Question about 2003 Chevrolet Impala
When trying to accelerate the cars hesitates and then I let of the gas and press the gas again it will run fine till i have to stop and go again.no check engine light comes on no leaks are present it feels like either airflow or maybe vavles need to be cleaned
Or you have a misfire from spark plug wires
do. with a bottle of water add 2 table spoon of salt mixe together then with engine running spray the mixture small amount on spark plug wires and look for spark ,,,it will be more visible on dark shade area
caution; too much water you will not see the spark little fume of mixture .
hope it helps
Posted on Mar 27, 2014
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Posted on Jan 02, 2017
SOURCE: accelaration loss of power
I'd have a fuel pressure test done to be sure, it isn't fuel related again. Takes 5 or 10 minutes so cost should be minimal. The other thing that comes to mind is a plugged exhaust. (catalytic converter) Quite possible on a 10yr.old vehicle.
Posted on Apr 11, 2009
there could be several reasons for this type of problem. the engine is controled through main computer(ECM) and the sensors assocciated with it. most often times a hesitation is commonly a idle issue and that would be monitored by the TPS ( throttle position sensor) if this is beginning to fail it sends faulty reradings to the computer and the computer tries to compensate and sometimes either leans or richens the fuel air mixture cause and effect is a engine stall or a hesitation. another factor is your (O2) sensors these monitor your exaust and tell the ECM to adjust accordingly the fuel mixture also. a sure fire way to tell if one ore more sensors are faulty is to either have your check engine light come on or if there is a rough start. if the check engine light isn't on then i would think there is a timing issue involved and a tune up is in order. the tune up is simple by just changing plugs and wires, however the timing is computer controled and can only be adjusted by a certified tech with the proper equipment. try and change the plugs and wires first this is the least expensive way to solve your problem. if the problem persists then take it to a shop and have a tech hook up diagnostic tools to check the ecm for fault codes to narrow down whatsensors if any are faulty.
Posted on Apr 17, 2009
First check for any cracked pipes leading into the intake manifold If all OK (with no codes showing it probably is OK) try checking the fuel pressure regulator. If you smell fuel from the pressure regulator vacuum side arm (when the vacuum line has been disconnected) it needs to be replaced.
Posted on May 28, 2010
Sorry Cleef, on dial up and lost the connection.
The reason it does this at higher speeds is that more ignition spark is needed to fire the spark plugs.
Yes, it's time for a tune up.
A shop that has a scanner can identify which cylinder is causing the misfire. It will have stored a code to do this.
I hope you find a good expert on chat. If not, message me back here and I will help you find your problem.
Again, my apologies for my poor connection.
Posted on Jan 16, 2011
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