Performance
03-11-2013, 12:17 PM
#1
Thread Starter
Join Date: Mar 2013
Location: Indiana
Posts: 4
Performance
Hey guys -
New member here........i have a 1998 Mustang 4.6L converitable. I love it and have owned it for 8 years. I only drive it in the spring and summer. It has 220,000 miles on it. I am having trouble with power. I put some new plugs in it last year and it ran ok for a few months then went back to bogging down again as high speeds, and I would get like a spark knock sound as I was accelerating. The plugs I use are the Split Fire ones. I have read on some forums that its best to put the original Ford spark plugs in it. I don't know if this will work or if you all have tried this and found another spark plug that seems to work best..... let me know.
New member here........i have a 1998 Mustang 4.6L converitable. I love it and have owned it for 8 years. I only drive it in the spring and summer. It has 220,000 miles on it. I am having trouble with power. I put some new plugs in it last year and it ran ok for a few months then went back to bogging down again as high speeds, and I would get like a spark knock sound as I was accelerating. The plugs I use are the Split Fire ones. I have read on some forums that its best to put the original Ford spark plugs in it. I don't know if this will work or if you all have tried this and found another spark plug that seems to work best..... let me know.
03-11-2013, 07:48 PM
#4
3rd Gear Member
Join Date: Nov 2012
Location: North Carolina
Posts: 574
As they said split fire are garbage, however it is very possible your engine is detonating. With that kind of mileage it is likely you have a lot of carbon on your pistons which is causing hot spots and premature detonation.
03-12-2013, 09:15 AM
#5
Thread Starter
Join Date: Mar 2013
Location: Indiana
Posts: 4
. Thanks for the info. The wires were also replaced last yr. Yes I still have the same fuel pump, but I did get some codes and my mechanic said it came up on his computer as a bad purge valve in the gas tank...could that be the cause of the power loss??
03-12-2013, 09:26 AM
#6
Thread Starter
Join Date: Mar 2013
Location: Indiana
Posts: 4
. Thanks for the reply. Is there anything I can do to clean the pistons???
03-12-2013, 02:37 PM
#9
Try a different set of plugs, maybe new wires and coils, a fuel filter, test your fuel pressure, and do a leak down test on the cylinders, thats a good place to start with something with mileage that high.
03-12-2013, 07:08 PM
#10
3rd Gear Member
Join Date: Sep 2006
Location: El Paso, TX
Posts: 700
Bogging down at high speeds sound like an intermitent problem. besides, you said it ran fine for a while so i wouldnt blame the motor just yet. A loss of power like that can be caused by loss of fuel, spark or a bad maf. Auto or 5 speed? Some autos will cause bogging problems on their way out the door.