A Jeep With A Misfire And It's Not The Coils, Plugs Or Injector - No Parts Required

In this video we have a look at a 2006 Jeep Grand Cherokee with the big 4.7 that came in with a customer complaint of an engine light and an obvious misfire at idle. This one was not your run of the mill bad coil pack or injector.
-Enjoy!
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

[@sixmile6433]

Never ceased to be amazed at Eric's knowledge! There's a reason his garage is the last stop for vehicle repairs - they get fixed!

[@TheDigitaldoug]

Eric just proves that nothing is better than a deep understanding and knowledge of how things are supposed to work.

[@elcheapo5302]

That was brilliant, Eric. If you ever get tired of turning wrenches, please teach the next generation of mechanics. You have so much skill, knowledge, and experience and a great way of teaching.

[@wyatthull6613]

Wait, what did he just say about companion cylinders, top dead center, and little buddies? Sometimes I think we forget just how good this guy is at nut and bolt mechanics. We love what you do Eric. Thank you.

[@erwinallen2309]

Eric always makes it look easy. Watching him do his work like child’s play has always been such a pleasure. Thank you for bringing us along.

[@johnhufnagel]

it's also amazing that it fell out and apparently did no damage to anything in the process.

[@kevinrenn9123]

Not sure what amazes me more, Eric O abilities or the lack of diagnosis skills at the other shops

[@stevenharris5162]

Eric O, I still like the small change in your sign off: "Remember Folks, if I can do it, you can do it, and if we can't do it, we'll get Mrs. O to do it." 😊

[@wallingj68]

The fix was very well done, but WHAT ABOUT THE LOW PRESSURE IN THE LEFT REAR TIRE! 🚙😱😁

[@gutsngorrrr]

Absolutely fantastic bit of diagnostics. Just goes to show what a real pro can do.

[@wandy4468]

Eric you're a living legend. The concept of cylinder buddies, oh man, only someone with loooong flying hours can connect the dots out of such pico graph result. kudos.

[@jakew9653]

That's insanity, rocker falls off and you can just put it back on lol these Chryslers never cease to amaze me😬

[@sylviaverrill6681]

Early morning video with coffee! Can’t beat it! 😊

[@lduplago]

Ability to diagnose is what really sets the mechanic from the diyer so far apart. I am amazed at your ability to diagnose! Love your videos.

[@GTCGreg]

Who'd of thunk you could find a valve problem by checking starter current, but that's why you're the best.

[@56clipperable]

As a Chrysler tech, the 3.7 and 4.7 are so common for the valve seats sliding out of the head and causing at best case spitting the rocker out. Worst case the seat gets out of position and then breaks (carnage ensues). Most common reason for the seats coming out is at some point it had got hot when the water pump failed.

[@michaelsaucier5633]

The original thumping noise in the beginning was a pretty good tell because that's the would-be exhaust being exhausted through the intake as the intake valve opens.

[@beachcouple1741]

“Just remember if I can do it you can do it”. You have got to be kidding me. If that were the case the vehicle would not have been to multiple shops and still not fixed. Your diagnosing skills are second to none. I just wish there was someone like you near me. 👍

[@huzudra]

I've had a few pop out on the 3.7 over the years, the root issue is the lash adjuster isn't staying pumped up. Best to replace that while the valve cover is off because odds are it'll throw the rocker again later when it fails. The little seal or valve inside the lash adjuster fails, intermittently at first. You can pull it and re-prime it with oil and it'll hold most of the time but keep compressing it and it'll just collapse at random. Eventually it'll start doing it pretty regularly. I keep a collapsed one in my box to show customers with ticking hydraulic lifters/lash adjusters and explain why changing their oil regularly helps prevent that from happening. That engine looks pretty clean so likely just a failed part. It's common enough on these engines they they make solid lash adjuster replacements where you set the lash manually like on a Honda and basically that's that until you need to adjust it again in 60,000 miles.

[@user-dt1gz6hh4x]

That customer is so blessed that didn’t destroy that cam shaft 🤞🙏they must have some good luck lol !!!