Need source for aftermarket ignition coils

To confirm the problem is the coils, swap cylinder # 1 & 2 with # 3 & 4.

 

I got mine from Autozone for $240 plus taxes came to $258.59

They got them for $235 right now.

Lifetime warranty and if you ever have one that fails just go into the local Autozone and switch the bad one out right there.

I carry the tools I need in the car for that reason, I can go anywhere and if they go bad I just find an Autozone.

You cant go wrong and call it a day.

 

That price is for all four but as sugested do the switch around to confirm its the coils.

Otherwise if the misfires still happen on 1 and 2 you have a bad headgasket.

 

Does that mean the codes were P0351 and P0352?

It's always more helpful to tell us what the codes are (we can look up what they mean), and not just give some version of what they might mean and make us try to remember what codes might mean that.

If you had the P035x codes, those are about the ignition feedback (IGF) signals the coils send back to the ECM. The codes could mean the coils are bad, but it's never a bad idea to rule out some simple issue with the wiring in the IGF circuit.

 

I have doubts that it is truly a coil problem... but here's what you asked for:

rockauto.com has genuine Denso 6731310 coils for about $56 each.
That's the best aftermarket brand for a Prius, and Rock has a reputation for selling the genuine article at the low end of market rates.

Amazon and eBay have a serious problem with autoparts counterfeiters, particularly with electrical items. It is possible you will see the same Denso item listed on Amazon. If the price is much lower, it is probably a fake.

 

They read your codes and then gave you a report that didn't tell you what the codes were? Nobody needs to stand for that.

 

It's highly likely you just have misfire codes and you'll be wasting money by not diagnosing it properly, which is fairly easy (swap coils like post#2, clear codes, read new codes). What are the chances two coils went bad at the same time?

How many miles? You are right to be scared that it's a head gasket unfortunately.

 

What’s the miles on it? If 150k or more, odds are good it’s head gasket.

definitely try the post #2 suggestion first.

 

That's why it sucks not having the codes in the report from Autozone. If they were P030x codes, those are just generic misfires detected, while P035x codes would be about the ignition confirmation signal from the coils.

 

Yes and no. It does stay bad, but it only feels bad first thing in the morning because it needed all night to leak enough coolant into the combustion chamber to create the misfire/hydrolock condition.

It's still leaking, just not fast enough to sustain the misfire.

You use Toyota Techstream software to tell the management computers that you want to do a compression test. It will then spin the engine without tripping the plugs or injectors.

 

For what it's worth, using Techstream with a Mini VCI or with a Tactric Openport 2, I've never been able to make that actually happen. Maybe it works right for people using some other dongle, like the $500 one Toyota recommends.

 

Common gen 3 head gasket failure point is the wall between cylinders one and two, towards the exhaust side.

 

The valves are likely fine. But reseating them in is easy and you can do it yourself.
1qt at every 3000 miles isn't too bad....
216,000 isn't bad either.
But it would be better to replace the short block than do pistons and rings. You'd have
to check the cyclinders for scoring and out of round, which could be possible, and likely.

A remanufactured engine from the Hybrid Pit would probably be your best best. Around $2500.00

 

Classic early head gasket symptoms. If your coils or plugs were bad it would not clear up or be as random.

You need a borescope test to confirm. Yes you would be better off with a rebuilt engine or at least a JDM engine you are sure is not just US salvage.

It can get worse


Shudder video
“Hey Walt… they want to wait and see if it gets worse…”

Car Care Nut HG Borescope at 7:40