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Why does my 2002 Ford Falcon idle irregularly and have a delayed throttle response?

Asked by Christie

I have a 2002 AU Ford Falcon station-wagon. When I start it up, it will idle normally. Once it warms up it will idle irregularly. It has a delayed throttle response. I replaced the intake manifold gasket. It did not cure the problem. It feels like it runs on three cylinders once it warms up. What can it be?

Answered by CarsGuide

6 Apr 2021 David Morley

An engine that runs well when cold but misfires when It’s warmed up is often a victim of poor air-fuel mixture. That can be caused by an air-leak (such as the intake manifold gasket you’ve already changed) a crack in any of the intake plumbing, faulty fuel injectors, a worn fuel pump, a corrupted ECU (computer), blocked fuel line or about a thousand other things.

But in this case, knowing the Ford AU Falcon’s engine, I’d be taking a close look at the ignition system, specifically the coil pack. These have been known to fail regularly, often displaying their problems including a rough idle, once the engine has warmed up; precisely the symptoms you’ve noted. That said, rather than rush out and buy a new coil pack, have the vehicle scanned electronically to rule out any other potential source for the problem.

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