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MPG decrease - Injectors, wiring harness? 700 1986

posted by  kittysgreyvolvo on  Tue Dec 31 19:16 CST 2013
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last visit: Sat Oct 18 15:23 CST 2014
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Uncle 740_dan,

So you did http://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm?

As for fuel smell, inspect the hose between the fuel rail low pressure return to the steel fuel return. If it is stiff without supple, or, more likely, spongy, replace immediately.

Check the wire harness between the engine control system computers (LH-Jetronic for fuel and Bosch EZK for ignition and, if equipped, EGR) at 33 years, connectors can corrode and fail, the wire harness can chafe against body pieces, sensors can fail, and so on. A multimeter with continuity and resistance (ohmmeter), and the usual voltmeter functions helps with wire-harness and connected sensors.

With power off and battery disconnected, you can disconnect, inspect, and reconnect wire harness junctions. Same for connectors at the computers. Moisture intrusion can cause faults with electrical pieces inside the passenger cabin.

I guess that does it.

Hope that helps.

MacDuff.






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New MPG decrease - Injectors, wiring harness? [700][1986]
posted by  740_dan  on Wed Nov 27 13:13 CST 2013 >


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