Question about 2003 Chevrolet Impala
Well John there can be a number of reasons but not knowing ur car
I will say that millage has to do with it alot.
I have an 89 firebird 307 v8 with 198,000 original motor
It runs great but down on power. Basic thing is the motor is getting old
an wearing out. This could be ur reason too.
Also tune ups make a big difference and 3,000 mile oil changes
with good grade oil make a difference !!
The real way to find out is to go to ur repair shop and have them
do a compression test on ur motor. If the compression is low but all
cyclinders are close in comp. its just wearing out but u could have several cyl. down more than 20% compaired to the others.
Could be bad valves seat, bad valve, carbon deposits on the valves,
they can also leak, injectors or carb depending on yr of car needs attention, an it can go on an on!!!!
Ask questions of ur mechanic!!! Then do search on Google on the answers!!! To see if he is telling u the truth!!! Lots of them don't , they just want ur money!!!!!
Posted on Aug 06, 2010
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Posted on Jan 02, 2017
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