes & exhuast - reseated old valves new seals - pistons. (you guys know the drill)....
After firing up this motor she purred like a top. however, runs rich.
Problem - still breaking in the motor, and I notice the rich gas smell and she is expelling loads of unburnt fuel (fuel mileage is uhhhgly) had Angie following me and I accelerated going up a hill and she had no prob seeing black exhuast from my pipe. (stock exhuast no heads or special tunes)
My thinking - checked. vacuum lines (seem ok) o2 sensor (seems ok) from doing reading timing should be comp controlled however, i am a bit confused about 10degrees btdc, for when i built her up i went tdc all the way. if anyone may be able to explain this a bit more i would be thankful. It almost seems like the motor is running a bit out of time if this is possible with the computer managing the system. (yes i double checked firing order)
anyone have this prob before? and is it a chip or some fine tweaking that needs to be done now?
thanks
new: all bearings - timing chain - gaskets - all seals - lifters - filters - thermastat - plugs - push rods (5.5" custom) - rings - cam 410
cleaned: injectors - heads P&P - block (A OK) - intakes & exhuast - reseated old valves new seals - pistons. (you guys know the drill)....
After firing up this motor she purred like a top. however, runs rich.
Problem - still breaking in the motor, and I notice the rich gas smell and she is expelling loads of unburnt fuel (fuel mileage is uhhhgly) had Angie following me and I accelerated going up a hill and she had no prob seeing black exhuast from my pipe. (stock exhuast no heads or special tunes)
My thinking - checked. vacuum lines (seem ok) o2 sensor (seems ok) from doing reading timing should be comp controlled however, i am a bit confused about 10degrees btdc, for when i built her up i went tdc all the way. if anyone may be able to explain this a bit more i would be thankful. It almost seems like the motor is running a bit out of time if this is possible with the computer managing the system. (yes i double checked firing order)
anyone have this prob before? and is it a chip or some fine tweaking that needs to be done now?
thanks
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