97 ram noise from engine

From : paul1958

Q: ah ok i was familar with the mechanical injectors. and the pre injection bit to quieten the engine. but was out of the dodge shop aparrently before word of a 3rd squirt was passed down my way anyways. and had me puzzling as to why there would be. thanks for the info. -- -chris 05 ctd 99 durango alright tom you have got my curiosity up......triple squirters from the first 12v 6bts through the last of the vp44-injected 24v isbs there has always been a single injection event hydraulically-actuated pump puts high pressure on the fuel line overcoming the spring in the injector and the injector pops off spraying fuel through the nozzle. with the advent of electrically-actuated injectors it became possible to have multiple injection events per combustion cycle. starting with the hpcr engine in 03 there was a pilot injection event which squirted a miniscule amount of fuel to begin the combustion process followed by the main injection event which delivered a much greater by comparison amount of fuel. its this pilot injection that had the most dramatic effect on quieting the engine. instead of all the fuel arriving essentially at the same time and exploding a much smaller explosion happens during the pilot injection. now when the main injection event occurs its more of a burn rather than a bang. that reduced the classic clatter noise of the diesel significantly provided more power and is probably a little kinder to the engine as well. starting in 04.5 cummins added a post-injection event - which has something to do with cleaning up the emissions yeah - go figure - they make it cleaner by spraying more diesel and the way things interact with the catalytic converter etc. etc. i dont understand it and frankly i dont want to. theres great interest in a programmer that can turn off this third event as it does nothing for power production. there may be a solution coming in the next several weeks out of italy... time will tell. at any rate theres your triple squirt - pilot injection main injection and post injection. hey i learned something today thanks tom al .

Replies:

From : ramtec1

nospam@mymail.com wrote turn $500 into 500 in 3 weeks! shoot i can do that in about 10 seconds ............ want to see me do it again .

From : paul1958

its a professionally rebuilt 318 with 3000 miles at most. the truck has like 89000 on it. i plugged the egr valve because i questioned if it was working and it ran fine plugged. a mechanic friend of mine said it would be fine and it is not needed. but im sure he could have been mistaken. still unsure. definition the egr valve is the main emissions control component in the exhaust gas recirculation system. the valve is located on the intake manifold and opens a small passageway between the exhaust and intake manifold to allow a metered amount of exhaust to flow back into the engine. this reduces combustion temperatures and helps control the formation of oxides of nitrogen. the egr valve is opened by the application of vacuum to its control diaphragm. some also require a certain amount of exhaust back pressure before theyll open. on newer vehicles the valve is electronic and uses one or more solenoids or a small stepper motor. the valve should remain closed while the engine is cold and at idle. it should only open once the engine has warmed up and is running at part-throttle. if the valve sticks shut or is disconnected nox emissions will soar and detonation will often result see detonation and spark knock. if it sticks in the open position or fails to close all the way it acts like a vacuum leak resulting in a rough idle hesitation and possible stalling. ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- .