My fuel pump has been replaced twice already and im noticing when my fuel gets lower then a quarter of a tank it makes a knocking noise or like a humming sound as if its struggling to get gas when i drive. also now im experiencing sputtering when i first start my car and idle in drive or reverse it will **** and want to die. please help, i would like to know something before i spend too much to get it fixed. thanks!
Before listening to someone telling you to replace plugs & wires an filter an injector cleaner etc. An when that doesn't fix the problem they say the MAF sensor or coolant temp sensor ,throttle position sensor . Spend a 100 bucks for diagnostics an then know for sure whats wrong . So many sensors an electronic's on you vehicle . See this guy above isn't a tech . back yard shade tree probably . He is all ready telling change the filter an if that doesn't work change the plug's an wires an this an that .
Have scan data checked first ,before replacing any parts . I have thirty years experience , Dealer ship , independent repair shop , own shop , mobile diagnostic tech . I charge $24.50 to hook up scan tool ,factory scan tool , an view engine sensor data . Could most likely be a bad or dirty mass air flow sensor . O2 sensor .
002 Fuel System Tests Start Here
SOURCE: Van Sputters And Loses All Power When I Accelerate
Internal combustion engines requires 3 things... fuel, air, and spark. You do not have enough of one or more of these. If the wires and plugs are old, change them. Air filter, same thing. Fuel filter can also clog up with stuff after awhile. When you take a look at the air filter check where the air comes from. It is possible a little critter has built a home and blocked the air flow (rare, but, it has happened).
SOURCE: Sputtering and hesitation when started
Change the fuel filter and this ought to solve the problem. Also, pour a pint of fuel injector clearer into your fuel tank periodically.
SOURCE: 2001 Pontiac Grand Prix Knocking Noise - Drive Train?
if it only knocks or clunks puting in gear or gettingonit I would check motor & trans mount both upper dog bone & cross bars to core support
SOURCE: 2002 Grand Am GT stalls on start up and sputters during accel.
try your idle sensor or mass air flow sensor
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if you have not changed the fuel filter, do so now. and if this does not remedy the situation. change the plugs and wires also check ****** fluid because you said it only does this in drive or reverse. sounds like the problem is, its starving for fuel, change fuel filter. it would also be good to run some injector fluid in it to clean the injectors after replacing filter.
I mean injector cleaner !!
thank you very much! i will replace the filter and run some fuel injector cleaner too. i will keep you posted, if you dont mind.
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