Code p300

[ShadowsPapa]

Boys shop just called,

He changed spark plugs and coils, he said it’s running smooth, on the way to pick it up now. Said I must have put shit gas/ stop putting regular gas. But I’ll get more info when I see him

Shit gas would cause all the cylinders to misfire. Nor do multiple coils just go out at once. Hope it works out but I would temper expectations

Sorry, but I'm with @Hootbro (as is common). No way it's the gas (and regular is FINE). If he believes that regular gas will cause 3 cylinders on one bank to misfire and not the others, not sure how much trust I'd put into any other work..............
Multiple coil packs, all on the same bank? Naw........

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[Stan H]

Boys shop just called,

He changed spark plugs and coils, he said it’s running smooth, on the way to pick it up now. Said I must have put shit gas/ stop putting regular gas. But I’ll get more info when I see him

It is a million to one shot that yours had defective plugs all thd same side , but Im with Hoot go in with reserved enthusiasm now water in th fuel can do odd things sometimes.

 

[ShadowsPapa]

It is a million to one shot that yours had defective plugs all thd same side , but Im with Hoot go in with reserved enthusiasm now water in th fuel can do odd things sometimes.

But only to one bank?

 

[Stan H]

But only to one bank?

Yeah awfully strange .. I have seen the time I got ahold of some bad fuel missed on a few cylinders but it cleared up by next day and fuel up. Happened in a Toyota work vehicle.

 

[DennyInDayton]

Yeah awfully strange .. I have seen the time I got ahold of some bad fuel missed on a few cylinders but it cleared up by next day and fuel up. Happened in a Toyota work vehicle.

The only one bank is the trip, I would have thought plugs earlier. A mechanic friend of mine had Toyota that ran rough, nothing seemed to point to the problem, but the customer had put platinum plugs in, swapped them back to the basic OEM NKG's problem solved. The computer didn't like the plats, but that wasn't one bank, and I would assume the dealer would have put OEM back in this Jeep. Maybe the mechanic dropped the last 3 on the concrete before installing and cracked the ceramic, I guess if it's back to running smooth be glad. Did the plugs from one bank look different than the other (fouling)?

 

[Lost1wing]

If coils and plugs took care of it and he has written documentation of a recommended engine replacement, I believe my story would be heard loud and clear. That is criminal. Predatory shops like that need to be exposed.

 

[Hootbro]

So what is the outcome after picking it up @Mark42 ?

 

[ShadowsPapa]

If coils and plugs took care of it.........

That would be interesting, but a shocker. Really? 3 coil packs, or 3 plugs, all in the same bank? Wow, he needs to go buy a power ball ticket!

For the rest, yeah, someone would need to be called out on that.

The only one bank is the trip, I would have thought plugs earlier. A mechanic friend of mine had Toyota that ran rough, nothing seemed to point to the problem, but the customer had put platinum plugs in, swapped them back to the basic OEM NKG's problem solved. The computer didn't like the plats, but that wasn't one bank, and I would assume the dealer would have put OEM back in this Jeep. Maybe the mechanic dropped the last 3 on the concrete before installing and cracked the ceramic, I guess if it's back to running smooth be glad. Did the plugs from one bank look different than the other (fouling)?

It's amazing how much the PCM tracks things and can actually read if a plug fired or not - there are reasons the spark plugs that are called for are the spark plugs that are called for.

Anyone good with a scope can read exactly what's going on in a cylinder with fuel mixture, the ignition system and more - and the PCM in some vehicles is far better than the best human could ever be.

I've seen a bad diode in an alternator on a Toyota cause problems with the FUEL INJECTORS - the PCM reads things so closely that the ripple in the electric system from that bad diode freaked the thing out.

 

[Hootbro]

So what happened @Mark42 ? Seen you have been online at least twice today so I am going to assume it was not successful?

 

[Hootbro]

 

[Lost1wing]

So what happened @Mark42 ? Seen you have been online at least twice today so I am going to assume it was not successful?

He's out driving the crap out of it making up for the lost time. No time for this forum nonsense.

 

[Stan H]

He's out driving the crap out of it making up for the lost time. No time for this forum nonsense.

Or.. He got conducted by aliens

 

[ShadowsPapa]

Or.. He got conducted by aliens

Here's your alien conductor..............

 

[Stan H]

Here's your alien conductor..............

Lol I meant abducted

 

[Stan H]

Here's your alien conductor..............

You got me for sure on that one

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