What are the symptoms of a faulty TP sensor and oxygen sensor?
I have a 99' pontiac grand prix se 3800 and I have had all kinds of different mechanics tell all different things (EMC codes), except that it is an electrical problem. When I start my car it stays on but the idle bounces up and down between 1/2- 2 1/2 RPMs and sounds really bad. Sometimes it just turns off after idling for a little bit. If it helps, the problem started after I drive threw a puddle of water but it wasnt that deep. I think I might have shorted out a sensor on the bottom of the car. Any help we be great, thank you!
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My Pontiac Grand Prix is also a 99, it has 216,+ thousand miles on it, it runs great, idles good, I need to replace the oxygen sensor tho as it shuts off on me while driving or sometimes coming to a stop. You might try checking the fuel filter and pump as well.
tough one, has many things that could be wrong..to give you some idea...Air filter, a loose air hose, gas filter,oxygen sensors, sparkplugs wires or even crossed wires will all play a role in the hesitation that your car is producing, I have 2 grand prix and one of them is hesitating on me right now, I know its the oxygen sensor but I cant fix it now, dont have the money to. I know it wastes more gas but oh well for now! Try testing first.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
bad oxygen sensor will make a car run rough.also mass air flow sensor egr valve sticking open or pvc valve open.idle speed control problems.have your car scan.because there are many sensor causes it to run rough.