Ballen

1990 4 runner
new fuel filter, timeing belt ,waterpump,radiator,starter,front oil seal and crank gear ,cap and rotor ,altinator,TPS and o2 sensor

how do i tell if cold start injector is bad or stuck on where is it ,and would it cause it to boog when accelerating. smells like it is running rich .

please help i am about to strip off new parts and junk it

ddv1126

Pull it out and have someone. Turn the key. It should shoot gas.

Ballen

Where is it.? Just because gas comes out means its good.but if it is the. COld start injector shouldn't. It only pump fuel when cold.like the name says cold start injecor!. And if it is pumping fuel after warmed up it would be getting to much fuel. So if it pumps after warmed up then is the part that sends the single to it bad

a51young

http://web.archive.org/web/200807310...es/repair.html

depending on 22re or 3.0, look for the cold start injector stuff, there looks like there is some stuff on the switch for it, and inspection and stuff...

Ballen

3.0 3vze could ya be a little more clear.where is it located
Keep in mind it has a throttle body not multi port fuel injection.so i am not even sure it has a cold start injector..

a51young

It does, it is on the passenger side of the plenum, mid to mid rear on the upper side. There is a cable with wires in it running to a rectangular plug with a metal clip, 2 bolts hold it in place.

Click on the link, press ctrl+f and type 'cold' into the search bar, there should be 4 marks, open the two for the 3.0 and read what it says.

Ballen

Much more helpfully then your last post..
Thank you very much
.

scope103

The CSI is only on when the engine is CRANKING, not just with the key turned. But as you noted, you're only worried about whether it is stuck on all the time. So pull the injector out with the fuel line attached. Jumper FP to B+ to run the fuel pump to pressurize the rail. If no gas comes out, the CSI is not your problem. (Remember that's gasoline we're talking about; be careful.)

Ballen

thanks very much A51young and scope 103 gona try to check tomarrow or sat.probabbley sat . find out if i get my job tomarrow .goin on 2 yrs no work

ocfatman

Sorry, I'm a bit confused. Your post says "if no gas comes out, the CSI is "NOT" your problem"....is that correct?
I'm having issues with my cold start. I think.
No fuel sprays but also the line stays dry (no fuel in line to CSI)

AKHeathen

the fuel should never cut to the csi. it is purely electrically atualted. you can unplug it and it should spray no fuel, but it should be spraying plugged in on a cold engine. the switch shuts it off in the coolant manifold once it gets warm.

scope103

Not quite. It's a cold START injector, it is only on while the engine is cranking. If it's not cold, the CSI timer keeps it from actuating at all. If you have a very long crank time, the CSI TIMER shuts off the injector after a very short time (even though the key is to STArt) to prevent flooding.

But there is never a time that the injector is shut off "once it gets warm."

And yes, the "line" to the CSI is connected directly to the fuel rail, so it is pressurized as soon as you turn the key to start (and for vehicles working correctly, it will stay pressurized for quite some time after the truck is shut off.)

AKHeathen

the csi timer is as simple as the fuel pump circuit poening relay. there is 0 logic circuits in either. they are simple relays. the csi timer operates solely on measured coolant temperature via thermister. the csi power comes from the efi ecm, which is informed when the csi timer De-energizes. to change the fuel map.

kcaudill

Geeezzz buddy,

Here is all the info you need. Click the link and have fun.
Shows how to test, remove, and install.

http://personal.utulsa.edu/~nathan-b...88coldstar.pdf