3FE cold start woes (1 Viewer)

[TheElegantFox]

View attachment 2976111Managed to get it off it a deep socket with some light coolant drainage. I think I need to order a new one just because the PO rubber glued the wires with clamp ends to the plug contacts. I took it out and tried to get the gunk out to clean the metal contact area but it’s still pretty sketchy.

View attachment 2976112

This wiring.

View attachment 2976111Managed to get it off it a deep socket with some light coolant drainage. I think I need to order a new one just because the PO rubber glued the wires with clamp ends to the plug contacts. I took it out and tried to get the gunk out to clean the metal contact area but it’s still pretty sketchy.

View attachment 2976112

I put the wires back wrong in this photo, but I did fix it after.

 

[Engineer8000]

That is supposed to be a sealed connector.

 

[TheElegantFox]

That is supposed to be a sealed connector.

Ah ok, so I should probably reseal it if the sender is good? It looked non factory or poorly done at some point in its life

 

[Engineer8000]

 

[TheElegantFox]

Ah ok, so I should probably reseal it if the sender is good?

View attachment 2976240View attachment 2976241

Oh, so this is what should be mounting to the cold start switch?

 

[Engineer8000]

That is for a 88 3fe. Your plug looks more like the temp sensor plug.

 

[Engineer8000]

You should hit up @ToyotaMatt to get the correct plug you need.

 

[TheElegantFox]

That is for a 88 3fe. Your plug looks more like the temp sensor plug.

View attachment 2976246

Mine is an ‘88,

You should hit up @ToyotaMatt to get the correct plug you need.

Ok great, I’ll reach out to him.

 

[Engineer8000]

3FE PLUG and PLAY REPAIR KIT Cold Start Injector Thermal Time for EFI Timer Switch SENSOR Sender for Land Cruiser FJ62 FJ80 Pick-up 4Runner Fits 88 -90 FJ62 USA & Canada Spec. sensor sender 91-92 FJ80 89462-20040 - VintageTEqParts.com

NOTE: This DOES NOT Come with the Wires Attached to the connector .... Cold Start Injector Timer Switch SENSOR Sender for...

vintageteqparts.com

 

[ToyotaMatt]

View attachment 2976111Managed to get it off it a deep socket with some light coolant drainage. I think I need to order a new one just because the PO rubber glued the wires with clamp ends to the plug contacts. I took it out and tried to get the gunk out to clean the metal contact area but it’s still pretty sketchy.

View attachment 2976112

- i carry ALL the needed SENSORS on the 3FE Thermostat HOUSING ,

- They ALL Come With Service Repair Connectors / new plugs


- the BVSV comes with OEM New Vacuum line too .......

3FE PLUG and PLAY REPAIR KIT Cold Start Injector Thermal Time for EFI Timer Switch SENSOR Sender for Land Cruiser FJ62 FJ80 Pick-up 4Runner Fits 88 -90 FJ62 USA & Canada Spec. sensor sender 91-92 FJ80 89462-20040 - VintageTEqParts.com

NOTE: This DOES NOT Come with the Wires Attached to the connector .... Cold Start Injector Timer Switch SENSOR Sender for...

vintageteqparts.com

FJ62 3FE PLUG and PLAY Repair KIT OEM Genuine NipponDensso JAPAN , Fuel Pressure Temperature Sensor , SENDER WATER TEMPERATURE Gauge Fits 87 -90 . GREY TIP 1 wire comes with the OEM Connector Plug , Seal and Extra YAZAKI OEM Terminals - VintageTEqP

NOTE: This DOES NOT Come with the Wires Attached to the connector .... Genuine NipponDenso OEM JAPAN Parts Comes with...

vintageteqparts.com

3FE PLUG and PLAY REPAIR KIT OEM Toyota BVSV VSV Valve, Bimetal Vacuum Switching, NO.2 ( FOR E.F.I ) 25820- Fits 88 -90 FJ62 USA & Canada Spec. sensor sender 3FE Vacuum HOSE TOO ! FJ80 also - VintageTEqParts.com

NOS OEM Toyota Comes w/ a nice long section of OEM toyota Factory Vacuum hose also ! Valve, Bi-metal Vacuum...

vintageteqparts.com

Genuine NipponDenso / DENSO OEM JAPAN Gage Assy, Water Temperature Sender Sensor 2/76 - 92 FJ40 FJ55 FJ60 FJ70 BJ40 BJ41 FJ80 FJ62 Comes with OEM YAZAKI Repair Connector KIT & Special positive grip locking detent ball terminals 83420-20020 - Vint

PLUG and PLAY Repair KIT Genuine NipponDenso Japan Gage Assy, Water Temperature Sender 83420-20020 THIS IS : Gauge IN DASH SENSOR...

vintageteqparts.com

OEM GENUINE NipponDenso / DENSO 3FE PLUG and PLAY Repair KIT OE Sensor, sender Water Temperature (For E.F.I.) 89422-20010 Fits 88 -92 FJ62 FJ80 USA & Canada Spec. - VintageTEqParts.com

NOTE: This DOES NOT Come with the Wires Attached to the connector .... - OEM GENUINE NipponDenso / DENSO - DOES...

vintageteqparts.com

 

[ToyotaMatt]

 

[ToyotaMatt]

OEM GENUINE NipponDenso / DENSO 3FE PLUG and PLAY Repair KIT Sensor, Sender Water Temperature (For E.F.I.) Comes With Repair Connector Seals & Extra Terminals Fits 85 - 7/88 FJ62 USA & Canada Spec. & 3B, 3FE 3B, 3FE; BJ70LV-MNK BJ70LV - Vintag

- OEM Genuine NipponDenso / DENSO - DOES come with OEM Copper crush ring gasket - DOES Comes with OEM Repair...

vintageteqparts.com

 

[TheElegantFox]

So I’ll need a new female plug end for both the coolant temp sender and the cold start switch?

 

[TheElegantFox]

Ordered this to start: 3FE PLUG and PLAY REPAIR KIT Cold Start Injector Thermal Time for EFI Timer Switch SENSOR Sender for Land Cruiser FJ62 FJ80 Pick-up 4Runner Fits 88 -90 FJ62 USA & Canada Spec. sensor sender 91-92 FJ80 89462-20040 - VintageTEqParts.com - https://vintageteqparts.com/collections/electrical/products/copy-of-3fe-plug-and-play-repair-kit-oem-toyota-valve-bimetal-vacuum-switching-no-2-for-e-f-i-25820-fits-88-90-fj62-usa-canada-spec-sensor-sender-3fe-vacuum-hose-too-fj80-also

 

[TheElegantFox]

Replaced the cold start temp switch and the female plug end with the kit. Didn’t rewire the ends yet, will see if this does the trick.

 

[TheElegantFox]

Cold start this morning seemed improved but did still take 5 cranked to keep the engine firing on its own.

I think the coolant temp sensor might be the next one to hit with a kit.

 

[TheElegantFox]

After a day or two of wrestling with accessing the old coolant temp sensor, I finally got it off and put on the new OEM one. It looks like the PO did some dodgy work with non-OEM parts and untidy wire ends.The demon in this engine definitely turned out to be a faulty coolant temp sensor so any future forum treaders be sure to checks yours.

After all that it’s starting first time, no CEL, and a steady 800rpm idle as it should have. Still need to try a sub-40f morning cold start but we probably won’t get one of those soon in the South, here’s to hoping it’s done.

 

[Michael Hanson]

Personally I think these sensors go bad due to the wiring ends going bad and either giving intermittent reading or grounding out. In 30 years of owning these trucks I have had very few of these go bad if the wiring is kept up. Our wiring is getting brittle almost all wiring ends should be replaced with new wire . Marine wire has worked for me.

 

[TheElegantFox]

Personally I think these sensors go bad due to the wiring ends going bad and either giving intermittent reading or grounding out. In 30 years of owning these trucks I have had very few of these go bad if the wiring is kept up. Our wiring is getting brittle almost all wiring ends should be replaced with new wire . Marine wire has worked for me.

I definitely think the wiring was the prime suspect in my issue, that being said the non-oem coolant sensor I pulled out ended up being nearly half the size of the OEM one I installed (needed new ones anyway since the non-oem didn't fit the new female plug ends). I have a feeling it was never reading as well as the OEM one since it probably was several MM off of the original spec in reach into the housing. I could be wrong though, these wiring ends I saw from the PO were about the worst I've ever seen.