General Rotary Tech Support Use this forum for tech questions not specific to a certain model year

what could it be?

Thread Tools
 
Search this Thread
 
Old 03-03-05, 03:37 PM
  #1  
Full Member

Thread Starter
 
hotimport18's Avatar
 
Join Date: Apr 2004
Location: southbridge massachusettes
Posts: 178
Likes: 0
Received 0 Likes on 0 Posts
what could it be?

my 86 fc runs great intill it hits 4,000rpms when driving... then it will choke for about 2 seconds an continue to climb the rpms?....ive already changed plugs,airfilter an fuel filter but its still doing it ........help any one??????
Old 03-03-05, 04:38 PM
  #2  
Senior Member

 
nevarmore's Avatar
 
Join Date: Feb 2004
Location: NE Ohio
Posts: 739
Likes: 0
Received 0 Likes on 0 Posts
I'm not up to speed on the 13B yet, but I believe the secondary throttle plates open around then. If something isnt quite right (TPS maybe??) then you'll be drawing more air with not enough fuel until the ECU catches up.
Old 03-03-05, 05:00 PM
  #3  
Full Member

Thread Starter
 
hotimport18's Avatar
 
Join Date: Apr 2004
Location: southbridge massachusettes
Posts: 178
Likes: 0
Received 0 Likes on 0 Posts
thats a good brobability never thought of that ....thanks!!!!!!
Old 03-03-05, 06:38 PM
  #4  
Senior Member

 
nevarmore's Avatar
 
Join Date: Feb 2004
Location: NE Ohio
Posts: 739
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by hotimport18
thats a good brobability never thought of that ....thanks!!!!!!
Yea hopefully someone who knows better than I will come along to confirm and give a specific fix.
Old 03-04-05, 04:25 AM
  #5  
ghetto engineer

 
Zenki FC's Avatar
 
Join Date: Sep 2004
Location: Co. springs
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
ran into the same problem with my TII at 3800rpm, re grounded the engine, battery, and ecu. After that the problem never came back... ever. Its worth a shot, good luck!
Old 03-04-05, 08:21 PM
  #6  
Newbie
 
rudedog6999's Avatar
 
Join Date: Mar 2005
Location: Iowa U.S.A.
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Zenki FC
ran into the same problem with my TII at 3800rpm, re grounded the engine, battery, and ecu. After that the problem never came back... ever. Its worth a shot, good luck!
Excellent point, and a commonly overlooked problem area. You may have just found the cure for the notorious dead spot in many F.I. Rx7's. I'm a first gen owner,and they have a problem with wiring oxidation in wetter climates. There may be other causes for that flat spot, but this is a free fix, and well worth trying. Heavier gauge , and additional ground straps, are a lesson I learned in my audiophile days. Good luck, and happy rotoring.




All times are GMT -5. The time now is 12:57 AM.