revs drop off

[8oyd]

hi all
just after bit of advice or if anyone else has experienced the same thing, when i pull off say from petrol station and then put the clutch in the revs drop almost to stall, and a couple of times it has, but on tick over it will idle fine.....

any thoughts?

 

[fq-craigus]

What dump valve do you have? Is it a recirc type? Evos don't like vta valves without mapping

 

[8oyd]

its forge, it has started happening since its been on the rollers about 7weeks ago, was all ok then couple days after i noticed it. im not sure if its a recirc type.

 

[fq-craigus]

Well if its a recirc type you way to check the screw in the end if its a vta (vent to atmosphere) you want to have it mapped again could be the change in temp

 

[8oyd]

yeah it does have a screw on end,thanks for advise,ill get back on rollers see whats what, cheers

 

[fq-craigus]

If there is a screw in the end screw it out some, that should stop it stalling. No probs mate

 

[dan2926]

What dump valve do you have? Is it a recirc type? Evos don't like vta valves without mapping

+1 i had similar issues. changed my dv from a vta to a recirc and had no probs since.

 

[Dirtmatt]

lambda sensor could be on its last legs.. this would cause that issue with revs drop off and it struggling to "catch" the revs when letting off.. I thought it was the HKS dump valve when I fitted it. Now and again the revs would drop and the car would nearly stall when pulling up at a junction or in track.

waiting on a replacement so hopefully will sort the issue.