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For those people that don't like changing spark plugs
IMG_4268.JPG

130,000 miles
This plug had swelling of the threads at electrode end, a horrible mess and Very difficult to remove.

Even the "recommended" plug change interval is far too high for these engines..

Looking at this, makes me see a plug change every 80,000 on the maximum side..

To assist with removal of a stubborn swelled plug, Bring to operating temperature, ride to a store and back should be enough, then remove plugs..

Expands the cylinder head..

They will be HOT, but hopefully saving your cylinder head threads..

Back n Forth (loosen tighten, loosen tighten) loosening a bit further each cycle.. Save your threads..

We may want to post this for others to see, many people don't change spark plugs.. 馃憤

image courtesy of Fadedlights
 

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For those people that don't like changing spark plugs View attachment 59898
130,000 miles
This plug had swelling of the threads at electrode end, a horrible mess and Very difficult to remove.

Even the "recommended" plug change interval is far too high for these engines..

Looking at this, makes me see a plug change every 80,000 on the maximum side..

To assist with removal of a stubborn swelled plug, Bring to operating temperature, ride to a store and back should be enough, then remove plugs..

Expands the cylinder head..

They will be HOT, but hopefully saving your cylinder head threads..

Back n Forth (loosen tighten, loosen tighten) loosening a bit further each cycle.. Save your threads..

We may want to post this for others to see, many people don't change spark plugs.. 馃憤

image courtesy of Fadedlights
I had my spark plugs changed at 115k mile service. At 12X,XXX miles, I started experiencing what was diagnosed as misfires on two of the engine cylinders. The head gasket was replaced, and two weeks later my engine threw a rod. Not sure you鈥檝e struck gold with the spark plug/coil theory, but good luck..!
 

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Anyone hear of the TSB from Lexus L-SB-0174-17 I'm told it relates to the hard knocking after a "cold soak" some have written about in the thread. It seems it takes some reprogramming to fix the issue. Something to do with flash codes is the way I understand it. Just curious if anyone has had this done and if it fixed the issue?
When my vehicle first started experiencing the misfires, the dealership conducted this tsb. It did not fix my problem. I went back, and requested a compression test. The test showed two of my cylinders were experiencing misfires. I had the head gasket changed, Lexus paid for labor and I paid for parts. Two weeks later, engine threw a rod. 馃槙
 

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Sorry to hear of your misfortune..

We can Duplicate Exactly, the bang in question that takes the engines out.. Simply unplug a coil.. bang bang..

By the time a CEL is thrown, it's Too Late.. explosions in the head take out the gasket, undue stresses on wrist pin with all the banging takes your rod out..

I will be posting Why the dealers are playing surprised later..

You had plugs changed..
What fires the plugs?
(improper coil reinstall -clip connection -broken wire -cracked coil, improper handling at service)

Longer it bangs, the more damage that occurs.. Big time on the wrist-pin..

The TSB Crabapple posted is referencing a Problem in the CVT eTrans because of the banging, has nothing to do with fixing the banging engine.. it's a result from..

Stay tuned for a post that will be Removed by administrator / Lexus / Toyota
 

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Typed this up a week ago, but with Mevadus's post of almost exactly what i typed up- Had to post it..

脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳
This post is unsettling, to those that experienced the financial loss..

Keep in mind, i mentioned in post #50 maybe it's Thermal.. Get back to that in a second..

?? Why is it ??
Lexus / Toyota techs unable to duplicate the engine bang, to warrant TSB Solutions and ALERT the customers of a Service Change Order

(i did it in less than 10 posts)
They don't want to, way to much service profit 馃挵

They play it down with "Hugh Really never heard of that", no engine codes so have to wait.. and they wait.. they wait for the $$

Let it bang away until a CEL is thrown, by then it's usually Too Late.. Undue stresses on the wrist-pin, and the head gasket is usually gone by that time leaking..

But they'll go ahead and get the "maybe it's this" manifold Profit $$, to show good faith they cover upto 1/2 the costs, knowing more cash is on the way now.. They'll get that back real quick anyway..

Banging takes out the cylinder head gasket, firing in the head heats the head to fast and uneven out of design spec. Metallurgy (here's that thermal)

Then they get head gasket repair Profit $$

They still know there's more Profit coming down the road, with all the banging stressing out the wrist-pin to connecting rod, (just a matter of time) so a bit more waiting..

Then the engine throws a rod, taking out the block

Do i really need to say more?
脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳脳

Everyone- posts #57 & #58
save, copy, print, remember..
 

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My oem plugs came in yesterday
View attachment 59909

Decided to take a Look at the gaps
Holy crap - .034 .038 .040 .037
that's NOT "pre-gapped" and out of specification for my 2014 ct200h..

Only one (1) plug was within spec "?"
That's a Problem

And two iridium tips were cut at an angle instead of flat topped.. Considering using a needle file here, it's that bad..

Okay let's, Do the math
1mm to 1.1mm gap Required
  • 1mm = .0393 min
  • 1.1mm = .0433 max
.0413 = Dead Center

Gapped all to .041
(pay attention to your plugs)
IMG_4314.JPG
 

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Just providing a chronological order of events leading up to the thrown rod...

Btw, I apologize, it was not the 115k mile service I had done when the spark plugs were replaced, that was on a different vehicle.

11Oct2018 (125,464 miles): Oil and Filter change. Spark plugs replaced. Customer states 鈥渧ehicle is shuddering when starting, giving it gas doesn鈥檛 help.鈥 Mechanic states 鈥渘ormal sound of MG1 and MG2 motors turning on. Condition does not last longer as vehicle gets older per Lexus.鈥

06Nov2018 (127,531 miles): Customer states 鈥淐EL on and VSC Trac Light on, please check and advise. CEL has been on and off since last visit 11OCT2018.鈥 Mechanic states 鈥渆ngine light wasn鈥檛 on at time of check. Stored codes for misfires in the computer. Performed bulletin L-SB-0174-17 for random engine misfire. Performed computer update. Never duplicated shudder on startup. Computer update will solve the misfire issue and possibly shudder on startup.鈥

26Nov2018 (127,877 miles): Customer states 鈥渙n startup engine is knocking/running rough. Coolant reserve tank empty. CEL went on and came off. Please check and advise.鈥 Mechanic states 鈥渃racked head gasket is cause. Replaced engine cylinder head gasket.鈥

20Dec2018 (129,526 miles): Customer towed vehicle in. Vehicle won鈥檛 start and may have cam shaft issue. Mechanic states 鈥渢iming chain broken due to #1 and #3 piston failure. Recommend engine tear down to assess further damage.鈥

So as you can see, I had engine misfires prior to having the spark plugs changed. I would say I took the car in within a week of first experiencing the misfires. Prior to the misfires I had put 17k miles on the car, including driving it cross country, with no issues.

Tonight I had the tires replaced on my wife vehicle, and was mentioning the misfortune of this vehicle after the manager told me about a Prius that had come in yesterday with a piston rod protruding out the side of the block. That鈥檚 what made me think about checking this forum again. I felt terrible for the girl who had her dads car towed in, and I know exactly what they must be going through right now. Very disappointing....
 

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Recommended plug change and possible coil testing, should be announced as a
Service Alert Change Order
at every Lexus / Toyota service center, and customers notified

Myself every 80,000 maximum

changed mine at 71,000, already heavily Burnt ceramics "?"

Burnt ceramics breaks down the insulating barrier, it's porous as it is under the polish, now add normal motor vibrations, this causes pitting in the polish for stray voltages to escape, well that's the main insulator for the plug core itself.. Hello 馃

71,000 miles and my plugs were done -Burnt- Mild grandpa driving..

Glad i decided to take a Look around this forum, ponder, start researching, and solve for X, i would never had known -until it was too late..

EGR can pipe and valve, that's all good -for Every Car on the road.. who cares, a cel will pop alerting you to EGR restrictions, save cash clean it then.. it's Not the cause of the Bang Bang

Need Club Lexus and Prius forums to be notified of my posts here, at Least #57 and #58
Coils should also be tested for proper resistances as well, just to be on the safe side.. they Do fail..

Fadedlights has had no issues since replacing plugs, back on the road 500 miles and counting PM'd me today, Nice and smooth again 馃憤 glad he saved his threads

Thanks for the details Mevadus
it was already Too Late when plugs were changed.. which is why my research is so important.. Most will notice and continue on till they Find Time to drive it to the dealership.. sad.. the head and gasket were already going out -thermal- and letting it drive off uugh.. matter of time, wrist-pin..

for those that don't know what a wrist-pin is, piston to connecting rod is held together at the wrist-pin by little circlips, banging takes this out and, well you get the idea..

An event Exactly as i described, will happen..

Can not let these "sensitive" engines bang

Thanks everyone, for replying reading yakking, and tell Everyone who has a hybrid Toyota or Lexus (even Ford has an Atkinson) we have an expensive problem, that Can be Fixed simply..

Change those plugs
Ensure gaps at .041
 
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