Check Engine Light Due to Engine Vacuum leak on Cadillac DeVille

The Check Engine Light may illuminate due to an engine vacuum leak from the intake manifold area.

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Average mileage: 90,860 (59,500–148,000)
6 model years affected: 2000, 2001, 2002, 2003, more2004, 2005
28 people reported this problem
15 people shared problem details
with the intake manifold cover removed you can hear the high pitched sound from the vaccum leak coming under neath the intake manifold. relaced intake gasket and other rubber hoses.
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2002 Cadillac DeVille120,000
i have a vaccum leak between air intake and throttle body after getting my starter replaced
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2004 Cadillac DeVille148,000
A sharp employee at Advance Auto when asked to read code took carb cleaner and sprayed around the passenger side of intake manifold. This caused the engine RPM's to increase. Remove the engine cover. A short vacuum rubber hose connection was replaced to fix the problem.
Rough idle and check engine light caused by vacuum leak in rubber pentium between TB and intake manifold. Repair cost $420
intake vacuum leak at the rubber boot connecting the plenum. Sprayed carb cleaner on it and engine revs up and runs smooth and I hear the vacuum noise of the spray being sucked in. One month ago heard a high pitched whistle when idling. Has since gone away.
vacuum leak to the right side of the intake manifold spraying starter fluid in the area causes a engine to rev up has very rough idling service engine soon light came on about a week later
2003 Cadillac DeVille125,000
Car was missing terribly. Check engine light on. Poor gas mileage. Mechanic replaced the gasket connecting the plenum. He said these cars were common for this problem. He charged me $200.00 including the cost of the part which was $34.00. The first garage diagnosed that I needed the plenum replaced and wanted $750 -$800.00. Watch out for this and get a second opinion. I`m glad I did.
engine ran rough..had it checked out and it had leak from intake manifold...parts were cheap , however, the labor was expensive to have it fixed.
2002 Cadillac DeVille140,000
Code, revving of engine, hissing noise. replaced boot connected to intake manifold, small tear underneath.
garage charged $345.00 to replace the vacuum hose. The replacement 90 degree T broke in less than 100 miles
Fixed the manifold intake vacuum gasket and all is well!
Rough idle and codes show lean on bank 1 and bank 2
SES light on steady. Diagnosed small vacuum leak at plenum; repaired for under $100 parts and labor by dealer in Williston, ND. Engine ran fine with the light on but was a little too lean, therefore the SES light went on when the system threw a code. No other hard or soft codes present; engine runs strongly as when new with 25 mpg avg. at 65 mph o high plains rural highways. Only problem ever had with this car or this engine. Honest small town local dealer; not like the thieves in LA and Phoenix and Palm Springs where I have lived before.
The Check Engine Light illuminates due to an engine vacuum leak from the intake manifold area.
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