Glow Plug And Turbo Delays

rlapporte · August 17, 2008

Hi. I'm new to this forum, and I just bought my first diesel truck...an '07 Silverado 2500 HD. I am getting a remote start that has options to delay the start for a variable amount of time to allow the glow plugs to heat up. Currently it's 80 degrees where I live, so I have no way of knowing how much time I will need in the dead of winter to allow the plugs to warm. From what I understand the newer trucks don't need much time, but I don't know if that means I should set the delay for 3 seconds or 60. Does anyone know how long it takes the plugs to warm up on this vehicle when it's below zero outside?

Also, does anyone have any suggestions as to how long I should allow the car to keep running to cool down the turbo before killing it? This delay is also an option on the remote start. Thanks in advance.

minibike132 · August 17, 2008

Hi. I'm new to this forum, and I just bought my first diesel truck...an '07 Silverado 2500 HD. I am getting a remote start that has options to delay the start for a variable amount of time to allow the glow plugs to heat up. Currently it's 80 degrees where I live, so I have no way of knowing how much time I will need in the dead of winter to allow the plugs to warm. From what I understand the newer trucks don't need much time, but I don't know if that means I should set the delay for 3 seconds or 60. Does anyone know how long it takes the plugs to warm up on this vehicle when it's below zero outside?

Also, does anyone have any suggestions as to how long I should allow the car to keep running to cool down the turbo before killing it? This delay is also an option on the remote start. Thanks in advance.

For the first part 3 seconds should be long enough for the second part I don't know I'd have to do some looking.

It looks like your second question is a two parter am I right. You want to know how long to idle after driving so you don't harm the turbo and what kind of delay on startup. Tell me If that's not right. If you want a guess I don't think you'll have a problem shutting down right away unless your beating the crap out of it and I'm pretty sure the vanes are open during startup to aid in warm up time so I would guess no delay on the startup. It's been a while since the latest diesel class though so I'd have to look that up.

And welcome to the site!!!

rlapporte · August 17, 2008

Thanks for the quick reply! Yes, the question is a two-parter. I'm slightly confused by your answer though. Do you feel that I should put in a delay for 3 seconds as you suggested initially, or do you think no delay on startup as you mentioned later?

minibike132 · August 19, 2008

Also, does anyone have any suggestions as to how long I should allow the car to keep running to cool down the turbo before killing it? This delay is also an option on the remote start. Thanks in advance.

I was under the impression that this part meant that there were seperate delay options for both the start up time to let the glow plugs get hot and another setting for turbo engage delay.

I would say 3 seconds is enough for the glow plugs but no delay should be set for turbo engagement if you meant that both were options.

rlapporte · August 19, 2008

I see what you meant. Yes, there are two separate options...one to delay for the glow plugs warming up and one for the turbo to cool off.

That's fantastic if only 3 seconds are needed for warmup even on the coldest days. Thanks.

minibike132 · August 20, 2008

Yea thats pretty cool isn't it. I don't remember when we started with them but they are the new fast heat plugs. They are supposed to reach somewhere around 1000 degrees F in 2 seconds of full on time. Then after that they are pulsed according to what the pcm thinks it might need for heat.

As far as that turbo goes I wouldn't go messing with any settings for that. The vanes are pcm controlled if you go messing with that my guess is your going to get some codes. Plus I can't see any plus to inhibiting turbo operation.

Silverado4x4 · August 28, 2008

When I had my lly Duramax it was around 5 degrees outside and it only took like 4 seconds for the glow plug light to go out before I could start it, there really fast. As far as a cool down timer for the turbo its not needed in todays diesels even if you work the hell out of the motor. Think of it this way if the turbo needed to cool down before motor shutdown then it would be programed in the computer to allow for cool down from the factory and with todays oils its not needed.

Older Diesels's if you shut them down to fast after getting alot of heat in the turbo would coke the bearings with the old tech. oils and you may have heard the term " ya have to let them idle down" not true today. Oil has come a long way since then.