Rough idle and SEL light after intake manifold replacement - TCCoA Forums
 
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post #1 of 5 (permalink) Old 08-16-2016, 11:16 PM Thread Starter
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Rough idle and SES light after intake manifold replacement

Hi all,

Intake manifold, all appropriate gaskets, plugs, plug wires, T-stat, and injector O-rings replaced about 8 weeks ago. Engine ran fine until about 2 weeks ago, when rough idle started and SES light simultaneously came on. I replaced IAC twice, but rough idle and SES light came back within a couple days. Engine otherwise runs smooth as silk; no problems. Any thoughts? Haven't yet pulled any codes.

Last edited by 30thAnniversaryCat; 08-16-2016 at 11:36 PM. Reason: typo error
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post #2 of 5 (permalink) Old 08-17-2016, 02:14 AM
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Could be a vacuum leak or egr malfunction, maf malfunction, etc. Once you pull the codes you should have a pretty good idea. Did you retorque the manifold after a heat cycle?

I love my V8, but I'd love it more if all 8 cylinders worked. (they do now)

My T-bird is like George Jetson's wife, you try to give her a little money, she takes the whole wallet.
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post #3 of 5 (permalink) Old 08-17-2016, 07:49 AM
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Without pulling the code, you are just guessing. I learned the hard way on that one before.

Quote:
Originally Posted by 1996Project-bird View Post
Did you retorque the manifold after a heat cycle?
First I heard of this. Then again, people are re-torquing everything these days, a little excessive if you ask me. I bet a lot of mechanics don't even torgue them in the first place, so as long as they were torqued on install, you are ahead of the game.

Al

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post #4 of 5 (permalink) Old 08-18-2016, 04:31 PM
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Quote:
Originally Posted by 30thAnniversaryCat View Post
Hi all,
... etc ... rough idle started and SES light simultaneously came on. ... etc ... Engine otherwise runs smooth as silk; no problems. Any thoughts? Haven't yet pulled any codes.
I have no idea what year your car is ... but when my 1995 did that I found it to be the tee in the vacuum line that operates the EGR, hole melted opposite the side leg. Dorman replacement and I added a shield behind it .... and I have a spare now in the glove box. http://forums.tccoa.com/7-engine-4-6...ml#post1818514

Now, my '92 ..... did need a new IAC, but that's a different apple.

A fine pair ... ... and whatever you do, Have a Safe Trip!

Last edited by CrystalPistol; 08-18-2016 at 04:42 PM.
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post #5 of 5 (permalink) Old 08-18-2016, 04:46 PM Thread Starter
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Quote:
Originally Posted by 1996Project-bird View Post
Could be a vacuum leak or egr malfunction, maf malfunction, etc. Once you pull the codes you should have a pretty good idea. Did you retorque the manifold after a heat cycle?
Pulled the code. Said it's the egr management valve. Looks like the vacuum hose to it is dried out/cracked. Could be the problem. Damnedest thing, though...SES light stopped glowing yesterday driving home from work without my fixing anything. Now idles fine again. WTF??!!
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