Question about 2004 Chevrolet Cavalier

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Rough idle stalls and some times engine dies.P0300

I was told to check the fuel pressure regulator.Is it possible fuel is bypassing the regulator and putting fuel into the intake making it run rough at idle?The car runs good at higher rpm.Thanks.

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A car that idles rough and clears up is the sure sign of an o2 sensor shorted this may not give a code if the short in the sensor is bad the computer will eliminate its input to protect itself

Posted on Sep 03, 2009

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P0300 is a random or multiple cylinder misfire, and P1381 is a misfire EBCM (Electronic Brake Control Module) or PCM (Powertrain Control Module) Since you mentioned replacing fuel components, it could be as simple as a fuel injector being clogged up causing a cylinder misfire. Have you checked your fuel injectors?

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I have encountered this before and it was the vacuum supply line from intake to the fuel pressure regulator sucking fuel through regulator. it could also be more serious like intake gaskets

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The "rough idle" symptom encompasses many systems in the vehicle, which must all be checked. Is the "Check Engine" light on? Have you had the codes read? (Codes can be read and interpreted on your Cadillac using the air conditioning controls, the procedure for which can be found online using any search engine.)

Generally, especially on a car as old as yours, you will most likely need a MAJOR TUNE-UP. You will need to check all of the following:
  • Condition of the fuel in the gas tank (especially if the car sat dormant for six months or more);
  • Operation of the idle air bypass (Idle Air Controller);
  • Cleanliness of the throttle body and its components;
  • Condition of the fuel delivery system, including the fuel filter, pressure regulator, electric fuel pump, and injectors (this is the most likely suspect here);
  • Condition of the coil packs or distributor cap and rotor (I don't remember which your car has);
  • Condition of the spark plug wires;
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  • Operation of the ECU (or whatever you prefer to call the computer that controls your engine);
  • Presence of any vacuum leaks or cracks in the intake manifold.
START BY REPLACING YOUR FUEL FILTER, then check for proper fuel pressure at the fuel rail. Replace the pressure regulator as necessary and, if you are not getting enough fuel pressure, it is possible that rust and debris in your fuel tank has clogged the intake strainer and may have damaged your electric fuel pump. Once you have eliminated fuel delivery issues, continue by examining your ignition system (plugs, wires, etc.).

Best of luck to you!

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Try this:
-Check fuel pressure. (read in its repair manual to see how much it suppose to be.) If it's low then the fuel pressure regulator or fuel pump is defect.
-Is it fuel injector...? Then check its resistance of each injector when it's cold. If it's not within its specification then replace new one

Good luck

Mai

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signs of a bad fuel pressure regulator-- the vehicle will run rough, the engine will not start ( usually in the mornings,) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. 1- black soot on plugs-2-black smoke from tailpipe-3- running rough-4- stalling, good-day! repost if need be.

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My car will not start in the mornings or any extended periods of time .It will start after it has run for a while.It spits and sputters and shakes when trying to start it.When it does start and I press on...


here are a few possibilitys, a bad fuel pressure regulator . the vehicle runs rough, the engine will not start ( usually in mornings ) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. black soot on plugs, blake smoke from tailpipe, running rough, stalling. make sure fuel filter is not plugging up. or low fuel pressure from fuel pump. check fuel pressure regulator first. have a good day !! the regulator if bad will cause an instant drop in fuel pressure when turned off. and it will cause a delay in building sufficient fuel pressure,.when starting.

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