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  #1  
Old 12-31-2006, 09:53 AM
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More throttle means less power & speed?



I have just bought a 1982 240D with the 4 speed manual transmission. Its service is unknown & it has 290,000 miles on the clock. It seems the more throttle I give the engine the slower it goes & the less power it has. Back off the throttle a bit and it gains a bit but not very much. Trying to pull a long hill will almost stall the engine completely. The guy I bought it from says it actually did stop on him a few times. It idles fine and a compression check shows good across the board. I’ve changed the fuel filters & carefully adjusted the valves & neither helped a bit. I replaced the fuel injectors & this didn’t help. I suspected an obstruction from the fuel tank to the engine & put a small one gallon tank under the hood & still had no improvement. It is a U.S. model with the EGR valve but the tube between the exhaust manifold has been plugged and most of the EGR vacuum lines are loose. Any ideas? Thanks for any/all replies in advance.


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  #2  
Old 12-31-2006, 11:32 AM
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Quote:
Originally Posted by us441south View Post


I have just bought a 1982 240D with the 4 speed manual transmission. Its service is unknown & it has 290,000 miles on the clock. It seems the more throttle I give the engine the slower it goes & the less power it has. Back off the throttle a bit and it gains a bit but not very much. Trying to pull a long hill will almost stall the engine completely. The guy I bought it from says it actually did stop on him a few times. It idles fine and a compression check shows good across the board. I’ve changed the fuel filters & carefully adjusted the valves & neither helped a bit. I replaced the fuel injectors & this didn’t help. I suspected an obstruction from the fuel tank to the engine & put a small one gallon tank under the hood & still had no improvement. It is a U.S. model with the EGR valve but the tube between the exhaust manifold has been plugged and most of the EGR vacuum lines are loose. Any ideas? Thanks for any/all replies in advance.
You might check and make sure your throttle linkage is opening the rack all the way, which you proly already did. The other thing that comes to mind is timing, oh and did you check the chain stretch when you adjusted the valves?
What were the compression numbers, above 300?
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  #3  
Old 12-31-2006, 09:21 PM
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Make sure you are using a low enough gear. Use the dots on the speedo and don't be afraid to go a few MPH *past* the dots without shifting.
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  #4  
Old 12-31-2006, 09:29 PM
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Can you say.." Fuel starvation"?

Run engine with a 5 gallon can, of diesel obviously, with pick up hose AND return hose in the can.




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Last edited by dkveuro; 12-31-2006 at 09:37 PM.
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  #5  
Old 01-01-2007, 08:48 AM
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Quote:
Originally Posted by dkveuro View Post
Can you say.." Fuel starvation"?

Run engine with a 5 gallon can, of diesel obviously, with pick up hose AND return hose in the can.




.
I believe he mentioned already doing that with no improvement...
The only other thing I can think of is an air leak in the fuel system somewhere. This is definitely a fixable problem..
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  #6  
Old 01-01-2007, 09:11 AM
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Is the primer pump leaking? See if it leaks, it may be causing your fuel starvation. Aside from that, the other thing I could think of is the fuel pump itself.
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  #7  
Old 01-01-2007, 10:08 AM
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Post a picture of your engine. A couple of months ago someone had a similar problem and it turned out there was a vac line running to the altitude compensator on the injector pump. Never know what we will spot.
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  #8  
Old 01-01-2007, 11:13 AM
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Originally Posted by OMEGAMAN View Post
Post a picture of your engine. A couple of months ago someone had a similar problem and it turned out there was a vac line running to the altitude compensator on the injector pump. Never know what we will spot.
LOL..Well if theres a vacuum nipple there plug a vacuum line onto it ..right
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1964 Allice Chalmers D15 tractor
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  #9  
Old 01-01-2007, 11:31 AM
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Quote:
Originally Posted by ForcedInduction View Post
Make sure you are using a low enough gear. Use the dots on the speedo and don't be afraid to go a few MPH *past* the dots without shifting.
Yep, deffinitely sounds like you're lugging the engine. Peak power band is at/above 3,300 rpm. The engine should sound like its winding out and makin a helluva racket, never just piddling along. Search *italian tune-up* to this forum.
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  #10  
Old 01-01-2007, 01:15 PM
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Originally Posted by Astroman View Post
I believe he mentioned already doing that with no improvement...
The only other thing I can think of is an air leak in the fuel system somewhere. This is definitely a fixable problem..
Ops ! Oh yes, so he did...sorry

Air getting in supply maybe, but after that 'tank' test it would exclude the tank outlet and lines up to where he married in the hoses for the tank.
I would now try another lift pump..easy to do.

...or did he try that too!


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  #11  
Old 01-01-2007, 02:14 PM
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Quote:
Originally Posted by ForcedInduction View Post
Make sure you are using a low enough gear. Use the dots on the speedo and don't be afraid to go a few MPH *past* the dots without shifting.

My engine would wimp out and sound like it was being tortured before I reached the dots.
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  #12  
Old 01-02-2007, 11:57 AM
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Thanks for the fast replies & all the help. You guys really know how to make a first time poster feel welcome. To address your comments I’ll start at the top.
To Steveo: The Linkage is lined up for full throttle capability, the timing chain is in good shape & compression tops 300 across the board.

To Forcedinduction: Lugging the engine just isn’t the case here. I’m doing my best to wind it tight something is standing in my way.

To DKVeuro: “Fuel starvation“?…my thoughts exactly, or possibly an air leak.

To Astroman: “This is definitely a fixable problem“….Thanks for the encouragement. I’m pretty enthused about this car!

To Mbeige: “Is the primer pump leaking“?….Yes it is. I’ve just ordered one & this is where I’ll start first.

To Omegaman: “A couple of months ago someone had a similar problem and it turned out there was a vac line running to the altitude compensator on the injector pump.” The vacuum pump is out on this car & it’ll be the 2nd thing repaired, just after the primer pump.

To 240dog: The “Italian Tune-up” is a certainty after I get it running right.

Guys thanks for your help. I’ll keep you posted on my progress. I’m at a stalemate at this point as I’ve had to order my primer pump on the internet as no local supplier could be found. Again, a great big thanks to all!
us441south
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  #13  
Old 01-02-2007, 12:15 PM
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Quote:
Originally Posted by us441south View Post
The vacuum pump is out on this car & it’ll be the 2nd thing repaired, just after the primer pump.
?? Maybe the 240D is different the 617 and 603, but I thought that baby was critical to the engine. Maybe not as much on a manual, but still...
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  #14  
Old 01-02-2007, 12:18 PM
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My 79 300SD would do this to some extent. It was over fueling. I found backing off the pedal a bit generated more power, at least until the turbo spooled
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  #15  
Old 01-02-2007, 01:40 PM
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Quote:
Originally Posted by ConnClark View Post
My 79 300SD would do this to some extent. It was over fueling. I found backing off the pedal a bit generated more power, at least until the turbo spooled
I experience this once in a while too. Just let of a little and it will go faster. I just chalk it up to the character of the car and move on.
Though I believe what us441south is experiencing is a little more extreme.

Danny

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