Question about Cars & Trucks
The 0303 code is a misfire, but it can come from odd ball ways. Coil pack failure water or oil down on plug or in wire. Dielectric grease should be used anytime you repair this problem. Fuel sometimes fails to get in. Many causes, change out the injector to another cylinder an see if code changes. Most of the time i have seen it other than injector failure is something is leaking on to plug or wire causing misfire.
The 1401 code i think has a service bulletin from Ford. You probably have no choice there but to replace it.
Posted on Mar 30, 2014
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Posted on Jan 02, 2017
SOURCE: 1997 Mercury Sable Misfire
they may have done a relative compression test which is done electronically by measuring the RPM drop of each cylinder when the test is running, but not sure anyone but the dealer can do this test. This low compression you mentioned is not good, suggest u run the test yourself, the compression test guage kits are cheap u can buy them on line for about $25 US, also tank added chemicals don't do anything in the short term and noting if the injector is badly clogged, do u understand what I mean about a high pressure factory cleaning? it is quite a different animal.
Posted on Jan 21, 2009
it is located on top of the engine right below the air inlet tube at the base of the intake it is a black sensor on top of a silver housing where the distributor would normally be
Posted on May 03, 2009
this is one of those situations that a professional diag would of saved you alot of money. Its possible you just got bad gas and your injectors are partially clogged. An 02 sensor would not give multible misfires. EGR would only misfire at idle if stuck partially open since its suppose to be open cruising. Fuel filter would give you a starvation issue but if the misfires happens at idle then the filter most likley is ok.
Data from a professional data scanner will store the conditions when the misfire occurs. Also for a chevy each cylinder will have a misfire counter and one can see the misfire happening as it happens. If its idling and misfiring and gets better as you rev it up most likely you have clogged injectors or a intake vacuum leak. You can test for a intake leak by spraying the intake area with water(idle will faulter if it draws water in), or use brake cleaner (idle will raise when fluid gets drawn in).
If no leaks are found I would do an injection service or at least add two bottles of techron to a full tank, drve till half a tank then top off again.
Also if the catalytic converter is clogged the backpressure could cause all sorts of misfire issues. Removing the two upfront 02 sensors and driving will indicate the exhaust is clogged or not. We put a pressure sensor in place of the 02 sensor. If the pressure is above 5psi this would indicate some blockage. It should be below 3psi at 2000 rpm. Also if you have K/N filter the oil from it will coat the maf sensor wires in time,, (always). You can remove the sensor and spray the wires with brake cleaner to clean. DO NOT touch them. They can be brittle. Look at the wires for color. They should be shiny silver. If its coated the PCM will not see the air volume or accurately see the air temperature. Without this information the PCM will not add enough fuel which will create a misfire.
Posted on Jul 07, 2010
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Sep 25, 2014 | Cars & Trucks
P0305 is misfire in cylinder #5.
P0306 is misfire in cylinder#6.
P0316 is misfire on start up.
Have the plugs on those 2 cylinders, and the 2 fuel injectors checked, also check for spark from the coil on those 2 plug wires.
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