[[ITA]SouthAlps]

First of all good morning everyone, my name is Paolo I am writing from Italy

I have a Chevrolet Camaro MK6 convertible 6.2 V8 LT1 with a Stage 2 ProCharger installed

I bought this car at 15,000km with this modification already installed

All maintenance was carried out for scruple when purchased. Now the car has 22,000km. I have carried out a complete engine service, 5w40 Liquimoly a service on the automatic transmission, a service on the volumetric compressor with ProCharger special oil for service.

I'll explain my problem to you three weeks ago when I started it one morning the MIL light (fixed engine failure) came on, the car was working correctly


The following errors came out in diagnosis:

P0420-P0430 (red color and active) connected to the catalyst

in memory instead P0113-P0480-P0691 (yellow color and stored)

I purchased a new and original lambda probe (oxygen probe that is installed behind the catalytic converter under the driver's side). During this process I replaced the oil and oil filter, deactivated all the warning lights and put the car back on the road after the diagnostics.


I drove 5km and immediately after the MIL light came on (fixed engine failure), the car continued to function normally

I drove about 350km in the next 24 hours when at a certain point

going from 150km/h to about 220km/h hot car temperatures ok perfect weather conditions I didn't write but I always use fuel with additive to improve the octane (so about 96 octane)

suddenly the car started to smoke white from the exhaust, the MIL (engine failure) light started flashing, the STABILITRACK also came on and the car started to malfunction, shaking and having a drop in power.

When we got to the shop we opened the hood the whole engine compartment was full of oil sprayed on the inside of the hood, on the supercharger, on the belt and on all the pipes everywhere. We lifted the car on the bridge and the whole lower frame and the exhaust completely covered in oil

We ran a diagnostic and P0300 (cylinder number 5 misfire) and U0401-71 (engine control unit error) and C0242 (traction control unit intervention in drivetrain) emerged.

We checked all the spark plugs, the spark plug of cylinder 5 is wet

we replaced the spark plug on cylinder 5 and it still misfires

We checked the electrical current on the coil/spark plug wiring and everything works fine

We swapped the coil of cylinder 1 with that of cylinder 5. Cylinder 5 still does not fire

after replacing the spark plug for a couple of minutes with the engine running and after giving a few accelerations the cylinder ignited correctly after which it turned off and the car lost power again

We are thinking of pulling the engine because we suspect the cylinder is damaged or a bent piston or valve.

I apologize in advance to all of you for my language but I use a translator I do not communicate in your language I was happy to share my problem here I also wanted to present my car which is now K.O in the workshop

[[ITA]SouthAlps]

Here I link the videos of the phases that I described to you

https://streamable.com/x52bex

https://streamable.com/wgiejj

https://streamable.com/xhzj4b

https://streamable.com/h1u07y

https://streamable.com/bcw3xa

[GreyGhost702]

It sounds like textbook head gasket failure. Do you have oil showing up in your coolant tank? Does the coolant look anything but cherry red? Have you drained your oil pan? Does it look milky or anything other than a transparent caramel color? How does the oil smell?

If I had to guess the timeline of events, I would say the gasket started to fail between the combustion cylinder and a water jacket, which started fouling your O2 sensors when coolant was being siphoned into the combustion chamber. As you continued to boost the engine, the gasket failure finally made its way to an externalized failure and sprayed fluid into the engine compartment.

Highly recommend discontinuing trying to run that engine. With coolant possibly mixing with the oil, you may wipe out your bearings in addition to the gasket failure, if they aren’t already damaged.

[[ITA]SouthAlps]

Thank you very much for your help.

The car is currently sitting on the bridge in the workshop.

What do you recommend?

Disassemble the engine and separate each of its parts to inspect cylinder 5?

or

Proceed with dismantling the cylinder head to fit the gasket?

[SomeGeoffGuy]

Pull the heads. You can check #5 with the heads off.

-Geoff

[Megahurtz]

As stated, pull the head. It's possibly a blown head gasket but it could also be a craked piston or ring. Any of these scenario's could introduce compression into the crank case and blow oil out of the PCV system/catch can.

[KingLT1]

You likely broke a piston.

[[ITA]SouthAlps]

Good morning everyone, today in the workshop we discovered the problem the piston of cylinder five.

I have a reasonable question for a comparison with all of you, can all this be the fault of too much power delivered by the PRO CHARGER on standard pistons? or can it be the fault of an error on the quantity of oil inserted in the engine 48 hours before the problem?

I have this question because when repairing the crankcase I don't know whether to replace two pistons or replace all 8 with forged pistons to understand the need to face the expense I am more for aesthetics than for performance here in Italy if you race with the car you will be criminally convicted

[m6-lt1]

Originally Posted by [ITA]SouthAlps

Good morning everyone, today in the workshop we discovered the problem the piston of cylinder five.

I have a reasonable question for a comparison with all of you, can all this be the fault of too much power delivered by the PRO CHARGER on standard pistons? or can it be the fault of an error on the quantity of oil inserted in the engine 48 hours before the problem?

I have this question because when repairing the crankcase I don't know whether to replace two pistons or replace all 8 with forged pistons to understand the need to face the expense I am more for aesthetics than for performance here in Italy if you race with the car you will be criminally convicted

The pistons in these cars can and will fail when boost is added if you add too much boost and not use the proper fuel system. I would add all 8 forged pistons and do a fuel system if it does not have one already.

[[ITA]SouthAlps]

Hi, do you have any advice on the devices to install?

In Italy, I have difficulty finding many replacement parts for this car.


Best regards

[SomeGeoffGuy]

Originally Posted by [ITA]SouthAlps

Hi, do you have any advice on the devices to install?

In Italy, I have difficulty finding many replacement parts for this car.


Best regards

Honest opinion - Just find a stock motor to put in it and get the dealer to reflash the stock tune.

If you want to keep the procharger (which I do not recommend for someone not in North America), then find a shop in the USA that will ship you everything you need, including a tune and a fuel system. It's not going to be cheap though!

-Geoff

[KingLT1]

High compression, boost, and pump gas isn't a great combination. These engines won't tolerate more than 12 degrees timing with 7-8psi of boost.That is a good indicator that the compression is too high for the fuel. Switch the fuel to E85 and now you can safely run 20 degrees and the engine is happy. If all you have is pump gas then it needs lower compression forged pistons.

[[ITA]SouthAlps]

Originally Posted by KingLT1

High compression, boost, and pump gas isn't a great combination. These engines won't tolerate more than 12 degrees timing with 7-8psi of boost.That is a good indicator that the compression is too high for the fuel. Switch the fuel to E85 and now you can safely run 20 degrees and the engine is happy. If all you have is pump gas then it needs lower compression forged pistons.

[IMG][/IMG]

I always add a bottle of this to every tank of fuel, common petrol in Italy is 95 octane, I always add one of these to improve performance

[arpad_m]

Originally Posted by [ITA]SouthAlps

I always add a bottle of this to every tank of fuel, common petrol in Italy is 95 octane, I always add one of these to improve performance

If this octane booster has MMT in it, you'll see orange residue on the plugs and in the exhaust system with continuous use, which is not ideal, plus it's technically illegal for road use even here in the US, I'd be very surprised if the EU allowed it...

For the record, 95 RON octane in Europe is equivalent to 91 octane or (RON+MON)/2 in the US, so it's not ideal but much better than someone using normal gas here in the US. That said, you should never even think of compromising octane level in a forced induction application where you're one tank of crappy gas away from piston/rod destroying detonations. Can't you get 98 instead of using an octane booster? I'm from Hungary originally and I know 98 is readily available there, Shell even sells 100 and 100+ octane gas at some stations.