Misteryous misfire on cylinder 1 - ZT 190

Gentil79 · 13th March 2017, 12:00

Following up in another thread, after I installed the refurbished vis motors, I used a generic code reader and it says that there is a misfire on cylinder 1. NEw plugs, swapped coils and cables... nothing. Still the damn misfire on cylinder 1 and the code reader says it fails to read the o2 sensor... but not showing showing up as an error in the céu... could this cause the misfire on that particular cylinder?
The car had a t4 session a couple of months ago and it was all fine even though the balance VIs was faulty. Isn't a bit strange that after I put a working vis, that the fault comes up? It passed the mot on the beginning of December.

Gentil79 · 14th March 2017, 18:09

Well, it's not good news.
Did a compression test and cylinders 2 to 6 gave a reading of around 170-180, the cylinder 1 gave around 100. Poured a teaspoon of oil into it and the compression jumped to the same as the other cylinders.
Question now is:
Change the oil to and add an additive to help recover some compression, or sell the car?
Repairing it would be expensive, I assume.

Gentil79 · 14th March 2017, 21:04

Any ideas?

Doc Evil · 14th March 2017, 22:44

Is the engine tappety if you have a lazy lifter which isn't allowing the valve to fully close then a good oil change may help but if it's failed or burnt valve, worn rings/bores etc then oil change won't make any difference

Gentil79 · 14th March 2017, 23:04

Quote:

Originally Posted by Doc Evil

Is the engine tappety if you have a lazy lifter which isn't allowing the valve to fully close then a good oil change may help but if it's failed or burnt valve, worn rings/bores etc then oil change won't make any difference

Not tappety at all. The compression test suggests worn rings after compression went up when I put a bit of oil in te cylinder. A burnt valve would mean the same compression reason m, either wet or dry.

Doc Evil · 15th March 2017, 07:16

True then I think you already know the answer to your question oil change at best would be a temporary cure
Depending on how much you want to keep the car engine rebuild would cost considerably more than replacing the engine with one from someone like Sean Carter but a rebuilt engine would give you many years of reliable service

Gentil79 · 15th March 2017, 10:04

Thanks. I'll just run it until it goes. I have other priorities at the moment, so cars have to wait for now

13th March 2017, 12:00	#1
Gentil79 Avid contributor MG ZT Join Date: Nov 2016 Location: Cobham Posts: 108 Thanks: 22 Thanked 12 Times in 11 Posts	Misteryous misfire on cylinder 1 - ZT 190 Following up in another thread, after I installed the refurbished vis motors, I used a generic code reader and it says that there is a misfire on cylinder 1. NEw plugs, swapped coils and cables... nothing. Still the damn misfire on cylinder 1 and the code reader says it fails to read the o2 sensor... but not showing showing up as an error in the céu... could this cause the misfire on that particular cylinder? The car had a t4 session a couple of months ago and it was all fine even though the balance VIs was faulty. Isn't a bit strange that after I put a working vis, that the fault comes up? It passed the mot on the beginning of December. __________________ Gentil Gomes da Costa

14th March 2017, 18:09	#2
Gentil79 Avid contributor MG ZT Join Date: Nov 2016 Location: Cobham Posts: 108 Thanks: 22 Thanked 12 Times in 11 Posts	Well, it's not good news. Did a compression test and cylinders 2 to 6 gave a reading of around 170-180, the cylinder 1 gave around 100. Poured a teaspoon of oil into it and the compression jumped to the same as the other cylinders. Question now is: Change the oil to and add an additive to help recover some compression, or sell the car? Repairing it would be expensive, I assume. __________________ Gentil Gomes da Costa

14th March 2017, 21:04	#3
Gentil79 Avid contributor MG ZT Join Date: Nov 2016 Location: Cobham Posts: 108 Thanks: 22 Thanked 12 Times in 11 Posts	Any ideas? __________________ Gentil Gomes da Costa

14th March 2017, 22:44	#4
Doc Evil Gets stuck in Rover 75 1.8 Classic Saloon Join Date: Jan 2014 Location: Newton Abbot Posts: 823 Thanks: 46 Thanked 175 Times in 144 Posts	Is the engine tappety if you have a lazy lifter which isn't allowing the valve to fully close then a good oil change may help but if it's failed or burnt valve, worn rings/bores etc then oil change won't make any difference __________________ NOT EVIL REALLY BUT REALLY A DOC

15th March 2017, 07:16	#6
Doc Evil Gets stuck in Rover 75 1.8 Classic Saloon Join Date: Jan 2014 Location: Newton Abbot Posts: 823 Thanks: 46 Thanked 175 Times in 144 Posts	True then I think you already know the answer to your question oil change at best would be a temporary cure Depending on how much you want to keep the car engine rebuild would cost considerably more than replacing the engine with one from someone like Sean Carter but a rebuilt engine would give you many years of reliable service __________________ NOT EVIL REALLY BUT REALLY A DOC

15th March 2017, 10:04	#7
Gentil79 Avid contributor MG ZT Join Date: Nov 2016 Location: Cobham Posts: 108 Thanks: 22 Thanked 12 Times in 11 Posts	Thanks. I'll just run it until it goes. I have other priorities at the moment, so cars have to wait for now __________________ Gentil Gomes da Costa