Question about Cars & Trucks
What model of chevy? What is engine litre size? What are the problems? I\'d give it an overall tune-up. Erase the codes and see if anything comes back. Just a note, by erasing the codes, you may loose any freeze data that you other-wise may have. Did you use a gage and check fuel pressure. Not only check for correct fuel pressure, if no internal pressure bleed-off, check that the pressure will hold for a bit with everything off. Any more, 02 sensors are part of a tune-up. Can you check if system is running rich or lean?
Do you want me to list the code definitions or can you look it up? Removing the cat is illegal, if you live in a state that doesn\'t do sniffer tests or vehicle inspections, you may get away with that.
Posted on Dec 11, 2014
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Posted on Jan 02, 2017
Below are some tips for resolving a code 300. Have you taken the injectors out and watched them squirt? Unfortunately, I do not have a manual for your car.
Random misfire troubleshooting:
The engine computer sets these codes when the crankshaft position sensor indicates rpm hunting under constant external conditions. Therefore, it is very difficult to distinguish genuine misfiring cylinders from generalized rough running.
Random electrical misfire:
If the cause is electrical, it is in the ignition system that produces the signal to the coil(s). In older engines, this might be due to a failing ignition modulator or pickup coil in the distributor. In modern engines, it might be a loose, failing, or poorly connected crankshaft position sensor (or camshaft position sensor in those engines that use this sensor for spark timing). This condition may or may not set an OBD II trouble code. Because of the large variation in ignition systems, I recommend you get the wiring diagram for your ignition system to see what components may be the cause of an inconsistent ignition signal to the coil(s). In rare cases, the problem may be with the modern ignition control, engine control, or powertrain control module. The problem may also be with general deterioration of the ignition wires. This condition can be verified by running the engine in a dark environment and watching for sparks jumping off the coil or wires.
Air/Fuel causes of a random misfire:
For the issue to be identified as a misfire, the changes in conditions in the cylinders must be rapid rather than gradual (such as in the case of a hunting rpm). These kinds of changes may be caused by unsteady airflow in the intake or inconsistent injector operation. Always check for a clean throttle body and idle air passage as well as idle air control motor operation. Also check the EGR valve operation and flow path. There may be specific tests you can run on these valves for your car. Consult a manual if you want to check these out carefully. Most of these components can be cleaned with good old-fashioned carb cleaner. It's also a good idea to make sure your vacuum operated fuel pressure regulator (if you have one) isn't drawing fuel into the intake manifold through a torn diaphragm.
Random injector issues are rare but may be caused by dirty fuel or worn out injectors. Another possibility here is a camshaft position sensor malfunction, but this will usually set another trouble code. In rare cases, injector timing and pulse width irregularity can be caused by the computer itself.
Posted on Dec 05, 2010
Change the Mass Air Flow sensor.Or the the Volume Air flow sensor.Also replace the ( IAC ) Idle Air Control. There is no code P1518 are you sure they wrote it down for you correctly? I just had my Library of codes updated last week and it is not on the list. After all repairs are made make sure you have the Diagnostic Trouble Codes Erased from the on board computers memory. This will reset the check engine light and keep it from comming on again for thoes codes.If it does come on again and it relays more DTC you can ask me for further help through the Reply Window. Good Luck and have a good XMASS.
Posted on Dec 14, 2010
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