Good day! I've posted on hard to start issue when cold, but have not gotten enough response to help me
with the cold start. Mine is a 1990 22re, an I'm having issues when starting it for the first time in the day, or
after it's been sitting for a while after being started an have been sitting for some time.
Iv'e done some tests using my multimeter and my findings were these.
At the cold start injector I am getting between 3.2-3.5
At the cold start switch bet Sta-Stj below 10 c (50 f)
i am getting between 41.6 an 42.1 ohms.
And above 20 c (68 f) I am getting between 81.1 and
81.4 ohms.
Between Sta - Ground i am getting between 0.4 and 1.4 can someone share with me some knowledge so i
can get on the right track. Thanks for the help.

 

All your readings are within spec, except for STA-GND.

More here.

Also critical is that body of CSI timer switch is making good electrical contact with engine block. So if it's scaled, you need to clean that, too. You'd want shiny, bare metal.




I also cleaned the temp-sensing vacuum switching valve. It may also have something to do with cold start or idle control. Haven't researched that yet.





Please keep us posted.

 

I have cleaned all three as suggested, so I'll see.
I do have a question about Sta- ground. When it comes to the ground, having being grounded right
beneath Sta is ok? Thanks again.

 

Sorry, question is unclear.
But there shud always be some resistance between STA and GND because there's a heating element there.

 

What I meant was i had it grounded right beneath Sta.

 

Please read my post on "more" link above.

 

I have read "more" understanding how the CSI timer
switch works. I did another test on the Sta an Ground
at 80 deg and got a tatally diff reading from the previous 1.4 1.5
I am now getting 161.4 162.0.what are your views?
should I replace the CSI timer switch. Thanks much.

 

Different model-years have varying specs for those readings so please look for specs for your particular year model. However, most STA-GND only range to around 90 ohms, so those new readings are off-spec and fluctuating too much, which suggests either the coil is shorting or opening - meaning your CSI timer switch is bad.
Also please double-check your test points. If you have verified above, then your CSI timer switch is definitely bad. Too bad, they're a bit pricey.

 

Rad 4, I appreciate your time an patience greatly thanks for your Knowledge.

 

I have worked on several trucks and the only issue I have ever had was the Cold Start Timing Switch which is what you are checking now. That sensor is the one that tends to fail. Never had any problems with the cold start injector.

 

guys I appreciate the guidance.After running the tests on the injector cold start switch, I've decided I'm going to change it. Before I do that their is one thing I've also noticed, which is, if I was to start it an let it sit for about 20 min or an hour, an restart it, it would have to swing twice
before starting up, dispite me giving it gas. and when it do start, it would take the same amount of time as it would the first
time. Does that mean anything? Any help would be greatly appreciated. As you guys know this piece is
somewhat pricey. Thanks

 

Diego,
If you do not want to spend for a new CSI timer switch, please do as I suggested above.
Did you measure STJ to Ground (brass housing)? This is the most critical spec that Toyota failed to include in the FSM.
Did you clean the thread here as suggested above? THIS IS VERY IMPORTANT. EVEN IF THE CSITS TESTS GOOD OFF THE ENGINE, IT WILL NOT WORK IF IT IS NOT PROPERLY GROUNDED. This is how the CSITS gets grounded. Use battery terminal cleaner.




Above is explained here:

 

Well guys, I have swapped the cold start injector. As in my thread, I have been having hard start issues. toy was swinging once twice too many times before starting. and have been starting just fine since I switched out the injector . Thanks for the help guys.