Strange idle connected exhaust vibration

[twoqu]

Oh! The factory spec for the coolant temp sender is so vague as to be useless! Says 1.5-3.0K ohms.
I knew I had seen a chart somewhere!

http://www.sjmautotechnik.com/trouble_shooting/20vcoolt.html

[220bhp]

I have tested the wires from the temperature sensor to the ecu PINss 45 and 30 and they both have continuity There is a 21v feed to one of the wires and a ground to the other.With both connectors dissconnected I checked between the two pins on the sensor connector and there where no ohms.
I cannot egt the sensor to undue. The spanner just slips.So I am going to leave it till I get a new one on monday.Hopfully gsf will have one.
One thing I did notice is that the connector its self is not good,its crumbleing and needs replaceing,the wireing itself seems ok.

[twoqu]

If you quickly wanted an answer you could rig the other sensor in the hot water and hook it up. You will know if its the cause then!
Again according to the info, even if it failed the ecu would assume a certain temperature (80 degrees C) which would be enough to have a lower idle speed. Who knows, its the difference between theory and practice. We can only go on what we have been told unless peoples experiences prove different.

[220bhp]

unfortunattly

Robin. I agree, but unfortunatly the dam thing will not budge. I will have to try the hammer and cold chisel approc,.but I am not going to try it till I get a new replacement.
Thanks for all your efforts we will get there.

[twoqu]

Lou,
I was talking about the spare sensor! Even if you hooked it up without heating it, I would have thought the idle would be less. If you can get it nearer operating temperature than all the better.
So what I was suggesting is either preheat the spare and connect it up or connect it up and try and heat it by submerging it in hot water if you see what I mean. Then start the car and see if there is any difference in the idle speed.
Although rather than phaff about, we could have stuck a 200 ohm resistor in there to simulate a 100 degree C engine had we known!

[newsh]

Can you get the meter probes on the sensor which is stuck in the head and measure the resistance?

Crumbling plug sounds suspicious, I wonder if the sensor pins are corroded. As I said earlier, when I disconnect my sensor the idle speed increases.

As Robin says, you could plug in the spare sensor, dangle it in a cup of hot water and start the car, then you could wiggle the connector around to see if anything changes.

[twoqu]

Or measure at the ecu connector between pin 30 and 45 with it connected, thats what the ecu sees.

[newsh]

Or measure at the ecu connector between pin 30 and 45 with it connected, thats what the ecu sees.

[220bhp]

Or measure at the ecu connector between pin 30 and 45 with it connected, thats what the ecu sees.

If you mean is there continuity between pnis 30 and 45 on the ecu connector with the sensor pluged in .No there is not

[newsh]

If you mean is there continuity between pnis 30 and 45 on the ecu connector with the sensor pluged in .No there is not

Have you tried it on resistance measurement?

It shouldn't be continuity (zero Ohms), it should measure the same as the spare sensor, between a few hundred and 2000 ohms depending on how warm the car is.

See if you can get a wee mirror in there and look at the pins in the sensor, they should be clean and bright! If not try a toothbrush and some switch cleaner or wd40.

If you can't get a resistance reading through the sensor from the ECU connector that is definitely wrong! Either the sensor connector is bad or the sensor itself is broken.

[220bhp]

I defo cannot get a reading between those to pins.The connector is on,and the ignition.
The multimeter is turned to continuity,and nothing.I also tried the spare plugged into the connector, and its the same.
I will buy a new one tomorrow,and the battle will continue.
Going away to have a good swear and cuss now

[newsh]

I just said, it shouldn't be continuity. The multimeter should be on resistance on the 2000 Ohms (2k) range. If you can't get a reading with the spare sensor either then it has to be the sensor connector!

[twoqu]

Or the ignition! Less chance of shorting anything out. Basically we should have whatever the resitance (ohms) of the temp sensor is at whatever the engine temp is. If its cooled down we should have the 20C ohms reading.

[220bhp]

Sorry I am confused now.DO you mean probe between pin 30 and pin 45,with the MM at the 200k ohms setting and the ignition turned of,then there is nothing.
If there should be a connection of some sort Between PIn 45 and pin 30 on ECU ,it is not there,so is this the reason for my problem do you think

[220bhp]

My wife has just bought me a picture of my car,a lenght of hose pipe and a bottle of whisky. Is there a hidden message here, or is she just being helpful in her own little way.