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300sd engine misfire

300sd engine misfire

 
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kunasw
Naturally-aspirated

9
04-13-2011, 05:48 PM #1
    Hi everyone I am new.

I have a 1980 300sd turbo diesel with almost 200k miles with misfiring engine.

all five cylinders do not fire all the time, it feels like. normally it will be running on 4.5 and sometimes it will loose power drastically and it really feels like running on 1 or 2 cylinders. sometimes it stops on the road but usually i just keep on pressing the accel then others gradually start to fire again.

I am not a mechanic but wants to learn and work on my own car.
I had started with this one. i changed the oil, oil filter, both fuel filters, air filters, battery, glow plugs, and did valve adjustments.

I very much like this car and hope i can do some mods on it too like other members in this forum but still cannot turn it into a daily driver.
I got this one for like 2k if this problem is related with serious engine damage then maybe i need to get rid of it but i wish i don't have to.

Please help THANK YOU
kunasw
04-13-2011, 05:48 PM #1

    Hi everyone I am new.

I have a 1980 300sd turbo diesel with almost 200k miles with misfiring engine.

all five cylinders do not fire all the time, it feels like. normally it will be running on 4.5 and sometimes it will loose power drastically and it really feels like running on 1 or 2 cylinders. sometimes it stops on the road but usually i just keep on pressing the accel then others gradually start to fire again.

I am not a mechanic but wants to learn and work on my own car.
I had started with this one. i changed the oil, oil filter, both fuel filters, air filters, battery, glow plugs, and did valve adjustments.

I very much like this car and hope i can do some mods on it too like other members in this forum but still cannot turn it into a daily driver.
I got this one for like 2k if this problem is related with serious engine damage then maybe i need to get rid of it but i wish i don't have to.

Please help THANK YOU

aaa
GT2256V

913
04-13-2011, 06:14 PM #2
I'm starting to hate the word misfire, it seems to be a really bad way to describe these problems.

The "sometimes" part makes me think it's still fuel related. There is a filter screen in the tank itself as well. Any signs of black stuff on your old filters?
aaa
04-13-2011, 06:14 PM #2

I'm starting to hate the word misfire, it seems to be a really bad way to describe these problems.

The "sometimes" part makes me think it's still fuel related. There is a filter screen in the tank itself as well. Any signs of black stuff on your old filters?

kunasw
Naturally-aspirated

9
04-14-2011, 05:02 PM #3
YES I had a problem with clogged up fuel filter. my mechanic told me i may need to clean the tank
This post was last modified: 04-14-2011, 09:47 PM by kunasw.
kunasw
04-14-2011, 05:02 PM #3

YES I had a problem with clogged up fuel filter. my mechanic told me i may need to clean the tank

kunasw
Naturally-aspirated

9
04-14-2011, 05:02 PM #4
YES I had a problem with clogged up fuel filter. my mechanic told me i may need to clean the tank
This post was last modified: 04-14-2011, 05:03 PM by kunasw.
kunasw
04-14-2011, 05:02 PM #4

YES I had a problem with clogged up fuel filter. my mechanic told me i may need to clean the tank

larsalan
Superturbo

1,272
04-14-2011, 06:44 PM #5
Which filter? What was the clog?

Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
larsalan
04-14-2011, 06:44 PM #5

Which filter? What was the clog?


Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'

kunasw
Naturally-aspirated

9
04-14-2011, 09:45 PM #6
replaced both prefilter and the spin on.
it used to hesitate when accelerating. i changed the fuel filters. no problem ever since. didn't really examined what the clog was..
since then i started filling up when i'm half way through the tank. recently i had noticed a significant fuel loss until 2/3 of the tank which is another problem.. maybe i need a new tank also..
replaced both prefilter and the spin on.
it used to hesitate when accelerating. i changed the fuel filters. no problem ever since. didn't really examined what the clog was..
since then i started filling up when i'm half way through the tank. recently i had noticed a significant fuel loss until 2/3 of the tank which is another problem.. maybe i need a new tank also..
This post was last modified: 04-14-2011, 09:46 PM by kunasw.
kunasw
04-14-2011, 09:45 PM #6

replaced both prefilter and the spin on.
it used to hesitate when accelerating. i changed the fuel filters. no problem ever since. didn't really examined what the clog was..
since then i started filling up when i'm half way through the tank. recently i had noticed a significant fuel loss until 2/3 of the tank which is another problem.. maybe i need a new tank also..


replaced both prefilter and the spin on.
it used to hesitate when accelerating. i changed the fuel filters. no problem ever since. didn't really examined what the clog was..
since then i started filling up when i'm half way through the tank. recently i had noticed a significant fuel loss until 2/3 of the tank which is another problem.. maybe i need a new tank also..

larsalan
Superturbo

1,272
04-15-2011, 12:05 AM #7
A new tank full of fuel you mean? Maybe you can get a bit more stuff out of the tank it you swap the supply and return lines for a while.
I only mention it because I recently had some frustrating issues with this stuff myself.

Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
larsalan
04-15-2011, 12:05 AM #7

A new tank full of fuel you mean? Maybe you can get a bit more stuff out of the tank it you swap the supply and return lines for a while.
I only mention it because I recently had some frustrating issues with this stuff myself.


Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'

aaa
GT2256V

913
04-15-2011, 02:24 AM #8
Again, there's a filter inside the tank itself, that can cleaned or bought new after the tank is drained.

Fuel loss? Notice any puddles of leaked diesel on the ground?
aaa
04-15-2011, 02:24 AM #8

Again, there's a filter inside the tank itself, that can cleaned or bought new after the tank is drained.

Fuel loss? Notice any puddles of leaked diesel on the ground?

kunasw
Naturally-aspirated

9
04-15-2011, 02:20 PM #9
http://www.dieselgiant.com/Mercedesfueltankremoval.htm
maybe this is what i need to do! yes?
kunasw
04-15-2011, 02:20 PM #9

http://www.dieselgiant.com/Mercedesfueltankremoval.htm
maybe this is what i need to do! yes?

kunasw
Naturally-aspirated

9
04-15-2011, 02:20 PM #10
http://www.dieselgiant.com/Mercedesfueltankremoval.htm
maybe this is what i need to do! yes?
kunasw
04-15-2011, 02:20 PM #10

http://www.dieselgiant.com/Mercedesfueltankremoval.htm
maybe this is what i need to do! yes?

aaa
GT2256V

913
04-15-2011, 02:35 PM #11
I suppose... feels like overkill though. Drain the tank and remove the filter, not hard to do with the tank in place, as long as you don't mind diesel splashing all over you. I suppose if you removed the whole tank it'll only splash on your hand instead.
aaa
04-15-2011, 02:35 PM #11

I suppose... feels like overkill though. Drain the tank and remove the filter, not hard to do with the tank in place, as long as you don't mind diesel splashing all over you. I suppose if you removed the whole tank it'll only splash on your hand instead.

kunasw
Naturally-aspirated

9
04-16-2011, 03:58 PM #12
Thank you i definately should examine and really find out where the gas leak is first. hope its not the gas tank
or i can swap supply and return lines for a while before i start taking things apart..
or i can swap supply and return lines for a while before i start taking things apart..
This post was last modified: 04-16-2011, 04:04 PM by kunasw.
kunasw
04-16-2011, 03:58 PM #12

Thank you i definately should examine and really find out where the gas leak is first. hope its not the gas tank


or i can swap supply and return lines for a while before i start taking things apart..
or i can swap supply and return lines for a while before i start taking things apart..

larsalan
Superturbo

1,272
04-16-2011, 04:55 PM #13
Yeah, if you swap the lines you might just catch some gunk in your clear primary filter. I ended up going to the trouble of pulling out the in tank screen just to find that it was perfectly fine. Piece of mind I guess but, I spilled some fuel and wasted like 2 hrs of my life. And had to buy a $7 socket.

Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
larsalan
04-16-2011, 04:55 PM #13

Yeah, if you swap the lines you might just catch some gunk in your clear primary filter. I ended up going to the trouble of pulling out the in tank screen just to find that it was perfectly fine. Piece of mind I guess but, I spilled some fuel and wasted like 2 hrs of my life. And had to buy a $7 socket.


Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'

kunasw
Naturally-aspirated

9
04-22-2011, 01:19 PM #14
I swaped the lines and didn't solve the problem... hmmmm
This time when the engine was loosing power with a shake (it felt like it was firing only 3 cylinders) I opened up the hood then used the hand pump to feed more diesel into the engine which quickly let other cylinders to fire.
Is it safe to conclude that there is a problem with a diesel delivery than engine malfunction?
Do I have cloggled up injectors..?
kunasw
04-22-2011, 01:19 PM #14

I swaped the lines and didn't solve the problem... hmmmm
This time when the engine was loosing power with a shake (it felt like it was firing only 3 cylinders) I opened up the hood then used the hand pump to feed more diesel into the engine which quickly let other cylinders to fire.
Is it safe to conclude that there is a problem with a diesel delivery than engine malfunction?
Do I have cloggled up injectors..?

300D50
Graphite Moderator, ala RBMK

775
04-22-2011, 02:35 PM #15
Seems like it's getting air into the lines, or the lift pump isn't keeping up with the fuel demand.

Have you noticed a "whoosh" when you unscrew the fuel cap on the tank right after shutdown? if so, it could be a clogged tank vent.

1990 Power Ram 50 V6 SOHC 24V 6g72

I can be wrong, don't take everything I say as verbatim, please fact-check first.
My posts are my personal opinions and thoughts, unless otherwise noted.
300D50
04-22-2011, 02:35 PM #15

Seems like it's getting air into the lines, or the lift pump isn't keeping up with the fuel demand.

Have you noticed a "whoosh" when you unscrew the fuel cap on the tank right after shutdown? if so, it could be a clogged tank vent.


1990 Power Ram 50 V6 SOHC 24V 6g72

I can be wrong, don't take everything I say as verbatim, please fact-check first.
My posts are my personal opinions and thoughts, unless otherwise noted.

kunasw
Naturally-aspirated

9
04-23-2011, 02:38 PM #16
If I pump hard, it makes a tiny whisling sound around the injectors or injection pump. would this be the sound of air getting into the fuel line? How do I diagnose and fix? If its the lift pump, is there a way to test? and where can I find the tank vent?

Thank you for your help
kunasw
04-23-2011, 02:38 PM #16

If I pump hard, it makes a tiny whisling sound around the injectors or injection pump. would this be the sound of air getting into the fuel line? How do I diagnose and fix? If its the lift pump, is there a way to test? and where can I find the tank vent?

Thank you for your help

larsalan
Superturbo

1,272
04-23-2011, 02:53 PM #17
there are 3 lines coming off the tank supply, return and vent. The vent looks like a bell.
[Image: snap_10.jpg]
It will open with minimal pressure going in either direction.
My pump would always make a 'wooshing' sound to so I can't say much about that.

Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'
larsalan
04-23-2011, 02:53 PM #17

there are 3 lines coming off the tank supply, return and vent. The vent looks like a bell.
[Image: snap_10.jpg]
It will open with minimal pressure going in either direction.
My pump would always make a 'wooshing' sound to so I can't say much about that.


Rusted out beat down 300d turbo 82' -- RIP
Nice body, tons of ridiculous mechanical issues - 300d turbo 82' /motor 85'

300D50
Graphite Moderator, ala RBMK

775
04-23-2011, 09:07 PM #18
The "whoosh" is the fuel going past the relief valve in the IP, that's normal.

I'd check for a clogged tank vent first, if there's a "whoosh" from the filler neck, it's likely the vent is clogged.

1990 Power Ram 50 V6 SOHC 24V 6g72

I can be wrong, don't take everything I say as verbatim, please fact-check first.
My posts are my personal opinions and thoughts, unless otherwise noted.
300D50
04-23-2011, 09:07 PM #18

The "whoosh" is the fuel going past the relief valve in the IP, that's normal.

I'd check for a clogged tank vent first, if there's a "whoosh" from the filler neck, it's likely the vent is clogged.


1990 Power Ram 50 V6 SOHC 24V 6g72

I can be wrong, don't take everything I say as verbatim, please fact-check first.
My posts are my personal opinions and thoughts, unless otherwise noted.

Captain America
Boostin' & Roostin'

2,221
04-24-2011, 04:23 PM #19
My tank vent is clogged. But the vent line doesn't have the valve before the bell like in the picture...


1982 300D Turbo ... 3,6xxlbs, No fan, No AC, Hood Stack, No ALDA, No rear bumper and stuffed front, A/W Intercooled, Injectors by Greezer and HUGE Pre-Chambers with help from OM616 & Simpler=Better, Fuel Cranked up, 60 Trim Compressor wheel, EGT, EMP, Boost 50" Rigid Radius bar on roof Aux tank for a total of 48 Gal Of Diesel! Odyssey PC-1750 Battery in trunk, 27"x8.5"/R14 Maxxis BigHorn Mud Terrains, In June '14 issue of Off Road Mag

AX15 Jeep Trans swap in progress....

Captain America
04-24-2011, 04:23 PM #19

My tank vent is clogged. But the vent line doesn't have the valve before the bell like in the picture...



1982 300D Turbo ... 3,6xxlbs, No fan, No AC, Hood Stack, No ALDA, No rear bumper and stuffed front, A/W Intercooled, Injectors by Greezer and HUGE Pre-Chambers with help from OM616 & Simpler=Better, Fuel Cranked up, 60 Trim Compressor wheel, EGT, EMP, Boost 50" Rigid Radius bar on roof Aux tank for a total of 48 Gal Of Diesel! Odyssey PC-1750 Battery in trunk, 27"x8.5"/R14 Maxxis BigHorn Mud Terrains, In June '14 issue of Off Road Mag

AX15 Jeep Trans swap in progress....

 
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