MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Fri, 02 Aug 2013 21:34:59 GMT

Okay so I just changed the ignitor module and coil without doing the rewiring of the melted O2 sensor plug yet and it looks like the over fuelling issue has stopped. Started the car and it doesn't smell of fuel at all and doesn't seem to be running rich anymore on start up. This doesn't really make any sense to me how the ignitor module or coil could have caused so much unburnt fuel. It seemed to have plenty of power and wasn't misfiring under load where I would have expected to see the issue if the coil was bad. If it was getting that much unburnt fuel at idle and low down in the rev range I can't wait to take it for a drive now!!! " />
The only reason I changed the coil and ignitor module was because the car switched off when driving and the ECU registered a fault in the ignition circuit. So I knew either the coil or ignitor was dodgy because the circuit was breaking when heating up. If that didn't happen there is no way I would have pinned either one of these as have causing my over fuelling issue.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Tue, 23 Jul 2013 08:47:02 GMT

Attached the link below.

http://www.ebay.com.au/itm/5-Kit-4-Pin-Way-Waterproof-Electrical-Wire-Connector-Plug-/321036979529?pt=LH_DefaultDomain_15&hash=item4abf4b8d49

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (Blue2)

Mon, 22 Jul 2013 23:14:04 GMT

I will have a look tomorrow and let you know. I know the harness going to the o2 sensor has 2 black, a brown and another coloured wire I think.

Which link did you buy it from? Can you send it to me

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Mon, 22 Jul 2013 08:01:06 GMT

Not a problem mate. I picked up an ignitor module from ebay for cheap, same with the coil.
As for the plug, I bought 4 pin connectors from ebay. Basically 5 water proof plugs for $5 delivered to Aus from HK.
If you O2 sensor is alright, I'd just change the connector over.
Do you have two white wires and two blue wires comming out of your O2 sensor. What color wires do they match up to on the other side of the plug? Is it blue to red and white to black?

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (Blue2)

Sun, 21 Jul 2013 21:42:38 GMT

Sorry mate. Let me know if you still need it. Im in Sydney.

Where are you getting the plug for the o2 sensor from? Mine is partially melted. I am going to get another o2 sensor tomorrow but will have to cut and join. I cannot disconnect it but can still see the wiring colour.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Sun, 21 Jul 2013 19:38:13 GMT

No, the problem is the connector on the O2 is completely melted so I will have to cut the wires to disconnect. I plan on cutting and rewiring with new plugs when I get some in. Might be a bit hard working out which wire is connecting where given the connector is badly melted.
I'll need to check if the car is over fuelling at low revs because the car seems fine. It starts fine, drives fine etc...Just need to keep an eye on the oil and see if the fuel is dumping in. Either that or get it to a mechanic with a dyno to check the air/fuel ratio properly. I go based on plug color currently to work out if rich or lean.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (Mrskylighter)

Sat, 20 Jul 2013 20:52:18 GMT

Did you try running it without the O2 sensor plugged in?

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Sat, 20 Jul 2013 18:44:26 GMT

I PM'd you but didn't hear back Blue2. I ordered in a new coil and ignitor module anyway.
Refilled the car with new oil today and started this morning. All seems good, car was idling fine. So I did a compression test, however the engine was still relatively cold as I had only run it and reved it for a few minutes.
No oil is coming out of the turbo seal anymore, must have just gone too thin.
The compression test of a fairly cold motor came back as 125psi on two cylinders and 130psi on two cylinders so all seems alright. If it was run when hotter might have bumped it up a bit more, main thing is its all even, so nothings destroyed.
In a few weeks the new ignition parts will arrive so I just need to track and monitor what made it over fuel. I checked the plug colors a few weeks back when hot and all were orange/brown so it must be happening in the lower revs or idle, so I'm thinking the melted O2 sensor plug is at fault. Possibly crossed wired.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (Blue2)

Thu, 18 Jul 2013 23:24:48 GMT

Okay if ur igniter is dead let me know. I have spare one as I did coil on plug so took mine out.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Thu, 18 Jul 2013 22:58:10 GMT

Hi,

All cylinders are getting spark. The car actually starts and drives. Under throttle it seems to drive fine. however in lower RPM I suspect its over fuelling. The catch can is clean however could be due to the setup I run wit the catch can.
The crank surge is more the rings scraping the bores. Basically because the oil was a 50/50 mix of fuel and oil and the cars over fueling so much it is washing the cylinder bores clean of oil and diluted the oil to be incredibly thin. It like starting the car with petrol in the sump instead of oil.
The oil/fuel leak is isolated to the turbo seal so it hasn't made its way to the throttle body or intercooler even.
I'll run some diagnostics to see if I can work out what is causing the over fueling. However it has another issue in the coil or igniter needs replacing. So I'll swap both out and go from there. Got a lot of tests to do at the moment.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (Blue2)

Thu, 18 Jul 2013 22:50:17 GMT

I had this exact same issue.

1. Check to see all cylinders are getting spark by removing the lead and putting a spare plug in and try cranking
2. Your plugs by now are rooted. Swap them out
3. Dump your catch can and clean it out as well as then hoses for where it got flooded
4. Check your relays and fuses in engine bay. I tested each one by one for open and close relay etc. Check the fuel pump or injector relay also.
5. The cranking surge thing is electrical. You tapped into a wire in engine bay could be that. Try adding earths from engine to chassis.
6. If you Did have spark and swapped the plugs and able to start it. Add engine flush but do not rev. Dump the oil and change filter.
7. Carby clean the throttle body after you added new oil and filter. Rev it and spray it.

That should help.

But the starting and power loss is electrical.

I wasted 6 days in a row and went back to basics then solved my own problem.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Thu, 18 Jul 2013 22:46:15 GMT

Thanks for the link Mrskylighter. That diagnostic site is awesome!
One I get another oil filer and complete an oil change and some other tests I'll check O2 sensor. Basically the plug is melted and terminals are sticking out. Could be the problem. I still suspect the igniter or coil to have failed the other day so I will change both aswell.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (Mrskylighter)

Thu, 18 Jul 2013 22:33:56 GMT

Try unplugging the O2 sensor and run without it for a while. You will get a fault code come up but the car will drive fine. It will just use default values for O2.

But if the wires are shorted than yeah it might think its running lean alll the time.

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (track_mr2)

Thu, 18 Jul 2013 22:13:52 GMT

Okay so continued stripping the engine tonight. The oil/petrol mix was isolated to the turbo seal it didn't make its way to the intercooler or intake. However when I dumped the oil it was basically a 50/50 mix of oil and petrol!!!" />
About 9 liters of oil/petrol came out and it poured out like water. Hopefully the engine isn't destroyed, I'll have to do a compression test. Luckly though I bought a set of forged rods and pistons last week before the AUD drops even more. So I got a set of forgies sitting here if I need to rebuild.
the big question is what has caused the car to over fuel so much? It doesn't seem to have dropped power in the upper RPM range, it seems more isolated to start up and possibly low rpm. Most likely dodgy O2 sensor? I have no fault codes for it. The plugs to the O2 sensor melted at the track in the heat, so possibly crossed wires? Could that set a positive signal to tell the ECU to constantly fuel during closed loop?

Re: MR2 Gen 3 Turbo error code 12, oil/fuel out of turbo (Mrskylighter)

Thu, 18 Jul 2013 16:55:22 GMT

Also your engine won't run with the map sensor unplugged I'm pretty sure.

If you were going to do a pressure test I would be doing a compression test to see how healthy the engine is.