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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 10-06-2008, 06:40 PM   #1
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Question cold start sensor

ok.. so my cold start sensor is soo rotted out the connector fell off.. the connector is in good shape still though thankfully

anyways i spent all day driving around(with my now even crappier running truck) annd no one has even heard of this.. would it be best to just get the sensor from toyota? and has anyone ever bought one from them, or know price wise how much they run for?

i need to get it done soon as its cold up here in the great white north and my truck is sooooo hard to start without it.. also making it run like crap(high idle)

so any help would be great
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1991 Toyota 4Runner SR5, Daily Driven Toy
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Negative 25 MPG
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Old 10-06-2008, 06:43 PM   #2
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Originally Posted by ontario4runner View Post
so out of curiosity.. ill be picking up my cold start sensor monday and putting it in.. any words of advice for getting old one out and new one in? its a pretty tight space! haha
What happened to that one?
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1992 Pickup V6, 4x4, 5 speed, SR5, 300,000 miles young, every option except automatic tranny

31x10.5R15 | K&N FIPK | Cherry Bomb | 3" BL | 4 110W KC Light Bar | 6'6" Western Plow | 800W 10" Sony | 850W Sound Storm | 2 4" Obcon | 4 1" Rockford Fosgate Tweeters | 2 High Pass Crossovers | 2 High-Low Pass Crossovers | 2 6.5" Rockford Fosgate | Pioneer 4x50W Head Unit | Mechanical Oil Pressure Gage | Lack of EGR | Blinker Mod

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Old 10-06-2008, 06:44 PM   #3
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Just buy a new sensor from Toyota. The plastic they used in the building of them gets hard and crumbles. Typically it can be had for under $100. If you can still see the part number on the side of the sensor, go to www.toyotapartsales.com and input the number to get an idea of what they run brand new.
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Hmmm, dunno. Ask the oem Nazi DC.
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Old 10-06-2008, 06:48 PM   #4
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What happened to that one?

welll.. i had called the autoparts store i was going to get it from.. as i have an account with them.. and they said they had it.. turns out when i went to get it they thought i was stupid and meant coolant temp sensor and they argued with me saying there is no such thing as a cold start sensor in my 4runner.. i soon shut them up with my handy dandy toyota service manual needless to say.. every parts store i go to says the same thing.. there is no such thing.. even reading threw there lists myself for even alternate naming...
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1991 Toyota 4Runner SR5, Daily Driven Toy
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Old 10-07-2008, 12:52 AM   #5
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Cold Start Injector vs. Injector Timer

The actual temperature sensing of your motor is done by the Injector Timer that sends a signal to the the Cold Start Injector, once up to operating temperature there should be no use of the Cold Start Injector when starting. I had the same issue, cleaned the injector and it worked for a time, but then same cold starting issues would return. I know you're not going to want to hear this but what fixed it for me was a new fuel pump, apparently there's a check valve in the pump, and when your truck sits idle the fuel drains back to the tank, therefore when you start your truck it's like you have to crank it until the fuel comes all the way from the tank. Replaced the fuel pump, not a problem, even after the truck sits for a month (...in Minnesota). Good luck.
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Old 10-20-2008, 06:32 AM   #6
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The actual temperature sensing of your motor is done by the Injector Timer that sends a signal to the the Cold Start Injector, once up to operating temperature there should be no use of the Cold Start Injector when starting. I had the same issue, cleaned the injector and it worked for a time, but then same cold starting issues would return. I know you're not going to want to hear this but what fixed it for me was a new fuel pump, apparently there's a check valve in the pump, and when your truck sits idle the fuel drains back to the tank, therefore when you start your truck it's like you have to crank it until the fuel comes all the way from the tank. Replaced the fuel pump, not a problem, even after the truck sits for a month (...in Minnesota). Good luck.
I got one doing exactly this...was not doing it before in another truck so I am thinking the fuel pump.

So which is cheaper to try...the CSI or timer or a fuel pump?

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Old 10-20-2008, 09:54 AM   #7
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I had to replace the CSI in my old '91 3.0 truck and IIRC it cost me something like $178 from the stealersip
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1991 Toyota 4Runner SR5 4x4, 3.0 V6, Auto <---R.I.P

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1994 4Runner SR5 V6, 3.0 V6 Auto, Sony XPLOD CDX-GT540 UI, 31x10.5's, *4.88's*
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Old 10-20-2008, 09:54 AM
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