We could both be correct. A leaking intake manifold gasket can certainly cause a misfire on a particular cylinder due to a lean condition there. And of course, along with the leak is going to be slightly increased engine idle RPM in which case the idle air control valve would close and reduce the RPM to where it should be. Now it is time to go the other way, and it may not be happening. It is also possible that if you disconnected the battery for this service, the PCM needs to "re-learn" idle air control valve position. And if it is sticking or non-functional, it doesn't learn very effectively.
Either way, if the PCM is seeing the same throttle position sensor voltage that it has seen for the last 6-7 years at closed throttle, it should command the idle air control valve to let more air in to increase idle RPM. That is not happening for whatever reason or the air bypass port is clogged up. You just adjusted the idle the old school carburetor days way, which can make it run just fine for a long time.s --- In [email protected], J Phillips <mopar_superb...@...> wrote: > > Geoff & Paul, > > I completely understand what you both are telling me, and my "fix" was the wrong thing to do. But that's only true if the idle adjustment was set correctly at the factory. > > With only the intake plenum gasket changed, there should have been NO change in idle RPM's.....none. In my case it refused to run due to such low RPM's. > > If the reverse situation happened: Changed the intake plenum gasket and the idle RPM's went up....the first thing that would pop into anyone's head....intake gasket leak. > > My theory is that I "Fixed" an unknown intake gasket leak. Unknown when the idle screw was locked. > > We are carpooling in it everyday this week, then a (2) tank trip this weekend. I'll let you know the fuel economy. (It was getting (24) mpg with the #5 fuel injector down.) > > Thanks, > Jay > ------------------------------------ Web: <http://groups.yahoo.com/group/dodge_intrepid> Subscribe: <mailto://[email protected]> Unsubscribe: <mailto://[email protected]> Moderator: <mailto://[email protected]>Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dodge_intrepid/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dodge_intrepid/join (Yahoo! ID required) <*> To change settings via email: mailto:[email protected] mailto:[email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
