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[Doctor Gollum]

Wynns injector cleaner with some decent fuel would be a reasonable alternative if you're concerned about removing the fuel rail

[dave the builder]

Hi dave the builder

I have been thinking, that maybe they could be dirty. Have been looking at the kits, that fit onto the fuel rail and use pressure. But unfortunately don't have or know anyone with a compressor. I was thinking of taking the intake manifold off, as I cannot find the parts code for the O rings, so don't want to disturb the injectors and damage the seals.

part numbers on 7 zap
https://vauxhall.7zap.com/en/car/v94/g/0/32-1/
I've never damaged a seal removing injectors myself .

I didn't use any fancy kit to clean or test either ,
just a 9v battery ,some wire (to open / close) a syringe ,some hose and neat injector cleaner and a plastic tub .
I squirted cleaner in while opening and closing
I did  see some small debris in the white plastic tub

plenty of youtube videos 
 https://www.youtube.com/results?search_query=clean+injectors+diy
some videos use carb cleaner

[addy]

Thanks for the info dave the builder. I have a injector tester, that will do the pulse for cleaning them, bought it at the time, because the price was good. Justified buying it to myself, as a you never know .

Doctor Gollum the wife has only put shell or BP good stuff in it. Even when we had unleaded and Super unleaded.

I have been told by someone who owns a 2ltr, said the 2ltrs are prone to the valve seals going. Apparently he had it on his, which gave the same problem as mine, high Co emissions.  I have not heard of this before, has anyone else?  The seals were done on when the headgasket went, on the wifes 2ltr. Is it possible for a seal/s to go bad, even if service the car regular, due to the wife doing lots of travelling in it? I really don't want to disturb the head, unless I have to. If I remember, once the intake manifold is removed. I should be able to see the tops of the valves. My thinking is that if I remove the intake manifold, then I do a clean on the Throttle body, even though it looks ok. And also see the injectors.

[Nick W]

Bad valve seals are much more likely to raise the HC readings, not the CO

[dave the builder]

Wynns injector cleaner with some decent fuel would be a reasonable alternative if you're concerned about removing the fuel rail

That is OK if you can drive the car and get through the cleaner & fuel mix in the tank ,then put fresh fuel in
BUT ...
if the car has failed MOT ,it can't be driven legally (except to/from MOT ,private land)
I like to use injector cleaner a month before MOT ,then Cataclean the week before then fresh fuel
!/4 tank for each treatment till the light comes on

Bad valve seals are much more likely to raise the HC readings, not the CO

Indeed ,that is my experience

high hydrocarbons on a petrol engine tends to be valve stem seals,worn rings etc
even an oil change can bring the HCs right down

High CO i've found tends to be petrol related

Thanks for the info dave the builder. I have a injector tester, that will do the pulse for cleaning them, bought it at the time, because the price was good. Justified buying it to myself, as a you never know .

you don't need to justify your purchase to me  I have loads of toys . TOOLS i mean TOOLS ! 

...... I really don't want to disturb the head, unless I have to.

agreed , even if the valve stem oil seals had failed so soon , or popped off , once the engine was warmed up ,the oil would have burned off in my experience ,and as said oil burning increases HC ,not CO

If I remember, once the intake manifold is removed. I should be able to see the tops of the valves. My thinking is that if I remove the intake manifold, then I do a clean on the Throttle body, even though it looks ok. And also see the injectors.

I can't guarantee cleaning the injectors will solve the issue sorry , it's just advice i'm giving based on my experience 

but ... clean injectors will give a better hotter burn 

couple of other thoughts ....

I use the same code reader a lot , but i've not worked on petrol 2 ltr engines since the vectra Bs and my Carltons

are there no LTFT and STFT readings in live data of ECU (measuring blocks tab) ?

obviously that would be advantageous ,but I can't remember if it's even an option 

Also ,you say about the EGR , blanking it noticeably would be an MOT fail .
however    before that legislation came in recently  I've blanked many EGRs 


 

[Doctor Gollum]

You can idle it through, say when testing the operation of the temp/fans functionality. And, as it failed on emissions, as long as it is insured, it can be legally driven to/from a place of work where MoT failure related items can be attended to...

... Such as an emissions test

[Raeturbo]

Could be throttle position sensor?

[addy]

Hi dave the builder. The only ones that sound something like LTFT and STFT readings are O2-Loop BLM Idle (Block Learn Map) and O2-Loop BLM Partial Load (Block Learn Map). They are in the live data, I posted links to on first page.

Raeturbo. The TBS is showing .53v, then every now and then .55 without me touching the throttle. Is this right or should it be showing 0v, if I am not using the throttle?

Thanks for everyones help and advice. It is much appreciated. I understand that all advice, might not fix the problem, but if I do one at a time, hopefully it will sort the problem.

[GastronomicKleptomaniac]

I'm desperate to find the solution to this... I've already said that the laptop and readings side of things is completely alien to me... if we identify something I can bash with a hammer that will help, then I'll be straight over

[addy]

GastronomicKleptomaniac that sounds like a good plan.

[Raeturbo]

https://youtu.be/9IUtl6J5F5s
 
   This is pretty good. ^^

[addy]

Thanks Raeturbo, just watched it.  I don't know what the TPS voltage on mine should be at idle(rest). It shows as .53v at idle and does move when throttle is moved. Would anyone have the voltages at idle and WOT, so I can compare them to mine?

If the voltage is too high, before the throttle is touched, then am I thinking right that the ECU, would be thinking the throttle is already being moved. And possibly put more fuel than is needed, but all the other sensors are possibly working correct, so the ECU is confused causing O2 sensor, to do what it wants?

[Raeturbo]

Not sure but I think most work on voltage the same as on the link. BTW, make sure the vacuum feed to the fuel pressure regulator is connected and not leaking.

[Raeturbo]

What voltage should a throttle position sensor?
Although many throttle position sensor voltages are manufacturer-specific, many are non-adjustable and the voltage is in the region of 0.5 to 1.0 volts at idle, rising to 4.0 volts (or more) with a fully opened throttle. For the full operational range, a time scale around 2 seconds is used.

[Steveh]

Hi my 2.0l 16v has always struggled to pass emissions last MOT same again until the MOT tester put the engine type into his computer then it passed X20XEV