oilburner Posted October 21, 2012 Share Posted October 21, 2012 ok guys i need some addvice, my 98 e-7 454 all of a sudden started missing. It does not smoke just a dead miss, i craked the injector lines at the pump and # 5 is the miss, now it does not smoke, no blowby and no knocks or funny sounds it is just like the injector is not poping at all, were would you guys start, any advice would be greatly appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/ Share on other sites More sharing options...
staxx Posted October 21, 2012 Share Posted October 21, 2012 Swap #5 injector with another cylinder and see if it follows , if follows the injector nozzel is defective if not the # delivery valve in injection pump has issue also check to make sure injection line is not blocked depending on issue with delivery valve most of the time it can be repaired on the truck . Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142502 Share on other sites More sharing options...
theakerstwo Posted October 21, 2012 Share Posted October 21, 2012 Swap #5 injector with another cylinder and see if it follows , if follows the injector nozzel is defective if not the # delivery valve in injection pump has issue also check to make sure injection line is not blocked depending on issue with delivery valve most of the time it can be repaired on the truck . I all of my years working on trucks i never saw a fuel line blocked untill last year. A freind of mine one sunday came up and found a # 5 fuel line he need to check his with .Sure enough his line was blocked. He ask me how that can happen and i say it has to have metal faking off of the inside of the line doing it cause they have not done any thingb to the pump and its been over a year woring every day. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142560 Share on other sites More sharing options...
staxx Posted October 21, 2012 Share Posted October 21, 2012 Have seen delivery valve come apart once and the broken pieces block the line at cap and line connection have also seen where someone have removed injectors without backing the fuel lines out smashing the end of the line over. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142572 Share on other sites More sharing options...
theakerstwo Posted October 21, 2012 Share Posted October 21, 2012 Have seen delivery valve come apart once and the broken pieces block the line at cap and line connection have also seen where someone have removed injectors without backing the fuel lines out smashing the end of the line over. While we are talking fuel lines why is it so hard any more to keep the line to injector connection from leaking ?I dont work on them anymore other than mine but have had a few guys call me asking after replaing with rebuilt injectors. A freind ask me about a year ago that and he was replace the line two times each trying stop the leak and on one inector never got it stop and took it to the dealer were it was a big deal to stop.I think they even replaced the injectors again. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142588 Share on other sites More sharing options...
oilburner Posted October 21, 2012 Author Share Posted October 21, 2012 Have seen delivery valve come apart once and the broken pieces block the line at cap and line connection have also seen where someone have removed injectors without backing the fuel lines out smashing the end of the line over.Thanks everone, i am going to tear into it one day this week and i will post what i find and thanks again for the post, i will check that stuff frist. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142598 Share on other sites More sharing options...
alex g Posted October 21, 2012 Share Posted October 21, 2012 Just a thought but my E6 had #5 lifter take out the cam had a hell of a miss.Good luck Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142609 Share on other sites More sharing options...
oilburner Posted October 21, 2012 Author Share Posted October 21, 2012 Just a thought but my E6 had #5 lifter take out the cam had a hell of a miss.Good luckI hope it is not that bad, it could be just as simple as a blocked fuel line to a bad cam, if i take the covers off i will crank it over and wacth the rocker arms, that should be the way to check that out. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142628 Share on other sites More sharing options...
oilburner Posted October 21, 2012 Author Share Posted October 21, 2012 if it is the cam or vavle train i will get road hard over it if it is on the exhaust side, a guy i run with sometimes give me down the road because if the engine is warm and runing i have the jake on, and he want hardly use his he says they tear up the engines, but i have never had any issues out of this and i thank they are the best thing they ever came out with on a truck, and if they were that bad they would not even put them on a truck, and a mack dosen't have much of one anyway. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142630 Share on other sites More sharing options...
staxx Posted October 22, 2012 Share Posted October 22, 2012 Injector line leaking fuel issues . O-ring on injector old and dry rotted over tightening of fuel line to tight , failed or cracked injector body , miss alignment of injector to line, and injector cup leaking coolant most of the time its just the injector o-ring from loosing and then retightening injector line. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142670 Share on other sites More sharing options...
turckster Posted October 22, 2012 Share Posted October 22, 2012 While we are talking fuel lines why is it so hard any more to keep the line to injector connection from leaking ?I dont work on them anymore other than mine but have had a few guys call me asking after replaing with rebuilt injectors. A freind ask me about a year ago that and he was replace the line two times each trying stop the leak and on one inector never got it stop and took it to the dealer were it was a big deal to stop.I think they even replaced the injectors again.I used to have that problem years ago when I didn't use a torque wrench. Now I torque 'em every time and rarely have leaking problems. I think the main reason they leak is from over tightening and distorting the tip of the line. Maybe even damaging the injector as well. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142673 Share on other sites More sharing options...
oilburner Posted October 22, 2012 Author Share Posted October 22, 2012 Ok everyone, today i checked the injector lines and they were good, i pulled the # 5 and #4 injector and swaped holes just to see if the miss went to #4, it stayed at #5, also took the lines off and tigthed it back on the pump on #5 and pointed it out away from the truck, it did not look like there was as much fuel coming out of it as the others, and i could hold my tumb over the end of the line and stop the fuel, i tryed this with the others and i could not stand to hold my tumb over it more than a secound. I checked the rocker arms and they all moved fine when the engin was running, do you all thank it is the barrel on the #5 in the pump or what and if anyone could post pictures of the pump break down it would be help ful to me Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142754 Share on other sites More sharing options...
staxx Posted October 23, 2012 Share Posted October 23, 2012 Please dont stick your thumb over fuel line that s not the best thing to do but it does sound like the delivery valve is down, . there is a special tool to remove it the spring valve and barrel washer are all under it if the spring and valve are broken they can be replaced on the truck if it is any deeper pump will need to come off Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142761 Share on other sites More sharing options...
oilburner Posted October 23, 2012 Author Share Posted October 23, 2012 Please dont stick your thumb over fuel line that s not the best thing to do but it does sound like the delivery valve is down, . there is a special tool to remove it the spring valve and barrel washer are all under it if the spring and valve are broken they can be replaced on the truck if it is any deeper pump will need to come off I could tell by the amount of fuel it was spraying that there was some thing wrong, i had a pair of leather gloves on, just incase. I was told it took 2200 psi to open the injectors, and i am sure it was no were near this, it also made a tapping sound when you broke the number 5 line at the pump, thanks for all the addvice Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142777 Share on other sites More sharing options...
220cummins Posted October 23, 2012 Share Posted October 23, 2012 Please dont stick your thumb over fuel line that s not the best thing to do but it does sound like the delivery valve is down, . there is a special tool to remove it the spring valve and barrel washer are all under it if the spring and valve are broken they can be replaced on the truck if it is any deeper pump will need to come offwhat he said. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142811 Share on other sites More sharing options...
oilburner Posted October 23, 2012 Author Share Posted October 23, 2012 Well found the problem.. took the pump to city diesel and it was the #5 cam lobe, Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142890 Share on other sites More sharing options...
staxx Posted October 24, 2012 Share Posted October 24, 2012 Well if you going to have them build it tell them to set it to the high end spec,s while there in it. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-142927 Share on other sites More sharing options...
oilburner Posted October 25, 2012 Author Share Posted October 25, 2012 Truck runs great now, i belive the pump has been week since we got it, but went to do the over head and found #4 vavle spring broke, and the jake head had the flat springs broke off laying in the head, and the master piston had feel out, has anyone ever changed a spring without pulling the head we were thanking about trying to use air to hold the vavle up will this work on the engine, and why would the pring just be broke. It broke at the top coil. And thanks everyone for the advice, i love this page!! Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-143052 Share on other sites More sharing options...
dds92780 Posted October 25, 2012 Share Posted October 25, 2012 I cant wait to get mine done too. I have an e7 350 mechanical with number 6 running cold with a slight miss and i want get my pump turned up too when they rebuild it. Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-143059 Share on other sites More sharing options...
staxx Posted October 25, 2012 Share Posted October 25, 2012 Just make sure piston is at top dead center no problem changing spring unless the valve keepers are all chewed up. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-143069 Share on other sites More sharing options...
staxx Posted October 25, 2012 Share Posted October 25, 2012 Over speed would be my first thought or incorrect valve and jake lash settings , valve rotators can fail and put stress on spring also or if anyone for some reason did some welding in there. Quote Link to comment https://www.bigmacktrucks.com/topic/27913-e-7-5-cyl-miss-no-smoke/#findComment-143070 Share on other sites More sharing options...
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