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Spit/sputter misfire? Defueling?

OlPurp98
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Mopar1973Man

Mopar1973Man

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I didn't catch that the first time. :doh: 

 

I was looking more at the timing curve. Then the wiretap with 2200us pulse that should smoke like a train. That's why I wonder about the wiretap. It should roll coal. As for CANBus mine amps up to 140% or so but the very last entry is 85% in the 30+ PSI position (EGT control). Based on several hard runs and watching the backdown number this subtract the backdown from the 30+ PSI number and get your cap. 

 

Daily economy tune...

 

Capture+_2019-04-18-07-15-34.png

Edited by Mopar1973Man
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OlPurp98

OlPurp98

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So with all that being said no mater what I have done I've never seen that truck smoke on any tune I've ran since I replaced to VP (I can't contest to the factory VP cause the first time I let it rip I lifted fast and seized the rotor) is it possible I got a bad vp does that explain the lack of smoke and all the spit and sputter pop and crack?

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Dieselfuture

Dieselfuture

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5 hours ago, Mopar1973Man said:

As for CANBus mine amps up to 140% or so but the very last entry is 85% in the 30+ PSI position (EGT control). Based on several hard runs and watching the backdown number this subtract the backdown from the 30+ PSI number and get your cap

I'll have to try that

To OP any codes for map sensor, boost leaks, what's the fuel pressure at wot?

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OlPurp98

OlPurp98

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Here in the past few days I've had a misfire on a hot start. Misses 3 or 4 times then straightenes right out and runs fine doesn't skip a beat on factory level 2 tune but still gets more and more angry as the levels go up and really gets pissed off when I run the tune I posted earlier and still just a haze of grey smoke turned all the way up

Since installing the fuel pressure sender for the quad following @Mopar1973Mans instructions in another post. fuel pressure hangs out between 13 and 15 just cruising and wot it will go to 9 and then hop right back up after the initial draw, just for the hell of it I cycled the lift pump one time while my main feed line was off to make sure the fuel wasn't full of air bubbles or lack of volume and that was a mistake considering I only had a 1/2 gallon catch can cause it filled that up and was still dumping it on the floor for me to clean up so I feel that I have plenty of fuel going to the VP 

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OlPurp98

OlPurp98

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So think tonight has solved it all while driving the truck coming to a stop I noticed that my fuel pressure kept dropping when coming to a stop then when I accelerated would hop back up 10 secs later.. had 1/4 tank of fuel and have a beans diesel sump on the bottom of the tank when braking hard all the fuel will rush to the front of the tank causing the fass to start sucking air then when you get going the fuel will return and pressure will hop back up and stay there so I think that's why I'm having all these issues the VP has been starved for fuel alot when driving with less than 1/4 tank and that's why my truck is acting up the VP is barely hanging on and can't fuel to the adrenalines standards 

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Dieselfuture

Dieselfuture

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I try to stay half a tank or above for a lot of reasons. But ever since I did draw straw 5 I can suck the tank dry. That's without hard breaking or accelerating. Any time I know I'm going on a trail riding I'll fill the tank up. In an emergency situation or if thete is no gas stations, I can pretty much empty the tank riding down the highway.

I guess my point is, if you're playing around keep the tank full.

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OlPurp98

OlPurp98

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So I ended up drinking a little too much and never went and snagged the man at thoroughbred... but I was told to check my crossover tubes and make sure they are seated and that there is no blockages on the return side of my fuel system all checks out good, also when I was out of town walked out the hotel room and she was being stubborn had a hard start long cranks with a hit and a miss here and there was about to bleed the injectors and Bam she fired up stumbled for a min and hasn't skipped a beat since ( this was Saturday morning). Could this be VP related or was this just something stupid?? Oh and I forgot to mention when the low fuel and sump and 1/4 tank issue popped up I instantly thought the lift pump was cutting out because I was told the ecms where famous for cutting out lift pump signal on the early 24v models (this info was from bluechip) so I wired it to a key on accessory. So to wrap it all up should I just yank the VP off and send it to thoroughbred I was told to leave my cover and wiretap on there so they could check it with and without pump tap or do y'all have any ideas of something else to check because I ain't looking to go 2 weeks without my ride. 

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dripley

dripley

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1 hour ago, Dieselfuture said:

Popping out of exhaust or intake was usually caused by wrong timing on gassers, I never experienced it with this truck so I can't tell for sure. I think it's timing related. 

Is it possible to have vp installed 180* off somehow. 

I think that would be a major accomplishment. Maybe i need to try that one. I have BFH.

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Dieselfuture

Dieselfuture

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7 hours ago, dripley said:

I think that would be a major accomplishment. Maybe i need to try that one. I have BFH.

Well I know the whole key thing on VP, what if someone rotated the actual gear 180 or is just a toof or two off. 

Edit 

I suppose it could be a broken tone ring on the crankshaft, idk just brainstorming

Edited by Dieselfuture
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