1991 4runner AFM
02-09-2010, 06:55 AM
#2
Starting is not controlled by the AFM:
- http://www.4crawler.com/4x4/CheapTri...shtml#FuelPump
But after you move the key from START to ON, then the AFM takes over:
- http://www.4crawler.com/4x4/CheapTricks/AFM/index.shtml
- http://www.4crawler.com/4x4/CheapTri...shtml#FuelPump
But after you move the key from START to ON, then the AFM takes over:
- http://www.4crawler.com/4x4/CheapTricks/AFM/index.shtml
02-19-2011, 01:10 PM
#3
Registered User
Join Date: Oct 2009
Location: SO CAL
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
loose connection at afm
One possible cause, which "fixed" my slow start probelm, was that the connector was not making full contact to the AFM. The fuel pump only engages on start crank (1991 3.0). this would explain way if Pb is jumped your truck will start. It is a goofy illogical sytem.
02-19-2011, 02:06 PM
#4
Actually, some logic behind the system. Fuel pump on while starter is cranking is obvious, engine would not start otherwise. Having the AFM fP contact keep the pump running while the engine is running is a safety feature. How so? Engine runs out of gas and stops, fuel pump shuts off and prevents damage to it (cooled/lubricated by fuel) and if the vehicle is in a accident and the engine stops, fuel pump (and flow) is stopped to prevent fuel gushing out of a potentially ruptured fuel line.
Thread
Thread Starter
Forum
Replies
Last Post
BeMiceElf
Misc Stuff (Vehicle Related)
7
10-10-2015 09:40 PM
