Question about Cars & Trucks
Have a 1999 ford f350 powerstroke. When accelerating under with 3/4 a tank or less without a load or a trailer it makes this surging noise like Wan Wan Wan. But when pulling it runs with surging noise at 70mph on cruise at any amount of fuel. Also when pulling i can put my foot to the floor and it won't go over 55mph but when it is unloaded and not pulling a trailer it will run top speed. The first time it did the surging when pulling a 14,000 pound backhoe up a hill that was about a 20 degree slope and nearly didn't make it up the hill......had to put flashers on, and crawl up the hill in Low gear. I think it has some something to do with fuel but im not for sure. Can any one help or give suggestions on what it could be causing it?
Pretty complex problem there man! sounds like it could possibly be something with the transmission. at the part when you say if youre pulling at 55 and it wont speed up, does the engine rev up but it doesnt do anything or no change in engine speed? if the engine sped up, it sounds like a transmission problem, if it didnt make a change in the engine, then it could be as you said a fuel problem. also as a last thought, it could also be a sensor malfunctioning. you might want to take it to a ford dealer and get it diagnosed
Posted on Dec 01, 2012
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Posted on Jan 02, 2017
I HAD A SIMILIAR SOUND ON MY 2000 GRAND PRIX, WHEN IT WAS NEW. THEY REPLACED THE EXHAUST SYSTEM, & SAID IT HAD BROKEN BAFFLES IN THE CATALYTIC CONVERTER. FIND OUT WHERE YOUR CONVERTER IS LOCATED. MINE WAS UNDER THE PASSENGER SEAT.
Posted on Aug 11, 2010
check the wiring harness and connectors to the boost sensor, if sensor is not reading the truck drops into safe mode, and drastically decreases engine power. the sensor is located on the intake manifold.
Posted on Mar 28, 2011
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