FZJ80 94 CEL on code 26 after undercarriage power jet wash engine top totally dry, engine stumbled rough idle

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3 weeks ago I went into the desert for 3 days, the weather forecast was normal for the hot season. In the afternoon of the first day we started to get weather alerts (part of the navigation software) on flash flood danger in the part of the desert we were traveling. Nobody prepared us for the phenomena that come. In the west black clouds over the Mediterranean sea start accumulating. I built my tent without pouting the rainfly cover it was hot. After dark, we had an exceptional lightning storm that never recorded in Israel for hours we had 40-50 lightnings per minute. One boy camping near the sea with his family died from lightning strikes. I put the rain cover over the tent and went to sleep at 2 AM a lightning strike near our camp the very strong noise and light continue sleeping at 4 AM it started raining dogs and cats. Next morning all the creeks were flowing and all the desert becomes a big muddy hell. We crossed a lot of water passes and a lot of muddy trails the rig undercarriage was full of mud I made my way back home safely.

Fast forward, so I took it to the car wash to clean the mud I asked the professor that was operating the water jet machine not to come too close to the old rig, I was siting in the car, the engine was idling totally fine, until the professor could not resist and shoved the nozzle under the carriage at the driver seat. CEL on engine stumbles and dies. It started the engine very rough ideal I hold it in high RPM CEL on all the time.

Used Toyocom it was code 26, took it for a long drive, letting it dry after some time the Idle become reasonable, erased the code from the ECM and it did not come back.
A week ago I went for a 2 day trip with the Jeep Rubicon club. I wrote all about it the what did you do this weekend tread. No CEL no problem until the end of the second day. I had 3 miles of washboard trail until pavement. Got a CEL on and code 26. Very bad gas mileage on the way home.

This weekend I opened the O2 Sensors plugs bank 1 had some liquid in it bank 2 was dry, used a contact spray to clean the connectors.

Checked the wires they were good and the pins in the connectors.

77389588_2567144856740430_8654189909793308672_n.jpg


Close and cover the connectors with silicone tape

77326280_1365261696931444_1760503151850422272_n.jpg


Replace the dry split tube cover with a new one.

Used 2 pieces of bicycle tire inner tube to cover it all and waterproof it

75418863_432527480788314_2430323625446866944_n.jpg


72461758_3245141565557967_6330236578270543872_n.jpg


Tied everything up and away from the exhaust.

75196313_658358598026314_5819579702808936448_n.jpg


Looking at live data in the Toyocom Osiloscope that Bank 1 had a bad wave that is different from Bank 2. And now they are symmetrical and look the same
 
I had the same issue with mine when I power washed the undercarriage, but I disconnected the plugs let them air out and used dielectric grease so I wouldn't have the same issue.
 
I had the same issue with mine when I power washed the undercarriage, but I disconnected the plugs let them air out and used dielectric grease so I wouldn't have the same issue.

I thought about dielectric grease, but decided against it, I would use dielectric grease in most electrical plugs except O2 sensor old plugs.

I ordered new plugs (femael ECM side) with all the O rings new it should be waterproof until than a rubber condom.
 
3 weeks ago I went into the desert for 3 days, the weather forecast was normal for the hot season. In the afternoon of the first day we started to get weather alerts (part of the navigation software) on flash flood danger in the part of the desert we were traveling. Nobody prepared us for the phenomena that come. In the west black clouds over the Mediterranean sea start accumulating. I built my tent without pouting the rainfly cover it was hot. After dark, we had an exceptional lightning storm that never recorded in Israel for hours we had 40-50 lightnings per minute. One boy camping near the sea with his family died from lightning strikes. I put the rain cover over the tent and went to sleep at 2 AM a lightning strike near our camp the very strong noise and light continue sleeping at 4 AM it started raining dogs and cats. Next morning all the creeks were flowing and all the desert becomes a big muddy hell. We crossed a lot of water passes and a lot of muddy trails the rig undercarriage was full of mud I made my way back home safely.

Fast forward, so I took it to the car wash to clean the mud I asked the professor that was operating the water jet machine not to come too close to the old rig, I was siting in the car, the engine was idling totally fine, until the professor could not resist and shoved the nozzle under the carriage at the driver seat. CEL on engine stumbles and dies. It started the engine very rough ideal I hold it in high RPM CEL on all the time.

Used Toyocom it was code 26, took it for a long drive, letting it dry after some time the Idle become reasonable, erased the code from the ECM and it did not come back.
A week ago I went for a 2 day trip with the Jeep Rubicon club. I wrote all about it the what did you do this weekend tread. No CEL no problem until the end of the second day. I had 3 miles of washboard trail until pavement. Got a CEL on and code 26. Very bad gas mileage on the way home.

This weekend I opened the O2 Sensors plugs bank 1 had some liquid in it bank 2 was dry, used a contact spray to clean the connectors.

Checked the wires they were good and the pins in the connectors.

View attachment 2135468

Close and cover the connectors with silicone tape

View attachment 2135471

Replace the dry split tube cover with a new one.

Used 2 pieces of bicycle tire inner tube to cover it all and waterproof it

View attachment 2135472

View attachment 2135469

Tied everything up and away from the exhaust.

View attachment 2135470

Looking at live data in the Toyocom Osiloscope that Bank 1 had a bad wave that is different from Bank 2. And now they are symmetrical and look the same
I ran into this same problem 12 months ago with a code 26. I found that the way the factory plug is positioned that connects to that O2 sensor is the problem. The factory harness holds that plug vertically, and when water gets on that harness it runs right down that harness filling up the O2 connector.

That's because the bottom half of that connector is shaped just like a cup, with no way for the water to drain out. To correct that problem i just re positioned the harness so the plug is held in a horizontal position to keep any water from collecting inside that plug.

So far my simple fix has worked great. Below is a link to my thread with me finding the solution to the problem in post number 13.
 

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