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RWD - drive line hesitation

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drive line hesitation 900

Dear j.pelchat,

Hope you're well. Yes!! An engine temperture sensor (Volvo#: 1346030; Bosch#: 0 280 130 032) - mounted in the block, sends a signal to the Engine Control Module. If this sensor's signal fails, the fuel/air mixture is other than optimal. This sensor's failure usually degrades fuel mileage. An over-rich mixture can cause carbon deposits on the spark plugs. That could produce rught running all the time, i.e., not intermittently.

Another possibility is that the ignition control module - mounted on the inner fender wall (driver's side, North American models) to the rear of the headlight - has failed. This sensor is heat-sensitive. When its signal is lost or becomes erratic, the engine will not run smoothly. I think this is the most likely culprit.

A third possibility is that the fuel injection relay (radio interference suppression relay) - mounted on the inner fender wall (passenger's side North American models) to the rear of the headlight - has failed. The engine should run rough as injectors sometimes don't get the power they need. This relay's intermittency could vary according to ambient temperature.

Hope this helps.

Yours faithfully,

Spook






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New drive line hesitation [900]
posted by  j.pelchat  on Thu Jun 21 19:57 CST 2018 >

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