Emissions failing - The latest test readings - Nightmare car

[qwakers]

im watching this thread with interest. the ecu side of cars has always interested me

[SonicSW20]

E1 - OX1, not in diag mode (don't think it matters) - https://www.youtube.com/watch?v=A-VBpBqPFiE

E1 - VF1 in diag mode - https://www.youtube.com/watch?v=TsqcKiNnqIw

Ef - VF1, not in diag mode - https://www.youtube.com/watch?v=lwXTR1qMoEg

Hey Tottacorola - In your video of EF - VF1 not in diag mode, your reading is 2.5v. Can you confirm that is with the engine just ticking over? If so, when you rev and hold the engine at 2500rpm does the voltage then go up to 5v?

It was at idle, and it should stay fixed as it's the fuel trim I think. I'll try and do that as a demo at some point this week for you.

[Mr2Owner]

E1 - OX1, not in diag mode (don't think it matters) - https://www.youtube.com/watch?v=A-VBpBqPFiE

E1 - VF1 in diag mode - https://www.youtube.com/watch?v=TsqcKiNnqIw

Ef - VF1, not in diag mode - https://www.youtube.com/watch?v=lwXTR1qMoEg

Hey Tottacorola - In your video of EF - VF1 not in diag mode, your reading is 2.5v. Can you confirm that is with the engine just ticking over? If so, when you rev and hold the engine at 2500rpm does the voltage then go up to 5v?

It was at idle, and it should stay fixed as it's the fuel trim I think. I'll try and do that as a demo at some point this week for you.

That would be very helpful so I can compare. Cheers

[thomp1983]

Your problem lies in one of three areas you need to do some testing to identify which.

It's either, the o2 sensor is faulty, remove it from the car put it in a vice, set up your multimeter on the signal ground and signal wires (or the one wire and sensor body if a single wire sensor) get a blow torch gently warm up the end of the sensor, when warm blow out the torch but turn the gas up if you hold the gas flow over the sensor you should get a brief reading on the meter. Cycle holding the gas on and off the sensor a couple of times to confirm it consistently picks up the change. If you get no reading change your sensor is faulty

Once you confirm the sensor is ok you need to confirm the wiring on the car, heater circuit turn ignition on use meter to check for voltage between heater positive and negative wires, signal earth you will need to check a wiring diagram where it earth's (normally to e1) trace that earth to where it's bolted to chassis and confirm continuity between the sensor earth pin and the point it bolts to chassis. Signal wire find the pin it goes to at the ecu and do a continuity test between that pin at the ecu and the signal pin at the o2 connector block.

If all the above wiring checks prove ok then something is causing the car to run rich but I'd confirm the above two parts first

[Mr2Owner]

E1 - OX1, not in diag mode (don't think it matters) - https://www.youtube.com/watch?v=A-VBpBqPFiE

E1 - VF1 in diag mode - https://www.youtube.com/watch?v=TsqcKiNnqIw

Ef - VF1, not in diag mode - https://www.youtube.com/watch?v=lwXTR1qMoEg

Hey Tottacorola - In your video of EF - VF1 not in diag mode, your reading is 2.5v. Can you confirm that is with the engine just ticking over? If so, when you rev and hold the engine at 2500rpm does the voltage then go up to 5v?

It was at idle, and it should stay fixed as it's the fuel trim I think. I'll try and do that as a demo at some point this week for you.

Hey dude, I know its coming into Winter and a bit cold to be out rooting at your car, but if you get a spare moment maybe you'd check that last test for me. Even if you don't get time to make a video, just the test result will do me. The test result being with regards to with EF - VF1 not in diag mode, what does the voltage read when the engine is revved to 2500rpm?

Your other tests have proved very helpful.

Cheers!

[Mr2Owner]

@Gazza_DJ - Maybe tomorrow being Sunday you might get a few mins to check that final reading

[SonicSW20]

Car is currently on the drive with no alternator or bracket fitted, with no alternator or bracket to go on it at the moment

[Mr2Owner]

Car is currently on the drive with no alternator or bracket fitted, with no alternator or bracket to go on it at the moment

Ah, no! Hope you get her sorted soon! Thanks for reminding me though, my alternator belt needs changing as its about to break, there's not much time to rest with these old classics.