Calling all Canadians!!!! (Q for the chosen/frozen)
12-07-2005 | 03:21 PM
#16
Registered User
Joined: Feb 2004
Posts: 1,147
Likes: 0
Originally Posted by staarma
The 3 cylinder cut is a program that only fires 3 cylinders to load the engine to decrease the warmup period.
I believe my truck has this program. I left my truck outside all day yesterday at work in about -4 F and when I went to start it it ran on what seemed to me like 3 cylinders with a lot of white smoke and higher than usual EGT's (400 +). It idled like that for about 3-4 minutes and then it fired all cylinders and went to 1000 RPM like usual and smooth as can be. I have never had this happen but I usually plug it in. This morning it was -22 F here and it was plugged in and slow turning over but it fired right up and went to 1000 RPM immediatley which has never happened before either. Usually it takes about a minute for it to go to high idle.
I think there is a lot to these trucks we don't know about. They seem to have a lot of "self preservation" built in as I'm finding out about over the last few colder days. I wonder what it's going to do when it gets cold outside like -40.
I believe my truck has this program. I left my truck outside all day yesterday at work in about -4 F and when I went to start it it ran on what seemed to me like 3 cylinders with a lot of white smoke and higher than usual EGT's (400 +). It idled like that for about 3-4 minutes and then it fired all cylinders and went to 1000 RPM like usual and smooth as can be. I have never had this happen but I usually plug it in. This morning it was -22 F here and it was plugged in and slow turning over but it fired right up and went to 1000 RPM immediatley which has never happened before either. Usually it takes about a minute for it to go to high idle.
I think there is a lot to these trucks we don't know about. They seem to have a lot of "self preservation" built in as I'm finding out about over the last few colder days. I wonder what it's going to do when it gets cold outside like -40.
There is no 3 cylinder idle algorithm enabled in the ECM. Hopefully Scotty can find some documentation, but I don't think its there.
in temperatures less than 20F, the idle should go directly to 1000rpm.
If you let the truck idle too long, it will also go to 1000rpm
I would think its not very good to idle like that (hopefully it was on 3 cylinders, I know the engine can sustain itself on 2, but it ain't pretty) for 3-4 minutes. Especially if the cylinder walls that are not firing are being washed by fuel on each intake stroke. With the true 3-cyl idle, the cylinders are cut by not putting fuel into the cylinder so the cylinder walls are still lubricated. If it does that again for you, I'd give it a little bit of the go pedal until she clears out.
12-07-2005 | 05:52 PM
#17
Registered User
Joined: Jul 2005
Posts: 2,953
Likes: 0
From: Belgrade, Montana
Well, that's just it. The truck will rev on its own and has to about 1500 RPM max and then back down to 1000. Once it stabilizes, it sits at 1000 but yesterday it was like it was running on 3 cyl. It sounded completley different as well. I have no idea what is going on and hope I didn't come across like I did. Just trying to throw some ideas around to find out what all of the white smoke and rough idle is about and trying to pattern the symptoms. I don't buy the "bad injector" routine that seems to get thrown into the mix all of the time. I'm interested to see how my truck will react today as it is about -20 right now and I'm about to go out and start it.
12-07-2005 | 07:51 PM
#18
Top's Younger Twin
Joined: Nov 2001
Posts: 3,743
Likes: 21
From: Thanks Don M!
Originally Posted by bigblock2stroke
As the song goes, you believe what you want to believe.
There is no 3 cylinder idle algorithm enabled in the ECM. Hopefully Scotty can find some documentation, but I don't think its there.
in temperatures less than 20F, the idle should go directly to 1000rpm.
If you let the truck idle too long, it will also go to 1000rpm
I would think its not very good to idle like that (hopefully it was on 3 cylinders, I know the engine can sustain itself on 2, but it ain't pretty) for 3-4 minutes. Especially if the cylinder walls that are not firing are being washed by fuel on each intake stroke. With the true 3-cyl idle, the cylinders are cut by not putting fuel into the cylinder so the cylinder walls are still lubricated. If it does that again for you, I'd give it a little bit of the go pedal until she clears out.
There is no 3 cylinder idle algorithm enabled in the ECM. Hopefully Scotty can find some documentation, but I don't think its there.
in temperatures less than 20F, the idle should go directly to 1000rpm.
If you let the truck idle too long, it will also go to 1000rpm
I would think its not very good to idle like that (hopefully it was on 3 cylinders, I know the engine can sustain itself on 2, but it ain't pretty) for 3-4 minutes. Especially if the cylinder walls that are not firing are being washed by fuel on each intake stroke. With the true 3-cyl idle, the cylinders are cut by not putting fuel into the cylinder so the cylinder walls are still lubricated. If it does that again for you, I'd give it a little bit of the go pedal until she clears out.
I am going to bring the owners manual in tonite. I do not have the nads to unplug it to test as my wife is expecting a baby and do not need to add any excitement in case we need to leave sooner then later.
Scotty
12-07-2005 | 08:21 PM
#19
Top's Younger Twin
Joined: Nov 2001
Posts: 3,743
Likes: 21
From: Thanks Don M!
Nothing in the 04 manual.
I guess it liked to idle rough but sequential or something like that...it was not erratic but it sure was sounding like it was running on 3 cyls...learned more again today.
Scotty
I guess it liked to idle rough but sequential or something like that...it was not erratic but it sure was sounding like it was running on 3 cyls...learned more again today.
Scotty
12-07-2005 | 08:22 PM
#20
Registered User
Joined: Jan 2004
Posts: 1,075
Likes: 0
Mine goes to high idle at 0 celsius(32 F) or less. Sometimes it goes to 1000rpm right away, and sometimes it takes a minute or so. it will not go instantly to high idle just because it is much colder. My brother runs 0-40 esso which we buy at a local bulk station, and I use Delo 5-40. We pay the same price, unless I get mine when it's on "special". Light, synthetic oil makes a definate difference. I do not plug in until 4below F(-20C). However my truck is parked in the garage overnight 99% of the time. If it is outside overnight at-4F it starts perfectly in the morning, with no white smoke. I warm it up for 5-10 minutes, and drive it gently until the temp guage comes up a bit. 
12-08-2005 | 10:37 AM
#21
Registered User
Joined: Jul 2005
Posts: 2,953
Likes: 0
From: Belgrade, Montana
This morning I started the truck at -26 F and it started right up without white smoke and no rough idle, go figure. By the time I got out and started back inside, it raised the idle to 1000 and stayed there until I came out 5 minutes later. Don't know what to think now. It was colder this morning than at work the other day and yesterday morning but the trcuk labored much more when it wasn't as cold out. It doesn't make sense to me. I have my cord on a timer that is set the same for all days in the week except for the weekends I have it set to stay on until 10:00 AM instead of off at 8:30 AM.
I did learn a couple things though. It turns out that my XM display and my Attitude diplay won't display anything under -20 F for a while and then eventually they start to fade in very slowly and quite crude at first.
I did learn a couple things though. It turns out that my XM display and my Attitude diplay won't display anything under -20 F for a while and then eventually they start to fade in very slowly and quite crude at first.
12-08-2005 | 11:24 AM
#22
Registered User
Joined: Feb 2004
Posts: 530
Likes: 0
From: Southeast WI
There isn't a 3-cylinder mode on the CR engines, I'm pretty sure. My 03/6-speed shoots up to 1000 rpm at 32 degrees upon cold start (unplugged).
It has been -4F and -6F in the morning here the past few days and I haven't had it plugged in and it even sits outside. It starts right up every time. It doesn't turn over too fast but it always pops right off. Sometimes it's a little surgy but it gets over that after I've moved about 1000 feet.
The manual says that you don't need to plug it in until 0F with 15W-40 or -20F with 5W-40, FYI. I don't have the luxury of plugging in when I go to work.
Andy
It has been -4F and -6F in the morning here the past few days and I haven't had it plugged in and it even sits outside. It starts right up every time. It doesn't turn over too fast but it always pops right off. Sometimes it's a little surgy but it gets over that after I've moved about 1000 feet.
The manual says that you don't need to plug it in until 0F with 15W-40 or -20F with 5W-40, FYI. I don't have the luxury of plugging in when I go to work.
Andy
Thread
Thread Starter
Forum
Replies
Last Post
Elohim1
1st Gen. Ram - All Topics
14
04-06-2010 12:42 PM
Shovelhead
Other
5
02-02-2008 12:39 PM
DodgeDemon
3rd Gen High Performance and Accessories (5.9L Only)
4
06-30-2007 01:44 PM
97CTD
Performance and Accessories 2nd gen only
8
02-24-2003 05:00 PM