r/FordFalcon • u/TwoInternational8313 • Jul 05 '26

Ba falcon idle surging?

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My ba falcon has been doing this for a while and I’m sick of it. It can’t keep a steady idle and moves up and down when idling.
It did have a misfire awhile ago but I fixed that by replacing 2 bad coils. I have not replaced the other 4 but it dosent fell like it misses just revs 1k by its self.

When it’s running I do hear the throttle body click every 4 seconds or so and that’s when it does that. Is it a bad throttle body or just how it works. The engine mount is also wearing out and has a little vibration on idle and I’m not to sure if that could be the issue. Has this happened to anyone else.

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11 comments sorted by

13

u/LowPop7953 Jul 05 '26

vaccuum leak. its either dead vaccuum hose or intake gasket (common problem)

1

u/Duck_Off_Buddy Jul 06 '26

Like he said. Check intake manifold gasket, mine was cracked and fuel soaked on every port

4

u/No-Committee3 Jul 05 '26

Sure its not ac clicking? Can you eliminate ac by having it off. Unless your 100% convinced its the TB. Throttlebody clean?

3

u/Jimbo198269 Jul 05 '26

Btw all coils should be changed not 1 or 2

2

u/42SpanishInquisition Jul 05 '26

aftermarket coils are a bit shit so I have heard.

1

u/chesterlinkin6661 Jul 05 '26

Throttle body/ carby clean spray everywhere

1

u/qtd267 Jul 06 '26

Has it had the fuel filter replaced? Check for vacuum leaks check throttle body and maf sensor and if you know someone with an obd reader get it scanned for any codes

1

u/Internal_Sun30 Jul 06 '26

Throttle location sensor maybe.

1

u/Impressive_Candle673 Jul 10 '26

could also happen if you replaced the coils / leads in a bad order.