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sands 07-26-2009 07:19 PM
Need help, loss of rpms
 
I own a 1999 pantera with twin 502 efi's. Late start to season and had the water pumps, distributor, cap, and plugs changed. Ran right around 5000 rpm's last three years with gps reading between 76-79 mph. This year, port motor max rpm's right around 4200, starboard max around 4400 and I can only reach 64 mph. Engines don't seem to be running rough. Any ideas.

Thanks, Joe

DareDevil 07-26-2009 07:25 PM
Originally Posted by sands (Post 2918476)
I own a 1999 pantera with twin 502 efi's. Late start to season and had the water pumps, distributor, cap, and plugs changed. Ran right around 5000 rpm's last three years with gps reading between 76-79 mph. This year, port motor max rpm's right around 4200, starboard max around 4400 and I can only reach 64 mph. Engines don't seem to be running rough. Any ideas.

Thanks, Joe
Check your timing and the fuel filter.
pull the sparkplugs and look at them , u want a nice light brown color on the tip.
Also check the plugwires,,if 1 cyl,fails u really cant tell.

Vinny P 07-26-2009 07:26 PM
You didnt mention having the fuel filters and water seperators replaced. If they were not, I would start there.


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