1996 Toyota Corollla Code 301 Solution.
Our Vehicle as mentioned before has the engine light coming on and our scanner shows code 301. Could somebody please tell us the solution to this problem. Thank you.
P0301 is a misfiring in cylinder # 1. Check the spark plugs and wires for a start.
August, 13, 2013 AT 2:07 PM
Thank you for your suggestion. What we decided to do was to replace the distributor cap, the spark plug wires and readjust the spark plug gage to 0.032. Also, we noticed that when we removed the spark plug wires, one at a time while the engine was idling, cylinder # 1 did not show a difference as noticeable in cylinders #2, #3 and #4. We then proceded to test for leaks in the intake manifold, especially near cylinder #1 by using a spray product, namely PB Blaster and spraying it on the intake manifold gasket. We were hoping to see a change in the idle/RPMs if there was a leak. But we did not notice any change whatsoever. In the next step, we wondered if this problem could be an indication that the fuel injector for cylinder #1 is not working properly. So, today we used a fuel injector cleaner when fueling the vehicle. At this point we decided to drive the car and so far we have not noticed the service engine light come on and the engine is no longer running rough as it did sporadically before. The vehicle is going to be driven for a long eleven-hour trip in the next few days and we would like to make sure we have done everything that can be done so that this problem will not reoccur during the trip. We would appreciate your comments.
August, 14, 2013 AT 1:23 AM
Cylinder # 1 was not firing and seems the problem has been resolved. The problem could have been due to the injectors but it was not tested so we have no way to find out unless it recurrs again.
If the engine is not running as smoothly as it should be, you need to have the compression checked. The valve clearances might require adjustment.
August, 14, 2013 AT 9:58 AM
We noticed again the problem yesterday afternoon. This time only the service engine light came on. The engined seemed to be working o.K. We have not checked the injector yet. We will be doing this soon. Any suggestions regarding this procedure in the mean time will be appreciated. Thank you.
August, 14, 2013 AT 9:29 PM
Retrieve the trouble code and if it is for P0301, have the valve clearance and compression tested
August, 27, 2013 AT 9:56 AM
Recently we had a chance to check the fuel injector from cylinder #1 by interchanging the fuel injectors in cylinders # and #2. This resulted in trouble code P0302. Consequently, we replaced that fuel injector with a re-manufactured one at a fraction of a new one which costs over $175.00.
Thank you so much for you help.
August, 27, 2013 AT 11:44 AM
You're welcome and glad to know you have fixed the problem.