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-   -   high idle RPM after 2.4 manifold swap (http://www.saturnfans.com/forums/showthread.php?t=223680)

kevin.st56 09-19-2016 09:38 PM

high idle RPM after 2.4 manifold swap
 
long time no see

i recently done the 2.4 LE5 intake manifold swap on my ion.
all iv done was replace the manifold itself, and the brake booster vacuum hose since the location is further than the 2.2 IM.
i have no added the adapter plate to fully fit the 2.2 TBC TB to the manifold, but is still installed securly with 3 of 4 bolts.

the problem i am having now is that my idle RPMs stay around 1100 RPM a few minutes after startup, which in turn, triggers the P0507 code, adding to the existing P0455 iv been having for quite some time before the swap.
i can confirm that the the TB is fully secured to the manifold and that there is no vacuum leak there, and that the replacement brake booster hose is not leaking either.
the purve solenoid hoses are secured correctly also on the manifold and the solenoid itself.
the engine also makes a noticable chirping sound, which disappears above 2k RPM.
one more thing too, when i turn on the AC, RPMs then go down to the normal idle RPMs around 700. idk if thats due to the load the AC putting a load which balances out the RPMs.

On the plus side, there is a noticable performance increase, enough to overcome the drag my AC puts on when its turned on.
Havent been able to get improved mpg from the swap due to the high idle RPMs bringing it down.

and as im finishing up typing this post, i just thought about the intame manifold gasket between it and the engine.

billysvue 09-19-2016 11:50 PM

Re: high idle RPM after 2.4 manifold swap
 
Have you run an unlit propane torch around the engine bay to rule out a vac leak?

kevin.st56 09-20-2016 12:26 AM

Re: high idle RPM after 2.4 manifold swap
 
Dont have any propane.
How an i going to see any leaks with it?

kevin.st56 09-20-2016 12:44 AM

Re: high idle RPM after 2.4 manifold swap
 
TLTE: just googled how to use propane. I might be able to get my hands on a small bottle

billysvue 09-20-2016 06:43 AM

Re: high idle RPM after 2.4 manifold swap
 
[QUOTE=kevin.st56;2211519]Dont have any propane.
How an i going to see any leaks with it?[/QUOTE] THE idle should change when it sucks the propane in through a vac leak.

kevin.st56 09-20-2016 06:36 PM

Re: high idle RPM after 2.4 manifold swap
 
Checked with my dad to see if he had a bottle of propane, but all his were empty.
Took a piece of hose to use as a stetjoscope and found a spot under where the manifold meets the head.
Took the manifold off, and i found a crack on the manifold body before it loops around to the head.
I have some epoxy on it to aeal it, and imma try it once its dried.

billysvue 09-20-2016 06:54 PM

Re: high idle RPM after 2.4 manifold swap
 
[QUOTE=kevin.st56;2211631]
Took the manifold off, and i found a crack on the manifold body before it loops around to the head..[/QUOTE] YOur new mani has a crack? Jeez, you think you were too rough on in during install or just didn't inspect it well, prior to?..

THere are plastic compatible epox's for just a few bucks at WAlly WOrld, Home Cheepo , Blowes etc...... Dont rush the prep( acetone should clean well) and might want to crosshatch area gently with a razor knife to add some 'tooth' to the surface prior to ...

kevin.st56 09-20-2016 09:41 PM

Re: high idle RPM after 2.4 manifold swap
 
I never checked it prior to installing.
Once it cured, reinstalled the manifold. Since the engine was cold, it doesnt do the high idle.
Once the engine warms up after a few minutes, then the idle increases.

We ended up finding a bottle of propane, passed it around the manifold, TB, purge solenoid, and brake booster, and there was no change in idle.


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