Jump to content

  • Welcome To Mopar1973Man.Com LLC

    We are a privately owned support forum for the Dodge Ram Cummins Diesels. All information is free to read for everyone. To interact or ask questions you must have a subscription plan to enable all other features beyond reading. Please go over to the Subscription Page and pick out a plan that fits you best. At any time you wish to cancel the subscription please go back over to the Subscription Page and hit the Cancel button and your subscription will be stopped. All subscriptions are auto-renewing. 

Cold weather and timing

ISX
 Share

Recommended Posts

ISX

ISX

Posted
  • Author
Posted (edited)

Yeah I don't understand why things advance to improve starting, obviously doesn't help matters. The 1st gens also advance timing even more during cold starts, 5* more.. The P7100 doesn't do this so I am always at 16 but he would be around 21 which would explain why it won't start. If you could disable that cold timing advance so it would stay at 16 it would probably start. They say it advances timing during cold weather because it gives the fuel a longer time to burn (since its shot in sooner) because it needs it when everything is cold and this prevents smoking yadda yadda, I got the EXACT opposite! My truck starts worse obviously and smokes like a steam engine. That -2f start, it didn't smoke at all, it never did.. The only thing I can think of happening is the fuel is shot in so early that the piston hasn't come up enough to get much heat going and by the time it finally does get enough heat at the top of the stroke, it lights the fuel off the top of the piston giving horrible start characteristics. With the timing retarded, when the fuel finally shoots out of the injector, there is enough heat that it spontaneously ignites like it is supposed to rather than shooting in fuel then trying to light it off the top of the piston. I think having all the fuel on the top of the piston or wherever it lands also cools it off making it even harder to start. If the air is hot from compression and the injector fires then it will ignite before hitting any metal which will steal heat from the fuel making it impossible to light until the air AND piston wall and piston top reach a higher temp. If they think that advanced timing thing works, they need to advance it after the engine has ran for at least 30 seconds, NOT when it is trying to start! This is the only reason I can come up with for it not starting worth a damn. They say this is the electric cold start timing advance thing so you might unplug it and see what happens. I would think it would have a spring in there to keep it from advancing when unplugged. http://contrails.free.fr/images/Diesel/dsc05348.jpg Hmm, and a pic of one without the cold start thing. http://contrails.free.fr/images/Diesel/dsc05415.jpg

Edited by ISX
Link to comment
Share on other sites
ISX

ISX

Posted
  • Author
Posted (edited)

Sureeeee, make me go out and test the voltage why don't you!Alright the grids aren't even turning on. Woulda thought after 4 hours of sitting in 32* it would turn them on but whatever floats it boat. I'll check it in the morning. What is your voltage when they're on and the truck is off?

Edited by ISX
Link to comment
Share on other sites
  • Owner
Mopar1973Man

Mopar1973Man

Posted
  • Owner
Posted

Well crap... My truck has been sitting for 4 days in the shop plugged in. I went out and Toggle the ScanGauge II to show voltage and with the key off and nothing one is floating 12.0 to 12.1 volts. But since the block heater is plugged in there was no voltage drop because the manifold is 112*F...:lmao: So I got to leave the truck outside... As for the batteries it looks like new batteries will be coming soon... If the voltage is falling off during a 4 day park...:shocked:

Link to comment
Share on other sites
ISX

ISX

Posted
  • Author
Posted

Alright I still am curious, cause it seems you have a charged up voltage, a running with grids going voltage, and a voltage of it running with the grids off. I wanted to know the voltage of it when the engine is off and the WTS light is on with both grids going, that is where I got my 11.09..

Link to comment
Share on other sites
Hammer

Hammer

Posted
Posted

With my 12v I run 20 degrees of timing in it all year long,no matter what the temps are outside and have a big set of injectors.When it sits outside at work all night long unplugged I do what was shown here cycling the grids twice and then light her off.It will normally rip and snort a bit then clean out and purr while I am in turning my paperwork in from my trip and walk back out.I also watched my digital volt gauge(its a Cyberdyne) when the grids are cycling and the charging system drop down to 12 after the first cycle and then will dip from 12-14.2 until the grids kick out.My truck has Red Top Optima's in it and a 200amp Mean-Green Alternator to help ease the burden on the charging system somewhat.I have a set of Flex-A-Lite electric fans,A FASS 150/200-1010@45psi and a big stereo and installed the big alternator to ease the load on the electrical system.Since I did that and the Optima's I have had zero issues with my charging system and starting in the cold is a breeze.The one thing I am glad I did was the fans as in the Winter time it sure allows for the truck to warm up alot faster and when you drive it in the winter months they almost never run.......Andy

Link to comment
Share on other sites
Guest
This topic is now closed to further replies.
 Share
Go to topic listing

Rate The Author

Please take the time and give the author a 1 to a 5-star rating for the information you have gained from anywhere on the website. All forum threads, articles, etc. If a members post is good information please don't forget to tell them "Thanks" or "Like"

Rate Us On Google

Please take the time and visit our Google Review page and give us a review of our services.

Tip Jar

If Mopar1973Man.Com has helped you with quick and timely information for your repair please consider tossing a tip in the Tip Jar

×
×
  • Create New...