plenum and runners?
Thread Starter
Instructor
Joined: Mar 2002
Posts: 106
Likes: 0
From: yardley pa
plenum and runners?
Is the inside of the plenem and runners supposed to be clean i took mine off and they are all black inside almost like oil. Is this bad or is this normal? I tried to wipe them done but its tough to get in there. Could this cause any problems if there real dirty? thanks Ron
Team Owner
Joined: Sep 2001
Posts: 62,127
Likes: 1,727
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: plenum and runners? (siberianhusky911)
its carbon deposits, and it can hurt airflow (hp), but you could take it off and try to clean it a little
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: plenum and runners? (siberianhusky911)
That's normal; due to the EGR exhaust gas feedback.
I took my used base to a local engine builder and had it hot sprayed for $30. It came out very nice and much easier than doing it with carb cleaner as I use on the runners.
One metod I've used on the runners is to spray 1/2 a Scotch Brite pad with carb cleaner and use a section of 3/4" heater hose to pass it through each runner, several times. I finish up with carb cleaner on paper towls.
Unless you have a solvent tank, having someone clean em up is much easier and, to me worth the few $$.
The problems arise when the EGR valve carbon's up and sticks or you get buildup in the TB and on the throttle plates and in the IAC bore. Buildup in the plenum, runners & base isn't usually a problem, but do you realy want to put those dirty pieces back onto your motor??:eek:
I took my used base to a local engine builder and had it hot sprayed for $30. It came out very nice and much easier than doing it with carb cleaner as I use on the runners.
One metod I've used on the runners is to spray 1/2 a Scotch Brite pad with carb cleaner and use a section of 3/4" heater hose to pass it through each runner, several times. I finish up with carb cleaner on paper towls.
Unless you have a solvent tank, having someone clean em up is much easier and, to me worth the few $$.
The problems arise when the EGR valve carbon's up and sticks or you get buildup in the TB and on the throttle plates and in the IAC bore. Buildup in the plenum, runners & base isn't usually a problem, but do you realy want to put those dirty pieces back onto your motor??:eek:
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: plenum and runners? (corvette0096)
Oops, my bad. I foregot about the PCV on the left and the breather feedback on the right. I guess these two may be causing the oily film.
Team Owner
Joined: Sep 2001
Posts: 62,127
Likes: 1,727
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: plenum and runners? (corvette0096)
65Z01. If you dont use the egr the intake and heads will be clean?
