Wait to start light takes a long time to go out - Chevy and GMC Duramax Diesel Forum
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post #1 of 11 (permalink) Old 01-19-2020, 02:15 AM Thread Starter
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Wait to start light takes a long time to go out

Hey guys, I’m new to owning a diesel and have always heard you turn the key to the on position and wait a few seconds for glow plugs to heat up before you start one. I have an 07 GMC 2500 and the wait to start light takes quite a while to go out. I’m talking. 30+ seconds now that it’s cold and even took 15-20 seconds when it was warm out. Does this indicate new glow plugs are needed? The guy I bought it off of I’m pretty sure replaced them within the past few years. Thanks!
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post #2 of 11 (permalink) Old 01-19-2020, 03:51 AM
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Old skool Diesels....There is no wait to start, just fire it up. The GPs will continue to heat after startup, until temps get where they like it. You'll see your volt gauge rise up to normal when they're off.

When you start losing GPs, you'll get hard codes thrown (SES).
Note; a Dmax doesn't need GPs to start, they'll fire up with 'em failing.
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Last edited by Hook'em_Horns!; 01-19-2020 at 03:54 AM.
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post #3 of 11 (permalink) Old 01-19-2020, 06:27 AM
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Thanks Hook'em, I didn't know that. I always wait for the GP light to go out. Although it only takes a few seconds. Even in the present -40*.

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post #4 of 11 (permalink) Old 01-19-2020, 11:42 AM
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When I'm starting my truck, I put in the key, turn to on, then put in my seat belt, and then turn to start/crank. Works like a charm.

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post #5 of 11 (permalink) Old 01-19-2020, 01:24 PM Thread Starter
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Originally Posted by Ron Nielson View Post
When I'm starting my truck, I put in the key, turn to on, then put in my seat belt, and then turn to start/crank. Works like a charm.
Does your light turn out by the time you do that? With my light staying on for so long I’m worried I’m putting added wear and tear on the plugs, but figured I shouldn’t start it before that light goes out as well. I might start just giving it 5 seconds or so then start it
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post #6 of 11 (permalink) Old 01-19-2020, 01:28 PM
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In the history of people posting about failed GPs, many times it's after a battery event (failing batts, jump to start, etc.) that one here and one there start to fail. They don't seem to like low amp delivery.

So unless you know both are up to par, testing them with long waits, might not be a prudent idea.

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post #7 of 11 (permalink) Old 01-19-2020, 04:00 PM
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How old are your batteries? How many miles on your truck?

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post #8 of 11 (permalink) Old 01-19-2020, 05:51 PM Thread Starter
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How old are your batteries? How many miles on your truck?
Batteries are maybe a year to year and a half old. Truck just hit 100k
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post #9 of 11 (permalink) Old 01-20-2020, 02:38 AM
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Quote:
Originally Posted by Ross07lbz View Post
Hey guys, Iím new to owning a diesel and have always heard you turn the key to the on position and wait a few seconds for glow plugs to heat up before you start one. I have an 07 GMC 2500 and the wait to start light takes quite a while to go out. Iím talking. 30+ seconds now that itís cold and even took 15-20 seconds when it was warm out. Does this indicate new glow plugs are needed? The guy I bought it off of Iím pretty sure replaced them within the past few years. Thanks!
30 seconds is way to long, my 04 & 07 never took longer than 5 seconds even in -30, with the block heater plugged in. And as far as not needing glow plugs, maybe not in Texas, but in -40 Alberta they are required.

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post #10 of 11 (permalink) Old 01-20-2020, 04:56 AM
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Originally Posted by rockn69 View Post
30 seconds is way to long, my 04 & 07 never took longer than 5 seconds even in -30, with the block heater plugged in. And as far as not needing glow plugs, maybe not in Texas, but in -40 Alberta they are required.
Thank Goodness I don't live where it gets that cold any more

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