toyotanick

ok, well i just realized that i have been running a 30 amp fuse as my 1990 toyota pickup EFI fuse when it only calls for a 15. so figuring that i was just out of 15's when i put it in i changed it back. well i left my dads shop and got about a block before it blew. so i have to run a 30 until i can figure it out.

does anyone have any ideas about what i could be? o and could this be a reason why my gas mileage is rediculously bad?!?!

abecedarian

possibly.
check the wiring around the transmission for any wires that may be shorting.
you may be able to put a 15 in and shake the wires until you can make it blow.

toyotanick

around the transmission? why would electronic fuel injection be around the transmission? o and this transmission is a manual if it makes a difference

abecedarian

the ecu powers lots of things...
anyhow, I've heard that O2 sensor wiring can short out quite easily due to where it runs.

toyotanick

ooooo ok well ill slap a 15 in there and start shakin wires tomorrow, but if that isnt it what else could it be?

waskillywabbit

iTrader: (-1)

Should be as easy to figure out as an SAS.

Cyberman

I just blew my EFI fuse, after finding out that the wiring going down the side of the engine melted against the EGR tube.

abecedarian

just looked at a wiring diagram and on 89/90 trucks, the 15a EFI fuse powers the ECU and all the sensors.

toyotanick

nah deinatelly not. this is electrical not mechanical

abecedarian

that's not nice... it's funny but not nice...

toyotanick

alright ill check all of those things tomorrow, thanks guys

vtjeenyus

also check the driver side frame rail where it passes beneath the engine
on mine the big pack of wires rubbed on the frame until it wore through
just an idea

just a 22re

dont the efi fuse power the fuel pump to? not sure but that could be it unless im wrong but that never happens

toyotanick

hahah way to be cocky! very nice. and is there any way to check the fuel pump or any tell tale signs that its going out?

annoyingrob

Yes, get a multimeter, and test the current draw of the fuel pump. I wouldn't be able to tell you what's a normal reading though.