Mazda Rotary Club

General => General Technical => Topic started by: Archbish on September 28, 2008, 01:26:44 PM

Title: compression + spark + fuel = NOTHING...??
Post by: Archbish on September 28, 2008, 01:26:44 PM
So I\'ve finally got round to having a look at the FD.  It stopped in dramatic style on the way home from Le Mans last year, and I\'ve sulked about it since.  At the time, I was doing a fly past a pal, the temps started to creep, I could feel it misfiring under load, and when I lifted off and dipped the clutch, it died...

Now I\'ve got round to checking it, and it seems to have compression (three loud PFFS on each rotor), and it\'s definitely god spark, but it\'s not even close to firing.  I\'m thinking therefore, that we have a fuel issue...  Any suggestions??  I\'m probably going to start at the fuel pump, and work toward teh injectors.  I am pretty sure there is fuel getting into the engine (the plugs are wet when turned over), but whether it\'s enough, or not, or what, I just don\'t know...

ANy suggestions, or people with spare time who wanna come and have a look, you\'re more than welcome!! *grin*
Title: compression + spark + fuel = NOTHING...??
Post by: exige on September 28, 2008, 06:11:53 PM
egi fuse? right hand side of the engine bay behind the battery, one of the big fuses 20a I think.
Title: compression + spark + fuel = NOTHING...??
Post by: t2rew on September 28, 2008, 06:19:18 PM
fuel pressure gauge will show how much pressure you got. only a few quid and youll see straight away.

just having puffs as not really a good enough indication on comp so do a propper test.
 new plugs are def worth putting in.

then if you have fuel spark and compression tow it.
Title: compression + spark + fuel = NOTHING...??
Post by: Prof on September 28, 2008, 07:57:10 PM
Leaking injector ?
 
I had this just recently - newish engine - went to ovetake and the car lost power - pulled over and it wouldn\'t start.
 
When I pulled the plugs, very wet.
 
I took the Upper manifold off and the fuel rail, and secured the injectors to the fuel rails so they couldn\'t pop out when I turned the pump back on - I had fuel pi$$ing out of one secondary - it was robbing pressure off the rail that the primaries didn\'t have full pressure, and the rear rotor was flooding so badly it wouldn\'t start.
 
If you have a pressure gauge in the fuel line, you can see the effects of this quite easily (fuel pressure should build and hold when power is applied to the fuel pump, if it drops straight away you\'ve got an open injector) - if not it will be a pull it out and see job :(