which afm?

Beastmaster · Post by **Beastmaster** » Wed Jul 25, 2007 6:42 pm

which is the correct afm for a 95 3.9 hot wire v8, 3am or 4am im not using the hegos (14cux eec)

Beastmaster · Post by **Beastmaster** » Thu Jul 26, 2007 7:59 am

Or 5 am ?

K4000JB · Post by **K4000JB** » Sat Sep 15, 2007 8:54 pm

hi in my experience there is no difference between the 3am and 5am i have had them both fitted to my engine

Seight-V8 · Post by **Seight-V8** » Sun Sep 16, 2007 8:06 am

hiya,

I've just fitted a 3.9 efi to my v8, and it has the 3AM (hitachi) airflow meter.

But i am sure the 5AM (lucas) airflow meter has the same plug and fits with no mods at all.

The lucas one has better reliability i think.

5AM fitted on late 3.9s, and all 4.2s i think and some jags.

5AM more expensive also.

scott

rob b · Post by **rob b** » Sun Sep 16, 2007 1:22 pm

i believe 5am is meant for catylyst equipped engines and 3am for non cat engines but both have the same plug. my engine has no cats and it HAD 5am which was faulty so i replaced with 3am and it works fine