What causes low idle in FZ?

[RustyNailJustin]

Both of the FZJ's I have owned did this. Say you disconnect the battery for some reason then reconnect and for the first 2 or 3 min the idle is super low like 200 RPM it wont die but sounds like it should. Once it idles for a couple mins its back to normal. I am just currious what causes it ?

 

[cruiserdan]

Interrupting battery power to the EFI computer causes it to lose it's memory. The computer needs to re-learn operating parameters, idle speed being one of them. In short, it's normal to have that happen when you kill the power.


In some cases it will take several engine startup cycles to re-learn the proper idle speed.

D-

 

[RustyNailJustin]

I thought about that but needed to hear it. The reason why I question it when I was thinking it is because my FJ60 with a TBI and My FJ40 with a Vortec dont do it. THey dont care if you unplug um. Thanks

Justin

 

[cruiserdan]

The GM computers are not smart enough to care.........

 

[robbie]

This will happen more with the 91-94 model years with Pre OBDII fuel systems. This should not happen with the 95-97 model years with OBDII. So I did not see what model years you have, so I am more guessing then knowing. later robbie

 

[RustyNailJustin]

both of them are 93s

 

[landtank]

USFSIHC, most of us include the vehicle info in our sig line so we don't forget.

 

[RustyNailJustin]

There... thanks for the pointer.

 

[Rookie2]

There... thanks for the pointer.

Show-off

 

[cruiserdan]

1993 FZJ80,Factory difflocks
1987 FJ60,Topless,bobbed,1tons,atlas,TBI,40 inch swampers.
1977 FJ40,4link,3link,onetons,atlas,Vortec
1974 FJ40,FJ60 axles,350
1966 FJ40,stock and in exelent shape!
2002 Dodge2500,Cummins,tow bitch.



So, it appears that you are new to Cruisers then.


I DO admire your taste in trucks though......

 

[RustyNailJustin]

1993 FZJ80,Factory difflocks
1987 FJ60,Topless,bobbed,1tons,atlas,TBI,40 inch swampers.
1977 FJ40,4link,3link,onetons,atlas,Vortec
1974 FJ40,FJ60 axles,350
1966 FJ40,stock and in exelent shape!
2002 Dodge2500,Cummins,tow bitch.



So, it appears that you are new to Cruisers then.


I DO admire your taste in trucks though......

Thanks! I like my taste in trucks too