Hard Start ... What Next?

[bbsmith]

120,000 miles

New batteries

New Fuel filter

Glacier lift pump

Grid heater OK

Cross tubes re torqued

All injectors removed, tested and re-installed.

Still starting very hard at @ 30 f.

will not start at all without either below 20 degrees unless I plug it in.

Even during the summer, it was extremly hard to start after sitting a few days.

Any idea what to check next?

 

[p-Bar]

Any way to monitor rail pressure?

 

[bbsmith]

No, I have a Bully dog PMT but it dont monitor rail pressure.

 

[jelag]

The fuel pump doesn't run in the crank position... try this... turn the key on, let it set for 20 seconds and turn the key off... . than turn the key on again for 10 seconds and than crank it and see if it starts... . If it fires right up... you've got an issue with the fuel draining off the rail, when the truck sits... and you don't have full fuel pressure... .

The key on, is running the fuel pump and recharging the system and removing any air that might be there... . if the truck starts, than you just need to find out how and why the fuel pressure is bleeding off...

Hope this helps. .

 

[TCDiesel]

Injectors are bad, Did you mention to the company that claim they tested the Injectors, it was for NO start condition?Almost always when using either and starts and runs normal Injectors are bad,CR Injectors Need XXX pressure when starting,bleeding of to much they will not inject fuel when cranking. Sending CR Injector(s) for testing is a waste of Money and Time... they can be throughly tested in the Host Motor. its to common for these companies claiming they have the technology for NO start ability when they don't have it,each injector would have to be tested individually with some type of explosion then meter,this would need to be performed under several different conditions and temps.

 

[bbsmith]

jelag..... Tried that today after setting @ work for @ 8 hrs. @ 40 degrees outside. Still cranked for a good 15 or 20 seconds before starting.

 

[bbsmith]

TC The company was aware of the no start problem. only the # 4 injector required some minor repair. The tech said that he did'nt believe that the injector was bad enough to cause the problems. I dont know nothing about the tester exept that the mechanic had used them several times in the past.

I guess the question is what should I do next? How about the check valve? should I replace it or just start replacing injectors.

Realy starting to get frustrated!! I realy appreciate your help.

 

[TCDiesel]

I here Ya,CR Injection system is complex and does NOT conform to Logic,I just get upset B/C I deal with this deception everyday. I have sold over 3000 injector,and at times a deal with the R/R that companies are claiming are good,If you spent 5 minutes with Me on the breaking down of 1 CR Injector You would see why I am so adamant about testing. If the company was aware of the NO start they should have help with the several tests in the host Motor. Once you get it narrow down to the injectors,then its up to to the Owner weather or NOT to bench Test. O buy there way I can assemble 5. 9 CR injector with both eyes closed..... He. He... ... .

 

[Wingate]

Get a cap and individually plug the injectors off one at a time... It WILL take time, but ther is no replacement for good diagnostics if you don't want to hurl parts at it. Just put the cap on a different injector each afternoon fire it up for a second to get the air out, then attempt a start the next morning. That will rule out injectors without removing them. After that, you MIGHT consider a relief valve cap, just DON'T leave it on there permanently.

 

[DBraswell]

maybe a cam sensor

 

[Mikey-KE7LBB]

Outside of the obvious hard start condition if any air is present or low/no fuel pressure, it could also be an issue with one of the temp sensors not reading correctly. Maybe giving the ECM a bad reading and not providing enough timing advance to allow it to fire off??



Just throwing out a couple of ideas since I know these trucks can start WAY below zero without being plugged in

 

[bbsmith]

what I need is a good reliable mechanic in the chillicothe Ohio Area //////Anybody?

 

[MMeier]

My $$$ is your injectors are shot. Like TC said, they do not confirm to logic... what type of "minor " repair did they do to that one injector ?

 

[bbsmith]

Heres what gets me... ..... Just went into my unheated garage. after 4 days, plugged it in for a couple of hours and it fired right up. WTH

 

[bbsmith]

That I dont know. I am lost when it comes to the fuel system. I'm going to find out though

 

[TCDiesel]

Its Injectors,the tolerance's are so close when then get warm they will start, if they get to hot then the long crank ensues.

 

[GaryOwen]

I'd check the grid heater again. I was having similar problems in the fall and after checking the voltage to the grid heaters, I found I was only getting about 3 volts. Cleaned all connections and was back up to normal.

 

[bbsmith]

Thanks Gary, Thats one I havnt tried.

 

[bbsmith]

Ding Ding Ding... ..... and the winner is ... ... TCDiesel!!# 6 injector. Just had to find a shop that knew wtf they were doing. Thanks for the advice everyone, especially TC. I knew what questions to ask.

 

[g_dog1]

I was following the thread. Nice to see a conclusion. How did the shop determine it was #6? Did they just use an injector kill test, cylinder contribution test, or did they cap all the injectors individually and try starting, or did they cap the injectors and measure flow return?