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1996 Thunderbird LX
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618 Posts
Discussion Starter · #1 ·
I figure that I have a vacuum leak somewhere. I somewhat recently did the PI intake swap so I sprayed the passenger side of the intake to see if I saw any bubbles while the engine was idling. I didn't see any. Is there a better way to see a leak without using an expensive smoke machine? Any other places I can check? Could it not be a vacuum leak at all?
 

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97 Thunderbird 4.6, 98 Mark VIII LSC
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11,171 Posts
An exhaust leak (before the upstream O2), dirty injector(s), a dirty MAF, vacuum leaks, a faulty O2 sensor and fuel pressure issues can all cause a lean condition.
 

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707 Posts
If it's only lean on bank 2, start by checking things on that bank. A vacuum leak, MAF & fuel pump are common to both banks and would generally affect both banks equally.
Also, you can use a cigar to smoke test:
 

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1996 Thunderbird LX
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618 Posts
Discussion Starter · #4 ·
The engine tends to slightly stumble at idle but smooths out as soon as I take off. It is inconsistent. Might be the injectors. I have not thought of that. I have some fuel cleaner at home already. I will run it through the tank and see if it clears up.
 
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