91 YJ 4.0 litre start up

sledd

New member
Do all 4.0 litre rev up to about 1500 rpm on start up when cold or hot? Mine does and then drops down to about 900 rpm after a few seconds.I change all the sensors and its the same.Is this normal?thks........
 

Mine does it. 1500 seems a little bit high, but my 93 deffinatley winds up a little when I start it. I don't remember if a 91 is EFI or carburated, that would make a difference too.
 
Its fuel injected as it was the first year. It runs strong and never lets me down,so I guess its o k.thks..
 
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