high engine idle rpm
Thread Starter
Staging Lane
Joined: Nov 2012
Posts: 55
Likes: 0
high engine idle rpm So the other day I started up my Camaro and the engine wanted to idle cold at about 1900 rpm. I immediately shut the vehicle off after realizing the rpm was not lowering. The car had 1/4 of fuel and a unknown vacuum leak somewhere. I need help finding a solution to this problem. I have tried to do a smoke test and the leak didn't rear its ugly face. I have replace my IAC, TPS and MAF sensors. I have cleaned the throttle body and checked everything I can. What do you guys think the problem could be? It doesn't happen just when the fuel is at a 1/4 of a tank either. Just the first time in awhile since its happened.
When engine is cold Spray quick start around the intake and all vac lines when running. When the idle changes you found your leak. If that doesnt show up start checking every vac connection possible
TECH Fanatic
Joined: Dec 2017
Posts: 1,468
Likes: 266
From: Bossier City, Louisiana
An unlit propane hand torch with the valve open and flowing propane can also reveal a vacuum leak - less chance of causing an engine fire. But either method works for revealing a vacuum leak.
Rick
Rick
WD40 works too in a pinch but the ether makes a noticeable leap in idle vs others I have tried. Engine cold reduces fire risk tremendously but indeed, spraying flammable substances at a running engine requires some fire safety preparation and awareness. Always keep a CO2 extinguisher nearby, especially when working on carburetors lol
