Cylinder Misfires

Maybe you meant a centimeter?

You're well shut of him; guy's an idiot.

 

Well, the vehicle is used daily for delivery. Since the post on 8/26 there is an additional 1k miles. There are no issues with rattling/shaking after the BARS treatment as coolant is not getting in the combustion chamber or leaking. No plugged heater core or any other woes. I hoped to get 5-7k miles before I'd recommend it and get blacklisted here

Some possible keys to success so far were to take the heat and stress off the engine and its head gasket. The EGR and new water pump and thermostat DIY have lowered operating temps significantly for me. I'm crazy but i also drive the car now in ECO mode as when I was testing engine temps the Power mode was too easy to over throttle the engine (more heat) with my lead foot. I USED to exclusively drive in Power Mode. The coolant with the BARS was drained and refilled after several days and heat cycles. It was important to follow all initial instructions properly. Unrelated to you, I also had a small leak at my heat exchanger bypass (you won't have this) after mistaking a curb for a driveway. My point to that is I may have had 1.5x coolant drain after BARS treatment.

I am wondering how soon the BARS will fail. I will update you when that happens. (Car runs amazing).


P.S. To do engine work I have seen nothing that indicates risk in the topics we have been discussing. However, if you mess with anything energized or orange cables. Disconnect the 12V and the Hybrid battery cutoff switch. I'm sorry the local mechanic is hybrid-averse. I need to re-read this thread to see if Toyota quoted you a price to do the HG.

 

My initial HG leak was like this. Ironically, it stopped for a bit after the EGR, then it returned about twice as bad but still a small leak overall. Way more significant shaking as more coolant was getting in the cylinder.

Did any of the cold start shaking return?

How many miles per year do you anticipate driving?

 

Ambient? No. Ambient will change 30-50 degrees. The engine will change 110-150 degrees. So when you check matters.

 

Entrained gas is possible

 

Alright, so the official results are in. 2 Months and approx 5,000 miles before the stop leak failed. I was aiming for 10k miles but it just wasn't in the cards. Next up is the full head gasket replacement as a DIY, although I am checking with a trusted local shop, and a machine shop. Just wanted to update you in case someone considers HG sealer.

 

Your experience is often repeated but rarely documented as well as in this thread.

Conventional engine logic often fails on Prius hg when they seal themselves after 1 minute of operation. New plugs burns it off fast for awhile.

Getting bad when noticed at traffic lights. One sealer to go. Lots of guys say it works for years.

Acceptance at last. Most likely coolant level is dropping and revs generates white smoke an average tech would recognize. Months after first symptoms.

My experience is a head gasket at first sign might work but the long lasting repair is a professionally rebuilt engine which includes revised pistons, rings and head gasket.

 

Yikes - I never got the coolant in the oil so if i were you i wouldn't drive it or change the oil and get it over to the repair shop quickly. If you decide to do DIY let me know.

 

During a protracted cold snap, single digits, the Grand Caravan (V6) once exhibited a misfire and (impossible to service) rear bank external coolant leak that disappeared with ‘normal’ operating and ambient air temperatures. Never re-appeared. Good luck.