95 850 Rough idle, needs gas

Post by **abscate** » 13 Feb 2020, 19:21

You have to read the chart I linked to very carefully. Too carefully , actually

The columns are shifted so that the wrong numbers are aligned with the temperatures.

Awful.

I have to put a note on this in there

4K ohm at 10 C is close to spec

ebbie · Post by **ebbie** » 14 Feb 2020, 04:37

So the ECT sensor should be working fine then?

Post by **abscate** » 14 Feb 2020, 07:29

ebbie wrote: 14 Feb 2020, 04:37 So the ECT sensor should be working fine then?

Well , it has to work over the whole range, not just at a single point. The engine almost doubles the fuel injected at cold start, so if the resistance isnt right, it won't run.

ebbie · Post by **ebbie** » 14 Feb 2020, 07:45

Hmm ok.. Would the best way of checking it be through taking it out and boiling it in water to see the temp and resistance? Or would it be enough to drive the car around for some time and checking the resistance then?

Post by **RickHaleParker** » 14 Feb 2020, 07:50

ebbie wrote: 13 Feb 2020, 16:00 If so, it was 4.38 so 4380 ohms when I checked.

Measured when it is not connected to the sensor or when it is plugged into the sensor?

Post by **erikv11** » 14 Feb 2020, 07:58

ebbie wrote: 14 Feb 2020, 07:45 Hmm ok.. Would the best way of checking it be through taking it out and boiling it in water to see the temp and resistance? ...

Absolutely. Boil water, put the sensor in and check it, then turn off the heat and check the resistance at several points as it cools.

Post by **RickHaleParker** » 14 Feb 2020, 08:09

erikv11 wrote: 14 Feb 2020, 07:58 Absolutely. Boil water, put the sensor in and check it, then turn off the heat and check the resistance at several points as it cools.

H2O melts at 0 °C (32 °F) therefore the drip off an Ice cube is 0 °C (32 °F).

ebbie · Post by **ebbie** » 14 Feb 2020, 09:22

Alright then I will see if I can do that this weekend. Thanks for the guidance!

Post by **erikv11** » 15 Feb 2020, 12:55

RickHaleParker wrote: 14 Feb 2020, 08:09
erikv11 wrote: 14 Feb 2020, 07:58 Absolutely. Boil water, put the sensor in and check it, then turn off the heat and check the resistance at several points as it cools.
H2O melts at 0 °C (32 °F) therefore the drip off an Ice cube is 0 °C (32 °F).

Hi Rick, I find your statement of fact irrelevant. There is no doubt some clever intent behind your crypticness, please elaborate!

ebbie · Post by **ebbie** » 16 Feb 2020, 11:05

Actually, I solved the problem! My mom started googling about my issue and came upon a post about the idle air control valve, where it had gotten stuck. I never really stopped thinking about the IAC, and so I checked on YouTube some people saying the IAC should make a little rattling sound if you shake it. I didn't remember it making any sound when I cleaned it a few days ago, so I went back to the IAC and decided to give it a couple of gentle hits to the valve, and tried to open it manually. Sure enough it opened up now! So I cleaned it again even more and then put some oil too to make it smooth, and ran the valve back and forth a couple of times. Car started perfectly!

I feel stupid for not having checked if the valve opened or not when I cleaned it th first time, I guess I was too nervous about poking around too much.