Misfire below 2.5k

andymac1970 · September 18, 2011, 04:22:00 PM

Hi All,

I\'ve just bought my first RX7 after YEARS if wanting one.

It\'s a 1989 FC N/A which I intend to hillclimb next year in and around Yorkshire - Harewood, Prescott and Curborough are all part of the "tour" planned as well as at least 1 track day at Croft.
My car has a misfire below 2.5k and I\'m struggling to diagnose it very well.
Can anyone help with potential culrpits, maybe there are a few "favourite" possibility\'s out there ?
Thanks a lot and hello to everyone:wave
Andy

m1tch · September 18, 2011, 04:38:42 PM

Firstly welcome to the forum! Get some photos up

Are there any mods on the car or is it 100% OEM? It might be something simple like the HT leads failing, an air leak or a leaking injector. The FCs are now getting on a bit, so some vac lines or rubber tubes can start to perish, causing issues.

B.Martin · September 18, 2011, 05:03:46 PM

Welcome to the club, pics please

Regarding problem Mitch\'s thoughts are a good place to start!

micha^fc3s · September 19, 2011, 07:32:43 PM

My Turbo has some Problems with air leaks at the moment where i bought it . The Effect was missfire but i am with martin . Air leaks or Injector Leak .

B.Martin · September 19, 2011, 08:22:28 PM

It\'s Mr.Martin :Giggle

Any luck Andy?

andymac1970 · September 20, 2011, 06:47:00 PM

Thanks guys

Will add some pics and start tinkering to see what I come across based on your suggestions

Will keep you up to date with how I get on

Thanks again

Andy

m1tch · September 20, 2011, 06:56:44 PM

Awesome

might be an idea to take the plugs out and see how they look, sometimes a fresh set of plugs makes a massive difference

micha^fc3s · September 20, 2011, 07:05:16 PM

Yes , with my old Plugs i had some Problems to Start the Engine . A set of new one and the engine runs without a problem .

m1tch · September 20, 2011, 07:06:25 PM

Just make sure you don\'t try and fit piston style spark plugs!

XRMike · September 20, 2011, 09:29:18 PM

My car has similar issues. I will let you know when mine gets fixed.

Kamatari · September 20, 2011, 09:56:43 PM

Is there any recommended plugs to get?

m1tch · September 20, 2011, 10:15:14 PM

MRP is suggesting these:

http://www.mazdarotaryparts.com/bset-of-4--ngk-br10et-spark-plugs-for-rx-7-egib-1182-p.asp

Lacey · September 20, 2011, 10:16:56 PM

I use NGK9\'s in mine, and have 10\'s as a spare set for emergencies

Skifledanabit · September 21, 2011, 01:12:31 AM

Quote from: Lacey;789581I use NGK9\'s in mine, and have 10\'s as a spare set for emergencies

what NGK\'s are they? where did you get them from?

Lacey · September 21, 2011, 07:07:03 AM

Quote from: Skifledanabit;789602what NGK\'s are they? where did you get them from?

Which ones are what?

The NGK10\'s that were in the car when I bought it were used, SOAKED in petrol, and it was having massive issues starting. They\'ve dried out fine now though and with some carb cleaner will come up in reasonably almost-new state, havn\'t tested the spark on them though. Swapped to NGK9\'s (from Prof to go in his T2) and it started pretty much straight up.

I suspect the 10\'s are perfectly fine and it was just majorly flooded by the previous owner, I just wanted to swap them at the time when it was having starting issues to eliminate one more possibility. Probably changed nothing apart from the spark temp though.

No idea what the 9\'s are, they\'re just \'NGK9\'s\' to me, but I have the 10\'s in the garage, why? You want a picture? You need plugs or something? :p

Misfire below 2.5k

andymac1970

andymac1970