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Engine Runing On 3 Cylinders
http://gt4dc.co.uk/forum/viewtopic.php?f=2&t=3212		 Page 1 of 2
Author:  Exup [ Thu Oct 01, 2009 8:13 pm ]
Post subject:  Engine Runing On 3 Cylinders
Can anyone help?

My St185 started runing on 3 cylinders yesterday, i could smell something burning and found the lamba sensor insulation melting. Today i replaced the sensor, but it still runs on 3 cylinders and the engine management light is still on. Anyone got any ideas what the problem is, i just got it on the road this Monday.
Author:  Loosey [ Thu Oct 01, 2009 9:41 pm ]
Post subject: 
Exup,

Have you checked the error codes to see what the system is flagging up?

That is always a good place to start, failing that have you checked the obvious things such as your spark plugs?

If you need help on checking error codes i think our site http://www.gtfours.co.uk/ has the process under the how to section.

HTH
Author:  Exup [ Thu Oct 01, 2009 10:01 pm ]
Post subject: 
I have checked the spark plugs, they are ok, im going to replace the leads next.
Author:  Muddy Water [ Thu Oct 01, 2009 10:39 pm ]
Post subject: 
Have to agree with Loosey here...first thing to do, before replacing things, is diagnose the problem flagged by the engine check light.
It is relatively simply to do - a peice of wire bridging a couple of terminals in the diagnosis box/unit and counting the flashing of the engine check light in the dash.
Author:  Exup [ Fri Oct 02, 2009 7:10 pm ]
Post subject: 
I have checked the fault codes that flashed, 22 open or short in water temp, sensor signal (THW) 35 open or short in turbocharging sensor pressure signal (PIM).

Is this enough to stop it working on 4 cylinders?

I have replaced the leads today, no difference in the runing (3 cylinders).

What do i do to get it runing on all 4 cylinders?
Author:  Nibbles [ Fri Oct 02, 2009 9:33 pm ]
Post subject: 
Sounds like a wiring fault, maybe an earth fault.

From the top of my head, there's a heavy earth from battery to gearbox, another from battery to body, and one from the alternator to body by the o/s suspention turret. Also, there's an ECU earth on the underside of the inlet manifold which comes out of the bottom of the wiring loom which runs across by the injectors.


From the melted lambda sensor, I'd also say theres a possibility of a burned out engine wiring loom. If one cable overloads & melts it tends to melt loads of wires together.

Have you been doing any work on the car recently which could have disturbed the wiring ?
Author:  Exup [ Fri Oct 02, 2009 11:37 pm ]
Post subject: 
I will check the earths, engine was replaced 2 years ago, i will look at the earths.
Author:  Exup [ Sat Oct 03, 2009 6:52 pm ]
Post subject: 
I think i have found the problem, one of the the temperature switches on the water outlet pipe has broken along with a sensor wire. There is quite a few sensors on this pipe, unfortunately my Toyota dealer doesn't list it, as his computer only shows a english market st185. One of these sensors is £75 i have orderd one but not to sure if it is the correct one as my car is a JDM.

I hope i haven't damaged the engine.
Author:  Kris [ Sat Oct 03, 2009 7:34 pm ]
Post subject: 
I doubt you have damaged the engine... this picture might help, it's from a 165 but the layout is very similar on the 185...

Image
Author:  Exup [ Sat Oct 03, 2009 7:56 pm ]
Post subject: 
Thanks for the picture, it's the EFI water temp sensor that has broken. The wire to the water temp gauge broke, but i have now repaired that.

Do you now if the St205 system is the same?

Thanks for your help!
Author:  Kris [ Sun Oct 04, 2009 12:00 am ]
Post subject: 
The 205 is a bit different... not CSI (Cold Start Injector).

"Think" the 205 only runs one sender for temperature...

There is no BVSV on the 205 either
Author:  Strontium Dog [ Sun Oct 04, 2009 11:54 am ]
Post subject: 
Exup wrote:
One of these sensors is £75 i have orderd one but not to sure if it is the correct one as my car is a JDM.



:shock:

You might want to post in the wanted section on here Mate. I, for instance, have loads of 185 bits and bobs and would likely give you a sensor if you needed one! :wink:

You have to wonder why the lamda wire melted don't you? I have never seen one melt except from overheating as they carry no current in a single wire 185 type probe. Funny you don't have an error code for the lambda too and none of the faults you have found sound like they would effect only one cylinder! :?
Author:  Nibbles [ Sun Oct 04, 2009 2:55 pm ]
Post subject: 
I was also concerned about melted lambda sensor, I was assuming it was a type with built in heater as some 185's had these AFAIK. Could also be an indication of very high EGT which may have caused engine damage.

If you have the ability to do a compression test it would be worth doing to diagnose melted piston / broken ring/ringland or burnt/broken valve.


Worth doing the easy stuff first before assuming the worst.
Author:  Exup [ Sun Oct 04, 2009 6:46 pm ]
Post subject: 
The lamba sensor insulation started melting, i've replaced it with the exact type, i have another one with more wires from a St205. I thought it was going to be a simple repair, but i started looking at the fault codes and a better look around the engine bay and it just doesn't look 2 b a simple problem to resolve.

This car was only put on the road last week with my engine from my old scrapped St185, it was runing fine in that!

I have run the car without number 1 plug in and i appear to be getting a lot of compression being compresed out of that cylinder. I will have to do a proper job, fingers crossed it's not terminal engine damage as i'm unemployed!

I have orderd a replacement part, just hope it's the right part and in future ask on the forum if anyone has the parts i require.

Thanks for your help guys!
Author:  Exup [ Mon Oct 05, 2009 7:06 pm ]
Post subject: 
I have done a compresion check on all 4 cylinders and all 4 clinders are kicking out 153 psi. As this is the case i dont think that the engine is damaged.

So i hope tomorow that the sensor i get from my Toyota dealler might go somewhere to resolving my problem. But their must be more to this than just replacing the efi sensor and soldering the water temperature wire together.

I have checked the earth wires, all ok.
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