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Originally Posted by wjdunham
Since it is easy enough to debug the temp sensor, I did that first. It does seem to be a potential culprit.
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Not necessarily. It basically indicates you have a mixture problem when 1st starting.
Quote:
Originally Posted by wjdunham
I disconnect it and leave it dangling, won't hold idle.
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The mixture is now too rich.
Quote:
Originally Posted by wjdunham
Jumper with a 2.7K resistor, engine will hold an idle although not super smooth and a bit low RPM, but at least it stays running. When I pull the jumper it dies.
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The mixture now is close to being correct.
Quote:
Originally Posted by wjdunham
Tried a 270 Ohm resistor and a wire to short it completely, neither will get it to hold an idle.
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It's again too lean a mixture.
Quote:
Originally Posted by wjdunham
Ugh, it's a bit of a pain to replace that sensor so I'd really like to make sure it's the problem. Again, when I measure the resistance across it when it's cold, I get something less than 2K Ohms.
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You need to try a 3-4K resistor. Remember, higher resistance causes richer starting mixture.
Quote:
Originally Posted by wjdunham
I'll take a few measurements when the engine warms up and see if it is showing at least some response to the engine temp. If the mixture is off due to some other cause is it possible I see the above behavior?
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Yes!
You have two DME ECUs, one with a stock chip and the other with a modified chip
and they both cause the engine to run the exactly same, right? If that's true, then it's not an ECU problem.
Again, try and richen the mixture by pushing on the AFM flap and/or remove the cover and mark the flap position and then loosen the flap spring, when first starting the cold engine.