LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Lurking p0507 code please help

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Old 03-30-2014, 12:55 PM
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Default Lurking p0507 code please help

I'm chasing down this trouble code and I can't figure it out. My idle is around 800rpm warm. Only weird thing I've noticed is my rpms bounce 100rpm when I hit a bump but that's it. Car runs great otherwise, I'm really stuck here and in need of some serious help
Old 03-30-2014, 04:01 PM
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Check vacuum hoses.
Old 03-30-2014, 06:22 PM
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Just checked all of them and swapped a couple of vAcuum elbows as well as the pcv hoses. Do you know if the passenger side vent hose is supposed to have vacuum ? Mine doesn't have any, no change in idle when unplugged either.
Also any clue as to what would cause my rpms to bounce on bumpy roads ?
Old 03-30-2014, 06:24 PM
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Also do you have a diagram the vacuum hoses ? Just want to make sure I checked them all
Old 03-30-2014, 09:36 PM
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Originally Posted by BayAreaMuscle
Just checked all of them and swapped a couple of vAcuum elbows as well as the pcv hoses. Do you know if the passenger side vent hose is supposed to have vacuum ? Mine doesn't have any, no change in idle when unplugged either.
Also any clue as to what would cause my rpms to bounce on bumpy roads ?
Which hose do you mean? The one going into the valve cover? There won't be any vacuum from the TB side at idle.
Originally Posted by BayAreaMuscle
Also do you have a diagram the vacuum hoses ? Just want to make sure I checked them all
There should be a vacuum hose diagram on your radiator cover.
Old 03-30-2014, 09:57 PM
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Yea the passenger side valve cover. Ok just making sure
Old 03-31-2014, 08:46 AM
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Have you run the car to see where the iac is at? Or what your map reading is
Old 04-01-2014, 12:04 AM
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No I haven't yet mostly because I'm not really sure what I should be looking for. Any tips on what to look for? Code hasn't popped up again so far but my idle still bounces 25 rpm once in a while
Old 04-01-2014, 06:38 PM
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Iac count should be 54 or so on a cold start it will be higher then come down.
Old 04-01-2014, 09:54 PM
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Ill check that asap. Code came back today, any thoughts on my tps maybe reading the throttls blades position wrong ? Im gonna drop it off at the mechanic this weekend if i cant figure it out.



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