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What would make a car run rich off boost?

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Old 06-02-2002, 08:20 AM
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What would make a car run rich off boost?
Old 06-02-2002, 09:14 AM
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Bad coolant sensor would be my first place to look.
Old 06-02-2002, 09:42 AM
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Default constantly rich, or just rich when you let off the throttle?

If the latter, check for tears on your intake hoses. Are you making full boost?

-T
Old 06-02-2002, 12:21 PM
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Maybe not - I had a bad one but it did not run rich
Old 06-02-2002, 03:05 PM
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I am making full boost only rich when off the throttle. what about vacum hoses?
Old 06-02-2002, 03:06 PM
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Default could be..

how are you determining you are running rich?

If I were you, I would inspect as many of the intake hoses as I can to see if there are any tears or loose hoses..

-T
Old 06-02-2002, 03:30 PM
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Default I am getting DTC 17547, 17545 but they only come when car is off boost

or if someone stalls it( my wife once and detail guy second time) the codes will be thrown. If I cruise at a constant speed for a couple of blocks at a very low rpm 1700 or less then I will get those codes and and CEL will come on. If I drive normally I can go for a week or two with no codes. But once the codes are thrown there is a loss of power.
Old 06-02-2002, 03:37 PM
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Default Odd... I guess it could be a faulty MAF -- reading too high (and hence the ECU giving too much fuel)

But it could very well be a small leak somewhere that only manifests itself when you are only pushing low volumes of air.

Or, I guess, it could be bad O2 sensors? Hmm..

Try cleaning your MAF... takes about 10min to remove and replace it... let it soak for a while in some 90% or more Isopropyl alcohol (you can find this at your local Longs Drugs, generally)

-T
Old 06-02-2002, 03:41 PM
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Ahh O2 sensor. Checked readiness this morning and Cat has failed stock chip has been in for 2 weeks.
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