Where is the IAC valve located?

Tiny
ARMINRODRIGUEZ
  • MEMBER
  • 2019 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
RPM at idle are always at 0 and I can feel the engine struggling sometimes. No warning lights or anything and it has been like that since I bought it.
New transmission at 35,000 miles and lifter problems so I rebuilt the engine at 48,000. But the RPMs still the same not a 100 or 200, needle is at 0 when idle.
Wednesday, June 4th, 2025 AT 9:45 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 15,233 POSTS
If the engine is running but the dash reads zero, does it do anything when you rev it? The problem sounds like a failed stepper drive for the tachometer, or it has an ignition issue, so the tachometer signal is wrong. I would go over the wiring and in particular the ground strap that runs from the back of the engine to the frame. They like to fail and you get a lot of strange things when that happens.
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Wednesday, June 4th, 2025 AT 9:58 AM

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