Question about 2005 Chevrolet Express

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I have a 2005 chevy express 2500 and the check engine light is on. i ran the ECU test and go the code po300 for random miss fire. and also it says its miss fire at 120 km/h i.e high speeds. does any one have an idea on what might be causing it?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 972 Answers

SOURCE: I have trouble code

if it has the 2.5l v6 then your distributor is possibly bad [all 95s came from the factory with defective solder joints in the dist.] or your egr valve is stuck open or leaking. to check for that start engine when cold open hood and locate egr valve rear center of intake it has a round top with a vac hose on it. there is a steel tube that connects to it that goes to the exaust.sprincal a few drops of water on the pipe. if it sizzles then the valve is bad.

Posted on Sep 02, 2010

emissionwiz
  • 75822 Answers

SOURCE: random misfiring on pistons on a 1996 chevy suburban

1st thing to check is the intake manifold for vacuum leaks, also check and make sure the EGR valve is not leaking when it is closed, to check the intake buy a can of carb spray and sray around the top of the engine, if a leak is present there will be a very noticeable change when the spray is near the vacuum leak. To check the EGR Valve start the engine cold, wait a minute or 2 then spray water on the EGR, if it steams up the water it is leaking exhaust into the engine, this will cause a rough run as well.

Posted on Oct 14, 2008

awcforever
  • 359 Answers

SOURCE: I have a 2005 Chevy Malibu. The check engine

"This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine."
Hope that helps..

Posted on Mar 25, 2009

  • 150 Answers

SOURCE: service engine light blinks,code read out of po300

Code p0300 is the code for "random missfire detected". The "check engine" light is flashing to warn you that severe damage is being done to the catalytic converter.(very expensive)..

Posted on Apr 28, 2009

Molson02536
  • 3854 Answers

SOURCE: 2004 Chevy Silverado HD 2500

On many engines with distributor less ignition systems and sequential fuel injection, a camshaft position sensor is used to keep the engine's control module informed about the relative position of the crankshaft. By monitoring cam position (which allows the control module to determine when the intake and exhaust valves are opening and closing), the control module can use the cam position sensor's input along with that from the crankshaft position sensor to determine which cylinder in the engine's firing sequence is approaching top dead center. This information is then used by the engine control module to synchronize the pulsing of sequential fuel injectors so they match the firing order of the engine. On some applications, input from the camshaft position sensor is also required for ignition timing.
The camshaft position sensor may be magnetic or Hall effect, and mounted on the timing cover over the camshaft gear, on the end of the cylinder head in an overhead cam application, or in a special housing that replaces the distributor (in the case of some of the GM applications). Operation and diagnosis is essentially the same as that for a crankshaft position sensor.  

Re  check the wire harness and the sensor installation to the camshaft sensor in Bank #1 which is where the #1 cylinder is. Good luck and hope this adds some light to you question, keep me posted and be glad to help.

Posted on Jun 02, 2009

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goto engine-codes.com there is info on them lots of it and how and what to check the po300 is a random miss fire can be spark plugs coil fuel injector air leak and more it tells you what to ;look for ect. ok good luck

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Code 300 means you have a random miss that is not serious enough to pick one cylinder. The computer measures RPM on each cylinder as the plug fires. So it is not that a cylinder is not firing but rather that it is not producing enough power.
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2002 Envoy sle 4.2 L straight 6. Random misfire(PO300). After erasing codes for several days, I finally took my car on the highway and ran it at high speed(70+) for about 4 to 5 miles. Check engine light came on as before but this time it gave me(PO305). Random misfire cylinder 5. So I switched coil 5 with coil 2. Went back out on the highway and repeated as before. This time it gave me(PO302). This was telling me I had a bad coil. Replacing one coil pack solved the problem. The professionals told me low fuel pressure would not give me random misfire, but rather a O2 code because the engine is running lean. Thank you------------------------------------ thank you very much.

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the flashing light is telling you the engine is miss firing, not that there is fuel in the exhust a miss fire is the only thing that will cause the light o flash the P0300 is a random misfire so i cant tell you witch cylinder but replace the coils that should take care of it....good luck

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Code p0300 is the code for "random missfire detected". The "check engine" light is flashing to warn you that severe damage is being done to the catalytic converter.(very expensive)..

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