2015 ford sho thru a code Po303

[sanman]

Started my car no problem. Pull out of the driveway bam ....car was running bad...transmission light came on just installed Aeroforce gauges last week good thing , read the code Po303. Shut the car off started up still running bad, shut off car the third time started up now its fine? Runs great drove to gym, store, ect. all good put about 10 miles on all good. Googled a bit says misfire cylyder 3 ,bad fuel injectors, chafed wires anybody here ever have this problem? Cars History 2015 Sho 15,000 miles livernois tune 93 V11 w/cai 160' therm. Never beat on the Car once in a blue moon on the hyway Car is Babied....... Some feedback would be appreciated Thanks

 

[krewat]

I'm not sure about these cars, but on the modulars, the plug holes can get water in them. Pull the COP for #3 and see if there's water or dirt down the hole. If you washed the engine compartment, that'll do it.

What happens is, a drop of water gets down there, start the engine, plug warms up, water turns to steam, shorts the COP to ground. Sometimes, the steam will expand enough to push most of it out, and it won't happen again right away. Let it cool off, steam turns back to water, water settles down to the bottom of hole. Rinse and repeat (pun intended)

 

[Livernois Motorsports]

Sometimes it can be something as simple as a dirty plug havent had any issues like this with my own personal sho but keep us updated and we will help the best we can!

 

[sanman]

I'm not sure about these cars, but on the modulars, the plug holes can get water in them. Pull the COP for #3 and see if there's water or dirt down the hole. If you washed the engine compartment, that'll do it.

What happens is, a drop of water gets down there, start the engine, plug warms up, water turns to steam, shorts the COP to ground. Sometimes, the steam will expand enough to push most of it out, and it won't happen again right away. Let it cool off, steam turns back to water, water settles down to the bottom of hole. Rinse and repeat (pun intended)

I'm not sure about these cars, but on the modulars, the plug holes can get water in them. Pull the COP for #3 and see if there's water or dirt down the hole. If you washed the engine compartment, that'll do it.

What happens is, a drop of water gets down there, start the engine, plug warms up, water turns to steam, shorts the COP to ground. Sometimes, the steam will expand enough to push most of it out, and it won't happen again right away. Let it cool off, steam turns back to water, water settles down to the bottom of hole. Rinse and repeat (pun intended)

I will look into that i did wash engine compartment last week, but was careful not to over soak the plugs but hey you never know thank you i let you know fingers crossed.

 

[sanman]

Sometimes it can be something as simple as a dirty plug havent had any issues like this with my own personal sho but keep us updated and we will help the best we can!

What plug is number 3?

 

[krewat]

Standing in "front" of the engine looking at the accessory pulleys (standing on the passenger side) it'll be the "rear" most plug on your left side.

In other words, closest to the steering wheel

 

[sanman]

Standing in "front" of the engine looking at the accessory pulleys (standing on the passenger side) it'll be the "rear" most plug on your left side.

In other words, closest to the steering wheel

Thank you .....