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1997 XH Falcon revving and idling issue 

 

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 Post subject: 1997 XH Falcon revving and idling issue
Posted: Sat May 28, 2016 8:48 pm 
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Ride: Ford Falcon XH Ute 1997

Location: Mildura
NSW, Australia

I recently revived an xh falcon Longreach with a transmission switch and new fuel pump and have just noticed some issues with it revving unnecessarily. It's hunting through the rev range, sometimes it's revs 2000rpm at idle for a minute or so then drops down or goes back up again. Any information or advice would be appreciated as to how to resolve this issue.
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 Post subject: Re: 1997 XH Falcon revving and idling issue
Posted: Mon May 30, 2016 7:45 pm 
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Check the idler screw on the TB, adjust and see if it resolves the issue.

ISC could also be gunked up, its located on the TB as well.

Does it surge without touching the accelerator or does it rev hang after touching the accelerator?

You swapped a manual with a manual right, not auto to manual conversion.

 

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 Post subject: Re: 1997 XH Falcon revving and idling issue
Posted: Mon May 30, 2016 8:41 pm 
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Ride: Ford Falcon XH Ute 1997

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Manual to manual. Throttle bodys good, it does seem to 'rev hang' after touching the accelerator.
TB=Throttle Body?
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 Post subject: Re: 1997 XH Falcon revving and idling issue
Posted: Mon May 30, 2016 8:47 pm 
Getting Side Ways
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Jacob-1919 wrote:
Manual to manual. Throttle bodys good, it does seem to 'rev hang' after touching the accelerator.
TB=Throttle Body?



yep
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 Post subject: Re: 1997 XH Falcon revving and idling issue
Posted: Mon May 30, 2016 8:50 pm 
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Jacob-1919 wrote:
Manual to manual. Throttle bodys good, it does seem to 'rev hang' after touching the accelerator.
TB=Throttle Body?


1) Check to see that the accelertor cable isn't binding.

2) Clean the ISC.

3) Reset the base idle.
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 Post subject: Re: 1997 XH Falcon revving and idling issue
Posted: Mon May 30, 2016 9:57 pm 
Stock as a Rock
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Jacob-1919 wrote:
Manual to manual. Throttle bodys good, it does seem to 'rev hang' after touching the accelerator.TB=Throttle Body?


Hmm, could be a possible host of vacuum leaks.

 

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 Post subject: Re: 1997 XH Falcon revving and idling issue
Posted: Mon May 30, 2016 10:05 pm 
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Ride: Ford Falcon XH Ute 1997

Location: Mildura
NSW, Australia

Already reconnected the hoses to actuate the heater valve but that has only partially solved the problem.
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 Post subject: Re: 1997 XH Falcon revving and idling issue
Posted: Mon May 30, 2016 10:14 pm 
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Jacob-1919 wrote:
Already reconnected the hoses to actuate the heater valve but that has only partially solved the problem.


That will only cause a leak when you have your heater on hot, there's no vacuum in that line otherwise but good work.

Checked your brake booster line, PCV lines, canister purge lines, intake manifold gasket.
Check all the things!

If you get some carby cleaner and spray it around suspect areas while engine running you should hear the engine rev up when you hit a leak.

But as SWC has said, probably best to check/clean the ISC and reset base idle first.

 

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