Why Wait To Start?
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5th Wheeling
Joined: Aug 2003
Posts: 37
Likes: 1
Why Wait To Start?
I read that the glow plugs are not called for below a certain engine temperature (I don't recall the exact number, 55-60 I think it was). So if the engine is above the need for glow plugs, Is there something else, worthwhile, we are waiting for?
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
It really won't hurt anything except maybe forming a bad habit as long as your oil temp is above 55 deg C (131 deg F) unless you're at altitude or some other factor is causing the GPR to activate.
You could test GPR output to verify the conditions you think are good, or just do the GPR LED mod so you know when the glow plugs are activated.
This time of year, I'd wait a few seconds to be on the safe side.
You could test GPR output to verify the conditions you think are good, or just do the GPR LED mod so you know when the glow plugs are activated.
This time of year, I'd wait a few seconds to be on the safe side.
Senior User
Joined: Dec 2003
Posts: 331
Likes: 1
From: fl
I have NEVER waited to start. I now have over 325,000 on original glow plugs and relay.
Also never a starting issue. Turn key & it starts.
BTW although FL is in my sig truck has only been here 100,000 mi of its' life.
Also never a starting issue. Turn key & it starts.
BTW although FL is in my sig truck has only been here 100,000 mi of its' life.
Post Fiend
Joined: Apr 2007
Posts: 7,241
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From: Powder Springs, East TN
Basically it is a dummy light for people that don't know diesels so that way it can warm a bit. IT is true in the summer months it pops right off. But when it was 18 degrees here the other day me and Cory hooked up AE and the GPR stayed on a full 2 minutes.
Lead Driver
Joined: Jan 2006
Posts: 6,267
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As long as water isnt freezing in puddles, the truck will usually start without glow plugs.
Keep in mind that just because it starts, doesnt mean it starts as easy as it could if you gave the glow plugs a chance.
Right now my parking spot has 12" of snow, and believe me, I give her the glow plugs every time even when plugged in.
Keep in mind that just because it starts, doesnt mean it starts as easy as it could if you gave the glow plugs a chance.
Right now my parking spot has 12" of snow, and believe me, I give her the glow plugs every time even when plugged in.
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5th Wheeling
Joined: Aug 2003
Posts: 37
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I did the GPR LED mod, that is how i noticed that the WTS was on and the glow plugs were not. What I am wondering is if there is something besides the glow plugs that the PSM is waiting for. Is it waiting for vacuum or fuel pressure to build up?
Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
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Posting Guru
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From: East Peoria, IL
exactly...I only give mine a few seconds in the cold.
Put it this way, Cat doesn't use glow plugs in any of their engines (minus some small stuff in lawn and garden). As a mechanic for Cat, I got to do some work in the "cold room" at a temperature of -45*F. Needless to say that kitty fired right up
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Senior User
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exactly...I only give mine a few seconds in the cold.
Put it this way, Cat doesn't use glow plugs in any of their engines (minus some small stuff in lawn and garden). As a mechanic for Cat, I got to do some work in the "cold room" at a temperature of -45*F. Needless to say that kitty fired right up
Put it this way, Cat doesn't use glow plugs in any of their engines (minus some small stuff in lawn and garden). As a mechanic for Cat, I got to do some work in the "cold room" at a temperature of -45*F. Needless to say that kitty fired right up
Post Fiend
Joined: Jun 2006
Posts: 9,714
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From: White Mnt's,New Hampshire
exactly...I only give mine a few seconds in the cold.
Put it this way, Cat doesn't use glow plugs in any of their engines (minus some small stuff in lawn and garden). As a mechanic for Cat, I got to do some work in the "cold room" at a temperature of -45*F. Needless to say that kitty fired right up
Put it this way, Cat doesn't use glow plugs in any of their engines (minus some small stuff in lawn and garden). As a mechanic for Cat, I got to do some work in the "cold room" at a temperature of -45*F. Needless to say that kitty fired right up
Posting Guru
Joined: Jul 2007
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From: SE Wisco
The motor in my post machine did and I believe that was a Cat. There was a BIG sticker by the intake that said do not use starting fluid due to grid heater.
Hotshot
Joined: Nov 2006
Posts: 11,288
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From: North of Greenville
What is more important is to let the engine run for a couple of minutes before taking off to ensure that the oil has become fully circulated through your turbo components (if it's a cold one or hasen't run for several hours or so). The time required for complete circulation when cold is noticeably less for those running 5w40 synthetics because they flow more easily when cold.
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