'87 4.9 rough idle/stall
06-12-2011, 07:52 PM
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'87 4.9 rough idle/stall
It sometimes dies right after starting, especially when cold. Even when warm, the idle speed seems to be pretty slow. At higher revs it runs beautifully.
I've run the codes. KOEO codes all pass, goes straight to 11. No stored codes. KOER returns a code 12 (RPM at idle out of range) and 41 (HO2S sensor voltage low/system lean).
Anybody got a place to start checking before I start throwing parts at it *****-nilly? Thanks!
I've run the codes. KOEO codes all pass, goes straight to 11. No stored codes. KOER returns a code 12 (RPM at idle out of range) and 41 (HO2S sensor voltage low/system lean).
Anybody got a place to start checking before I start throwing parts at it *****-nilly? Thanks!
