Multiple Misfires, engine running really rough.

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GitEmSteveDave

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So I was driving to a friends house yesterday, 7/29, after visiting my house to start moving stuff out after a fire. She was running great all day, as I had to drive bags of warm food from my fridge/freezer to a local dump, and all of a sudden, about half way there, she starts sounding like she wants to stall and the CEL is flashing. I run the trouble codes on my tablet and had a code for multiple misfires and cylinder 1 & 6. I know I pushed her hard last Wednesday, 7/24, when I got the call about the fire trying to get home, so I thought maybe I had knocked some crud loose in the lines, so I put $10 of Top Tier with some Lucas in. By the time I got to my friends about 10 miles later, I was up to 3 misfires, 1,5 & 6.

The coils and plugs were done at 128,000 and she's at 136,000 now. NGK plugs and I forget who the coils were, but someone reccomended them here. The only problem was a transient cylinder 2 misfire(about once a month), which always cleared itself and never triggered the light. I had swapped the 2 & 1 coils, anyway, just to be safe.

I probably shouldn't have kept driving her, but my brain is all over the place this past week and I just wanted to get to my destination. I drove it a few miles this morning and it's at my regular mechanics now. I'm a mess, b/c she's my only vehicle, and I need her to get back and forth to work.

Any ideas?
 

LibertyTC

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Wow sorry to hear about your misfire situation. Was there any objectionable valve train noises?
Can you look back into your records to find which brand of coil packs were installed?
Just for reference any flashing CEL means pull over and shut it down.
I hope it is just something simple, I wish you the best. Post back what your mechanic discovers.
 

GitEmSteveDave

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Wow sorry to hear about your misfire situation. Was there any objectionable valve train noises?
Can you look back into your records to find which brand of coil packs were installed?
Just for reference any flashing CEL means pull over and shut it down.
I hope it is just something simple, I wish you the best. Post back what your mechanic discovers.


I just checked, they were the Standards UF270's you recommended in 9/2018, and had been performing perfectly up until yesterday afternoon.

I'll post back when I hear. I really need the Jeep because I'm living out of 3 bags, and need a way to do laundry soon.
 

LibertyTC

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You need some good & even better luck...Fire..yeiks, what caused that?
 

GitEmSteveDave

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You need some good & even better luck...Fire..yeiks, what caused that?
We lost power in a big storm in Monmouth County on Sunday 7/21. When they re-energized our lines on Wednesday 7/24, there was a ground wire tied up in a tree. Caused an overload to the house, which caused a outlet behind my couch to spark/short(only thing plugged into it was the ac power cord to a laptop power supply, which I unplugged weeks ago to power a laptop at work and a timer for a lamp I hadn't used in at least 5 years) , which started I'm guessing cat hair and other stuff under the couch on fire....

The first cop on scene said the power guys were beating the meter off the side of the house because it was smoking.
 

GitEmSteveDave

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Just spoke to the mechanic. He pulled all the coils, checked them for spark, and they were good. Reset the codes, and #6 came back on. He checked the plug itself with a light and it was firing the correct time. Checked the compression on the cylinder and it was fine. BUT, he said it was still showing misfires on the scanner. He's recommending I go to someone else who could go deeper into the problem, like maybe the injectors.

Does this sound vaguely familiar to anyone? I just made an appointment for Thursday to bring it to the other shop my guy reccomended, so if there's anything I can tell him, I'd feel better.
 
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LibertyTC

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What year is your jeep? Can you add that to your signature line please.
Are you getting the correct Fuel pressure readings from rail in psi, key on, running and off for 15 min. What are the psi readings?
Generally speaking with a Snap On Scanner, you should also be able to view live data of injector pulses. You should be able to hear the tick from each injector on a mechanics stethoscope.
A compression test done, but what about a leak down test?

Re fire wow..not funny, smashing the smoking meter off the side of the house? EEK! Did you have home insurance?
 

GitEmSteveDave

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What year is your jeep? Can you add that to your signature line please.
Are you getting the correct Fuel pressure readings from rail in psi, key on, running and off for 15 min. What are the psi readings?
Generally speaking with a Snap On Scanner, you should also be able to view live data of injector pulses. You should be able to hear the tick from each injector on a mechanics stethoscope.
A compression test done, but what about a leak down test?

Re fire wow..not funny, smashing the smoking meter off the side of the house? EEK! Did you have home insurance?


Sorry, 2003 renegade 3.7. As for the rest, I'm not sure. He's a really busy guy, and he had her on the lift within a half hour of me stopping in. I'll ask the guy I'm bringing it to Thursday if he will check those things.

As for insurance, I rent a house on the farm my father and his business partner own. I have a lot of stuff, but honestly the most expensive thing I own is the Liberty. My TV is from 1996 and my laptop(which was with me), was only $250. The TV did not fare well:
You must be registered for see images attach

Most of what you see is the ceiling tiles the FD tore down to make sure there was no fire in the voids. I'm sure the ceiling tiles were asbestos or some other killer material which is why the studs are nice.
 

LibertyTC

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That was a hot fire, extensive damage,what an unfortunate mess.
You are at your friends place I take it, so you got a place to stay right?
I hope we can at least somehow help you to get the jeep going again...Will look to hear what happens on Thurs.
 

GitEmSteveDave

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That was a hot fire, extensive damage,what an unfortunate mess.
You are at your friends place I take it, so you got a place to stay right?
I hope we can at least somehow help you to get the jeep going again...Will look to hear what happens on Thurs.

Yeah, staying with a friend, but the sooner I can get a trailer or something set up at the farm, the better, as we like to have someone with the horses most of the day.

The upstairs fared a lot better, because two of the rooms had closed doors that were only opened after the FD arrived, so they have smoke/FD operations damage , but were relatively unaffected by the heat.
 

GitEmSteveDave

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Drove it to the mechanic this morning, and got a new code on the way:
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P0206: Cylinder 6 injector circuit. Showed the mechanic and he said he might even have a few in stock, so hopefully that is the problem. Since 1 & 6 are right next to each other in firing order, maybe 6 being bad is throwing 1 off. We'll see in a little while, but knowing my luck, you have to remove the roof or all the seats to get to the cyl 6 injector. :(
 
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GitEmSteveDave

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Just got off the phone with the mechanic, he said it might be a stuck valve in the cylinder. But there's no tapping sound or if it was a worn cam, then it shouldn't start out of knowhere. They're gonna remove the valve cover either tonight and tomorrow and try to get to the problem, hopefully.
 

GitEmSteveDave

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Just got off the phone with the mechanic. They replaced the injector, but the cylinder is still not firing correctly. They don't hear a tap, and they said if it was a worn cam, it wouldn't start all of a sudden. They think it might be a stuck vavle, so either tonight or tomorrow they will pull the valve cover to see what's going on.
 

LibertyTC

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GitEmSteveDave

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Brought it to a 3rd mechanic today. One of his guys seems to be knowledgeable about Jeeps and seems to know what's going on. Leaving it with him tomorrow morning.
 

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What help me was:
Fresh Spark Plugs should have been on the list 1st!
Use the Copper plugs listed under the hood with the correct gap.

Water coolant and oil can make there way past the coil seals "if you still have them"

While He's there make sure the many PCV hoses are not cracked and leaking vacuum.

Check all the battery cables & connections for rot & being loose. Starter connection too!
Charge the battery and check the charging system.

Changed my Gas Station!
 

GitEmSteveDave

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Got an update from Mechanic #3. Apparently the engine is delivering too much fuel to the cylinders, and that's what is causing the misfires.

It does make sense, as my tablet was showing double digit negative percentages (like -34%) for the trim in both fuel banks while I was driving it around from shop to shop, and would explain why mechanic #2 found cylinder #6 to be wet, even after doubly confirming the plug and coil were firing and fuel was being delivered.

This sound familiar to anyone?
 

LibertyTC

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Fuel Pressure regulator issue, fuel rail pressure test in psi, was that done?
 

GitEmSteveDave

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Fuel Pressure regulator issue, fuel rail pressure test in psi, was that done?

Not sure. I talked to him again last night, and I mentioned a regulator when he said its getting too much fuel, and he said he was going to put it on the computer to check the pressure next. Hopefully will get it back today.
 

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