Question-------------------------
Followup To
Question -
Hi James,
I'm having a problem with a 2000 V40. It will be running great then all of the sudden, when you let your foot off the gas, the following things happen: 1) Idle surging 2) temp gauge drops to cold when I know the engine is hot 3)hard to restart if I shut it off 4)Strong gas order when trying to restart 5)will only restart after extended cranking and giving it gas.
I have cleaned the IAC Valve and that didn't help. I noticed that it was low on coolant and after topping it off it seem to help for a few days. If the ECT is the cause then why would the temp gauge drop off to cold when it idle surges, it doesn't control the gauge on this model does it?
Where do I start to look? Is it the ECT and if so where is it on this car and how can I test it? It's hard to find any info on this model-i.e can't find a manual
Thanks in advance for your help!
Answer -
The temp guage isn't reading bad because of the idle. Actually its just the reverse. When the computer sees a cold engine it adjusts fuel trim for a cold engine which would cause a strange running engine if it is already idling. If I remember correctly the ECT is right near the thermostat housing. I'll look again tomorrow. If its somewhere else I'll get back to you otherwise you're set to go. Hope that helps.
James
This car has a ECT which I think is on the intake manifold and an engine coolant temp gauge sensor(sending unit for the gauge) which is on the thermostat housing or am I wrong and the one on the T-stat housing is both? Part of my problem is that I am shooting blind because I can't find a manual for this model, do you have any idea where I can fid the manual for this because I would like to test the ECT but don't know what the resistance values should be.
Thank you for your much needed help!!!
AnswerThere were no resistance values for the ECT only voltage specs. So, with the ECT still connected back probe the wires in the connector. (take sewing pins and push into the connector next to the wire until it touches the back of the terminal in the connector). One wire will be attached to ground so it will be 0 volts all the time. The other is the signal wire. It will be around 2.6 volts at 25 degrees celsius (room temp), and .6 volts at 100 degrees celsius (operationg temp. Hope that helps.
James
