Sounds like you know your Mack's pretty well.Ĭlick to expand.Here ya go! Sorry for the poor quality, but the important stuff is all legible. Due to the colors it's sporting, (gold/burgundy) we call it the peanut butter and jelly truck. It used to be a Warrior Express sleeper truck that was chopped into a day cab. Other than that, it's a very nice, clean truck. Looks like someone tried to shove some silicone in there to fix it but it didn't work so well. and a not so bad oil leak coming from where the turbo drain tube meets the oil fill tube.
#99 MACK STARTER RELAY DRIVERS#
Everyone I've talked to says it's relatively normal for a Mack (since it's not puffing it out, just a steady stream when hot only) so I'm not really gonna worry about that.Īlso, I have a pretty bad oil leak coming from behind the lower twin filters on the drivers side. :beatsmeĭid the Mack dealer happen to show you where these possible bad grounds were located? I don't mind cleaning them up if so.Īnother thing that kinda bothers me is the blowby coming from this engine. I wiped the sensor clean and put it back in and the jumpy idle went away again. A friend of mine that used to work at a local Mack dealer said that if there was to have been metal particles on the sensor after such a few amount of miles that the gear set may be going bad and would need replacing. I didn't really see any fragments worth worrying about.
![99 mack starter relay 99 mack starter relay](https://alcolockusa.com/wp-content/uploads/2018/12/what-happens-if-i-fail-a-breath-test.jpg)
I didn't see the metal he spoke of but I went ahead and pulled it out last night to see if there was any more metal on it. The sensor is located on the passenger side front by the timing gear area. One thing worth mentioning is the mechanic at the dealership said he saw some metal on the sensor we replaced. We did not have a constant CEL at the time. Also, the guy that read my codes with the hand held did so while the truck was doing the rough idle and warm.
![99 mack starter relay 99 mack starter relay](https://imagehost.heavytruckparts.net/tn/Mack_8609-98226wr_Relay%2C-Electrical_7641244_1_96056_1.jpg)
#99 MACK STARTER RELAY DRIVER#
I don't have a constant CEL but like I said, my driver told me yesterday that he saw the lightning bolt symbol light up on the dash a few times while on the road. I can't find that list anywhere on the web.
![99 mack starter relay 99 mack starter relay](https://ww2.justanswer.com/uploads/MU/muddyford/2012-11-15_180539_1.png)
I will surely take you up on the list of fault codes. I have the list of codes, and can copy them for you, but it'll have to be tonight, gotta go make some money right now. It'll be a two digit #, with a slight pause between seperate codes.
#99 MACK STARTER RELAY CODE#
You can check your codes with the cruise control switch's, but you must have a stored code (ie, CEL stays on) You do itby having key on, cruise power switch off, and hold RESUME/ACCEL switch on until CEL light goes out. I could go on and on about my dealings with Mack over this stuff and more, but won't. Mine has done all this since new, hasn't gotton any worse, and I'm to the point now I just figure it's a Mack ( and that's not in a good way):cool2 Guages will bottom out and come back too, sometimes. Freaks me out when it happens while going through an intersection. I've also intermittant CEL that'll come and go, dealership has no clue why, thought grounds? Mine will even shut down for a split second while going down the road, and then start right back up. I've over 500k miles on it now and it still has a jumpy idle, and acts just like you described. Dealership could not get it to not do it either, but told me some Macks just have this problem. Serv, my Mack, also a 2003 CX613 (but with a 460 instead) has had a jumpy idle when hot since new.
![99 mack starter relay 99 mack starter relay](https://www.carparts.com/blog/wp-content/uploads/2020/11/starter-solenoid.jpeg)
I've tried googling for a self test function in these engines but I can't find anything. Also, my driver reported an occasional check engine light on his 380 mile loaded trip yesterday but I have yet to see a CEL when I've drove it about 6 hours with no trailer. About evdry three seconds or so I get that slight upward jump in the RPM. What's happening is when hot, it idles smoothly for about 3 seconds then I get a split second "upward" surge where it jumps up about a hundred RPM. We put a computer on it at the dealership that sold it to me (6 hours away from me now) and it showed a code that said "engine position sensor-erratic idle" We swapped in a new sensor and the problem went away for about the first 3 hours of driving then it came back. Is there any way to read fault codes without the scanner? I ask this because someone told me you can manipulate certain speed and other settings in the computer by pressing a certain combination of buttons on the dash and somehow entering the last so many numbers of the VIN. I just bought a 2003 Mack CX 613 with a 427 horse E7 with 507k miles.