very bad MPG
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very bad MPG
i have an 87 v8 305 tpi. is 11 mpg city a normal thing? i know i have a bad o2 sensor and need new spark plugs and wires, but would these three things effect fuel economy but a lot or a little?
Supreme Member
Joined: Dec 2012
Posts: 1,356
Likes: 15
From: northern VA
Car: 88 Sport Coupe Camaro
Engine: V6 2.8
Transmission: Borg-Warner T-5
Axle/Gears: RPO/GU6: 3.42
Re: very bad MPG
CHECK:
· Engine thermostat for faulty part (always open) or for wrongheat range.
· Fuel Pressure.
· Owner's driving habits.
· Is A/C"ON" full time (Defroster mode ..ON)?
· Are tires at correct pressure?
· Are excessively heavy loads being carried?
· Is acceleration too much, too often
· Perform Diagnostic Circuit Check (pull codes).
· Check air cleaner element filter for dirt or being plugged.
· Visually and physically) check:
o Vacuum hoses for splits, kinks, and proper connections
o Ignition wires for cracking, hardness, and proper connections.
· Check ignition timing
· Remove spark plugs. Check for cracks, wear, Improper gap,burned electrodes or heavy deposits.
· Check compression.
· Check Transmission Converter Clutch for proper operation - Use"Scan" tool if available
· Check for dragging brakes.
· Check for exhaust system restriction.
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
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