Question about 2003 Pontiac Grand Am
My knowledge of the Pontiac Grand Am series vehicle prompts me to question the maintenance and upkeep of your vehicle. There are three things that come to mind when a vehicle will not go past a certain speed:
1.) routine oil changes; an experience I had with a stick shift vehicle was due to a small oil leak that caused the RPM to not go as high as too little oil was being detected and the car wouldn't go over 50 mph.
2.) restricted gas flow can also limit the ability to accelerate and achieve normal speeds under normal circumstances. Spark plug gaps and type can also play a role in this issue as well as the spark plug wires.
3.) built within the computer for the cars' electronics is a governing chip which, depending on where you live and what the car may have been exposed to(like someone trying to jump the car off and crossing the polarity) could have either modified the programming on the chip or the main board itself may have sustained liquid or other substantial damage.
I would rule out the first two before trying the third. I would verify the oil and gas pumps are working properly before going to three. I live in a small city and I am the only "known" person that works on and repairs these type boards. The sad thing is there are a few that are just not repairable. The third also requires you to take out the passenger side seat to get to the housing for the main board and also requires special tools to get it out so, if you have verified the integrity of the pumps, plugs, and wires then it will most likely be the main board.
I don't recommend this but there are several mom and pop garages that have the hand-held computer to reset the board but, if it is damaged, the reset could cause the car to become non-usable.
Hope this helps.
Posted on Feb 03, 2016
Many things cause this. Start with a cheap fuel filter.
Posted on Feb 03, 2016
TPS, plugged converter, transmission a few things you can start with
Posted on Dec 11, 2015
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Posted on Jan 02, 2017
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