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Re: water in plugs
The ford focus suffered from leaking washer jets. The water leaked down into the recess for the spark plugs, causing them to misfire.
Sometimes this put excessive load on the ignition coil and it failed too.
Also i have had, worse case is the coil short circuits back up the earth switch, back to the ECU, blowing that.
The car still runs but only on 2 cylinders.
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Ignition Coil "A" Circuit Primary/Secondary Malfunction
Our emissions expert has put together the following information about the P0351 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code. OBD II Fault Code
OBD II P0351 Ignition Coil "A" Circuit Primary/Secondary Malfunction
What does this mean? The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. Without reliable performance from the ignition coil(s) the vehicle will stumble and misfire.
Code P0351 indicates there's an electrical problem in either the primary ( the computer side ) or the secondary ( the spark plug side ) of the Ignition Coil "A" Circuit. Symptoms
Check Engine Light will illuminate
Engine idles rough
Engine misfires on acceleration
In rare cases, the engine may not exhibit noticeable symptoms
Common Problems That Trigger the P0351 Code
Defective Ignition Coil(s)
Defective Spark Plug(s)
Intake Manifold Vacuum leaks
Carbon buildup in the Throttle Body air passages
Defective Idle Air Control Valve or Electronic Body
Ignition coil(s) replaced when cause of the malfunction was a vacuum leak
Spark Plugs replaced when cause of the malfunction was a vacuum leak
Hi joel , a few things to look at : Do you have a Engine management light staying on after the engine has taken ? , if so you will have to get a proper diagnostics test done , your onboard computer has the ability to store intermittent glitch information and produce a code which will point you in the direction of the problem.
No malfunction indicator lamp showing : make sure there is in fact a light showing when the ignition is turned on .
Now observe the condition of your primary and secondary circuit , check the wire connections at the coil or each coil depending on the application , check all other wiring leading to and from any sensor on the engine .
Air filter inspection clean or replacement . Check the condition of the spark plugs (if you have a lean burn white electrode)
Your condition described points a lot in the direction of low fuel pressure , have the fuel pump pressure checked out and replace the fuel filter.
Maybe find a better mechanic, because you car doesn't have a timing belt. Did you have this problem before the water pump was replaced? What engine do you have? He may be able to check IAC operation and crank sensor. Fuel pressure verified good?
See if your car has an ignition control module. They will go bad over time and cause random engine misfiring. Just went thru it with my 2002 Buick LeSabre. 120,000 miles on the engine. Replaced plugs, plug wires and check the coils. It was the ICM.
When cleaning your engine, water/degreaser went down the spark plug ports. Try using a air compressor blow gun to remove the moisture from around the spark plugs and boots. The water was causing the engine to misfire on 3 cylinders at first and as the ports started to evaporate the moisture, the less misfiring was occuring. Dry thouroughly and hopefully coils do not have damage to them. Also check to make sure the boot is making good contact with the spark plug.