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Scott, I as well have a 2002 chev blazer 4x4 4.3L, and though I have not exerrienced your paticular problem, I have experienced Service Engine Light on, and generaly I have found it is one of your sensors. You could have a bad sensor causing your rev problem. What I do is determine if the vehicle still runs as if the service engine light has not come on. If it runs the same, in my experience it is not as crucial as if you have a performance issue, as you do with reving. If I was you I would try to get to your mech ASAP. I am not aa mech but, I know our chev blazer very well, and how it should perform. Hope this helps, Chuck
hi this can be found by locating either the top hose or bottom hose on the radiator, following this to the engine block, where it attaches to the engine that will be the thermostat housing, under that will be the thermostat...hope this helps
Ok, first, you should clear the fault. Sometimes the system will get a bug, and there's not really a problem. You can do this by disconnecting the battery for 10-20 minutes. This will clear any faults. Next, see if the light comes back. If it does, then you can take it to get the codes scanned at a parts store(many do it for free.) Once you get the code and description, you have to troubleshoot the specific system that the code covers. The check engine lights are usually triggered by sensors going bad. On occasion, you will get an actual mechanical failure that will cause one.
Crank sensor is located on the engine front cover, down low. Yes... if this part were bad, this could be one of many reasons the car won't start. The bad part would usually set a diagnostic code (P0335 or P0336).
hi john , sure sounds like you may have unplugged the coolant temp
sensor or didn't get a good connection at the sensor , location , in
between two exhaust ports on the side of the engine that has the oil
fill and pcv .