EFI Fuse

pigbuggy · 12-12-06, 07:23 PM

check engine light has been on for a couple thousand, hasnt effected anything really, but i finally got around to reading it with the OBDII. "system 2 Lean Bank 1.' so i suspect the o2 sensor would be the first thing to check, if not, then the injector, and then (hopefully not) the catalytic converter. anything else i'm overlooking?

so now that i have all the info off of the engine, its time to get that check engine light off of the dash. so i pulled the EFI fuse for a minute or so, turned it back on...still there. am i pulling the wrong EFI fuse? should i have pulled the EFI Main fuse instead of the 15A EFI fuse? maybe i didnt pull hard enough, but i couldnt get the Main EFI out, so i figured maybe it wasnt supposed to. help?

619TOY · 12-12-06, 07:43 PM

Have you read that this will reset the CEL ? I havn't had good luck resetting CEL's on just about any import. A Ford on the otherhand will almost always reset airbag lights by disconnecting the battery for a little while. You might try that as long as you don't have an anti-theft radio that might give you grief. I had my battery out of my LX for a few hours and didn't even lose my radio presets. An OBD tool will do the trick but the light will just keep coming back until the problem is fixed.

MARLIN375 · 12-12-06, 08:00 PM

I have page 6-14 of my TLC haynes manual marked with my code reader (3" jumpwire).
I read abit further and your 96 is different.(OBDII)
My buddy has a 96 and disconects battery to clear his reoccuring "bad O2 sensor" code.

CJF · 12-12-06, 09:09 PM

Quote:

Originally Posted by 619TOY

the light will just keep coming back until the problem is fixed.

C'mon folks; that's the key here. Yes, pulling the EFI fuse should clear the code *once the problem's resolved*. Replace the O2 sensor; they wear out like spark plugs, and a bad one affects both mileage and performance.Curtis

CJF · 12-12-06, 09:10 PM

Quote:

Originally Posted by MARLIN375

My buddy has a 96 and disconects battery to clear his reoccuring "bad O2 sensor" code.

Sorry, but that's just plain stupid.

MARLIN375 · 12-12-06, 11:52 PM

Quote:

Originally Posted by CJF

Sorry, but that's just plain stupid.

CJF he knows that sensor needs to be replaced......(he is driving an 80, wich means he is not a tard) just hates the CEL untill he gets it replaced

MoJ · 12-13-06, 05:25 AM

Quote:

Originally Posted by pigbuggy

am i pulling the wrong EFI fuse? should i have pulled the EFI Main fuse instead of the 15A EFI fuse? maybe i didnt pull hard enough, but i couldnt get the Main EFI out, so i figured maybe it wasnt supposed to. help?

It sounds like you're pulling the correct one - just a regular old 15A blade fuse identified as EFI on the cover of the engine bay fuse block. This resets the CE light. You can also accomplish the same thing by disconnecting the battery.

Just a possible quick fix - Take a look at the wiring running to the 02s at the cats. A few members have reported it comming loose from its plastic retainer and rubbing on the driveshaft, eventually wearing away the insulation.

Driley · 12-13-06, 08:27 AM

I do not know about the rest of you, but whenever I pull the EFI fuse I get the weird idle syndrome for about 24 hours.

I have been wearing a code 72 (EGR) for about a year now and just put a business card in front of it so I don't have to look at it all the time.

I check the code about every couple of weeks (paper clip) the make sure there is nothing new. I know, just fix the damn EGR and be done with it!

I am finally down to 2 vehicles (sold 1997 Chrysler Town & Country 140,000 miles - Sold 1980 BMW 633CSi 104,000 miles - Purchased 1991 BMW 735i 152,000 miles) so maybe now I can start paying attention to the LC. It just has never let me down! Every other car will get some type of problem that demands I spend time and money to get it running again, but the LC just keeps on running!

Anyway, just do not be surprised to get a weird idle after pulling the EFI fuse. My understanding is that it needs to reset itself and it takes a few start ups to find a happy place.

Riley

Grench · 12-13-06, 08:38 AM

Just a note for those of you with a late? 1995 or later...

If you're getting the codes out you have a code reader that can likely reset the code log. You don't need to be pulling the EFI fuse.

pigbuggy · 12-13-06, 09:09 AM

i guess i didnt wait long enough. went to school this morning, and realized that it wasnt that the light wasnt on anmore. i'll replace the O2 sensor later this week, and put some fuel injector cleaner in.

MARLIN375 · 12-13-06, 06:05 PM

Quote:

Originally Posted by Driley

I do not know about the rest of you, but whenever I pull the EFI fuse I get the weird idle syndrome for about 24 hours.

Riley

Did not notice the the idle diff during the summer but now that it is below zero at startup my 80 seems to forget what the temp was before the fuse was pulled and my cold start is low rpm and rough for 2-3 cycles before correcting its self.

my 93 gets a 2-8 code (post cat O2 sensor) when I forget to hit the ECT button pulling my sled trailer up the mountain. I think she lugs a bit and fuel is not properly consumed thus tripping sensor......just a theory.

MoJ · 12-13-06, 07:40 PM

Quote:

Originally Posted by Driley

I do not know about the rest of you, but whenever I pull the EFI fuse I get the weird idle syndrome for about 24 hours.

Completely normal. The ECU has to re-learn its postion. It generally takes 3-4 on off cycles to get back to normal.

Quote:

Originally Posted by Driley

I have been wearing a code 72 (EGR) for about a year now and just put a business card in front of it so I don't have to look at it all the time.

I check the code about every couple of weeks (paper clip) the make sure there is nothing new. I know, just fix the damn EGR and be done with it!

Riley

Read this thread - worked perfectly on my 94 and is a very easy no-cost fix.

EGR code 71 1994 fzj80 - cleaning temp sensor

80krazE · 12-13-06, 07:49 PM

Quote:

Originally Posted by pigbuggy

.....so i suspect the o2 sensor would be the first thing to check, if not, then the injector, and then (hopefully not) the catalytic converter. anything else i'm overlooking?

Most people assume that CEL means O2 Sensor. Not saying that O2 isn't the case a majority, but there are other trips. I would advise you to look at the EGR/Valve vacum switch. I believe that it will throw code PO401. Two seperate pieces that work in tandum and should take no more than 1.5 hrs to change. Just tyring to help out, Good luck!!

-jordan