idles but it won't rev checked timing fuel pump throttle position, and still no luck
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what causes 2000 toyota corolla not to rev and give code P0300?
idles but it won't rev checked timing fuel pump throttle position, and still no luck
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Verified answer
This OBD-II code this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
Causes
A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer
Possible Solutions
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
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.
to add, support,
"what causes 2000 toyota corolla not to rev...."
the ecu/computer is in fail safe-limp mode. the ecu has determined that there's not enough info to perform dynamically. to keep you from being stranded or cause more damage to the vehicle, it reverts to a "limp mode". last known good config but w/limited function.
symptoms of that are not getting into the advance curve. around 1700-2000 rpm. the ecu will only provide base info. no advance timing or fuel trim.
which is what you're experiencing.
do take this to a reputable ASE shop or the dealer for diagnosis. 80 bucks or so just to verify the codes. then what ever is wrong. this seems pricey. but cheaper in the long run. as opposed to just replacing parts.
There's a quandary with your variable valve timing oil manage valve, it will most likely result your powerband and can motive a drawback until its resolved. You will obviously desire a store to properly diagnose it, as an alternative then attempt to fix it without difficulty through changing the valve.