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Discussion Starter #1
Car turns over, and starts but chugs a little bit until it gets to idle. It’s fine for the rest of the day. Initial start is rough.

Any ideas??
 

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off the top of my head CSI (cold start injector, resistance across terminals 3-5 ohms) Located on the underside of the intake manifold MK2 TSRM On-Line

Start here:
 
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Discussion Starter #4
Does the cold start injector work at any temperature? An online post mentions it only works below 40 degrees? Another post suggested a timing switch?
 

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looking at that diagram in the first link suggests that it's a timed switch.
 

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...and starts but chugs a little bit until it gets to idle. It’s fine for the rest of the day. Initial start is rough...
Can you elaborate? about how long till it gets to idle?
 

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Discussion Starter #7
It starts to idle smoothly after about a 5-10 seconds. Just VERY rough at the first turn of the key.
 

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My MKIII has nearly the same cold start time switch setup.
I replaced the cold start time switch with a 35C unit and replaced the connector/pins.
Cold starts are smooth and fast now.
Used to have the same stumbling / multiple cranks to start.

Just some ideas.
 
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Good to know. I’ll keep it in mind. I ordered the time switch last night. I want to see if that remedies the situation. Thanks for the info.
 

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My MKIII has nearly the same cold start time switch setup.
I replaced the cold start time switch with a 35C unit and replaced the connector/pins.
Cold starts are smooth and fast now.
Used to have the same stumbling / multiple cranks to start.

Just some ideas.
Not that I need a lower temp CSI time switch, but what vehicle would that have come from? And where did you get the new CSI plug?

Have had same hard start issue.
 

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Most all 1980-1990 Toyotas used these.
Corolla, Supra, MR2, 4Runner, Pickup, ect...
89462-30011 is the 35 C rated one. The one I used.
89462-20060 & 20050 is the 45 C rated.

These TSB's addressed some cold starting issues from the Supra 7M engine and Toyota trucks with the 22R engine.



I've found the aftermarket ones have no listed temperature rating. So I stayed away from those.
 

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@Supradavis
The connector is very easy to locate.
It's called a JPT (junior power timer)
Also the very common EV-1 connector also works.

This is one of my all time favorite places to order connectors.
They will even work with custom requests for specific hard to find connectors.
And add them to their catalog once they are located.
(I've done this multiple times with them already.)
 

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I have the same problem, just that it takes a couple of days.
My logic says that it is the check valve of the fuel pump, see if you have pressure in the rail before a cold start.
(I really look forward to see if your new cold start switch do the trick..)
 

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Pirate nice find on the TSB...

AND 89462-40010 thermal timing switch is used in the RA MA platform as well!!

Per Toyodiy.com



Most all 1980-1990 Toyotas used these.
Corolla, Supra, MR2, 4Runner, Pickup, ect...
89462-30011 is the 35 C rated one. The one I used.
89462-20060 & 20050 is the 45 C rated.

These TSB's addressed some cold starting issues from the Supra 7M engine and Toyota trucks with the 22R engine.



I've found the aftermarket ones have no listed temperature rating. So I stayed away from those.
 

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Discussion Starter #18
I have the same problem, just that it takes a couple of days.
My logic says that it is the check valve of the fuel pump, see if you have pressure in the rail before a cold start.
(I really look forward to see if your new cold start switch do the trick..)
 
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