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weak connection with temp sensor II ; lean or rich?

Posted: Thu Nov 03, 2016 7:00 pm
by TrollFromDownBelow
I had a temp sensor II that had worked it's way loose (threads are partially stripped). So late this summer, I reinstalled with just a dab of blue loctite (same as I did before). Me thinks I may not have had it all the way screwed in the last time I did this....seemed I was able to turn it in farther.

My question is, after I did this, it appears to be running leaner. I richened the static setting out two notches (which, interestingly, put it back to the original, presumably stock setting (I bought a rebuilt AFM about 8 years ago) and this seemed to help.

So my question is, if I didn't have a solid ground with the TS II would it make it think it was running rich, or lean?

Re: weak connection with temp sensor II ; lean or rich?

Posted: Thu Nov 03, 2016 9:52 pm
by airkooledchris
not based on any known facts, but I thought id heard or read that it defaults fairly rich without a TSII signal.....

Re: weak connection with temp sensor II ; lean or rich?

Posted: Fri Nov 04, 2016 7:07 am
by Bleyseng
Rich....as the engine warms up the ECU leans out the AFR. You need a richer mix when the engine is starting and cold to run.

Re: weak connection with temp sensor II ; lean or rich?

Posted: Fri Nov 04, 2016 10:24 am
by asiab3
Yes to the above answers. Careful with the thread locker, if the application of it is comprehensive enough, the ground path for the sensor might be compromised, resulting in a rich condition. Testing it with an ohmmeter would give answers.

Robbie