Fuel Mileage issue?
12-14-2014, 08:42 PM
#1
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Car: 1991 z28 L98 Spec
Engine: 5.7 350 TPI 245\345
Transmission: 700 R4
Axle/Gears: 3.23
Fuel Mileage issue?
Can runs amazingly, only down side is a code 42 that wont go away, will be checking it out tomorrow. Also only gets 13.5 mpg on the interstate?
Any suggestions guys?
Any suggestions guys?
12-15-2014, 08:58 AM
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Car: 1992 Z28 Camaro
Engine: 350 tpi
Transmission: Built 700r4
Axle/Gears: 3:42
Re: Fuel Mileage issue?
The 91-92 camaros had a fuel tank issue that was recalled, but few were fixed. If you smell a strong smell of gas for awhile after filling up, it may have a leak and need to be fixed. Not saying this is your problem, but its something to take a look at.
12-18-2014, 02:58 AM
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Car: 1989 GTA
Engine: 350TPI w/ Speed Density
Transmission: 700r4
Axle/Gears: Borg warner 3.27
Re: Fuel Mileage issue?
Code 42 is related to ignition advance. This could be the main cause of poor mileage. Lack of advance causes an incomplete burn of fuel.
12-24-2014, 08:03 PM
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Car: 1989 GTA
Engine: SuperRam 350
Transmission: Pro Built S/S TH700R4
Axle/Gears: 3.27
Re: Fuel Mileage issue?
If you adjust the base timing, you will get a code 42. Try adjusting the base timing to the factory spec. Then unplug the battery for 5 minutes. Re-connect and see how things go.
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