Wont idle on its own and loses power on inclines and when engine is warm
SOURCE: Reduced power below 4000 RPM
The main relay also controls the transmission and will cause an intermittent interruption of power and indicates its going bad. about a $60.00 replacement cost. the relay is located under left side of dash.
SOURCE: idle surging
Consider replacing the rotary idle air control valve, and clean your throttle body.
SOURCE: I have a 1995 Honda Civic. When driving up hills
Check spark plugs and all related cables, fuel hoses, fuel filter (change if black but make sure lines and fuel tank are clean first), and air filter. If blank spots are experienced when power is lost completely then firing of spark plugs may be the issue. Possibly also related to insufficient fuel reaching combustion chamber. Available for more consulation after you do through the above recommended basic checks.
SOURCE: code p1259
A "P1259" code refers to "Vtec (Variable valve Timing and lift Electronic Control) System malfunction. It sounds like the Vtec filter screens may be clogged. Disconnect the negative battery terminal. (This will prevent electrical current from going where you don't want it and will reset the CEL. The Vtec solenoid valve is located at the right rear corner of the cylinder head. The Vtec valve is held on with 3- 10mm bolts. Also there is an electical connector that you will want to remove first.
When you take off the solenoid valve, check the valve screens to see if they are clogged. Clean off any crud you find on the filter screens. A good quality spray carburator cleaner works well. If the screens are too yuckked-up to clean, just get a new one. While you are in there, you might want to also check to see that the plunger on the solenoid itself moves freely. If it does'nt, replace it too.
After you put everything back together, do an oil and filter change. Use a high quality oil of the viscosity recommended by the car manufacturer.
Good luck and God Bless.
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