460 Engine F-250
#1
460 Engine F-250
I recently purchased a used 1989 Ford F-250 (4x4) with the huge big block 460 engine which is a 7.5 liter V-8 engine to help accomplish a full renovation of my elderly mother's house. This particular year of F250s was in the early years of fuel injection for that engine which Ford began installing there in St. Paul, Minnesota. The truck had received a mild-restoration and checked out with a reputable mechanic shop. While driving it the 700 miles home, I started to encounter engine problems. At highway speed of 65 mph, the truck appears to lose power. Specifically, while driving on Interstate 75, in middle Georgia (somewhat hilly) the truck would start to slow and lose power. An additional increase to the throttle, (additional fuel to speed-up) would cause engine knocking. When I reached the top of the incline (again, nothing severe), the truck would regain power and pick right up until I hit another hill or need any significant increase to the throttle. When the engine knocked, if I backed off the gas, the knocking would immediately stop.
I found myself in this predicament at 1:00 am so I continued to drive approx 150 miles in this reduced status. None of the dash engine gauges indicated any problems but I did notice the fuel consumption doubled. At the beginning of the trip, I was getting 11 mpg; during the last 150 miles with the power loss and knocking, the mileage dropped to 5 miles per gallon. It appears the 460 engine only consumed one quart of oil for the 700 mile trip, (although very dirty oil considering the oil change two days prior). I am assuming I likely have a ignition/spark plug problem and likely inaccuarte timing.
I would appreciate any advice anyone can offer.
I found myself in this predicament at 1:00 am so I continued to drive approx 150 miles in this reduced status. None of the dash engine gauges indicated any problems but I did notice the fuel consumption doubled. At the beginning of the trip, I was getting 11 mpg; during the last 150 miles with the power loss and knocking, the mileage dropped to 5 miles per gallon. It appears the 460 engine only consumed one quart of oil for the 700 mile trip, (although very dirty oil considering the oil change two days prior). I am assuming I likely have a ignition/spark plug problem and likely inaccuarte timing.
I would appreciate any advice anyone can offer.
Last edited by 89-F250-460; 04-29-2024 at 05:12 PM. Reason: spelling errors
#3
#4
I recently purchased a used 1989 Ford F-250 (4x4) with the huge big block 460 engine which is a 7.5 liter V-8 engine to help accomplish a full renovation of my elderly mother's house. This particular year of F250s was in the early years of fuel injection for that engine which Ford began installing there in St. Paul, Minnesota.
….An additional increase to the throttle, (additional fuel to speed-up) would cause engine knocking. When I reached the top of the incline (again, nothing severe), the truck would regain power and pick right up until I hit another hill or need any significant increase to the throttle. When the engine knocked, if I backed off the gas, the knocking would immediately stop.
At the beginning of the trip, I was getting 11 mpg; during the last 150 miles with the power loss and knocking, the mileage dropped to 5 miles per gallon. It appears the huge engine only consumed one quart of oil for the 700 mile trip…ignition/spark plug problem and likely inaccuarte timing.
….An additional increase to the throttle, (additional fuel to speed-up) would cause engine knocking. When I reached the top of the incline (again, nothing severe), the truck would regain power and pick right up until I hit another hill or need any significant increase to the throttle. When the engine knocked, if I backed off the gas, the knocking would immediately stop.
At the beginning of the trip, I was getting 11 mpg; during the last 150 miles with the power loss and knocking, the mileage dropped to 5 miles per gallon. It appears the huge engine only consumed one quart of oil for the 700 mile trip…ignition/spark plug problem and likely inaccuarte timing.
Could you have gotten bad gas at the last filling station or did that continue for several tanks? 11mpg sounds about right and would be great mileage if the truck was loaded down.
To add to this thought…..and pressure? There could be fault codes even though the check engine light did not come on.
#5
No, all of my wheeled vehicles are either inline 6s (preferred) or V-8s. The 460 engine was large then and continues to be.....but I am more well versed in turbine engines. Hoping someone else will provide a better response. Just FYI, the Twin Cities Assembly Plant was a Ford Motor Company manufacturing facility in Saint Paul, Minnesota, United States, that operated from 1925 to 2011.
Last edited by 89-F250-460; 04-29-2024 at 05:54 PM.
#6
No, all of my wheeled vehicles are either inline 6s (preferred) or V-8s. The 460 engine was large then and continues to be.....but I am more well versed in turbine engines. Hoping someone else will provide a better response. Just FYI, the Twin Cities Assembly Plant was a Ford Motor Company manufacturing facility in Saint Paul, Minnesota, United States, that operated from 1925 to 2011.
A quick search shows that Ford built the Ranger trucks there. Not F- Series trucks.
#7
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#8
I have no authority to do that. I don’t know what happened on your end of the computer.
#9
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