Thread: RRC 3.5 EFI running rich

Thanks alot for all the help guys, I have a much better idea of what I'm looking for now and will get back on this today.

Ok so after alot of looking around the engine bay and checking things out I found a pipe at the back of the manifold just under the throttle that was disconnected, it was sucking in unmetered air. Reconnected it and no change.
It was starting to get dark so I was wrapping stuff up and a mate came to have a quick look, he put his hand over the hole for the air intake filter and blocked it off which stalled the engine. I turned off the ignition and left it for the night
Now this morning it will just start and will idle very very low, doesn't register on the gauge and the battery light is on. I can rev it up while it's not in gear but it's very rough and it won't drive. Not blowing smoke anymore so I'm thinking it might be running lean now? Tried disconnecting the hose I put back on last night and that didn't help and if I unplug the AFM the engine dies almost straight away.
Any ideas? I'm assuming it's running lean now but I haven't changed anything other than that hose.

The plugs are probably fouled now.

The hose should be the crankcase ventilation. Trace it back to its source and see where it goes. If to a grey thing on the RH rocker cover that is what it is. If not tell us where it ends up.


Regards Philip A

The hose ends up in the flame trap or whatever you want to call it so I guess it is venting. Got the car running back to the same rich state by replacing a hose I must of split while fiddling. Ordered a replacement CTS so hopefully that will do the trick.

Ok so now without changing anything else it won't run. Sounds like the timing is really out or it's running on 5. I'll pull the plugs tomorrow and check those.

So I had a mechanic come and look and he said new leads cap and rotor. Put all those in and now it will better but still seems to be rich and won't rev over 3000 rpm. Any ideas?

OK yours should be the flapper style AFM. Pry off the plastic cover, then manually vary the position of the wiper as the engine operates. As the air flow increases the flapper moves varying the resistor track. If you hold back the wiper and it runs better then you can see that it is indeed running rich. You can vary the position of the wiper relative to the flapper, there is a small philips screw holding it in place. Also you can vary the spring tension against the airflow. Document your changes so you can return to standard. I have succesfully tuned a RRC with this method when I did a major fix to the EFI.

Ok, thanks for that I'll give it a try tomorrow. I had read about doing this before but wasn't too sure since I don't remember when I read it and didn't want to break something. I'll report back any results or changes to help anyone else in the same situation.