skyb44
NAXJA Forum User
- Location
- Fort Collins Colorado
I've done a fair bit of troubleshooting so here's the story
1000 rpms on startup
1200-1250 warm (consistent)
good throttle response, decent gas mileage (17-20)
the 1250 rpm occurred after cleaning the throttle body, previously tended to be around 1000 warm, which i would still consider on the high side of normal.
checked-
function of IAC- I threaded the plunger in, reinstalled without the connector- idle was initially high (2000) plugged back in, IAC reigned it back in to 1200 rpms again.
looked for vacuum leaks using the "spray carb cleaner at your vacuum lines and listen for a change in idle" trick.
coolant temp sensor under exhaust manifold seems good- 600 ohms warm
air temp sensor in intake manifold also reads around 600 ohms warm
TPS is at 17% of reference voltage per maths/volt meter.
About the only thing i can think is that the IAC is getting stuck before it can fully close off the idle passage.
I suppose vacuum leaks are still a possibility as this jeep is old as dirt (though in good shape) some of the lines look kind of rough.
1000 rpms on startup
1200-1250 warm (consistent)
good throttle response, decent gas mileage (17-20)
the 1250 rpm occurred after cleaning the throttle body, previously tended to be around 1000 warm, which i would still consider on the high side of normal.
checked-
function of IAC- I threaded the plunger in, reinstalled without the connector- idle was initially high (2000) plugged back in, IAC reigned it back in to 1200 rpms again.
looked for vacuum leaks using the "spray carb cleaner at your vacuum lines and listen for a change in idle" trick.
coolant temp sensor under exhaust manifold seems good- 600 ohms warm
air temp sensor in intake manifold also reads around 600 ohms warm
TPS is at 17% of reference voltage per maths/volt meter.
About the only thing i can think is that the IAC is getting stuck before it can fully close off the idle passage.
I suppose vacuum leaks are still a possibility as this jeep is old as dirt (though in good shape) some of the lines look kind of rough.