scottyp Posted March 19, 2015 Report Share Posted March 19, 2015 Hi everyone, I'm having a little bit of trouble with my 01 Mustang Gt. It's mainly stock except for exhaust, cai, and a typhoon intake manifold that was installed by the last owner. I noticed a few weeks ago while driving on the highway my rpm's would drop a couple hundred then go back up a couple hundred rpm's. It does this around town as well. I decided to clean out my throttle body and maf with maf cleaner. Then the next day my engine light turns on for a P1506 (idle air control over speed error) and I notice my idle in Park is a little high, it's at 1000-1200 rpm. From doing research online I decided to clean out the idle air control valve. That didn't fix it. The I replaced the pvc and also replaced all of the hoses incase there were any cracks. That didn't fix it. I went back and cleaned the throttle body and maf again. Didn't fix it. Replaced the iac valve with one from Autozone. Didn't fix it. I'm also clearing the engine code after I try something new, then I drive the car for about 10 mins and then the engine light comes back up. I'm not sure what else to look for. Anyone have any ideas? Thanks! Link to comment Share on other sites More sharing options...
Blackmage Posted March 20, 2015 Report Share Posted March 20, 2015 you could check for a vacuum leak with a propane torch. Dont light it, just open the valve on the torch and bring it around the engine bay around your intake manifold gaskets and vacuum hoses. If there is a vacuum leak it will suck in the propane and the RPM's will raise. quick easy way to check that stuff. Link to comment Share on other sites More sharing options...
Det_Riot Posted March 20, 2015 Report Share Posted March 20, 2015 you could check for a vacuum leak with a propane torch. Dont light it, just open the valve on the torch and bring it around the engine bay around your intake manifold gaskets and vacuum hoses. If there is a vacuum leak it will suck in the propane and the RPM's will raise. quick easy way to check that stuff.Uhhhh I've never heard of this.......I think the same thing can be accomplished with carb cleaner? Link to comment Share on other sites More sharing options...
Blackmage Posted March 20, 2015 Report Share Posted March 20, 2015 Uhhhh I've never heard of this.......I think the same thing can be accomplished with carb cleaner?try it once. it works pretty well actually! its everyone on the internet too... although carb cleaner works, it gets everywhere you dont want it. especially if you have painted surfaces somewhere and it decides to eat through some stuff that isn't clear coated properly. Link to comment Share on other sites More sharing options...
Solar Posted March 21, 2015 Report Share Posted March 21, 2015 smoke machine helps too. Link to comment Share on other sites More sharing options...
