VW Golf Mk4 1.4 16V AHW, backfires when cold. There were three broken wires, one goes to the EGR, one to the throttle body and one to the mass air flow. New throttle body, Coil pack and wires tested....
Aparently, a "full diagnostic" has NOT been done. If this statement were true, you would have found the cause of your problem.
With that said, backfiring is usually caused by damaged/leaking exhaust valves. Have you performed a compression test on this engine?
If the computer is "getting the wrong reading of the air/fuel mixture", then you should be getting oxygen sensor and/or fuel trim codes.
The coolant temp sensor does not cause the computer to get the wrong reading of the air/fuel mixture, it causes the computer to get the wrong reading of the engine coolant temperature. Although this will affect how much fuel the computer gives the engine, it does not cause it to get wrong readings of the mixture.
Just so you know, "diagnostics" consist of a WHOLE LOT more than hooking up a code reader and pulling codes from the engine computer.
People think that an automotive repair technician simply plugs in the "magic box" and replaces all the parts the "computer" tells him to replace...I WISH it were that simple!
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