Cold start problem

Tiny
FIREBIRDCAMARO
  • MEMBER
  • GMC JIMMY
I have a 1994 Jimmy 4.3, 180,000 miles, with CPI. The truck will not start when the motor is cold regardless of ambient air temp. Usually when the truck sits over night. Turns over fine and battery and charging system work fine. It will only start with a shot of ether and once running the truck runs great. I have recently replaced the CPI injector. Replaced fuel pump about 10,000 miles ago. Also fuel pressure is fine at power on and while running, about 60 psi. The wires, plugs, cap, and rotor are new. The coil is about two years old and test resitance and checked for arc on a humid morning, and coil seems fine. Also the o2 sensor and engine coolant sensor are new. The plugs show no signs of lean fuel while running or excess fuel at start up. Plugs look very clean. Also I have checked for vaccum leaks and found none. Also I checked voltage to all sensors on the motor and found all were receiving 5.0 volts. Also checked all senors for resistance and all were with in the correct range. As far as I know I have covered all bases but if I am missing something please help!
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Thursday, October 18th, 2007 AT 11:34 PM

6 Replies

Tiny
RASMATAZ
  • MEMBER
Normally a no cold start is fuel related or temperature sensor problems.

I would check out these guides to help us get started.

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

and

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Please let us know what happens.

Cheers
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Friday, October 19th, 2007 AT 12:03 AM
Tiny
FIREBIRDCAMARO
  • MEMBER
Spark is good at coil and plugs and the igniton module is working fine. When I turn the key on fuel pump always runs and I always let it run before turning the engine over. When tring to start the engine cold it will randomly fire on a cylinder or two but wont start without ether. I check for a fuel pump relay but found no relay just a fuse. Also the oil sending unit seems to work fine when the enigne is running.
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Friday, October 19th, 2007 AT 12:46 PM
Tiny
EDICION DE VENTAS
  • MEMBER
FIREBIRDCAMARO, Do you fix your problem? I have the same issue of Jimmy 4.3 cold start problem, I have the same Jimmy 1994 with over 250,000, works good except for the issue of cold start problem,
Now I can start the engine after 6 or 7 trials, after that is totally warm then works and start correctly at the 1st ignition.

So the issue is cold start problem, even spark, cables, rotor, CPI, fuel pump are new.

What do you find to solve your issue?

Regards
-Eloy
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Friday, October 6th, 2017 AT 11:55 PM
Tiny
KEN
  • ADMIN
The answer above has been updated. It sounds like you have a engine coolant temperature sensor that is going out.

Here is a video

https://youtu.be/g4wRRxgjp94

Please let us know what happens so it will help others.

Cheers, Ken

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Monday, October 9th, 2017 AT 12:16 PM
Tiny
EDICION DE VENTAS
  • MEMBER
Thanks, yes It was the coolant temperature sensor, now start up correctly.
Thanks Ken. Grateful help
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Monday, October 9th, 2017 AT 3:03 PM
Tiny
KEN
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Tuesday, October 10th, 2017 AT 10:54 AM

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