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87 244 rough running at start 200 1987

Okay so I'm here with an update,I had some domestic obligations yesterday and couldn't work on the car.

Today I jumped the fuel pump at the fuse box, as some of you suggested, and started the engine. It's actually worse than before, it wouldn't turn fast enough to even put out the alternator light. After a minute it stalled. I tried it a second time and had the same result.

Since it doesn't seem like a problem with the fuel system I'm beginning to think the idea of a cold start circuit problem is making sense. I wanted to check the temp sensor and according to Bentley terminal #2 on the ECU plug should read resistance to ground according to a chart. My garage was 55 degrees F and according to the chart the reading should have been around 3000 Ohm. What I got instead was open circuit.

I haven't been able to come up with a pin-out for that ECU plug but I did find a diagram that I must have found on the internet years ago. according to that chart #1 is the wire on the opposite end from the cable and the row with thirteen wires. If this is correct then it looks like I have an open circuit from the temp sensor.

Using that same #2 wire I ran a jumper from there to the engine and checked for continuity between there and the temp sensor plug. There are two wires in that plug and they both are open circuit to the #2 wire on the ECU plug.

The sensor is under the intake manifold and is pretty tough to probe but I think it checks OK, I will replace it anyway but I need to sort out the wire problem first.







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