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I have a 1998 chevy 5.7 votec with 130000 miles whenever I climb any grade the engine starts to lose power and runs a little rough the service engine soon light comes on and blinks, after a few second
Lucas engine cleaner, marvels mystery oil, my mechanic says I don't need valve job
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Determining what caused sudden slack in valves would be of concern to me, as in perhaps, changed oil brand, grade or filter incorrect? Most small block chevy's have adjustable rocker arms. Is that not the case with yours?
I would suggest you run a compression check on this engine and also have the coolant recovery tank tested for the presence of combustion gases with a gas analyzer, any gases would indicate a leaking head gasket. Any engine cylinder that is lower than 5% of the highest reading cylinder in pounds per square inch has a problem like a scored cylinder or leaking intake or exhaust valve seat.
Get a compression tester and find out if you blew a cylinder. You'll need to test all cylinders. Your most likely running on 7 cylinders instead of 8 or 5 instead of 6 if you have the V-6.
I had a similar problem and just happened to unplug the temperature sensor for the computer and the engine started running smooth. So I replaced the temperature sensor and all was well!
Have you had fuel pressure tested, and/or filter changed. Have you checked for plugged exhaust, such as catalytic converter? Quite often engine will also run a little hotter than normal when exhaust is plugged.
1-timing on truck is ajusted by ecm,when u moved it u cause cam sensor code because it detected timing was off! 2-o2 sensors has the role of detecting air to fuel ratio coming out of exhaust,sends signal to ecm wich collects data from other sensors from that sets timing for best performance,if ecm detects something wrong in system data it will give engine code,that code will point at problem area,in your case o2 sensors probably detected lean fuel ratio that points to fuel system,blocked fuel filter or fuel pump faillure,elect,circuit damage,hope it helped!
Go to Advance or Auto Zone and have them run an obd scan on it and it will pin point why your light is on and could solve your problem. This is often done for free.
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