What is a injectors life span?

Whiskey · **Posted:** Sat May 31, 2014 12:05 pm

I realize there are many factors that play into this, but does anyone have an estimated life expectancy for the injectors we use? I took my Liberty in and got the timing belt and all that stuff replaced and had the mechanic take a listen/look at a unsettling wobble that the engine gets if I'm in park or neutral and rev to about 1800 rpm. Between that and the fact it makes a decent blue smoke screen when cold starting he came to the conclusion that one or more of the injectors are probably worn. I've got 168,000 and change on it now and over the last few months it definitely has lost some power and acceleration response.

papaindigo · **Posted:** Sat May 31, 2014 1:58 pm

Absent an external reason for wear injector life should be nearly indefinite. Can I assume your timing belt job was done back around 100,000 miles, if no park instantly until done.

Please be a bit more descriptive than "wobble". For example if by wobble you mean physical engine wobble I'd bet on motor mounts way before injectors.

As to blue smoke on cold starts that's typical diesel not anything to worry about although a good shot of diesel injector cleaner might help. If you want the smoke to mostly go away invest in a GDE tune.

Hexus · **Posted:** Sat May 31, 2014 2:40 pm

The "Wobble" is probably a motor mount, they're known to crap out.

Highly doubt it's an injector. Very Highly.

I would say either Motor Mount or Alternator Decoupler 100x before an injector.

Whiskey · **Posted:** Sat May 31, 2014 7:28 pm

When I had it in the shop two weeks ago I had them put in a timing belt, tensioner, idler pulleys, water pump, rollers seals, camshafts seals and large gasket for the crankshaft sprocket (kit from IDparts) and they put a crankshaft seal in it because it was seeping a little oil. When I say a wobble I mean the engine feels like it's playing jump rope with itself. The whole jeep is waging around like something came out of balance. I'll give it a little more throttle and it will hold at 1800ish for a second and then jump to like 2000-2100 and smooth back out. While this is going on there is a light blue smoke coming out of the exhaust. I have the ECO Tune and I replaced the alternator and serpentine belt a month and half maybe two months ago. The engine mounts I'm accustom to working with are silicone filled, is that the same case with these? I've looked at them and a mechanic has looked at them and they aren't cracked and don't appear to be severely compressed. Is there something else I should be looking for to indicate wear?

GreenDieselEngineering · **Joined:** Sun Jun 07, 2009 5:10 pm **Posts:** 1111

Could be improper timing or a failed rocker arm as well. Both would lead to the misfire feeling you have.

Whiskey · **Posted:** Sun Jun 01, 2014 2:22 am

I would agree with the mistiming, but they supposedly retimed it when they did the timing belt and also it was doing this "jump rope" thing before and after it went into the shop so I don't think they modified anything while working on it. This has been a recent thing so a rocker would make sense. I saw on here one time (and have not been able to find since) air flow rates to give a rough idea if a rocker is going out, does anyone have those or know where I could get them? I want to say 16 or 18 g/s was good and anything below 14 or 12 g/s was bad, does that sound right to anyone?

thermorex · **Posted:** Sun Jun 01, 2014 2:36 am

I think Keith said stock new the crd has 18.2g sea level and below 15 rockers are trashed.

Whiskey · **Posted:** Sun Jun 01, 2014 11:03 am

My jeep is sitting at 670ft msl right now, does anyone know what the g/s altitude correction is per foot or 100ft?

Whiskey · **Posted:** Sun Jun 01, 2014 3:44 pm

I just went and took a look at the mass airflow rate and it was reading between 18.9 g/s and 19.2 g/s. What that translates to at this altitude I don't know. I took some video of the start up and then under the hood for sound purposes.

https://www.youtube.com/watch?v=57d6WbD0msQ

https://www.youtube.com/watch?v=CfLFx6TVm7E

GreenDieselEngineering · **Joined:** Sun Jun 07, 2009 5:10 pm **Posts:** 1111

airflow seems good. It may be an exhaust leak in the EGR piping or exhaust manifold. Is the catalyst still in the exhaust? It does not sound much different than a normal CRD based on the video clips.

Whiskey · **Posted:** Mon Jun 02, 2014 1:42 am

It's going in for some body work in the morning, so I'll take a look at the EGR piping and exhaust when I get it back. I actually just put a new cat in it back in April, all the idling I had to do over the winter I think did it in.

jthomas999 · **Joined:** Mon Jan 16, 2012 11:51 pm **Posts:** 98

I had mine tested at 261,000 and they all tested bad. I think I am going to get my new ones tested in about 200,000.

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Whiskey · **Posted:** Sun Jun 08, 2014 6:12 pm

Got the Jeep back from the shop Friday, and did a little looking around today and couldn't find anything that jumped out at me saying the EGR piping or exhaust manifold is leaking. However I will do some more looking next weekend if I can. I did spin the engine up to the RPM that I was getting that "jump rope" feeling at and it didn't do it today. It ran just fine, linear response from the engine, however I didn't drive it today, just moved it so my landlord could get at the garage and then it sat for 3 hours or so. What ever this issue is I'm sure will be back though. While I'm here does anyone know what a baseline for the fuel pressure should be? I pulled these numbers Friday after coming home from work: Intake Temp 114.8F Boost -0.2psi MAF 17.2g/s Fuel Rail 4971.9 (was fluctuating to just over 5000 a bit) 761RPM Coolant 150.8F. Outside air temp was about 70.

Diesler · **Joined:** Sat Oct 26, 2013 11:51 pm **Posts:** 8

Had my injectors tested recently while doing rocker/lifter/cam-shaft/TB. Injectors were well within spec. @ 175K miles.

diesel_guy86 · **Posted:** Thu Jun 12, 2014 11:18 pm

I think my rail pressure is right around the 5,000 psi mark. My injectors tested fine at 148k miles.

WolverineFW · **Posted:** Fri Jun 13, 2014 8:48 pm

No quite at 100,000 miles yet. Had my injectors tested at a Bosch shop while they were out. Tech said they tested better than some new injectors do....operating like brand new.

flash7210 · **Posted:** Fri Jun 13, 2014 9:09 pm

If you consistently run good fuel with good filters, your injectors should last a really long time.
Adding some PowerService or TCw3 to the tank doesn't hurt either.

Whiskey · **Posted:** Sun Jun 22, 2014 9:55 am

Did a round trip to Southern WI last weekend and the jeep ran pretty well, but it still didn't feel right and sounded funny. On the way back I defiantly noticed it more being there was less traffic to have to deal with. With the cruise set at 70 every once in awhile over a 5-10 mile distance the engine would progressively start feeling boggy and started sounding like a two bladed helicopter (if anyone knows what a Huey sounds like, it was similar), then it would hold for a little bit and fade back out and get it's strength back again. I never lost power, it just didn't have the get up it should. Then earlier this week I was heading to work and pulled up to a stop sign and heard a pop like sheet metal would make when it flexes (it wasn't sheet metal though), pulled away from the stop sign and had full power. 3/4 of a mile later went up a hill and it was boggy again. Top of the hill, stop, turn, wait for light, turn, stop at light and when I pull away it's boggy then for about 2 seconds it springs to full power and then bogs again. I don't know at what point it was this week but I have full power now. The way it was acting I would say it wasn't getting either enough fuel or enough air. Has anyone had problems with the turbo vane actuator sticking? If it is sticking could it somehow be causing my smokey start ups in the morning? I'll try pulling the vacuum line from the turbo and see if I can see the rod move.

DFWBIOFUELS2 · **Posted:** Sun Jun 22, 2014 9:45 pm

That sounds like fuel starvation or air in your lines. Have you tried to bleed the fuel filter head? You might want to look into a lift pump for your setup.

diesel_guy86 · **Posted:** Sun Jun 22, 2014 11:08 pm

Said he heard a "pop" could the fuel tank not be venting correctly? Easy test would be to do a drive with fuel cap removed.

What is a injectors life span?

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