Help.. Tdi Suddenly running really rough - Defender Source
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  #1  
Old November 10th, 2009, 01:01 PM
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Help.. Tdi Suddenly running really rough

Was driving on the highway at about 50mph when the truck suddenly lost power and started running on 3 cylinders or so it appears. No strange noises or anything. At Idle, its realy rough and appears to be running only on 3 cylinders. ITs also smoking a lot even at Idle.

Any Ideas?
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  #2  
Old November 10th, 2009, 01:16 PM
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Have you checked for fuel blockage or contamination (H2O)?
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Old November 10th, 2009, 01:16 PM
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What color is the exhaust? You don't put many miles on, but how often do you replace the fuel filter. I've had fuel problems show up remarkably quickly - i.e. the truck is running fine and within 20 miles it needs the filter replaced.
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Old November 10th, 2009, 01:17 PM
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I'm sure that we can skip the obvious recommendations with you Randy. What have you checked so far?

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Old November 10th, 2009, 01:18 PM
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First thought... Don't run it untill you check your timing, the belt may have slipped or stripped.

Next I wouldlook at fuel delivery, filter and injectors

good luck
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Old November 10th, 2009, 01:31 PM
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My bet would be injectors. i had something similar happen on a highway run. Do you run any sort of additive in your fuel?
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Old November 10th, 2009, 01:37 PM
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Quote:
Originally Posted by Cirbo
I'm sure that we can skip the obvious recommendations with you Randy. What have you checked so far?

Jim
I'm not trying to insult Randy...
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  #8  
Old November 10th, 2009, 01:56 PM
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Ok... here is what I found so far. Number 1 injector/cylinder is not firing. I cracked the lines while at idle and the first one had no effect on the engine. The other 3 when cracked caused a major drop in the idle. Other then that, it seems to be running smooth just on the 3 cylinders so I dont think its the belt at all.
This is the engine in my dads truck. He uses it every day. But it only has about 3k on it since the rebuild. My guess would be the injector. Should I remove it? what should I look for?

Follow-up Post:

I have never had water of fuel problems before and I dont run any additive by the way
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Old November 10th, 2009, 01:59 PM
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Quote:
Originally Posted by JimC
I'm not trying to insult Randy...
No offense meant. I was typing at the same time you were Jim. I actually appreciated your input, as I was just wondering when I changed my filter last.

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Old November 10th, 2009, 02:09 PM
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You would need to take the injector to diesel specialist to test it. I would certainly recomend running a diesel additive, especially in winter. Optilube XPD is the shizzle of them all, DM runs it as well as I and I constantly get comments about how my engine does not smoke or smell. Helps cold starts and water dispersion too.
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  #11  
Old November 10th, 2009, 02:14 PM
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Does it sound like just the injector? How the hell would that think get clogged. It has a new filter and everything.. WTF
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Old November 10th, 2009, 02:17 PM
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Would it help the troubleshooting process if you swapped the injector to another cylinder? This could eliminate an IP problem.....?
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Old November 10th, 2009, 02:40 PM
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Have you whipped the rocker cover off? could be a broken rocker, or one of the valve caps fallen off, giving massive valve clearance on that cylinder and not combusting properly?
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  #14  
Old November 10th, 2009, 02:43 PM
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I will check that as well Jim. Should the injector come out easy? I guess you just take the hold down clamp off and lift up right?
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Old November 10th, 2009, 02:48 PM
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Quote:
Originally Posted by TDI Guy
I will check that as well Jim. Should the injector come out easy? I guess you just take the hold down clamp off and lift up right?
It should come out easily.....


quite often a slide hammer will help a lot. Get a nut that fits the injector thread (300Tdi's are M16 if i remember right, so the 200's should be similar) then i welded that nut, to another nut that fitted my slide hammer, they came out a treat then.

undamaged too.
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  #16  
Old November 10th, 2009, 03:58 PM
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I will let you guys know. ITs a brand new head and injector so I will hope for the best..
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Old November 10th, 2009, 04:08 PM
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Just swap that injector onto anther cylinder and see if that cylinder fails to fire.
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  #18  
Old November 10th, 2009, 04:13 PM
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You might want to have a look at the harmonic dampener, If it's wobbling then there is a chance the keyway in the lower timing pully is whacked.

We had this problem in Grahams truck and the symptoms seem very similar.
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  #19  
Old November 10th, 2009, 04:37 PM
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but...wouldn't that affect all cylinders?

btw what was the cure for that? new crank?


Quote:
Originally Posted by revor
You might want to have a look at the harmonic dampener, If it's wobbling then there is a chance the keyway in the lower timing pully is whacked.

We had this problem in Grahams truck and the symptoms seem very similar.
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  #20  
Old November 10th, 2009, 05:29 PM
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Just took the rocker cover off... Found the problem. Had a broken rocker adjuster screw. Was very lucky. the parts were just sitting in there.

Follow-up Post:

can you believe this? I can't
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