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2001 Deville DTS
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2 Posts
Discussion Starter #1
After successfully replacing the starter, the engine now revs up at extremely high rpms. Initially, the idle was low and rough. Assuming it was lack of fuel in the lines, I
gave it some gas, to which the engine decided to let loose and rev really high, essentially flooring it on its own.
We took the manifold back off to check connections and gaskets, all while cleaning with starter fluid and
applying "the right stuff" to ensure a good seal on all eight gaskets and as well as the connection from manifold to plenum. The plenum itself appeared to be in good shape.
After ensuring good seals, the engine is still revving at extremely high rpms. Could this be the throttle body positioning sensor?
This is for a 2001 cadillac deville DTS.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,268 Posts
We took the manifold back off to check connections and gaskets,
all while cleaning with starter fluid

starter fluid/either is NOT good for cleaning stuff -
it evaporates immediately - and is almost explosive in nature -
carb/throttle body cleaner - or brake cleaner -
would be a much better choice -

and applying "the right stuff" to ensure a good seal on all eight gaskets
what did you do/use?
NOTHING is actually the "right stuff" to apply to the intake seals -
I HOPE you didn't use silicone -

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clean the throttle body -

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check for Diagnostic Trouble Codes -
if you don't know how - go here and read the ENTIRE post -

http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/138257-how-pull-codes-dtcs.html

if you have any codes - post them here -
ALONG WITH THEIR DEFINITIONS -
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,448 Posts
Proper torque of 89 lb/in (7.5 lb/ft) on the intake manifild bolts, NO sealants on the port seals or plenum spigot. PCV dirty air line properly connected, with no broken pipes or connectors ? All TB vacuum lines checked for integrity ? As posted, maybe a scummy outer TB and throttle butterfly. In Tech Tips.

Dollars to doughnuts the (old) plenum is now ripped/cracked.

Pictures/diagrams on all this in my albums. Click my username, open the profile. Left column, 2 albums 6 pages of Northstar stuff.
 

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Registered
2001 Deville DTS
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2 Posts
Discussion Starter #4
"NOTHING is actually the "right stuff" to apply to the intake seals - "



In this case, "the right stuff" is a brand of gasket sealant.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,268 Posts
"NOTHING is actually the "right stuff" to apply to the intake seals - "



In this case, "the right stuff" is a brand of gasket sealant.

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In this case, "the right stuff" is a brand of gasket sealant.
well - in THIS case - "the right stuff" is the wrong stuff -
 

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Deville 2003
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1 Posts
Well, I smeared a little sealant on my intake gaskets (the kind that just stays tacky) and it didn't hurt it one bit. That was about 40,000 miles ago. She still runs smooth as ever.
 
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