Engine/Transmission (1994 - 1998) miss at idle`

[onestackdram]

On a 95 nv4500.



when the truck is first started in the morning its fine but after warming up and being put to work there is a miss in the idle the miss is a hard miss very noticeable the problem is occurring anywhere from 30 minutes to 3 hours



also this truck doesnt have guages so i have no idea what it is running. secondly the truck is BONE STOCK i am working on informing him of the bombing ways.



Russell

 

[ndurbin]

did ya try crackin the injection lines to see if it was an injector?

 

[onestackdram]

thats what we are thinking is wrong with it. but i thought i would go ahead and check with everyone on here and see what they thought.



on a related subject. i have talked him into just stepping up and getting 300's for it. my question to that is will he need delivery valves for that pump? i know that the 215 pumps can run em fine but never having a 185 pump or 165 (not sure what came with the 95 man. ) i am not sure if the stock delivery valves can handle an upgrade in higher flowing injectors like 300's.



Russell

 

[ndurbin]

depends if its a man. or auto



94 and 95 auto's have the 160

94 and 95 man. 's i'm not sure about but i would guess the 180

96 and up autos have the 180

96 and up man. has the 215



theres a post alil ways down on 191s. i think it says they aren't really need on the 215 pumps til 400 hp. but are needed on the 160 and 180 pumps

 

[Cooker]

The 300 injectors do not have the best spray pattern as compared to 215's and 370's. For an in between injector I think DD2's would fit the bill.



191 D-Valves are not a necessity on the 180 or 215 pumps.



I would check you fuel pressure. To see what is going on when the truck is missing.

 

[onestackdram]

well dd2's may be a better injector but for the price i think he will be extremely happy with them. I run them for day to day driving and have liked them a lot. and with him being completely stock this should be a good enough kick in the pants to bring him around.



Russell

 

[Cooker]

I am pretty thrifty, so price is always an object for me. I agree DD2's can be a little spendy. Personally I would opt for the 370's over the 300's. I have heard from many individuals that the 300's are not an optimal injector for the 12v's (there must be a reason Piers does not sell them, http://www.piersdiesel.com/DodgeUSPrice.htm ) Who knows, some guys run 'em and love 'em?