Dool
Our little car is back up on its feet after replacing No 1 coil, 4 Plugs and the Cat. Costly exercise. But she is still drinking the fuel.
It is a cable accelerator, with a mechanical fuel regulator, and 1, O2 sensor (Before the cat)
How do I test the O2 Sensor? and other sensors that may cause this? And the regulator? I have a basic tool set, no fancy pressure gauges or anything, and a basic Multi-meter.
Cheers for any help, as I would just like to replace the faulting part, I am over chasing the rabbit.
Ex850R
Do you get any codes up? Light?
Dool
No warning lights, clear ecu. Mind you I started the car and disconnected the ho2 sensors and no warning lights, so I have some electrical contact cleaning, so I will clean the plug. But yeah, no warning lights, idles fine, run greats..........
Dool
@Ex850R I just check the O2 sensor with my digital multi-meter. The heater part seems to be functioning correctly, as it didn't take long to warm up. I done an in car test, once she got up to running temp. I used the probs of my multi-meter and read the wires as she was idleing, Jumping between .70v down to .09v she didn't sit at any voltage. She just kept going up and then going down. When I rev the engine to about 2000rpm it kinda sat up at .70v and when I let her idle back down she dropped to .02-.01v for about 2-3 seconds, then continued on its bouncing around between .70v and .09v with no set range. So would I be right that the HO2 sensor is crapped out?
nickm
That sounds right as it is switching correctly, generally the ECU is sensitive to 02 issues and will trip a code.
Does it start first crank?
Dool
@nickm
Yes, it starts first time every time, apart from the excessive fuel consumption, you wouldn't think anything was wrong.........
I have been pulling my hair out over the EGR valve. There is a big black hose that runs from the EGR valve to a black plastic thing, with a little hose that runs off the top of that to the MAP? (A little part that has hoses coming off it and GM mark on it) and the black pipe keeps running from that to the air box. There is a spark plug in that hose from the EGR to the little black box that has that little hose running off it. I have tried to google this, but it must be a secret..... As I can not find any exploed diagrams of this part. So if the EGR is semi connected, this will cause fuel consuption? ANd can anyone give me a link to a exploed view?? My engine is a B4204s non-turbo --- no GDI.
Dool
@nickm @Ex850R
Ok, the little black box I am talking about is OEM Part number 9146656. What a mission that was......
If anyone is interested the OEM part number for EGR valve is 9445202.
Dool
http://www.volvo40forum.nl/forum/viewtopic.php?f=37&t=5915&hilit=luchtpomp
Scroll down and you will read in English what VADIS has to say about that system.
I am actually interested in this part..
When the pump is operating, the signal from the heated oxygen sensor (HO2S) is not used..
This could explain why my HO2 sensor is not flagging when I disconnect it when the car is running................
It thinks that the
secondary air injection system is still running.....
Will find the fuse for the bloody thing tomorrow and see if that makes a difference.
nickm
I'm not overly familiar with the NA ECU ? Have you checked out Vol-Fcr and a compatible cable (ebay $20) so you can check historic faults?
The O2 sensor if disconnected will send the ECU into open circuit and run mighty rich.
Dool
@nickm
So, I have taken the plug out of the SARS, left ho2 sensor disconnected, waited while the car warmed up. And bingo, flagged the disconnected ho2 sensor :) I am happy, because it shows the system is working correctly. So I am currently sitting in my drive way (and it freezing) with the multi meter connected to the coolant temp sensor. As I have also noticed that the thermo fan does not engage, the dash temp reads half, and she makes a tapping sounds after been run for more then 40 mins.
I understand that resistance goes up the colder it gets, and goes down the warm she gets.
On a nearly cold motor I am sitting at 1.64 ohms (20k setting). I am kinda think that the ect sensor is faulty, and not bad enough to flag a lambda light at me.
