3.9l stalling please help
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Came outside this morning no crank no start so crankshaft will be changed today
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Just came back from replacing the Crankshaft position sensor and i noticed something very strange while i was replacing it.
there is a black wire hanging off a screw leg under the hood on the passenger side closest to the windshield there is no nut on the screw leg to hold this wire in place
also this same wire slips and runs down right above the top bolt of the crankshaft sensor. I thought the wire was grounded to the sensor but there is no way as the screw wouldnt fit in the hole of the wire.
i traced wires back and all are going back to the negative side of the🔋 so im assuming these are loose ground wires
but were does the one by the crankshaft sensor connect to or can i just tap it to the body?
there is a black wire hanging off a screw leg under the hood on the passenger side closest to the windshield there is no nut on the screw leg to hold this wire in place
also this same wire slips and runs down right above the top bolt of the crankshaft sensor. I thought the wire was grounded to the sensor but there is no way as the screw wouldnt fit in the hole of the wire.
i traced wires back and all are going back to the negative side of the🔋 so im assuming these are loose ground wires
but were does the one by the crankshaft sensor connect to or can i just tap it to the body?
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Joined: Oct 2018
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From: Midwest
Sensors aren't grounded to the body, they go back to the ECM as the ECM has to take careful measurements. The ECM will send 5V out the power line and measure the voltage coming back to determine what the sensor is seeing.
That being said, you can get funny problems with loose grounds, so if you found a missing bolt I'd find a bolt that fits and bolt that sucker down. Since the engine was replaced, this is likely something that was bolted down, but was missed when the engine was put back together.
That being said, you can get funny problems with loose grounds, so if you found a missing bolt I'd find a bolt that fits and bolt that sucker down. Since the engine was replaced, this is likely something that was bolted down, but was missed when the engine was put back together.
Thread Starter
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Registered User
Joined: Apr 2021
Posts: 19
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Sensors aren't grounded to the body, they go back to the ECM as the ECM has to take careful measurements. The ECM will send 5V out the power line and measure the voltage coming back to determine what the sensor is seeing.
That being said, you can get funny problems with loose grounds, so if you found a missing bolt I'd find a bolt that fits and bolt that sucker down. Since the engine was replaced, this is likely something that was bolted down, but was missed when the engine was put back together.
That being said, you can get funny problems with loose grounds, so if you found a missing bolt I'd find a bolt that fits and bolt that sucker down. Since the engine was replaced, this is likely something that was bolted down, but was missed when the engine was put back together.
and slips down above top bolt by crankshaft position sensor
its just hanging there where does it go?
