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Hello everyone, This is my first post and I have found this forum very helpful. I have a 1992 3.0 liter 4Runner and it has been throwing the CEL on with the code 71 . I have checked and repaired the temp wires at the back of the engine, looks like some mice got in the engine compartment and chewed a few things. But my main question is what are these two wires near the battery and below the EGR brown and green wires. Im wondering if they have something to do with the code 71 Thanks
Thanks Wallytoo, This 4runner is 1992, 4x4, auto trans with A/C, I think its the medallian model, and these two wires are located coming off the wiring harness that runs to the fuse box. I have added another pic with the two wire circled in red. I should add that the previous owner changed out the valve cover gaskets just before I purchased it
Slacker's picture is of the EGR Gas Temp Sensor (not a dashpot). I think that's limited to California vehicles (maybe Canada too). 250-Yota-Guy's EGR valve casting has the port (they all do), but I think the port is usually not tapped for non-California vehicles. 250-Yota-Guy's is tapped, but the rust tells me there has been no temp sensor in there for a long time.
The wires for the temp sensor should be BR-B and G-W. The wires in the picture could be those colors (a picture may be worth 1000 words, but not for wire colors).
If 250-Yota-Guy has a California vehicle, but the EGR valve was replaced with a "Federal" version, that could explain the missing sensor. But he should have code 71 for the missing sensor, unless someone has tampered with the ECM to suppress the code. (And if you were going to go to that trouble, why not just tape up the sensor connection?)
Thanks scope103, this 4runner was bought in Canada but that does not mean its not from Cali.
The wires are BR-B and G-W and does throw a code 71 everytime after the battery has been disconnected for problem solving
You mentioned that its the EGR gas temp sensor and just the other day I had a plastic fuel filler bubble and explode, this filter was not near any heat sources
Do you think they are related issues ?
Your engine uses a relatively high fuel pressure system for the injectors to work properly, and needs a fuel filter to handle the pressure.
Just by looking at that fuel filter, it looks like it is designed for low pressure fuel systems like you would find on a carbureted engine. That fuel filter probably just blew apart because it was not designed to handle the higher pressure.
Where was this filter installed anyway? You need a factory type fuel filter canister installed.
Thanks old87yota, I didnt think they could be related but the fuel filter was installed by the previous owner near the gas tank. They removed the factory one and ran all new fuel lines to the charcoal canister
The filter was not hot when I had to replace it with the plastic tube we found on the side of the road.
That "plastic tube" is part of a syringe. What part of town were you driving through?
I assume the hose clamps in the photo were what held your erzatz "fuel filter" in place. Rubber hose, screw-on hose clamps, Barbie fuel filter, .... This is all a recipe for a bon-fire. No wonder the prior owner unloaded it; I wouldn't drive it either.
And neither should you. You got lucky this time; the next time this ghetto fuel system lets go, you'll be close to an ignition source and your last few minutes on this earth will not be pleasant. Bending your own fuel line is an art form, but certainly doable, and not particularly expensive. Or buy the factory lines to be absolutely sure.
You probably have what Toyota calls a "C&C" vehicle, which I think means "Canada and ..." something. You may also have the downstream O2 sensor. A new sensor is pricey, but they are available aftermarket https://www.autozone.com/emission-co...toyota/4runner and used https://www.ebay.com/p/654740322?iid....c100855.m4779 You're missing the harness-side connector; you can either cruise salvage yards, or just replace both sides with any 2-pin sealed connector you can get from an electronics store.
Unfortunately, the gorillas that worked on your 4runner probably found it had an EGR problem, was throwing code 71, and in a fit of stupid rage just ripped out the sensor, connectors and all. So you'll have to fix that too. Some will suggest you can bypass the gas temp sensor to make the code "go away," but you'll never pass a smog check (if such is in your future), and you'll be poisoning the air you breath.
Thanks, Yeah it’s a ghetto fix for sure but when you’re an hour and a half from town and you do what you do to get home. Yeah the 4Runner is a work in progress. Just trying to get this thing fixed up with all the bugs worked out it’s not bad deal for 500 bucks. Yes it’s a syringe But not the type with the needle wouldn’t touch that for the life of me, it’s for cleaning out wounds. I’ll take your comments As somewhat helpful but also somewhat interesting. Thanks
Yeah, those fuel lines and filter need to be replaced before you drive this truck any further!
No need for a fire!
C&C is short for "Cab and Chassis". As the name implies, the Cab and Chassis models were models that only came with the cab and chassis, and no bed was installed. This way the new owners or companies could fit their own utility bed, camper, cargo box, etc. in place of the factory bed. I think I have only seen these available as 2 Wheel Drive models.
Jun 1, 2020 | 05:42 PM
