aaz runing rought at ~2000 rpm

[TylerDurden]

I'd also look at boost level at the point of trouble.

I would suspect the IP has some issue with the governor or enrichment linkage, but the injector testing is a good start to narrow the variables.

[vako]

today i noticed that when the engine is cold and i just start to move problematic rev range is quite narrow. but as the engine warms up the range starts t increase up to 800-1000revs maybe. i dont even know what can be causing temperature depended problem.

i've been searching for faulty injector symptoms all day long and did not find anything that would be informative for me...

will wynns diesel purge be able to clean nozzles if they are clogged?

i looked at my IP rebuild pics now 9rebuilt it lats winter). governer was assembled as it was before the rebuild, it only had one broken lever inside the pump (maybe that is a lever for air conditioning high idle), and also the broken piece was not in the pump

[bbob203]

Modify the governor while your in there!

[vako]

i was thinking about the governer mod when i had the pump apart. but in the mud sometimes you need to have rev limiter which is gone after the mod

[745 turbogreasel]

yes it does it in neutral too. but in neutral you can only see the engine move from side to side a bit, it is not felt while sitting in the car

You might be able to isolate it to one injector or delivery valve by swapping things around and running with one disabled.

[vanbcguy]

The rev limiter is still there - I used a small shim and mine kicks in at about 4500 on my 1.6td. I don't think it will rev over about 4900 no matter what - at least I've never done it. Hmm... Maybe now that I'm done with the engine.....

[8v-of-fury]

Stock governor should hold the engine at ~5350 with the foot to the floor in neutral from factory.

If you have modified the assembly to make the springs stiffer, this number will surely be higher.

[vanbcguy]

Yeah I was talking about in gear pulling the car...

[8v-of-fury]

I don't think it will rev over about 4900 no matter what - at least I've never done it.

And I read your mind how?

[vako]

a little update, today i had my injectors tested...   all of them were at 145  only second injector had changeable and not perfect spary pattern. but after 10-15 minutes of polishing paste spray pattern became almost perfect. mechanic said that there is no way this injector could be causing problem like yours.....  after assembly car run just the same  no changes at all.

internal pressure is good, timing is set to 0.95-1,00 milimeters. it pulls just fine.....   the only problematic thing left in transmission is the dif. yes it has whining noise but could it be causing the issue.... 

[theman53]

If it will do it in neutral everything in the trans and transfer case is not relevant.

[8v-of-fury]

I disagree, maybe not the diff..

But in neutral with clutch out the trans is still turning shafts and such.

Have you tried with the cl7tch in and the car not moving??

[vako]

i've spent more than 600-700 $ on this engine and pump rebuild already (+ 600 $ for the engine itself ). a'm already thinking of leaving it alone    only option left (that will probably not change anything) is to increase internal pressure.

another question that i have: can bad hydrolifters cause this? i have knocking lifters that seem to be worn, but can they cause things like this ? 

[Mark(The Miser)UK]

a little update, today i had my injectors tested...   all of them were at 145  only second injector had changeable and not perfect spary pattern. but after 10-15 minutes of polishing paste spray pattern became almost perfect. mechanic said that there is no way this injector could be causing problem like yours.....  after assembly car run just the same  no changes at all.

internal pressure is good, timing is set to 0.95-1,00 milimeters. it pulls just fine.....   the only problematic thing left in transmission is the dif. yes it has whining noise but could it be causing the issue.... 

Has your mechanic actually witnessed your problem and concurred, or is he just going by your description?

Let's take this a step further... Do you have a camera that you can do a sound recording with?
If so can you place it about 4ft in front of the car [hood down] and record the engine at idle and then up to shudder point and just the other side.  Link us to it and I'll see if anything shows up on that spectrum thingy of mine...

Do a video of the same but with hood up and looking at the engine...

[vako]

sorry for my late reply, after injector check i had injector leaking problem and after resurfacing the mating surfaces of nozzle and other injector parts wit fine sandpaper leaking problems went away


but twitching problem is still there. i even notice taht car doesn't run well on idle. it doesent misfire but i can feel that engine does not run evenly.   even though at 5' celsius car starts without cold start lever and glowplugs after 2 hour rest... i will also check camshaft and IP timing in near future.
 added a bit of interal pressure to the pump (so that "marble noise" is heared just a little bit in middle range). a am also planning on making internal pressure gauge to set the pressure as it is intended to be


in few days i will post audio files as MARK Uk told me.


i also have one more question, can bad hydro lifters be causing this issue? i have noisy lifters but never heard taht bad lifters may be causing twitching or other problems in diesel engines.... :|