Bluebulldog Posted October 5, 2023 Share Posted October 5, 2023 Have a 99 355-380. When you sit at idle for few minutes it will stubble when you accelerate just twice then even out and pull good. Just changed filter but have my doubts still smokes black on acceleration. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/ Share on other sites More sharing options...
doubleclutchinweasel Posted October 5, 2023 Share Posted October 5, 2023 Injectors? 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539768 Share on other sites More sharing options...
Bluebulldog Posted October 5, 2023 Author Share Posted October 5, 2023 I wander truck has 750k on it. I’ve only had it since 680k. That or a unit pump I wandered??? Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539769 Share on other sites More sharing options...
Joey Mack Posted October 5, 2023 Share Posted October 5, 2023 Check fuel pressure, 60-80 psi.. there is a 1/4" NPT plug behind the breather. You can put a gauge there.. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539770 Share on other sites More sharing options...
Bluebulldog Posted October 5, 2023 Author Share Posted October 5, 2023 Behind the breather? Surely not up on the fire wall?? Or you talking crankcase breather. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539772 Share on other sites More sharing options...
Joey Mack Posted October 5, 2023 Share Posted October 5, 2023 Crank case breather.. you will need a 1/4" drive extension. It's a square plug. I suggest using an adapter for a 3/8" ratchet.. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539773 Share on other sites More sharing options...
fjh Posted October 6, 2023 Share Posted October 6, 2023 21 hours ago, Bluebulldog said: I wander truck has 750k on it. I’ve only had it since 680k. That or a unit pump I wandered??? Should likley throw a code if it was a pump ! Check out Joeys theory First then clean the crank sensor ! and the block grounds! I lean towards a fuel pressure issue too! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539799 Share on other sites More sharing options...
Bluebulldog Posted October 8, 2023 Author Share Posted October 8, 2023 Well I hope I was wrong. Changed the fuel water separator filters and it hasn’t done it since. So maybe easy fix 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539853 Share on other sites More sharing options...
Joey Mack Posted October 8, 2023 Share Posted October 8, 2023 Does it have a Davco 382 fuel filter? Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539854 Share on other sites More sharing options...
Bluebulldog Posted October 10, 2023 Author Share Posted October 10, 2023 Yes Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539954 Share on other sites More sharing options...
Bluebulldog Posted October 10, 2023 Author Share Posted October 10, 2023 Guess I was under the impression that the fuel level was suppose to be about 3/4 of the way up that before it needs changed. This one runs with about 1.5” in the bottom. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539955 Share on other sites More sharing options...
Joey Mack Posted October 10, 2023 Share Posted October 10, 2023 It is supposed to start out at about 1 inch from the bottom, and as the filter clogs the fuel rises.. yes 3/4 from the top is time to change it.. I recently posted the fix for that filter unit.. take a look.. there is a check valve that is easy and cheap to replace, as part of anual maintenance.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-539956 Share on other sites More sharing options...
Bluebulldog Posted October 12, 2023 Author Share Posted October 12, 2023 (edited) Problem has came back after a week of running. I’ll take a look at your fix and see what fuel pressure is. Seems odd it went away for that long and all at once Edited October 12, 2023 by Bluebulldog Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540152 Share on other sites More sharing options...
Bluebulldog Posted October 12, 2023 Author Share Posted October 12, 2023 Fuel pressure at idle is 115ish Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540160 Share on other sites More sharing options...
Joey Mack Posted October 12, 2023 Share Posted October 12, 2023 PSI ??? That cant be right.. it should have blown out the EUP o-rings and put fuel in the oil... Way too high.. re-check, if it is not between 60-80 PSI,, remove the regulator and inspect it.. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540161 Share on other sites More sharing options...
Bluebulldog Posted October 12, 2023 Author Share Posted October 12, 2023 I had it running twice it’s hard to hold the hose clamps on what I had available so I’d guess that’s right. What regulator we talked about?? Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540162 Share on other sites More sharing options...
Bluebulldog Posted October 12, 2023 Author Share Posted October 12, 2023 Unless the gauge is no good but it’s a good oil filled guage Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540163 Share on other sites More sharing options...
Bluebulldog Posted October 12, 2023 Author Share Posted October 12, 2023 Engine oil is right on the full mark 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540164 Share on other sites More sharing options...
Joey Mack Posted October 12, 2023 Share Posted October 12, 2023 it is below #4, it may be silver in color, it's 45 degrees. It also may have the small 5/16'' return line atached as well.. that is the return port and it is the regulator.. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540165 Share on other sites More sharing options...
Joey Mack Posted October 12, 2023 Share Posted October 12, 2023 ok, if you are confident in the gauge, then you need to check the regulator.. really, I dont take them apart, i replace them.. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540166 Share on other sites More sharing options...
Bluebulldog Posted October 12, 2023 Author Share Posted October 12, 2023 Ok I put another guage that just goes to 60 and it spun it again the zero stop and bent the needle so I’d say it’s right. I’ll call Mack in the morning and get a regulator. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540169 Share on other sites More sharing options...
Joey Mack Posted October 12, 2023 Share Posted October 12, 2023 Sorry about the small gauge, but glad you checked again.. The new regulator may be 80 PSI.. Thats ok.. when you remove the old regulator, the fuel galleries will drain. You will need to prime the hand pump to build up pressure. It may take a few extra seconds to start. Please do not use ether...... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540170 Share on other sites More sharing options...
Bluebulldog Posted October 12, 2023 Author Share Posted October 12, 2023 This isn’t going to fix my problem though is it? Just something else we found along the way. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540171 Share on other sites More sharing options...
Joey Mack Posted October 12, 2023 Share Posted October 12, 2023 it may, but is a new issue that needs to be dealt with.. ''Fix what you know is broke''.. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540172 Share on other sites More sharing options...
Joey Mack Posted October 12, 2023 Share Posted October 12, 2023 did you locate the regulator? maybe send a picture if you arent sure.. Quote Link to comment https://www.bigmacktrucks.com/topic/73388-e-tech-miss/#findComment-540173 Share on other sites More sharing options...
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