INFAMOUS PRIUS LEXUS ENGINE RATTLE SHAKE MISFIRE FIX

Many of you probably have or had this issue. I swapped coils first to see if the misfire would move but it did not, same with spark plugs. I first thought it was the injector. But what fixed it was replacing the intake, PCV, cooler and ERG.

[@waynes9163]

Success hurrah after all the attempts at diagnosing this rattling ice engine I finally fixed it?, it wasn't the intake manifold nor EGR valve nor cylinder head gasket or as I suspected a faulty Throttle Position Sensor. I am a retired mechanic with many years in industry so I may be rusty but I do know what I'm talking about and I hope this story helps others avoid getting ripped off. I had replaced the spark plugs in its service along with oil and filter, there was zero indication of a head issue as no fluid loss, no smoke from exhaust, no overheating, no oil in the water or visa versa, I did get a code multiple misfires which after clearing a few times settled on misfire detected on Cylinder 4 I moved plugs around but fault came back still saying no4 so I moved the coil packs and still it said no4 so not plug nor coil pack. I blocked the EGR with a thin blade and the fault was still there rattling and a new code "insufficient flow through EGR system" I removed the blade, I also removed the EGR assembly thoroughly cleaned it, and the pipe to the intake manifold and used long brushes to decarbonisation the manifold once removed, I also cleaned up the throttle body and bought the specific cleaner for the MAF sensor, all of the above were dirty and will have benefitted from the good cleaning but they weren't the cause of the shake rattle and roll between 1450-1550 RPM so what else was there?? the injectors are electronically controlled pulse so as it was an easy test I dismantled just enough to remove them and move the one from no4 and put it in no1 cylinder, reassemble clear codes and run engine, fault obviously still there but importantly the fault code had moved with the injector, just to double confirm I repeated this process this time putting suspect injector into no3 cylinder and sure enough the new code said misfire No3, so I ordered a aftermarket set which were about $80AUD delivered, I installed them this morning and once the system depressurised the engine ran smooth, I erased codes and disconnected both battery systems to enable the car to reset to factory, at least that's how some forums recommended a full reset, after reconnecting batteries and trying a few times to get car to start it finally did and was smooth so I boxed everything up final check for fuel leaks, all good, out to road test. instantly she felt like a new car switching between ice and electric smoothly, acceleration back to full power, cruising excellant, no sign of feel of a misfire, no rattles bangs pops or shakes, it quite literally was perfect and a massive relief I had finally found and fixed the problem, shame my ODBC which has the Lexus software installed couldn't pick up the faulty injector out of the gate would have saved soooo muuuch time and effort, all up though it has cost me several hours researching and testing but less than a couple of hundred dollars to fix, heaven knows what a Lexus dealership would have tried to screw me for. I just have one tiny issue since reconnecting batteries there is a warning "Check Hybrid System" which is odd as on road test pressing the DISP button with right thumb on steering wheel I can see the system switching exactly as it is supposed to charging discharging and switching ice to electric and back, I feel there isn't an actual problem because there wasn't prior and this is just something that needs resetting so a little more research unless anyone can give me a clue. I hope my story helps others having same issue, I thank all forum inputs but nobody suggested injectors so maybe this can be added to list to be checked when encountering this mysterious shake rattle and roll of the ct200h.

[@nasnas9336]

You have a different issue than what am talking about here. You obviously cannot tell the difference. An injector problem suer easy to solve as well as tell. If i had an injector symptom i would have gone to it first.

[@waynes9163]

@@nasnas9336 its the exact same rattle when cold, idle, low rpm as everyone is describing and showing in videos, odbc does not point to injectors so easily, maybe you have more experience with these hybrid Toyota's and know what is common faults but 99% of posts regarding these rattles do not go right for the injectors, I only saw one video where the guy mentions injectors I agree they are easy to fix once diagnosed which is why I posted my little journey, not saying your issues weren't different and your post is very informative, in any case my problem is fixed so I'm happy

[@Cablivi]

Hello are you talking about fuel Injectors?

[@waynes9163]

@@Cablivi Hi yes it turned out to be one fuel injector at fault, I replaced the set with aftermarket and it ran great again, we since sold the car and bought EV

[@paulvargas8454]

@@waynes9163this saved me…literally same thing and my water pump also failed. The fuel injectors were causing misfires and issues and because I drive 30k miles a year, the engine was abused. Forgot to constantly add fuel injector cleaner, but sure enough saw this vid and comment, replaced injectors. And she was good as new. Mine died while on the freeway which was scary but said check hybrid system and the engine just rattled and eventually died (I am guessing cause misfire caused timing issues).

[@ballysingh3718]

Was the car making a rattling sound like engine has gone ?? Regards

[@nasnas9336]

Yes

[@isaacbrown1106]

These cars need oil catch cans installed. I did all of the and it was dirty again 18 months later, oil everywhere. Installing a catch can so I don’t have to do this job again. Spend the $20 and be done with it.

[@MrLwii]

Any updates to adding the can? What type did you go with?

[@1HeatWalk]

In California, car can't pass smog with a OCC. Have to remove it before going to smog.

[@nevillebobeck4279]

Ｐｒⓞм𝕠𝕤𝐌