Idle problems

Chedder · Post by **Chedder** » Tue Sep 23, 2008 3:39 pm

Having some problems maintaining a stable idle after reving the engine,
Currently running an Eaton M90 on a TVR 3.5l, Jag injectors/AFM and adjustable 4cu ECU.
The engine starts and runs great but is prone to cutting out if you come off the throttle quickly, have tried allsorts of tweaking but cant get rid of this issue......any ideas?

ChrisJC · Post by **ChrisJC** » Tue Sep 23, 2008 4:27 pm

Does it have the 'overrun cutoff valve', which is mounted next to the plenum over cylinder 6. It has 2 wires, and a small pipe going to the rear of the plenum?

Chris.

Chedder · Post by **Chedder** » Tue Sep 23, 2008 5:06 pm

It does have an over-run valve on the back face of the plenum, but it is the older style (no wires)
Chedder

ChrisJC · Post by **ChrisJC** » Tue Sep 23, 2008 6:54 pm

Oh, I don't know how they work, so I don't know if that could be a problem.

Chris.

Ian Anderson · Post by **Ian Anderson** » Tue Sep 23, 2008 8:51 pm

I have a similar problem - come off power/ decelerate through the gears and it cuts out. But "blip" the throttle as you drop into neutral and it idles forever!

I have never found out the reason and put it down to the cam and valve mix I am running on the std ecu - but it does bug me!

So if you find an answer please post it up!

Ian

kiwicar · Post by **kiwicar** » Sun Sep 28, 2008 2:13 pm

Ian
Sounds like you are getting fuel "puddling" in the inlet when you lift off, throttle closed but still pumping petrol into the manifold for the higher revs, blipping in neutral dumps the excess fuel out the exhaust and the mixture is happu after that. Any Flames

Mike

Ian Anderson · Post by **Ian Anderson** » Sun Sep 28, 2008 5:33 pm

Mike

Never noticed any flames - and don't get "loud backfires" as if there is excess fuel going trough to burn in the exhaust

Ian