10-4. Thanks guys

 

I've been kinda "unofficially" compiling data on this and in almost every case where a cylinder failed and I'm talking like died dead failed, the owner has either up front stated that they mainly use 87 octane gas or has later admitted it. A lot of valvetrain related problems been reported by 87 octane users, right down to blown pistons.

Will you have a catastrophic engine failure if you only use 87 octane? Maybe not, but I'm 100% convinced your odds are considerably higher...

 

I agree with everyone else that your engine is not toast and there is some other issue ging on. If your engine was locked and wouldn't turn over, then your tires would have been screeching from being locked up. The transmission is run off the rotation of the engine. No rotation when in drive means you go nowhere.
Could be a simple fix like the pcm/ecu or even an ignition switch.

Any engine that I have seen apart that had been run off 87oct has had tons of pre-detonation gouges out of the piston which makes for lots of hotspots and then cause further problems. Even more so if you continue to run low grade gas.

 

Recently, FireFighter unfortunately had a broken spring.
Would 87 octane cause his problems?
Al.

 

Um 87 octane is fine with the 5.7. under normal conditions. If your towing or hauling heavy loads then 89 would be better. The knock sensor and computer will compensate for the lower octane by retarding the timing = lower power output and lower fuel economy

*Edit - Also if your a led foot or have a high mileage with lots of carbon build up then the higher octane that is recommended will be better.

 

Wow. Ok, 89 upgrade it is. Great, at another .17 per gallon, but that's cheaper than a burned cylinder. I'm not towing, etc. Just mainly alot of miles per week, normal conditions.

 

at least you're not in the UK. Al, what do you pay for petrol over there? lol

...talk about a thread jack

 

Um, the manual may say that, but unless you've seen the inside of a few Hemi's with cylinder damage and have verified that in EVERY case the owner ran 87 octane exlcusively, then you go right ahead and believe everything Chrysler tells you.

They also swear they've never seen a retaining clip fail in a Chrysler LSD also...

And FireFighter, I've done the math, although it's scewed because I did it while running a superchips tuner, but running 93 octane fuel with the performance tune yielded the best cost per mile driven of any of the scenarios I tested, 87 on 87 tune, 89 on stock, 89 on 87 tune and so on. So you may pay more per fill-up getting 89 octane, but your mpgs will probably off-set the cost difference...

 

Not debating what you have seen but I can tell you that it has allot to do with a) driving style b) operating conditions c) quality of fuel d) mechanical condition of components such as knock sensor, egr, carbon build up, spark plugs etc. than just the 87 octane fuel itself.

I run 87 just putting around town and 89 when towing.

 

my 04 hemi crapped out and it was the number three piston and an exhaust valve. i fixed it myself and built it a "lil"