CAT C15 help!!
Ken

Marion, IN

#67 Apr 4, 2012
bev wrote:
we also have bought a cat accert beautiful truck we live in australia but it is also well when it sees a slight climb it gets scared and says i think i can but it just does, we have done many test on it and can anyone give me some news on how to help this motor give a bit more witout ruining our standards or do we have to just live with it...our c 15 inthe other truck is beautiful and that is why we bought this one as we thought it would perform the same thanks bev
I imagine your "other" C-15 is a single-turbo and the engine serial number starts with a "6NZ"? Those engines are top performers! What year is the Accert? If the serial number starts with "BX", it's considered a "bridge engine" (the first twin-turbo Accerts). The ECM profile on these was not right, and everyone complained about power & fuel mileage! If your serial number starts with "MX" (from 2006 on) then you've got the better Accert engine.

Your engine probably came from the factory set at 475 hp, but it can be uprated to 600 hp just by changing the ECM settings. I have our fleet set at 550, and they out-pull everything on the road. Of course, I keep them properly tuned :)

Regardless of which engine you have, lack of proper fuel pressure is a common problem with these Cats. The spring inside the fuel transfer pump is weak, and gets even worse over time. Cat sells an upgraded "spring kit" for these pumps. I would have the fuel pressure tested first, it should be 75 psi @ idle, 100 psi @ 1800 rpm. During normal driving operation it should be about 85 psi.

The only way to check the pressure is to "physically" connect a fuel gauge to the system. The Cat ET program (software the Dealers & repair shops use) does NOT show the fuel pressure!

Good luck with your truck!
Big John

United States

#68 Apr 30, 2012
bev wrote:
we also have bought a cat accert beautiful truck we live in australia but it is also well when it sees a slight climb it gets scared and says i think i can but it just does, we have done many test on it and can anyone give me some news on how to help this motor give a bit more witout ruining our standards or do we have to just live with it...our c 15 inthe other truck is beautiful and that is why we bought this one as we thought it would perform the same thanks bev
Assuming that the all other factors are equal (gear ratios, transmission, etc.) and that the "other truck" is a pre-Accert, the Accert engine is NOT going to perform as well. I own a 2003 C-15 pre-accert and it pulls better and gets better fuel mileage than an Accert. I refuse to upgrade because I have the last of the un-neutered Cats.
Cat God

London, KY

#69 Apr 30, 2012
Great advise, awsome forum, 2 things that I have seen that was out of the ordinary, 1st, battery cable connecton, had one doing this and the connection was loose,,,2nd cam timming sensor, changed several for that problem, now I red the other posts on here and all are very good information had seen them all cause the problem.
Cat God

London, KY

#70 Apr 30, 2012
Ken You are right the MXS IT is better OF THE TWO, but the bxs is a bit better for going more towards the 6nz coniguration, if you want something that will fun and work without the constant breakdowns
Cat God

London, KY

#71 Apr 30, 2012
Oh Yea, pretty sure the BXS nor the MXS can be reconfigured to 600 hp, without Iron change, now a 625 was produced but diden't produce the power advertised on the Dyno
gonenuts

Buffalo, NY

#72 May 1, 2012
I am putting together a 2013 Peterbilt glider kit and want to put a 40pin 3406E 1LW into it. How do I adapt the 40pin to the 70pin?
Ken

Marion, IN

#73 May 1, 2012
You will need a Deutsch-type adapter plug/harness. You can find these for sale online, check this link here to get an idea of what is needed. I've never done business with this site, so I can't recommend them, but their pictures and descriptions of the required adapter is very clear. Good luck with your truck!

http://www.mawkindustries.com/cat.htm
Rod

Hanover, PA

#74 May 9, 2012
any ideas as to what code 94 is on my c-15?
Ken

Marion, IN

#75 May 10, 2012
Rod wrote:
any ideas as to what code 94 is on my c-15?
Flash code 94 can mean 3 things, but they are all related to the #5 cylinder. Either the voltage to the the Intake Valve Actuator on #5 is too high, too low, or the Actuator is not responding. When I connect my computer, it shows the actual codes 289-05 (voltage low) 289-06 (voltage high) 289-07 (not responding).

Assuming that your wiring inside the head is OK, the Intake Valve Actuator on the number 5 cylinder has failed. This is a common problem, I change these Actuator Solenoids all the time. Cat recommends that you change these in "pairs", so you would change cylinder 5 & 6 at the same time. They sell these as two-in-a-box, also. I pay $310 a box ($155 each) and there is also a "core charge", unless you already have the old ones taken off your engine first.
thumper

Pea Ridge, AR

#76 Jul 9, 2012
i have an 03 western star with a c15 cat sigle turbo has amiss in it changed filters to cat also had overhead run injector cut out test they said iject0rs were good any suggestion for me

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#77 Jul 10, 2012
thumper wrote:
i have an 03 western star with a c15 cat sigle turbo has amiss in it changed filters to cat also had overhead run injector cut out test they said iject0rs were good any suggestion for me
Since you've already had the injectors tested and the valves adjusted, the only thing left to test is the fuel pressure. If the fuel pressure is too low, the engine will "skip" or "miss" on different cylinders while the engine is running.

The only way to accurately check the fuel pressure is to physically connect a fuel pressure gauge to the "return fuel line" on the housing above the fuel filter. The fuel pressure should be 65 to 75 psi at an idle. If it's low, you can fix it easily. Cat sells an upgraded "spring kit" for the fuel transfer pump (the original springs were notorious for being "weak"). It's a 5 minute job to replace that spring.

Don't let them sell you a new "fuel transfer pump", just the spring kit. Don't let a dealer "charge" you to connect their computer to your truck, either...the Cat ET program will NOT tell them the actual fuel pressure! It has to be checked with a gauge. Good luck!
paul

Albuquerque, NM

#78 Jul 29, 2012
i have a c15 that dies intermitently the code it code it keeps throwing is engine pid 122 open circuit i was told the ignition switch was bad it was replaced engine still dies if you turn on the jakes and rev it up then let off the throttle the jakes come on and throw the code they cant seem to find any thing wrong they did find a wire all most cut thru and thru i think it was on the # 1 pin to the ecm it was fixed but still dies
roger morris

United States

#79 Oct 15, 2012
I like your advice. I been wondering about my spring in my pump I stretched a little and it seem to help it. Ill get the up grade thanks

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#80 Oct 16, 2012
roger morris wrote:
I like your advice. I been wondering about my spring in my pump I stretched a little and it seem to help it. Ill get the up grade thanks
If you want to shim it yourself, read my post under "C-15 runs rough" :)
greg73l

East Aurora, NY

#81 Dec 5, 2012
i have a 04 c15 that has a high fuel psi problem it has burried a 200 psi guage i have checked everything new filters, return lines, check valves in the fuel filter housing, truck always had around 120 psi after installing a shim kit in pump regulator, seems to be lacking a little power, im stumped
David

Red Deer, Canada

#82 Dec 13, 2012
C15 550hp. Engine temp climbs up over 200 and cab air gets cold. Engine won't cool down until truck is stopped
Ken

Marion, IN

#83 Dec 14, 2012
David wrote:
C15 550hp. Engine temp climbs up over 200 and cab air gets cold. Engine won't cool down until truck is stopped
One of three things...low antifreeze level in radiator, or thermostats stuck in the "closed" position, or the water pump is not turning fast enough. Sometimes the shaft pin shears off inside the water pump, but it doesn't leak out the "weep hole" to tell you that the internal seal is bad.
Dan

Sikeston, MO

#84 Dec 28, 2012
Hey guys, I have a '01 C15 that has acquired a minor miss at low idle, not all the time, comes and goes, still seems to pull fine and if the engine is idled up it is fine, just a small miss and faint blue smoke from the stacks when it happens. 2 days prior to this the truck gelled up on me and I changed the fuel filters to a Wix filter. I have read that the C15's are really fussy with after market filters, is there any truth to this? Has this happened to anybody else out there? The fuel pressure does seem to be a little off from where it was a week ago, not much maybe 10psi at the most. I did get the Cat filters for this truck and am planning to try this befre I take it to Pete or Cat

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#85 Dec 29, 2012
Dan wrote:
Hey guys, I have a '01 C15 that has acquired a minor miss at low idle, not all the time, comes and goes, still seems to pull fine and if the engine is idled up it is fine, just a small miss and faint blue smoke from the stacks when it happens. 2 days prior to this the truck gelled up on me and I changed the fuel filters to a Wix filter. I have read that the C15's are really fussy with after market filters, is there any truth to this? Has this happened to anybody else out there? The fuel pressure does seem to be a little off from where it was a week ago, not much maybe 10psi at the most. I did get the Cat filters for this truck and am planning to try this befre I take it to Pete or Cat
The Wix filter will work OK for about 5 weeks, then they tend to plug up. We used to use them on our C-15's, but I switched to buying Fleetguard fuel & oil filters from KW. We change all our fuel filters on a 4 week interval anyway, so it really doesn't matter.

Fuel pressure readings drop when the fuel temperature is cold. Check it again after the tanks have warmed up. What fuel pressure are you showing at an idle? Should be 65 to 75. If it's much lower than this, it's possible that the spring inside the fuel transfer pump is weak. Low fuel pressure will cause the "miss" you're describing, and also an injector will cause this when it's starting to fail...releases insufficient fuel to "fire", then sprays too much in the next time, causing the "blue smoke"!
Todd

Groton, SD

#86 Dec 29, 2012
I have an 03 c-15 in my t-600. Problem is it only pulls from passenger tank most of the time. Have replaced both suction and return lines, crossover valve underneath the cab and filters. Any other suggestions on what my problem could be?

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