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Discussion Starter · #1 ·
I blew the EFI fuse on my 1990 mini (22re/stock). Replaced, was fine. Blew again, and again, and again. Blows as soon as I turn the engine over (or jump the connectors for the fuel pump).

What I have done:
new fuel pump
new fuel pump relay
Completely stripped entire wiring harness for engine (under hood -> O2 sensor. Haven't yet done the harness from the cab->tail-lights) and found no bad wires, no nothing. It's really torquing me off.

This is a daily driver and has been laid up for two weeks... any ideas? <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0">

bkg
 

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Originally posted by Rockota:
<STRONG>I blew the EFI fuse on my 1990 mini (22re/stock). Replaced, was fine. Blew again, and again, and again. Blows as soon as I turn the engine over (or jump the connectors for the fuel pump).

What I have done:
new fuel pump
new fuel pump relay
Completely stripped entire wiring harness for engine (under hood -> O2 sensor. Haven't yet done the harness from the cab->tail-lights) and found no bad wires, no nothing. It's really torquing me off.

This is a daily driver and has been laid up for two weeks... any ideas? <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0">

bkg</STRONG>

Check your wiring - it sounds like you might have a power wire (to the fuel pump) grounded or maybe the rubber coating has worn through somewhere & it is shorting out against bare metal & blowing the fuse. Is it possible to switch the wires going to the fuel pump? (dunno - never done it)
 

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Rockota,
you didn't look hard enough. Crawl under drivers side.... near cat converter and look at the oxy sensor....see that wire that is drooping kinda low and touching the hot pipe? There's your prob. I'm psychic.
 

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Originally posted by Rockota:
<STRONG>I blew the EFI fuse on my 1990 mini (22re/stock). Replaced, was fine. Blew again, and again, and again. Blows as soon as I turn the engine over (or jump the connectors for the fuel pump).

What I have done:
new fuel pump
new fuel pump relay
Completely stripped entire wiring harness for engine (under hood -> O2 sensor. Haven't yet done the harness from the cab->tail-lights) and found no bad wires, no nothing. It's really torquing me off.

This is a daily driver and has been laid up for two weeks... any ideas? <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0"> <IMG SRC="smilies/confused.gif" border="0">

bkg</STRONG>
Get a multimeter and check to see if the hot lead going to the fuel pump is grounded.... That was my problem on my Supra when it was blowing EFI fuses... It was the rubber insulator on the fuel pump bracket....
 

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I had the same problem and on mine it turned out to be a bad EFI relay. Replaced the relay and have not blown a fuse since. The relay is in the fuse block in the engine compartment on my truck. I have a 90 with a V-6
 

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Discussion Starter · #6 ·
Originally posted by Mr. Safety aka OOPS:
<STRONG>I had the same problem and on mine it turned out to be a bad EFI relay</STRONG>
What's teh difference between the "EFI" relay and fuel-pump relay? One parts store didn't list a fuel pump relay for my truck, just the EFI relay...
bkg

[ 09-19-2001: Message edited by: Rockota ]
 

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Discussion Starter · #7 ·
Originally posted by ZUK:
<STRONG>Rockota,
you didn't look hard enough. Crawl under drivers side.... near cat converter and look at the oxy sensor....see that wire that is drooping kinda low and touching the hot pipe? There's your prob. I'm psychic.</STRONG>
Hope you don't charge $4.99 a minute! <IMG SRC="smilies/wink.gif" border="0"> Actually, I checked that as well - I pulled the entire wiring harness from the O2 sensor up to the fuse panel apart and couldn't find anything. The wiring for the 02 sensor looked good - but I'll check again!
Thanks!
bkg
 

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Discussion Starter · #8 ·
Originally posted by SirFlipsalot:
<STRONG>Get a multimeter and check to see if the hot lead going to the fuel pump is grounded.... That was my problem on my Supra when it was blowing EFI fuses... It was the rubber insulator on the fuel pump bracket....</STRONG>
The rubber insulator where the wire goes through the pump housing (where it boltes to the top of the tank)?? Mine doesn't look good and that actually crossed my mind. I'll pull out the meter and start doing more searching.

Thanks!
bkg
 

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<FONT COLOR="Red"> If you have power windows, you can swap the power window relay with the EFI relay to see if that's the problem. At least my 85 4runner has these two relays and they are identical on my rig, I couldn't be certain for other years, but it's a cheap way to test.. </FONT c>
 

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Discussion Starter · #10 ·
Originally posted by Slick:
<STRONG><FONT COLOR="Red"> If you have power windows, you can swap the power window relay with the EFI relay to see if that's the problem. </FONT c></STRONG>
Thanks... but I don't have power windows..
<IMG SRC="smilies/frown.gif" border="0"> <IMG SRC="smilies/frown.gif" border="0"> <IMG SRC="smilies/frown.gif" border="0">
 

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Blown EFI Fuse

Toyota had just replaced my V6 under the headgasket recall, so I was heading up to the mountains when the truck just cut out, dead. Neadless to say, I was rather pissed. I called a friend at a Toyota dealership and he led me directly to the problem. The O2 sensor just in front of the cat converter had some wires that were laying on the exhaust pipe, the heat melted through to the metal and shorted the EFI. As soon as I pulled the wire off the pipe and robbed a fuse from some where else, I was back on my way.

It's just an option to look at.
 

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Discussion Starter · #14 ·
Re: Blown EFI Fuse

rochmpr said:
Toyota had just replaced my V6 under the headgasket recall, so I was heading up to the mountains when the truck just cut out, dead. Neadless to say, I was rather pissed. I called a friend at a Toyota dealership and he led me directly to the problem. The O2 sensor just in front of the cat converter had some wires that were laying on the exhaust pipe, the heat melted through to the metal and shorted the EFI. As soon as I pulled the wire off the pipe and robbed a fuse from some where else, I was back on my way.

It's just an option to look at.
Thanks... but yer about a year late. :flipoff2: :flipoff2:
 

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Year Late?

For what? My engine was just replaced about 3-4 months ago, but I was talking about the O2 wire laying on the exhaust pipe being a possible cause of your problem. So there :flipoff2:
 

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rochmpr---13 months ago I recommended the same that happened to you and it's back in this thread a bit. I know how I might find the short if I was looking for it.....I would use a buzzer....could even be the horn......and wire it in series with the battery. Then when the short occurred you would her the buzzer and the fuse will not blow....that way you could jiggle all the related circuits until you heard the short.
 

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Blown EFI Fuse

I worked for about 8 hours tracing wires throughout my vehicle. I finally found that a mechanic had done a poor job installing the 02 sensor, some of the wires rubbed on the exhaust pipe, and caused a dead short. Hope this helps people to not make my mistake and trace wires.
 
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