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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 06-07-2008, 03:10 PM   #1 (permalink)
Theront
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extended glows

I just installed a toggle on the yellow wire for the ect and put a resistor in series on one position of the switch and on the other position the computer still sees the actual..


Boy what a difference in the way the truck starts!! It starts almost instantly now. I have a question though. When I connect the resistor in the circuit via the toggle switch my glow plug lights stays on for about 13 seconds. This is 2-3 seconds longer than without it. However the truck starts so nice with very little smoke.

My thinking is this, the switch is advancing the timing by fooling the computer into colder weather. Does this possibly meand that my timing might be retarded? I am unsure of how to check the timing, I am still reading everyday.

My next switch, here in the next day or so is for the TCC mod. My trans temps climb until I hit 55-60mph.


Thanks
Theront

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Old 06-07-2008, 03:38 PM   #2 (permalink)
jifaire
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Glad you got 'er done!

But...



If I recall correctly, this is one mod that isn't in the FAQ... and should be.

(hint, hint)...

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Old 06-07-2008, 05:36 PM   #3 (permalink)
jbsaxman
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x2, I have been thinking about this as I have been working in my truck. Good call, Theront
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Old 06-07-2008, 05:39 PM   #4 (permalink)
Theront
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I will try for some pictures, basically I love this switch right now. Even in the morning I bet it turns over maybe 2 revolutions before it is running and then it has an idle around 950rpms or so and it is so smooth.


Theront
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Old 06-07-2008, 06:23 PM   #5 (permalink)
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Nice!! Thanks, Theront!!
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Old 06-07-2008, 09:10 PM   #6 (permalink)
Theront
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Here are a couple of pictures of the finished install. We are in the middle of trying to move and getting rained on everytime we try to load the trailer. I can write up more and document it better if someone were to remind me at a later date.

Basic supplies:
SPDT switch
Resistor I had 5.56k ohm
wire to reach ECT sensor

Instructions:
solder resistor between pins A and C on the switch
solder yellow wire to sensor on B
solder yellow wire to ECM on A also

What you will have done is to put the switch in series with the yellow wire from the sensor. In position A the the computer sees the sensor normally. In position C the computer sees the sensor + resistor.




Theront
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Old 06-07-2008, 10:03 PM   #7 (permalink)
jifaire
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Thanks, Theront! Your mod is now in the FAQs under 'Getting more Glow Plug duration' and in the alphabetical section under 'ECT 'Fooling' for better cold starts'.
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Old 06-08-2008, 01:07 AM   #8 (permalink)
jbsaxman
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Looks fantastic, Theront! Thanks a bunch. This is definitely a mod I will be doing shortly.
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Old 06-08-2008, 08:38 AM   #9 (permalink)
Dave001
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Hi Theront, thanks for the pics and info. Question - do you toggle the switch on, then turn your key, or do you do it after turning the key on? Is it a spring loaded momentary switch or does it stay on, then you have to turn it off after the engine starts?

Sorry for the silly questions, I'm just not sure how it works.
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Old 06-08-2008, 08:49 AM   #10 (permalink)
Theront
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I toggle the switch to the up position, turn the key, wait for the glow plug light to go off then start the vehicle. I sometimes leave the switch up for a brief amount of time. I think that the colder it gets the longer I can leave the switch up. It moves my idle up to approx 950rpms.

Hope it helps.
Theront

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