Question about 1996 Chevrolet C1500

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I have a 1996 chevy c1500 that is throwing a p0300 code indicating random multipul engine misfire. this is the only code it shows I am familuar with older non computer engines but cant determine the cause of the misfire on this one. Could this be a distributor cap or plug wires like on an older car. I dont find any carbon tracks or cracks in the cap or visable damage to the wires.

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Look at the plugs, if they looked hot and cooked then the misfire is unlikely to be electrical. If they look OK check out the Cam sensor connections on the edge of the flywheel housing. If the plugs are cooked it could be a duff EGR valve or, because you have no code, a clogged exhaust feed pipe to it. The absence of the introduction of a measured amount of exhaust gas to the mix would give rise to systemic overheating of the ignition temperatures and this in turn can lead to multiple fire events

Posted on Aug 29, 2010

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1 Answer

P0300 lhs code


A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring.you can use this tool clear the DTC.

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1 Answer

I have a 97 chevy tahoe 5.7 i just did a intake gasket due to the one given out truck ran fine befor i took it a part but now it runs and throws the p0300 code has a slight rough idle


P0300 random misfire, slight rough idle good , by the way your repair is good you dont want a identified misfire, Lets start by what it is not. Not a misposition sparkplug wire you would of gotten that cylinder code, as misfire, Oh try this got carburator cleaner? spray safely along the intake gasket, How about inspecting the vacuum hoses especailly at the map sensor. Here the thing you got. a vacuun leak. on a 5.7 a vacuum leak causes random misfire, by definition P0300 means 2 cylinders or more. By experience its a vacuum leak

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1 Answer

I have a 1999 Chevy Astro that is giving me a P0300 trouble code. So far I've replaced the plugs, wires, cap, rotor, coil, fuel filter, air filter, and catalytic converter. I'm still having the...


P0300 Diagnostic Code - Random Misfire
Technical description:--
Random/Multiple Cylinder Misfire Detected:---
Exactly what does this code means:--
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
Symptoms:--
the engine may be harder to start.the engine may stumble / stumble, and/or hesitate.
other symptoms may also be present…There may be rough idle, sputters and stallsand jerks.
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 for this error problem:--
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 vehicle, 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 un-metered air getting past the airflow sensor, or an EGR valve that is stuck open.

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1 Answer

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It has to do with engine valve seating problems.

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