Alright guys, I have been lurking for a while, but now I need some help. My 01 Accord 2.3L threw a P0401 code earlier this week (250K miles, I know, you're jealous), I replaced the EGR valve, and the code threw again. Now I have removed the Intake Air Chamber (upper portion of the manifold) and cleaned the EGR passages of all the carbon build up (nasty!). After putting everything back together, the engine now rev's from about 1K to 2800K. What could be causing this, the IAC valve?
Before you guy post the search funstion, nothing mentions revving after cleaning the carbon build up...
It does not have a FITV, just the IAC. When its cold, it hunts from 1000 - 2800...when it warms up it jumps from 1000 - 1200 quickly... I have tried to check for vacuum leaks, but cannot seem to find any. Could it be possible that I may need to replace the gasket between the IAC and the Manifold itself? I cannot get to can behind the manifold to test for leaks as it is too close to the firewall...
could be a vacuum leak, get some brake parts cleaner and spray around anything you have taken apart with the engine running, if you find a spot that makes the engine idle down or up when you spray that area then you have a vacuum leak
OK Guys, here's a general mechanical tip for you...
When removing the upper chamber of the Intake Manifold, go ahead and spend the $10 to replace the gasket, do not try to reuse it, you will save yourself 2 days of trying to figure out when the damn vacuum leak is...
I think you would find the problem faster by spraying a can of carb/brake cleaner around the IM area. Unless you did do that. At least you found the problem.
yeah, the problem was that apparently the leak was on the backside of the manifold, where i could not really spray very well due to the proximity to the firewall. I sprayed around the front without detecting any leaks...
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