At 11K miles on the automobile I was getting a random misfire code. P0300. I confirm around and could not discover an NKG plug so ns purchased a set of Motorcraft SP-520 3.7L V6 Mustang Spark Plugs native Ford Dealer. They are platinum and also run around $10 each.
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I pulled out my SCT tuner and also plugged it right into the ODBII port and it gave me the P0300 code. A P0300 diagnostic password is a random or lot of misfire. If the critical digit is a number other than zero, it coincides to the cylinder number that is misfiring. A P0303 code would tell girlfriend cylinder number 3 is misfiring. Unfortunately, a P0300 doesn’t tell you particularly which cylinder(s) is misfiring, no one why. So my first plan of assault was to change the spark plugs.
The problem on my vehicle seems come be pertained to Ford TSB 21474
This is a nasty ECU bug that deserve to come right into play with certain repairs or modifications. This impacts both 3.7L and also 5.0 Mustangs.
|Symptoms the a P0300 might include:The engine may be harder come start.The engine might stumble or hesitate.||A code P0300 might be early to:Faulty spark plugs or wiresFaulty coil (pack)Faulty oxygen sensor(s)Faulty fuel injector(s)Burned exhaust valveFaulty catalytic converter(s)Stuck/blocked EGR valve / passagesFaulty camshaft place sensorDefective computer|
|If there space symptoms such together the engine is stumbling or hesitating, examine all wiring and also connectors that cause the cylinders (i.e. Spark plugs). Begin with spark plugs, and coils first. In part cases, the catalytic converter has gone bad. If you odor rotten egg in the exhaust, her cat converter demands to it is in replaced. In some instances the problems could be fuel injectors.|
Random misfires the jump approximately from one cylinder to one more (read: P030x codes) additionally will collection a P0300 code. The underlying cause is often a lean fuel condition, which may be because of a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is grounding open.
|Here room the Motorcraft SP-520 3.7L V6 Mustang Spark Plugs in the box. Alternate part number CYFS-12F-5.|
|These to be gapped over .45 native the factory. Nick the tuner at ProCharger encourage I void them indigenous .35 come .38 (because the the blower)|
|Pull her engine sheathe if you have one. Likewise your strut tower bar if you have actually one the those also. Begin with pulling the bolt hold the coil down.|
|Then press the red tab up and also pull the coil electrical connector off.|
|My first coil left the boot inside stuck on the plug. I tore it increase trying to get it off. This to be a $3 part at the ford dealer.|
|Get her 5/8 plug puller out and pull lock gently. Also remember when you stick them ago in thread lock by hand. If you mess of the soft aluminum object then game over.|
|Don’t forget a dab the anti-seize on each plug.|
|Also to keep your coil boots native sticking then you can apply a small bit of boot lubrication. Hope this will store them native sticking next time you take them off.|
|No for the Passenger side. You will must remove the intake manifold. There space 7 bolts ~ above the top.|
|1 bolt for the PCV valve hose.|
|Electrical connector on peak at the EGR valve.|
|Use her u-shaped puller to get this wire impend harness connector top top the accelerator body. There is an additional one on the various other side the the accelerator body.|
|I pulled this vacuum line at this ar near the firewall.|
|Then the EGR valve hose has actually a clip on peak you pull out.|
|Now you deserve to pull the manifold turn off the car.|
The cylinder shoot order for the 3.7L Mustang is 1-2-3 ~ above the passenger side and 4-5-6 on the motorists side. The firing stimulate is 1-4-2-5-3-6.
|Then you have full access to the best bank.|
|Now is the perfect time come clean turn off the entry manifold.|
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|Now turning back the procedure to placed it all ago together. Below is a top shot, you have the right to see the 7 top bolt holes.|