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P1259 Honda Description
The VTEC system activates the VTEC solenoid valve by command from the powertrain control module (PCM), and it charges/discharges the hydraulic circuit of the VTEC mechanism that is installed in the valve system to switch valve timing between Low and High. The PCM monitors oil pressure conditions in the hydraulic circuit of the VTEC mechanism according to the VTEC oil pressure switch downstream of the VTEC solenoid valve. If there is a disparity between oil pressure condition in the hydraulic circuit that is determined by the PCM command, and the oil pressure condition that is determined by the status of the VTEC oil pressure switch, the system is considered faulty and a DTC is stored.
It could be a bad oil pressure sending unit, valve cover gasket, timing chain cover gasket or oil pan gasket. If there's white smoke coming out of the exhaust it could have a blown head gasket but it's not a common problem with that engine.
remove rocker cover and watch the valves come to the top after each rotation and you will see one or more not come up as high as the others ! compression gauge will tell you which cylinder , a pressure drop tester will tell you how meany valves leak ( with carbs and exhaust removed so you can see and hear which valves ) first test no oil on top of pistons then secound test with oil covering piston top and if any pressures go up then rings are also leaking ! most garages can do this for you !
Check ur EGR valve. It might have been blocked by dried oil or the connection hose is disconnected!
It is a HOSE w/ valve connected into the intake manifold or the air cleaner housing!
Hope that might help u!
You usually don't need to pull the heads. I'm not exactly familiar with that engine but 50% of the time you can get a magnet and pull them out through the valve covers. But to make sure it's the lifters. Let it run until it's warm and remove the valve covers. You at that point should push with your finger on the push rod side of the tappet. If one of them ticks (you will be amazed you just did it with your finger) thats the bad one. However the whole cause of the problem with hydraulic lifter is oil pressure. The 0-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil. Thus lowering oil pressure causing the tick. It is normal for some LIGHT ticking to occur in the 4.8L and some noticeably louder ticking on startup. Good luck!