Question about 2007 Chevrolet Impala

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Reduced engine power when going up a hill

Feels like it spits and sputters

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First off, if not done recently, do a complete tune-up on it; Plugs, cap and rotor, fuel filter, check oil level,... if that doesn't do it, the next thing I'd do is rent a fuel pressure tester and see if the pump is making the right pressure. There are many other things it could be, but without more info,...

Posted on Apr 13, 2014

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1 Answer

What would cause the van to start spitting sputtering misfire when going up hill or encline


Could be clogged fuel injectors. I had a problem similar to this. Car ran okay on flat areas but would spit and sputter going up inclines. I took mine to an oil change place and they ran a cleaner through the system. This fixed the problem and I put an injector cleaner in with every 3rd tank of gas to keep this from happening again.

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If the check engine light is not on, I doubt there is much you can do.
It sounds like one of the engine temp sensors or one of the other sensors. The engine temp sensor and the intake air temp sensor tell the computer what the outside air temp is and the coolant temp which allows the computer to regulate the amount of fuel going thru the injectors. Generally if one of the sensors has failed the check engine light should be on.
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Hi

It could be numerous things so please accept this is a partcial solution, just for some idea's for yourself.

Firstly the I would check the EGR valve also known as the exhaust gas recycler valve, this reburns fumes from the engine to improve power and to lower emmisions. very often is the cause. you can clean this with carburetter cleaner and I would recomend you try this before buying another as they are not cheap. What engine isze is this? get back to me and I should be able to tell you the location of the part and how to remove it.

With EGR faults you lose lots of power and the car feels like a lemon, maybe 50 mph tops. its a good indicator if this is how it has been, also lots of black smoke wehn under load.
Hope this helps
Regards
Dan

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