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95 Bronco, 351W, E4OD, 4.56 gears, 35x12.50x15 Patagonia MTs.
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242 Posts
Discussion Starter #21 (Edited)
I wonder if an intermittently clogged cat would mess with my vaccum?

Edit: theory confirmed.
 

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Registered
95 Bronco, 351W, E4OD, 4.56 gears, 35x12.50x15 Patagonia MTs.
Joined
·
242 Posts
Discussion Starter #23
I wonder if that would mess with the HVAC though.
If it makes vacuum drop off easier, it could amplify issues like a small vacuum leak.

Verified everything today, the check valve was intermittently not sealing. Will replace.
 
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