smokey_mountain
Full Access Member
- Joined
- Sep 22, 2019
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My first post and my first GM truck. Came to American trucks from the world of Japanese 8-cylinders. I bought 5.3 Yukon as used with 7500 miles on it, still in warranty. While I like how this truck drives the idle seems to be unstable when both fully warmed up or cold, in D and in P.
Problem:
When I stop this 2018 5.3 4x4 6-speed Yukon SLE at the traffic while transmission is in Drive (fully warmed up engine) the idle is "fluttering" (feels like heart misses a half-beat, tach needle moves a tiny bit too). When engine is cold I also feel that "flutter". Same happens when the transmission is in "P" too. In "P" RPMs do increase but that does not seem cure the flutter.
I suspect that dealer will not detect anything or see anything and classify all is normal, however 2019 Tahoe 5.3 that I drove in is butter smooth. I am wondering if there are ways for me to narrow down the problem with idle. I know it could be dozens of things from leaky intakes to spark plugs or injectors. I hope this community points me to the areas to check. idle is notoriously tough to troubleshoot from my past experience especially on these electronic engines. Engine mounts if not properly replaced appear to be a source of it too.
Thank you in advance!
Problem:
When I stop this 2018 5.3 4x4 6-speed Yukon SLE at the traffic while transmission is in Drive (fully warmed up engine) the idle is "fluttering" (feels like heart misses a half-beat, tach needle moves a tiny bit too). When engine is cold I also feel that "flutter". Same happens when the transmission is in "P" too. In "P" RPMs do increase but that does not seem cure the flutter.
I suspect that dealer will not detect anything or see anything and classify all is normal, however 2019 Tahoe 5.3 that I drove in is butter smooth. I am wondering if there are ways for me to narrow down the problem with idle. I know it could be dozens of things from leaky intakes to spark plugs or injectors. I hope this community points me to the areas to check. idle is notoriously tough to troubleshoot from my past experience especially on these electronic engines. Engine mounts if not properly replaced appear to be a source of it too.
Thank you in advance!
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