300Tdi rough idle
- Thread starter chris snell
- Start date
RDavisinVA
Technical Excellence Contributor
You can use the poor mans pop-tester, by removing one injector at a time and holding a coffee can under it when it is reconnected to the hard line, but not installed.
You'll be able to see the spray pattern and catch the sprayed fuel in the can, but to do this you have to run the engine on 3 cylinders.
If you try this be sure and wear safety glasses and do not let the sprayed fuel contact your skin.
You'll be able to see the spray pattern and catch the sprayed fuel in the can, but to do this you have to run the engine on 3 cylinders.
If you try this be sure and wear safety glasses and do not let the sprayed fuel contact your skin.
If you mean a 12V fuel pump, yes, I have one inline. I don't think I have a fuel system issue on a macro level.
broncoduecer
Technical Excellence Contributor
Is there an actual torque spec for the fuel pipe flair nut on top of the injector?
The water pump failed. Bearing had seized and it was shreaking.
Lift pump is fine, plus I run 12V fuel pump. I will check the IC pipes but I don't think that's my problem.
I'm leaning towards motor mounts right now. I have shitty Allmakes mounts and every other rubber Allmakes product has already crapped the bed at 22K miles on this rebuild so it wouldn't surprise me if the mounts had, too. I am going to put some Genuine ones in.
Lift pump is fine, plus I run 12V fuel pump. I will check the IC pipes but I don't think that's my problem.
I'm leaning towards motor mounts right now. I have shitty Allmakes mounts and every other rubber Allmakes product has already crapped the bed at 22K miles on this rebuild so it wouldn't surprise me if the mounts had, too. I am going to put some Genuine ones in.
NPT90
Well-known member
There is also the harmonic crankshaft pulley.
Check this out
if your water pump seized it could have caused the separation/death knell for the rubber around this pulley.
ERR2220 shown here
Check this out
if your water pump seized it could have caused the separation/death knell for the rubber around this pulley.
ERR2220 shown here
DefendersNW
Well-known member
Changing motor mounts are not going to fix a rough idle - just change the frequency of vibration into the chassis. If the rough idle is observed (not just "felt") then you have another issue.
start with the basics, fuel and oil condition, filters clean, valves adjusted correctly, fluid/air piping seals good.
Then onto secondary - TIMING, injectors, IP, fuel return, lift pump, tank pickup (screen?) - air system (no leaks post turbo under pressure, and no excessive oil from cyclonic breather into IC.
DefendersNW
Well-known member
Chris, you should buy these, but it is not going to fix your problem.
Lots of things to try. Brian's list is a good place to start. Need to verify timing for sure.
1of40
Well-known member
Bought them from Safari HP. Stephen Peters uses them exclusively on 300tdi builds.
Jeff B
Well-known member
NPT90
Well-known member
Those will work on 200TDI engines and LT/77 combos not the 300TDI.
might be a mis-communication
Update: put a new fuel filter on today and drained the sedimenter, then bled the system thoroughly using my inline 12V pump and the fuel filter housing bleeder screw. Seems more about the same. I'm going to change the air filter and check all of the intake and IC hoses. I feel like there is noise coming from the vacuum pump region and I do have a spare pump. I'm not sure if the pumps will cause shaking or loud noises when they go bad. Braking has been mushy lately.