High/Hanging Idle - Page 3 - ZR-1 Net Registry Forums

ssmith95 · 5 Days Ago

Im headed towards buying a smoke machine. This car has got me totally stumped. I tested two separate IAC valves tonight and both are fully seated in the passage. I used a curved pick to see if the pintle was fully seated and it was.

What is the lowest possible point a vacuum leak could occur, the injector housing gasket?

ssmith95 · 3 Days Ago

Smoke test was revealing. The MAP line had a tiny leak around the nipple on the plenum, smaller line fixed that. I also can see smoke coming from two locations deep under the plenum. One coming from possibly around the actuator between cylinder 6/8 and the other deep below the injectors on cylinder 2.

Anyone thoughts on what could be leaking in those areas?

Looking at some diagrams, looks like the bearings for the secondary throttle shafts are roughly in these locations.

5 Days Ago	#21
ssmith95 Join Date: Oct 2024 Location: Texas Posts: 12	Re: High/Hanging Idle Im headed towards buying a smoke machine. This car has got me totally stumped. I tested two separate IAC valves tonight and both are fully seated in the passage. I used a curved pick to see if the pintle was fully seated and it was. What is the lowest possible point a vacuum leak could occur, the injector housing gasket?

3 Days Ago	#22
ssmith95 Join Date: Oct 2024 Location: Texas Posts: 12	Re: High/Hanging Idle Smoke test was revealing. The MAP line had a tiny leak around the nipple on the plenum, smaller line fixed that. I also can see smoke coming from two locations deep under the plenum. One coming from possibly around the actuator between cylinder 6/8 and the other deep below the injectors on cylinder 2. Anyone thoughts on what could be leaking in those areas? Looking at some diagrams, looks like the bearings for the secondary throttle shafts are roughly in these locations.