Heavy Equipment Repair Questions? Ask an Expert Now.
Wouldn't low fuel pressure effect all the the injectors not just 1 and 2?
the only thing on the back of the head is a plastic return line with a compression fitting
I thought mentioning the code 72 indicated that cylinders 1and 2 were involved . The fuel pressure in fine 65 to 85 psi. So we still have a code 72
I hear you on the high voltage system it could be a stretched wire
when the truck came to shop it running bad but no engine light I drove it in
the number one injector plug was broke so we replaced the harness .
now it still runs bad we have a J PRO and cannot run a snap test on the injectors so we changed then to a different holes. no codes on those holes
so we are down to the ecm harness or ecm is there any way to check the ecm Cat tells me 50/50 chance they can check it . and as you know the ecm and programing it not cheap please give us any suggestions we have not seen a bad ecm in a cat before may be this is the first will one driver die?
Will get back with you the ECM is at Freightliner being replaced and reprogramed we are installing a new ECM harness with new ECM when the ECM was pulled out it had oil in the plug . Thanks Sam
New ECM And harness fixed it , however it set all night and would not start this morning acts like air in fuel already had checked fuel pressure before
and was okay, thought regulator on back of engine okay from prior fuel test
It appears to not have come with a tranfer pump on the housing , And the regulator it not at a 10 degree tilt in the head can you get a transfer pump and could the tilt wrong cause the problem . otherwise we are putting a regulator on it .
Good morning .
we have changed the fuel pressure regulator on the head, change water temp sender because gauge did not work and changed air sensor.
drove it last night no problems , no problems on re start yesterday .
This morning it will not restart disconnected injector actuation circuit still no start , install fuel gauge have 35psi at filter , cranking speed on tach is 300 this problem comes and goes very little smoke at exhaust when cranking this problem only happens in morning it seems all injector orings have been changed new Cat reman head we used shell rotella oil 15-40 Thanks Sam
It is trying to start like it has air so they must be trying to fire when you say leaking injector do you mean the orings or leaking from the tip into the cylinder , would the speed sensor indicate a code ? and this problem comes and goes it started yesterday morning fine Thanks for your help
We changed all the injectors to Cat remands it start right up now We still have problem when you first drive off it smokes, after driving a block it clears up
then after letting it idle after driving it will smoke again when you drive off and will clear after a block . we have change the all sensors and the orings on the injectors are new. Thx Sam
No engine light , and our J pro tool does not let us cut off the injectors do not fee any mis fire. No codes
These Reman injectors are straight from Cat
Thanks for the information.
Yes i have used J Pro before, I wish it had cylinder cutout diagnostics. But it does not.
The reason I always like to cut each cylinder out is I may be able to isolate the smoke to one of the cylinders. If I can, I know that the one I find smoking has either a faulty injector or something wrong in the cylinder.
However I know you have inframed the engine and installed new injectors.
When you did the inframe, did you just replaced the pistons and rings? Or did you also have the block re sleeved?
Piston and rings and rods came loaded from Cat Block as you know is dry sleeved, checked with dial bore gauge all within good tolerance deglazed cylinders
We have followed vehicle down the highway zero smoke, 50 miles on it since inframe
Hey Sam. I just wanted to see how things were going.
Please let me know if you need more help or have more quesitons. I am happy to help.
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The Truck has been out on runs it cleared the smoke up alot with a oil change the oil must have gotten some diesel in it from the injector change
it still smokes on acceleratiton but clears up, could we have a bad turbo?
oil level is stable
coolant system holds pressure. Thanks Sam
I hope you had a great Thanksgiving!
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Hi we have sent the truck out now for several thousand miles ,
we still have smoke at acceleration then clears .
Thanks for the update.
Could you get me the part numbers of the injectors you installed and the engine serial number? I just want to make sure they gave you the correct injectors.