Injector issue
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Elder User
Joined: Jan 2009
Posts: 576
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From: Oneida, NY
Injector issue
So after replacing both oil pumps 3 weeks ago now the mechanic says an injector is leaking oil through and thats causing my truck to not start. He says he can't test to find out which one it is. Is there anyway to figure it out? I don't think i can swing all 8 injectors, However Clay @ riff raff has been helpful and i will buy from him if i can afford it.
Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
Did the mechanic tell you to replace both oil pumps? If so, is he just taking a stab at it being a leaking injector? I'm not throwing stones just not a fan of throwing money at possible fixes. If it is a leaking injector, couldn't you just replace the o-ring on the injectors or the o-rings and the cups. Cups should only be about $300 and not sure what o-rings would cost.
Just asking, although there could be more to the story that I'm not getting or know.
Just asking, although there could be more to the story that I'm not getting or know.
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Elder User
Joined: Jan 2009
Posts: 576
Likes: 0
From: Oneida, NY
No he replaced the LPOP first and the truck started and made it a mile or 2 and then quit. SO he tested the HPOP and said that it was bad. The truck ran the best it has ever ran for the last 3 weeks but now it has trouble starting... or doesn't start.
I don't know enough about these diesels to answer your question and i need my truck BAD!
I don't know enough about these diesels to answer your question and i need my truck BAD!
Thread Starter
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Elder User
Joined: Jan 2009
Posts: 576
Likes: 0
From: Oneida, NY
So i just called him and told that its an unacceptable answer and he told me he doesn't have the proper stuff to test them and he can send them to another place and they will test them.(2-3 days out the guy is) I just don't understand how it really works so i don't know what to do. He says that oil is leaking thru an injector and causing it to not build enough pressure to fire the motor. Sound right??
Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
By no means am I mechanic but to say it's leaking oil through the injector with pulling them and looking to see if it is cracked. Have you had an injector buzz test or cylinder contribution test done yet? If so how did they do? Any codes? I will to bet if your losing oil from an injector it an o-ring that has gone bad.
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Elder User
Joined: Jan 2009
Posts: 576
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From: Oneida, NY
They said they did a buzz test before oil pumps were replaced and it was good. not sure on the cylinder contribution test. No codes
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Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
So after replacing both oil pumps 3 weeks ago now the mechanic says an injector is leaking oil through and thats causing my truck to not start. He says he can't test to find out which one it is. Is there anyway to figure it out? I don't think i can swing all 8 injectors, However Clay @ riff raff has been helpful and i will buy from him if i can afford it.
Your mechanic needs a good scan tool to run some more tests. I can only presume that he/she has one because it's nearly impossible to diagnose a bad HPOP without a scanner that is designed for these diesels. Did you get your old HPOP back? If so, don't throw it out because there probably isn't anything wrong with it.
A buzz test will likely pinpoint an injector that is pissing oil.
Ask your mechanic what the ICP pressure is while cranking. Also need to know the duty cycle of the IPR,, engine rpms and vehicle voltage (all while cranking). If your mechanic can not determine these things then you really should find one who can (or buy AE for your laptop and we'll show you how to do it yourself...)
Last edited by Shake-N-Bake; Jul 14, 2011 at 05:44 PM. Reason: corrected spelling
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Laughing Gas
Joined: Feb 2004
Posts: 1,080
Likes: 1
From: Elsinboro, NJ
I'm not saying they didn't do it but why wouldn't he buzz test it again especially if they think it's a bad injector?
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Injectors can fail in such a way where they are pissing oil. When that happens, it can cause the engine not to start. You can validate by removing the valve covers and watching the discharge nozzles while cranking. Unplugging the ICP may also allow the engine to start if the injector is not leaking too badly.
Posting Guru
Joined: Jan 2007
Posts: 2,364
Likes: 3
From: Gilbert Az.
That's $80.00 of o-rings to do all 8! I really think your getting guesses and not repairs! It is possible that you had a leaking o-ring the entire time, and he has just been increasing oil volume to compensate until it completely failed, as Greg said all it takes is a comparable scan tool or a look at the discharge ports to rule out.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
If the upper o-ring is faulty, then you might see oil coming out around the base (where it enters the cylinder head).
If the middle o-ring fails, then you will get oil mixing with fuel and probably some smoke out the tail pipe...but the engine should start.
So, if your mechanic says an injector is leaking oil and believes that is why the engine is not starting then what he is really saying is that ICP pressure is very low....like 60-80 psi max. ICP pressure of 180-250 while cranking usually points to the IPR valve (which is why some mechanics change the HPOP by mistake...)
Thread Starter
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Elder User
Joined: Jan 2009
Posts: 576
Likes: 0
From: Oneida, NY
So this is a lot for me to take in. What should i do? He took all the injectors out because he was going to send them for testing. Should i inspect them and make sure there is no cracks? then replace o rings and have him put them back in? or should i have them tested?
Edit: Thanks for explaining this to me i understand it a lot more now.
Edit: Thanks for explaining this to me i understand it a lot more now.