IAC gasket?

[UNL1MTD]

Is there a gasket to seal the IAC to the Throttle Body?

 

I recently cleaned out my throttle body with it installed on the mj, so all I did was remove the intake and sensors. Cleaned the IAC, reinstalled sensors, and did the throttle body cleaning with the mj on. All seemed good, but now when I'm engine braking I get a substantial whistling from the engine bay. Overall the truck does idle better now, it used to almost stall when I was just idling, then catch itself and rev-up way too high.

 

I did see an o-ring as part of the IAC, but there was so much carbon I couldn't tell if there was a very thing gasket or not. As this was the last thing I changed, chances are its the source of the problem.

 

Truck specs - '87 2wd 4.0L 5speed

[BLHTAZ]

Nope...no gasket, just the o-ring. Double check that everything is tight and that there are no loose vacuum connections. If it's running good, I can't imagine anything being loose, but you never know.

[Confedneck]

whistling can also signal a bad IAC

[UNL1MTD]

 

Thats what I started with. Looking at it more and hearing that there is no gasket, I think I will get a new o-ring and try that out. If that doesn't work, I'll drop $60 on a new IAC. Just hard to believe the sensor is bad if the truck is running better than before.