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Old 09-08-2014, 09:25 AM   #1
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anyone with boss 302 IM

so i installed my intake manifold yesterday and the install was fairly easy that being said i happen to come across a problem. when im idle say at a light, i happen to see my RPM go below 500 and then i hear my engine fight it and it shoots back up to about 700. my rpm have alwasy moved around but ive never seen it go that low or react in that way. does anyone else have this problem? or is it normal with this IM?
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Old 09-08-2014, 12:43 PM   #2
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Nope.... Vacuum leak maybe. Do you have a tune for the Boss IM?


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Old 09-08-2014, 01:35 PM   #3
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yes i do. bama.

it doesnt happen onstantly though it happens maybe once a minute or so
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Old 09-08-2014, 01:38 PM   #4
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There is a air leak somewhere. Either one of the gaskets fell out of place slightly, or is not tightened properly.
Or you pcv hoses are not hooked up properly. Could be a # of things.

Or simply could be your canned tune.

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Old 09-08-2014, 01:41 PM   #5
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Quote:
Originally Posted by Rapinator126 View Post
There is a air leak somewhere. Either one of the gaskets fell out of place slightly, or is not tightened properly.
Or you pcv hoses are not hooked up properly. Could be a # of things.

Or simply could be your canned tune.

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ill recheck the torque later see if thats it.
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Old 09-08-2014, 01:50 PM   #6
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You positive all the gaskets were in ther? And straight not tore etc?

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Old 09-08-2014, 09:02 PM   #7
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yes they all looked perfect when i saw them and i torqued to spec.
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Old 09-08-2014, 09:09 PM   #8
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Cannot intake manifold leaks be troubled shoot by using an un-lit propane torch? I did check a motor once that way, lightly putting the propane for a sec or too across the intake gasket area looking for a change in idle means a leak.

Same with hoses, a leak will pull in the propane and idle will change.
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Old 09-08-2014, 09:15 PM   #9
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i wouldn't dare to shoot a torch into a an intake manifold. I'm going to remove it tomorrow and double check everything if something is wrong i will reapply the factory manifold.
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Old 09-08-2014, 09:47 PM   #10
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Quote:
Originally Posted by Joaquin_ii View Post
i wouldn't dare to shoot a torch into a an intake manifold. I'm going to remove it tomorrow and double check everything if something is wrong i will reapply the factory manifold.
No, you don't shoot a lit or unlit torch into the intake manifold You take an unlit torch with propane output on low and run the gas slowly by items that can suck air; hose connections, areas where the manifold seals to the heads etc. If air is being sucked in, it also brings in some propane and changes idle. DO some searches on the techniques used to find vacuum leaks by shops.

On the other hand, nothing wrong with taking the manifold off and double checking everything either.
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Old 09-09-2014, 01:35 AM   #11
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You can use carb cleaner to trace vacuum leaks also. Engine will rev when you hit the source of the leak. Are you sure the MAF sensor is plugged in? Had an engine act similar with the MAF unplugged.

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Old 09-09-2014, 03:42 PM   #12
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it was due to a bolt not tighten down all the way. everything else was good as far as gaskets and MAF. however i over torqued a bolt so now i have to drill it out somewhere thank you for helping out everyone.
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