Strange idle connected exhaust vibration

[220bhp]

Did you crimp new pins on as well or just the connector shell?

Can you do the resistance test again between pins 30 and 45 of the ECU connector up to the sensor just to be sure we have a circuit now?

I used the old wireing and connector pins and a completly new connector.pink centre and surround.The old pins seemed ok.
I will check the connectivity to day,when it stops raining,it always rains on my birthday, do not ask how old.Hope its not raining were you are

[220bhp]

Well I finally got a chance to test the wireing again between the new temperature sensor and the ecu connector.I
have continuity on both wires from the connector to pins 30 and 45.
What I do not have is any reading between pin 30 and pin 45 on the ecu connector.
The multimeter does not register anything between these pins with the connector replaced on the sensor,with ignition on or of. Not on the continuity setting, or set at ohms. so I am ether doing it wrong ,or I have a problem.

[twoqu]

I doubt you will get continuity if using a buzzer as they usually only work below a certain threshold say 100 Ohms!
Depending on your MM you might need to set the scale to the correct range. Although if it is autoranging I would have thought it should have been clever enough to set its self! Anyway, it needs to be able to measure above 2000 ohms (2K) to read the resistance of the coolant sensor at temperature up to 20C.

Haven't given up yet! What happens if you disconnect the MAF? Don't drive it, just interested to see if the idle behaves.

[newsh]

Lou, get someone to hold the meter on the pins and then go and wiggle the wiring at the sensor and see if there's any movement at the meter.

Also you might still have corrosion on the mating surface of the female pins in the sensor plug. I would take out the pins and run a bit of fine wet and dry paper through them with some switch cleaner or WD40 on them, then pop them back in the connector and try again.

[220bhp]

Robin if I dissconnect the maf when the car is running,it runs lumpy,revs jump a little from 1000 to 1200.
John I got my son to hold the MM set 2k ohms and hold the two probes on pin 30 and 45,
while I wiggled the wires at the sensor,but there was nothing.

[twoqu]

Try again this time setting the MM to 20K ohms. I don't think it will pick it up at that 2K range. The display will merely show a reading of 2.8 which is 2.8K ohms rather than 2800 ohms. With K =1000. Hope that makes sense!

[220bhp]

Changed the connector again today,new crimps and all cleaned up.set the mm to its lowest ohms setting,and checked the ECU connector pins 30 and 45,still nothing.
I wonder if someone can check there, so I know what I should be getting.

[twoqu]

Lou!
I think you are still getting confused about the MM settings! If you are using the lowest range you will not get a reading!
If your MM has a rotary dial the range usually goes something like this:
200 ohms
2K ohms
20K ohms
200K ohms
2M ohms
20M ohms
Therefore you cannot read the resistance of something of 2800 ohms on either of the lowest settings of 200 or 2K ohms.
You will need to use the 20K ohms which will allow readings of up to 20,000 ohms. The reading of 2800 ohms will be displayed as 2.80 rather than 2800 because we are using a larger scale.
If that has not clarified the situation, tell us what the scales are on the MM so we can advise on which one to use.

[twoqu]

Well I have 2.95K ohms (2950 ohms) between pin 30 and 45! As the temp is below 20C then the reading is higher than the 2.80K ohms (2800 ohms) that the sensor is rated at 20C. So that makes sense.

[220bhp]

Robin,the first setting on my MM 200, then 2k, 20k, 200k,then 2m, 20m.

[twoqu]

Robin,the first setting on my MM 200, then 2k, 20k, 200k,then 2m, 20m.

Ok! Set it to the 20K range and try again.

[220bhp]

I have just got a reading of !.44, the car may still be a little warm,but at least I have a reading.

[twoqu]

Is that 1.44?
Obviously the reading is going to very depending on the temperature. The hotter the coolant the lower the reading.
Might be better to wait until the engine is cold as the temperature will be easier to assess.

[newsh]

So the question is, now that you have new crimps and you're getting a reading...

If you run the car and let it idle, what happens when you disconnect the sensor? (before you said it had no effect plugged in or not)

[220bhp]

I will give it a try