Keffer inc Posted May 29, 2017 Share Posted May 29, 2017 My truck has always had a mild misfire and it got worse this week. Now it starts missing really bad at 1300 rpm. I've been trying everything else like egr preasure sensors, checking the tunes on the dpf diff sensor but I guess it's either bad cups or injectors, possible low fuel preasure? It used to normally act up at the 1500 rpm range and be intermittently missing. (Running rough for 60 seconds and smooth out for 120 seconds like it was an electronic malfunction. Also, the dpf has been going frequent regen and now wentry into limp mode. The warning (blue switch) went stright to blinking and later the red shut off lamp started coming on intermittent and then ATS needs service came up. Not the way it was to work as the manual says. What do you guys think is going on with the miss? I'm assuming I'm running rich if the dpf is clogged. I also checked the dpf preasure sensor tube and they are clear. Bad sensor for the warnings not properly working?? Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/ Share on other sites More sharing options...
Keffer inc Posted May 30, 2017 Author Share Posted May 30, 2017 I forgot to say that the computer isn't showing any miss fire codes. Non for individual injectors and the for multiple cylinders. Neither codes come up? Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371042 Share on other sites More sharing options...
fjh Posted May 30, 2017 Share Posted May 30, 2017 In my opinion ya need to get hooked up ad do a compression test ( cyl balance ) etc as much as you would like to avoid the shop you need th bite the bullet and do it could still be a wiring harness or a bad valve not unheard of, and Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371043 Share on other sites More sharing options...
kscarbel2 Posted May 30, 2017 Share Posted May 30, 2017 Did you have your local Mack brand dealer look at the truck and provide you with an in-depth diagnosis? If necessary, they could have their district service representative come in to look at it (I assume Volvo hasn't cancelled that Mack position). Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371044 Share on other sites More sharing options...
Keffer inc Posted May 30, 2017 Author Share Posted May 30, 2017 I'm going in the morning to at least fix the dpf. Would like to get home for the injectors so I can be with my family while I'm not working. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371046 Share on other sites More sharing options...
Keffer inc Posted May 30, 2017 Author Share Posted May 30, 2017 So best case if all I need is a dpf cleaning, it is $1,300 or $3,400 if the DPF filter is wasted and needs to be replaced. Also they say the injectors are what need to be replaced so they said the bill all together is $8,500. And down time I should be back out of the shop by tomorrow night. Almost sounds too good, is it? Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371092 Share on other sites More sharing options...
fjh Posted May 31, 2017 Share Posted May 31, 2017 Yup the injectors likly took out the dpf Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371119 Share on other sites More sharing options...
Underdog Posted May 31, 2017 Share Posted May 31, 2017 I just can't comprehend the cost of repairs on these new trucks!!! Scary. I barely have $8500 into my entire truck. 1985 MH. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371123 Share on other sites More sharing options...
james j neiweem Posted May 31, 2017 Share Posted May 31, 2017 Used to be able to do a complete engine exchange for 6-7 thousand bucks back in the 80's. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371129 Share on other sites More sharing options...
Underdog Posted May 31, 2017 Share Posted May 31, 2017 9 hours ago, james j neiweem said: Used to be able to do a complete engine exchange for 6-7 thousand bucks back in the 80's. Yes I remember early '90s my boss doing Pedigreed exchange E6 for $7500 with my labor! I remember one time they tried to screw us out of the core, until I pointed out to the boss that the cracked block they sent back wasn't our core. The engine I pulled out had screw in expansion plugs, and the rejected core had press in plugs. I think the boss bought my lunch that day. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371134 Share on other sites More sharing options...
Keffer inc Posted May 31, 2017 Author Share Posted May 31, 2017 Well it got worse, the cam shaft is ate up, all the lobes have at least a 1/4" groove dug through them. It's amazing the truck could function at all. Looking at $18,000 now to still do injectors, replace my bad dpf filter, and a new cam. I only paid $25,000 for that truck. This truck better run like a raped ape when it comes out. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371142 Share on other sites More sharing options...
TeamsterGrrrl Posted May 31, 2017 Share Posted May 31, 2017 How many miles on this thing? A 2011 shouldn't be showing this much wear unless it was run almost 24/7! Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371149 Share on other sites More sharing options...
Keffer inc Posted May 31, 2017 Author Share Posted May 31, 2017 I thought it was premature too, the truck only has 733,000 miles on it. I think it had 675,000 when. I bought it and I didn't idle it over nights. So abuse from the first owners? I think the first owners were in Ca. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371152 Share on other sites More sharing options...
Popular Post david wild Posted May 31, 2017 Popular Post Share Posted May 31, 2017 spent a little over 11k last month on 18k truck, sold it for 20k this month, going back to antique Macks like we had before and made money. 1 7 Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371163 Share on other sites More sharing options...
Keffer inc Posted June 1, 2017 Author Share Posted June 1, 2017 I was wondering how badly I am stuck with thus truck but it sounds like I own it for life. It is what I want and set up as I wish. A little long on the wheel base for a tag axle would be nice but it's a good spec. It has to run good though with all this though. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371180 Share on other sites More sharing options...
Underdog Posted June 1, 2017 Share Posted June 1, 2017 Good luck, I hope you are satisfied with the end result. If you like the truck, keep it. My biggest issue with the new emissions trucks is the cost. After it is out of warranty, it is difficult to justify the cost effectiveness. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371192 Share on other sites More sharing options...
TeamsterGrrrl Posted June 1, 2017 Share Posted June 1, 2017 Good luck finding a pre-emissions truck, they've had to meet emissions standards since the 80s. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371198 Share on other sites More sharing options...
Underdog Posted June 1, 2017 Share Posted June 1, 2017 22 hours ago, TeamsterGrrrl said: Good luck finding a pre-emissions truck, they've had to meet emissions standards since the 80s. 1985 E6, thank you very much. I suppose 4 valve heads and a puff limiter are emission components I can live with. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371199 Share on other sites More sharing options...
TeamsterGrrrl Posted June 1, 2017 Share Posted June 1, 2017 The major effects of the early 80s standards were the end of the bigger naturally aspirated diesels. Sure you don't want to lose that expensive and troublesome turbo? Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371200 Share on other sites More sharing options...
Underdog Posted June 2, 2017 Share Posted June 2, 2017 21 hours ago, TeamsterGrrrl said: The major effects of the early 80s standards was the end of the bigger naturally aspirated diesels. Sure you don't want to lose that expensive and troublesome turbo? I drive my F model 673P so I can save wear and tear on my turbo MH. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371249 Share on other sites More sharing options...
Popular Post 68-f-model Posted June 2, 2017 Popular Post Share Posted June 2, 2017 (edited) Pull the MP8 and slide in a 8v-71 or 8v-92 for equal hp. Then you can have a blower and turbo as well as a automatic rust preventative underbody oiling system. Edited June 2, 2017 by 68-f-model 1 5 Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371269 Share on other sites More sharing options...
Keffer inc Posted June 2, 2017 Author Share Posted June 2, 2017 No way! I don't want an automatic. I have an eaton 10 spd. Everyone lovee that M drive but I still don't trust it. Give it a decade and then maybe I'll be I'll trust it. As for my truck, I haven't heard any news for a while so Im going over to see what's up this afternoon Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371290 Share on other sites More sharing options...
68-f-model Posted June 2, 2017 Share Posted June 2, 2017 (edited) Let me re phrase that. The Detroit diesel 8v-92 will be automatically applying a oil coating to the bottom of your truck. It is a Detroit diesel joke that they leak. I wouldn't ever recommend or suggest such a thing as an automatic transmission in a Mack. Sell the new Mack and get your self a nice Mack super liner. For what you have in engine repairs alone you could have a decent old Mack and modify it to your liking. Then you would have something more reliable and cheaper to maintain and repair. Edited June 2, 2017 by 68-f-model 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371298 Share on other sites More sharing options...
Rockwell Posted June 5, 2017 Share Posted June 5, 2017 Really sorry to hear of your troubles Keffer, just a real shame. Ya go out and buy a rig to provide for your family and have this happen. Im in the same boat as you, big piece of me regrets buying this truck. Nothing but reliability issues, to much money spent on emissions garbage, and most repairs have you locked into Mack doing them. Like you, for the moment im stuck with it. Mine has 540,000 miles on it and i still owe to much to sell it. Far to much complexity in these trucks. Its got me walking in fear everyday of the next multi-thousand dollar repair. Its as if they are "built to break". I have near zero confidence that this truck will live long enough to either sell or be payment free. Always 1 mile away from disaster. I've been trucking since 1989, and if any truck can take me out, this is the one. I hope your troubles pass quickly and with good resolve. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371526 Share on other sites More sharing options...
Keffer inc Posted June 5, 2017 Author Share Posted June 5, 2017 I'm still in Amarillo Tx, Friday they completed the cam, injectors, and dpf. We went for a test drive and it was still missing badly, maybe even worse. At first they were thinking maybe a valve was damaged inside the head. But Saturday a tech decided that it may have been a fault injector that they got. Haven't heard anything yet but I hope that's it. I've been at a hotel for a solid week now. Quote Link to comment https://www.bigmacktrucks.com/topic/50009-mp8-still-sucks-at-life/#findComment-371537 Share on other sites More sharing options...
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