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edv8wagon
Fordmods Parts Gopher
Posts: 53
Joined: 13 Nov 2004
Location: Sydney NSW, Australia
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 Posted: Tue Jan 04, 2005 11:27 am Post subject: XH low on power |
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| On a recent run down the coast I noticed that when I put load on the motor I lose all of my vacuum, so much so that my ventilation controls go to the default no-vacuum setting (Windscreen, heater on) Initially I suspected a leak, but this is not the case because at idle I have 20Hg rock solid. Open the throttle body and apply load and it will go to nothing. I suspected I was not getting enough fuel so I replaced the fuel filter wich was almost totally blocked. I then cleaned the injectors and fuel rail with metho, a syringe and 12Vdc. This gave a slight improvement. I have noticed that the timing does not advance very far when I give the throttle a blip in park, about 15-205 deg. My V8 ED advances significantly more than this. How far should it advance in normal mode in park? any ideas? |
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4.9 EF Futura
Moderator
Age:27
Posts: 8658
Joined: 05 Nov 2004
Location: Adelaide CBD SA, Australia
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| Posted: Tue Jan 04, 2005 11:38 am Post subject: |
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Doesnt really sound like a vac problem does it? I mean, the manifold will reach atmospheric pressure if the TB is wide open - but doubt the vent controls should be defaulting to windscreen.
Any EEC diagnostic information to be had? |
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edv8wagon
Fordmods Parts Gopher
Posts: 53
Joined: 13 Nov 2004
Location: Sydney NSW, Australia
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| Posted: Tue Jan 04, 2005 11:54 am Post subject: |
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The ECU gives 1 1 1, but I replaced it with a spare anyway. No change. I replaced the TFI module, No change. New leads, cap, button and plugs, No change. I blocked all vacuum connectors on the manifold, no change.
As a test I reversed the connections for fuel supply and return, the fuel pump sounded very laboured and stopped early, suggesting it is pumping at capacity. I would like to know if the timing is advancing enough. |
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fairmont1998
Fordmods - Getting Side Ways
Age:34
Posts: 695
Joined: 05 Nov 2004
Location: Adelaide. SA, Australia
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| Posted: Tue Jan 04, 2005 8:49 pm Post subject: |
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| Have you checked if the base timing is correct? |
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neil101
Fordmods - Smokin em up
Age:27
Posts: 241
Joined: 11 Dec 2004
Location: kellyville NSW, Australia
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| Posted: Tue Jan 04, 2005 9:14 pm Post subject: |
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| Has your vacum tank got a crack in it? that would cause vacum lose at full throttle or even the one way valve maybe faulty. |
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edv8wagon
Fordmods Parts Gopher
Posts: 53
Joined: 13 Nov 2004
Location: Sydney NSW, Australia
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| Posted: Wed Jan 05, 2005 7:17 am Post subject: |
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| Base timing is correct and I have plugged all vacuum outlets on the manifold except brake booster and MAP sensor. |
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