Stutter and shutdown.

[Steve0.adams]

I have a 92 24v Safari td42 silvertip, while on the way to work this morning I was slowing down behind someone who was turning. While slowing down the engine started to stutter like it was going to shut down. Sped up and everything was fine. Felt smooth and no weird noises. After work it started and drove fine. parked it for a couple hours then had to move it out of the driveway. It stuttered again and shutdown this time. It took a couple tries but it started up again and was stuttering. Seems like when the rpm's are higher it has no issues. I just changed the oil and filters. Any ideas on what might have caused this?

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[mudnut]

TDs are simple beasts. It might be the fuel pump or air leak in the fuel system or something similar. Hopefully a Diesel Guru can point you in the right direction.

[Steve0.adams]

Well, I changed out the oil. I suspect that the oil the shop put in was either not the correct viscosity or it was for petrol engines. It ran great for the first couple days. Then started shuddering. Once that happened I noticed that the oil gauge was reading almost nothing and would only go up when I was going up a hill at high revs. Didn't notice any excessive smoke coming out of the exhaust but it smelled like an old diesel heater. So based off of that, it was either my oil pump failed or I had a light weight viscosity oil. Changed it out with a 20w40 for diesels and my gauge immediately started reading I had oil pressure. Ranging between the 2 and the 4, idle and driving. I hope I caught it in time and caused no permanent damage. I did not see any metal in the oil. And so far there has been no significant shuddering.

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[nipagu7]

i believe the 4.2s have a small screen mesh filter where the fuel line goes into the injector pump and they can block up and they mostly get overlooked when servicing the car . when you take the fuel line off you have to look carefully as some people seem to not notice the mesh .

[Steve0.adams]

i believe the 4.2s have a small screen mesh filter where the fuel line goes into the injector pump and they can block up and they mostly get overlooked when servicing the car . when you take the fuel line off you have to look carefully as some people seem to not notice the mesh .

I already cleaned that out during a previous maintenance. But thank you for the reply.

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[Steve0.adams]

I'm back at it. Started to shudder again over the weekend. Oil pressure is fine. It seems to happen randomly. It can start up fine with no shuddering and the next it will shudder with rpm dropping to 300-400. As well as sometimes when I let off the accelerator while stopping. I did double check the gauze filter in the injector pump again. It had a few very small pieces of debris. My next educated guess is fuel filter and or injectors. Only issue is there are no parts available on Guam. Going to put in an order for injectors and fuel filter through patrolapart. In the mean time I will get a can of liqui Moly diesel purge to see if that will tide me over. Any other suggestions would be very welcome.

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[mihit]

Hand prime/pump to bleed air out of the fuel system as far as the injector pump. it should also show you if diesel is leaking past a hose connection etc. then you can start the thing and crack the injectors one by one to make sure they're bled up too.
i always suggest to fit an electric diesel lift pump to help the old girls out.

I guess also check the wiring to your fuel solenoid (lower side of injector pump) and make sure that is solid.

[mihit]

Oh, Manual or auto?? If auto then something-something TC or whatever. I don't deal with autos!

[Steve0.adams]

Hand prime/pump to bleed air out of the fuel system as far as the injector pump. it should also show you if diesel is leaking past a hose connection etc. then you can start the thing and crack the injectors one by one to make sure they're bled up too.
i always suggest to fit an electric diesel lift pump to help the old girls out.

I guess also check the wiring to your fuel solenoid (lower side of injector pump) and make sure that is solid.

Thanks for the suggestion I will bleed it when I get home. It is an auto.

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[nipagu7]

i don't think shuddering after lifting off throttle would be a fuel thing . a bit above my experience level but maybe harmonic balancer or torque converter or a very very outside chance, a broken crankshaft . hope i am wrong , even the harmonic balancer can be a pain to replace .