momonusa
11-15-2006, 08:14
Hi Folks,
Here's the deal, If I'm driving at 3/4 throttle...say passing a row of traffic for a mile uphill...halfway up the hill, it will feel as if I dropped a cylinder and lose power. The service engine light will come on and stay on until I shut off the ingnition for 3 seconds and restart the truck. Once restarted, the truck runs fine and the service engine light shuts off. I figured out how to do this while driving. Although its dangerous, the truck falls flat on its face without the restart. After the restart it may or may not repeat the same thing. Is this a computer problem? All throughout the rpm range the service engine light comes on and off depending on what throttle I'm using at that moment without the "dropping a cylinder feeling" unless I'm at 3/4 throttle for a long time. I've had this problem for a while now and I've replaced the fuel pump, replaced the cylinder heads, replaced the FSD, added the FSD cooler, replaced the water pump with a high flow upgrade kit, replaced the radiator, the list goes on and on. All this done over the last 2 1/2 years.
I think the FSD driver may still be the problem or the computer. I figured I'd get some advice before buying more parts. Thanks in advanced for your help.
PS. The truck is a 1994 GMC Suburban 4x4 with the 6.5 TD (HO-F model)
Mario
Here's the deal, If I'm driving at 3/4 throttle...say passing a row of traffic for a mile uphill...halfway up the hill, it will feel as if I dropped a cylinder and lose power. The service engine light will come on and stay on until I shut off the ingnition for 3 seconds and restart the truck. Once restarted, the truck runs fine and the service engine light shuts off. I figured out how to do this while driving. Although its dangerous, the truck falls flat on its face without the restart. After the restart it may or may not repeat the same thing. Is this a computer problem? All throughout the rpm range the service engine light comes on and off depending on what throttle I'm using at that moment without the "dropping a cylinder feeling" unless I'm at 3/4 throttle for a long time. I've had this problem for a while now and I've replaced the fuel pump, replaced the cylinder heads, replaced the FSD, added the FSD cooler, replaced the water pump with a high flow upgrade kit, replaced the radiator, the list goes on and on. All this done over the last 2 1/2 years.
I think the FSD driver may still be the problem or the computer. I figured I'd get some advice before buying more parts. Thanks in advanced for your help.
PS. The truck is a 1994 GMC Suburban 4x4 with the 6.5 TD (HO-F model)
Mario