Problems with 95 International DT 408

This topic contains 5 replies and was last updated by vince-rodia 10 years 11 months ago
October 27th, 2010 10:40pm
Hello I have a 95 International 4700 With auto trans and DT 408 with Bosch Mechanical injection NOT ELECTRONIC just rolled 358000 miles I have had this truck over 2 years and put almost 90000 miles on it Now the problem It runs great and when you are crusing on the highway for about ten miles or so the throttle will sort of flatten out like its running out of fuel but the throttle will be delayed if you step on it it will take a second to respond but then it will pull away and throttle up for a few seconds as if you are setting a cruise control and if you let the throttle drop back completely it will slow down so much the engine stalls it will start right back up and idle fine until you get right back up to thet cruising speed again it doesn,t do this first thing in the morning it seems to only start this about an hour after it's been run and if it starts doing this if i shut it down go get a cup of coffee or lunch it will seem to run fine for an hour or so or it won't do it if I'm running in town for short bursts,,,

Now let me tell you what I've changed Fuel Filter,, cleaned replaced small filter removed and cleaned fuel tanks changed fuel pickup tube traced checked fuel lines changed air filter and replaced fuel transfer pump ,,

this has been acting up for the last 4000 MILES..

Any input would be gladly accepted THANKS
October 28th, 2010 9:41pm
Is this the Bosch in-line injection pump? If it is, I suspect what is happening is the governor flyweights are hanging up, or there is interference between the rack control rod and the plungers.

But before you tear into the injection pump, prove that the other things are working as they are supposed to. Do pressure, flow and volume tests on the supply pump. Check injector return line flows.

You say you cleaned the tank, so there should not be anything floating around to plug the pickup line. I did have a incident where some cellophane from a cigarette package would intermittantly block the pick up tube.

Eliminate all the other things before you commit to having the fuel pump rebuilt. ($2,000 - $3,000)
October 29th, 2010 4:06am
I agree with jimo,it appears to be an injection problem,but you better make an educated decision before a pump rebuild.I have that exact same truck for a service truck but mine is a 1994 model.This year it seems to be running hotter than before but I haven't had a chance to look at it yet.What are your shift points for third gear,the mph that it shifts,mine dosen't seem like it is in third for very long before it shifts down or up.Just popped into my mind that maybe your having trouble with your shut down solonoid-tie it back and try it.good luck.
October 29th, 2010 4:37am
Hello All ,, Yes it does have the Bosch injection pump and I did remove the fuel tanks and drained them and even put a light down inside they were actually shiney clean inside,, Mine always has run as what seemed hot around 200 to 210 i even Flushed the system and it always runs warm but doesn't seem to be a problem as to the shifting the tranny has always lagged at third but I have 3 of theses trucks with the allison 545 and they all act the same sometimes it seems they shift late or will shift up down up down but have Never left me stuck

And I did check the fuel selonoid held it back and it just wouldn't shut off when i tried to shut it down I've been leaning towards the injection pump but want to try eliminating all the easier tests before I spend the big money,, Thanks for the advice so far and will be checking incase someone thinks of something else
January 30th, 2011 2:22am
Another thing you can look at is the fuel lines make sure you are not sucking air from the lines a cracked filter base colapsted fuel line ect. If it turns out to be the injection pump go to a case internatonal farm equipment dealer to get a new one way cheaper. Same pump as on a 1066 ih tractor
January 30th, 2011 6:59am
Sure sounds like a governor problem. Jim I think is on the right track. I'm not really famillier with the engine in question and this might be plain speculation, but because this happens after a time at highway speed. Could the return flow back to tank be warming the fuel in the tank and it is the hot fuel causing the problem?

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