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Old 04-01-2012, 11:14 AM   #1
MacG
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1992 SL2
Default High Idle then code 49

Hey All,

Posting on a road trip so not much searh capability. We got the high idle like it is stuck in cruise control and I forgot to cut it off and restart to test for a TPS but it threw a code 49 this time where as the last time it did not by the time I checked it anyway. Anyway I cannot look up the code on the ol Blackberry. Any help is appreciated.

...
MacG

'92 SL2 Manual Transmission ABS AC '94 HCE body panels

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Old 04-01-2012, 12:08 PM   #2
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Default Re: High Idle then code 49

It's saying vacuum leak. Check your vacuum hoses, sometimes the one going to the pcv valve cracks and causes this problem.

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Old 04-01-2012, 12:51 PM   #3
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2001 SC2
Default Re: High Idle then code 49

Hope this helps:
Quote:
Originally Posted by DifferentRacing.com
RPM - High Idle (Vacuum Leak)
The vacuum lines include the MAP sensor junction, PCV hoses, PCV valve, brake booster hose,
the fuel pressure regulator hose, throttle body, intake manifold gasket and throttle body minimum
idle adjustment. DTC 49 detects a leak in any of these lines which may cause the idle speed to
rise above the control of the IAC system. DTC 49 is detected when engine idle cannot be reduced
by the IAC motor and the IAC is determined to be working.


Diagnostic Trouble Code parameters:

DTC 49 will set if:

The engine is idling higher than desired rpm.
The IAC is working properly.

...
The proper way to fix a S-Series automatic is to replace it with a 5spd O:)

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