View Full Version : high idle - 89 307

04-02-07, 11:53 AM
i just replaced the intake manifold gasket and put new gaskets on the carb while it was off. i took some pics of the vacuum hoses...so they look like they are ok. but now she has a really fast idle. without a tach its hard to gauge but if before it was idling at 600, now it must be about 900-1000 rpms.

any ideas on how to narrow down my problems

04-02-07, 04:52 PM
Sounds like a vacumm leak. Spray some starting fluid around the manifold and carb base while the engine is running, when the idle increases you have found the leak.

04-04-07, 12:29 PM

04-04-07, 09:26 PM
I second the vacuum leak... You have to follow a specific pattern when installing the intake manifold, if not installed correctly it is likely that is the cuplrit.

What kind of gaskets were installed?

04-09-07, 09:37 AM
one of the vacuum lines did have a slight crack in it. hate those pesking little things....

im seriously considering putting in a tbi engine just to eliminate them