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· Registered
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Discussion Starter · #1 ·
Morning Everyone!
A couple of regulars on the Emergency Diesel Help Forum suggested I post this thread here because you folks are probably better suited to answer my problem! My thanks to New Omega and pop for the suggestion. HELP!!!
I drive a 2003 International 4300 dt466. Set up as a box delivery truck. I deliver and pick up heavy automotive engines, transmissions etc. The truck has close to 340,000 miles and I've driven it for 5 years now. The problem I'm about to describe has happened 5 times now - each time I've required roadside assistance to change a TPS (trottle positioning sensor)or get a tow back to New Jersey! But no one can diagnose or fix the problem. Here it is..
This problem only occurs when it's wet. Rain, snow, or ice and the conditions have had to exist for a number of hours. It doesn't start as soon as it starts raining or snowing.
When the pavement is really soaked and there's a good amount of spray and water on the road I begin feeling a hesitation while I'm driving under power. The gauges don't flutter. At first it's hardly noticeable like a hiccup, but as conditions remain wet the hesitation becomes a slight bucking I can feel in the wheel and through my seat. Finally the yellow engine light comes on and I have no acceleration pedal action at all. The accelerator just ceases to function. The engine remains running and the gauges stay where they are normally, except the truck, the speedo, and the tach just wind down as I'm forced to pull onto the shoulder or into a parking lot. (Kind of scary in the dark driving rain!)
When I turn the truck off, it will start immediately - but the yellow engine light will come on and the accelerator will immediately drop out. If I turn the truck off and wait 10-30 minutes I can start and go maybe a 1/2 mile before the engine light comes on and the accelerator drops out. Waiting longer allows for a little longer driving, but it's a hell of a way to get back to base!
We've changed the TPS twice. And each of the 5 times the truck has gone into the fleet service, they've sent it back after a week because they couldn't find anything wrong. (NOTE: they tested it AFTER the storm when the roads were dry again!)
I need the forums help! Any ideas on what to check? Logic tells me something electrical is shorting out in bad weather! DUH!!! Any one have similar issues with an International 4300?
Email me .
Thanks bigeasy51
 

· Old Fart
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890 Posts
I am not familiar with the Int 4300, but windshields do leak and can get the fuse boxes wet, during rain storms. Look under the dash for water marks along the firewall. Might be getting something wet under there.
 

· Senior Member
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2,557 Posts
does the cruise control seem effected when this happens, if so the problem may be closer to the ECM, try spraying some silicone or other moisture dispersing spray on to all of the connections and pass thru s. are there any codes when this happens?
 
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· Registered
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Discussion Starter · #4 ·
Hey 379!
Thanks for responding. Unfortunately I don't know if there are any codes because our company sends the trucks out for service. Suffice it to say - I tell the mechanics that this only happens in the wet and they should try to replicate the situation...(like spray under the engine with truck running and see what happens) we've gotten the truck back 4 times now..."Uh we can't find anything wrong!!!"
Me and my buds were going to spray the hell out of it like you suggested - but then it broke down again and they sent it back in. I may do it anyway.
Thanks again for the ideas!
 

· Junior Member
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200 Posts
sounds like a moisture problem in the ecm, disconnect battery and pull plug to ecm and look for moisture, had this same thing happen to a cat engine, ecm was full of moisture , i opened it up and dried it out and ran for 2 years before it just quit, always had cold mode problem after first failure, i am not to sure but i think the dt 466 ecm is sealed.
 
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