well long story short i just put a rebuilt engine in a truck for a guy , got it all in , started right up , i wnet about 5 min down the road and shut it off to go into to safeway and come out truck started right you , then it stalled wouldn't start , so a towed it back to the shop and checked some stuff , fuel pump is working , new fuel fitler 2 miles on it, fuel is clean no water , i have fuel at the CP , and at the injectors , but no running truck , i pulled codes

p2509 ecm/pcm low power input signal intermittent

p2607 b air heater low input

i have the batteries on charge , and i going to check all the grounds and clean them all again as i just did when i put the enigne back but am at a losss hear ,,,,, any help would be great thanks guys

 

Sounds like a ground issue,, or the connection to the fuse box for the ecm,,, try that see what happens

 

ok thanks ihope it's something easy . i want this thig gone today and payed for it

 

Might be a bad connection in one of the harness plugs too. Doesn't take much for the ECM to quit. There were probably alot of plugs to connect when you did the swap, maybe one got a piece of crud in it???

 

i did all the grounds and added some more , and cleaned everything all connections . now i have no codes , but the truck still won't runn . i cracked open the injector line and i have no pressure there , so does that mean CP3 is no good ??????? is there a way to check it ? are any other things i can try , i do have lift pump pressure at the cp3 . just no high pressure at the injectors just about the same as lift pump pressure .

 

Rob, how much pressure do you have at the inlet of the CP?

 

Does it have a rail pressure gauge? The rail relief valve could be stuck wide open. I am not to sure how to check it other than taking the return line off and seeing how wet it is. Or cranking it over while the return line is off and see if fuel shoots out of it. Or maybe its the FCA not sure how to check it though other then swapping it out, I know though if you unplug it, it will pin the rail pressure gauge while idling. Also check the connection on the rail pressure sensor it can make it do weird stuff as well. All of those problem usually set codes though.

 

i can pee harder , i un did the line when i had a guy roll over the engine and it had almost no pressure coming out and i know that it should come out alot hard the that at the injector line as it has really high pressure there ]]

i know if i roll the engine over i you can't smell burnt fuel so i know it's something fuel

 

I had a friends truck loose an injector (dumping fuel back to return) it had no codes (mechanical failure vs electrical issue) he would have to crank the living crap out of it before it would start, 30seconds to a minuite of cranking before the c3p could build enought pressure for the engine to fire..when it did start it had a noticable miss and one cyl was cold, when placing your temp probe(AKA your finger) on the manifold.

there are tests to confirm/fail an injector, but I dont remember how to

 

Is the lift pump working? Can you hear it?

I don't know if they put in a in-tank lift pump for that truck. I bet that your lift pump is on its last leg or you got a suction screen on the fuel pick-up/screen module plugged. Been there.

 

Darn these electronic vehicles...What a pain...Even Merc had electronic injection systems starting in 1974 to 1976..So much problems that Bosch with back to a full mechinal injection system(CIS) in 1977.

 

ya it's working as it should , just no rail pressure

 

i know i want to burn it

 

I copied this froma another site, might help you out.


2 tests you need to do when diagnosing a no start on a commonrail.

1. test flow from the IP supply line to the commonrail while cranking (10 sec intervals). You have to slide a hose over the banjo fitting to get it directed into a container. You should get 70ml in 30 seconds. If you don't proceed with step 2

2. Remove low pressure fuel supply line from IP (CP3), bump the engine over which will cause the lift pump to run for 25 seconds, you should get 1.8l from this line in 30 seconds. If you do suspect FCA or internal IP problem.

If you do get the 70ml from the IP you know low pressure supply is good and there is no need to test it.
You also should remove the return line from the rail and slide clear hose between it and the regulator, You should not be getting fuel unless rail pressure is very high, the FCA job is to control pressure the regulator just limits it.

Now if everything checks out chances are you have a faulty injector (S) or contaminated supply tubes. Since all injectors run in the same conditions (fuel supply, pressure and oils are identical) one can assume if one is worn out the others can't be to far behind. I change all 6 when I get a no start. I also check for contamination on the supply tubes and injector body's. If any rust is noted drop the tank remove the lift pump, clean out the tank, put in known good fuel remove and clean all the lines, drain the filter housing and install new fuel filter. (not in that order, use common sense here to avoid contaminating clean lines). I also reccommend an upgraded filtration system on the fuel side as the dodge system is inadequate.

 

Can you measure the fuel pressure to the CP3? Going to be around 10psi +/-, if thats okay there is a high pressure fuel leak in the system. CP3, injectors, valve on the rail. Maybe the CP3 has crapped out, leak between the tubes to injectors, or the rail valve is done. If you crack the lines on a common rail, all pressure is lots, so it wont start. Do you have anyway to measure rail pressure? To check for leaks in the system, need to check return fuel for all 3 circuits, but need to increase rail pressure with computer.