Wondering about the importance of the cold start injector.

I don't care about slightly longer cranking times(I see them as a good thing anyway). Wanting to plug the fuel rail connection, and leave the injector in place as a plug.

Will there be any adverse affects or harm from removing this. I wouldn't care, but the engine is brand new, and I don't want to kill anything by my ignorance.

What exactly is the cold start injector?

I am getting extremely long cold cranking times and maybe this is the reason. (88 V6)

I just recently found out that the previous owner of my car had the cold start injector unplugged. The electrical connector was actually buried in a mass of greasy gunk caused by no o-ring on my distributor--yuck.

I was wondering why I heard people talking about their cars starting on the first or second crank, when mine wouldn't start for 8 to 10 cranks. It really didn't bother me though, just a little more wear on the starter. I will be hooking it back up when I put the engine back together though.

Every V6 I own, I disconnect the Cold Start Injector. A Good running Motor doesnt need it, point in case, My wifes 86 GT has over 140K on it, and it doesnt even spin a complete revolution before starting. VERY rarely do you have to "crank it over".

The reason i do it, is that the 5th and 6th Cylinders (or was it 3rd and 6th.. the 2 cylinders below the injector) get extra gas to start up. Now if your cold start sensor (located right next to the injector) is bad, you get crappy gas mileage, AS well as extra fuel in those cylinders. Thats why most engine failures are failing on those 2 cylinders. The ECM just keeps spittin in fuel thinking the engine is cold.

So on my cars, i unplug the Cold Start, and just let the harness sit nex to the injector. Another plus of this, is that you can remove the sensor, and wire in a Mechanical Water Temp Gauge, without removing the Gauge sensor, as it works with the ECM as well.

Wow.. who knew i knew that?

-Karl

As far as I know, the CSI is only active while the engine is cranking. Once you release the key, the CSI is no longer open. My problem, is mine leaks, flooding the engine. I had my injectors rebuilt last year, and they are still good.

yeah unless you're cranking it shouldn't be injecting gas. If it does it's leaking.

Phil

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GTDude
25 years GM experience

I had thought they did away with that thing on later versions of the V6. They just tweeked the ECM code a bit.

Also, the CS injector is a dumb device. The ECM doesn't control or even know about it. It's controlled by the CS switch that is screwed into the head or block someplace. (At least I remember it reading coolant temp...)

It gets power from a fuse link that hangs off the starter. The CSI circuit is only hot durring cranking, running off the same wire that kicks on the starter solinoid.

I can't find anything right now that says what temperature will cause it to turn on.

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11-Sept-01, The day the world as we knew it ended.

I also want to remove my cold start. I have unplugged it but it leaks. I just had my injectors rebuilt and flow tested and my new 19# injectors are in perfect shape. But using one of Watts fuel rail, fuel pressure guages I can see that the car is bleeding on fuel. Rather quickly, and the car has a real rich smell on start up. I dont care if the cold start is in the block or not, I just dont want it to have a supply of fuel. I was almost tempted to take a pair of vice grips and crush the line. (too afraid that it might crack or leak though)

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David
85GT