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Using a fog machine to diagnose p1171/74 combo?

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Old 08-05-2015, 11:56 PM
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Default Using a fog machine to diagnose p1171/74 combo?
Would a fog machine be safe for sensors and such? Or would it do more bad than good?
 
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Old 08-06-2015, 08:20 AM
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First what year is it, how many miles on it and what other codes are showing ?
If you had a major vacuum leak, yes it will find the leak.
 
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Old 08-06-2015, 08:15 PM
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Originally Posted by Disco Mike
First what year is it, how many miles on it and what other codes are showing ?
If you had a major vacuum leak, yes it will find the leak.
2003, about 116k, engine has about 60k p1171 p1174 are the only codes and it won't pass emissions so I need to get it fixed
 
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Old 08-07-2015, 02:34 PM
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Start by looking to make sure you have no vacuum leak at the manifold and the header connections.
 
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Old 08-07-2015, 04:43 PM
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If you don't find a vacuum leak anywhere, do your fuel injector seals. That solved mine and several other board members and most likely is your issue unless you find a vacuum leak in the intake hoses.
 
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Old 08-08-2015, 11:48 AM
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Originally Posted by Andy2Rover
If you don't find a vacuum leak anywhere, do your fuel injector seals. That solved mine and several other board members and most likely is your issue unless you find a vacuum leak in the intake hoses.
If it is the fuel injectors, how do I check to see if they are leaking?
 
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Old 08-09-2015, 08:07 AM
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I didn't do a test. It was a safe bet after I eliminated all the other usual suspects.
 
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