Well I've got a problem and hope someone here has experience in this area. My 1991 80 series LC needed a new exhaust, I had been patching it up just forward of the CATs for a few years now. My local Muffler shop did the work, replacing the pipes from the header to the crossover pipe, which they welded in a few spots. This included adding new CATS but they used the same O2 sensors. When I picked it up, after hours, the CEL was on and the truck ran rough, especially at stoplights and signs. I called them the next day and they thought the light was on when I brought it in, it wasn't. Anyways, I took it back and they were unable to get the CEL off or smooth out the roughness. I have it now and the first thing I though to do was take out the EFI fuse for 15 minutes to reset everything, hoping that would do the trick. When I went into the fuse box the EFI fuse is missing! I have to admit, in the 7 years I've owned the truck I've never noticed whether it was there or not, the place where it goes is a little gnarled up and dusty so I don't think the shop removed it. I assume it has been missing since I bought the truck. Anyways, can anyone tell me first of all, why is the fuse missing? Is it a practice amongst some owners to disable the EFI? Why would my truck run so well (before this) if the fuse was missing? What should I do now? Should I replace the fuse? Can I jumper the fuse leads (I don't know why)? How do I get the CEL to clear now? The muffler shop used an OBD1 scanner (it showed codes for both O2 sensors, nothing else) and couldn't clear the CEL, is there a way to clear it without the scanner and with no EFI fuse? Does anyone have an idea why the codes even came on, would just taking out the O2 sensors and reinserting them cause this?
Sorry for all the newbie questions, not new to my LC but new to these electrical issues and there are no experts in any dealerships or shops anymore that have knowledge about these things anymore, I guess 1991 was too long ago and all the techs from that era have retired. Thanks in advance, Bob Nancarrow in Michigan.
Sorry for all the newbie questions, not new to my LC but new to these electrical issues and there are no experts in any dealerships or shops anymore that have knowledge about these things anymore, I guess 1991 was too long ago and all the techs from that era have retired. Thanks in advance, Bob Nancarrow in Michigan.