Question about 1999 Chevrolet S-10 Pickup
Service engine light on and blink. Engine running rough.
Since your light is flashing, you need to get it to your mechanic..as this could be a serious problem...more then likely a tune up will be needed, but quite possibly a PCM as well...you need to get it looked at by your mechanic not the internet...
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
Check the coil pack. Same symptoms on mine. It went at 74,000.
You can get the resistance specs from a shop manual. I have been told the plastic engine cover traps heat and makes short life of the coil pack. I removed the top engin cover, cosmetic only after replacing mine. You will probably need spark plugs also they are probably fowled by now. If you have not changed spark plug wires in awhile in would not hurt.
Posted on May 04, 2009
you have a misfire, the eng light flashes,avoid driving it , or it can damage the cat converter,i dont know what repair was done, but if you replaced the spark plugs one may be damaged, or incorrect plug gap can cause this concern.
Posted on Oct 12, 2009
Light blinking means a malfuction in computer system, need to run a diagnostic on computer and retrieve codes to futher repair
Posted on Feb 06, 2010
Best way to diagnose problem, would be to stop in at one of the bigger parts stores like Autozone, Pep Boys etc, and they will usually perform a code scan free of charge, that in all likelihood, will point you in the right direction of what is malfunctioning, and you can get the replacement part right there. If not 100% sure what code is telling you, write it down and get back to us with that code(s) and we can guide you better from there. Good Luck
Posted on Jul 03, 2010
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 may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
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
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.
Posted on Apr 25, 2011
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