rev 1 hesitation

[adamh]

its the ISC valve thats leaking coolant. it has to be this thats causing the hesitation. re-bleed again tommorow and tighten with a jubilee clip this time.

[adamh]

no.. timing is at 10 degrees b4, coolant re-bled o.k... new dizzy cap and rotor, why are the revs still bouncing when I pull back the throttle.. anyone any ideas?

[GaryA]

Is it only at one throttle opening or can you rev through it ? Checked the airflow meter ?

[adamh]

I can rev through it. but it will also do it at higher revs.. its like hitting fuel cut.. but happens exactly 2krpm.. and if I go higher sometimes then.

[Sponge Bob]

Yeah - maybe the AFM is a little sticky??

[adamh]

how does the isc .. idle speed control valve work exactly.. just trying to rule it out.

[GaryA]

http://www.mr2-tech.com/bgb/mechanic...efi_system.htm How about disconnecting it

[adamh]

i dont think is that now.. the idle on initial start up is 16/1700 ish.. it then drops very nicely nicely down to 1krpm / 900 when warm.. the ISC controls the idle speed very well. i can see it draws and controls air from before the throttle plate when idling.. so i cant see how it would have any effect when throttling. however i will take disconnect the isc plug and block the air feed pipe to see what happens.

[adamh]

does anyone know where this purple widget connects?. one side pipes off to tvis vacuum actuator (connected).. the other side you can see is not connected.. ?

[adamh]

hmm check out the last bit (fuel cut rpm) of that efi section of the mr2-tech.. something about fuel cut at 2krpm..and returning at 1600.. its a bit familiar to be a coincedence.. well thats exactly what the motors doing in normal operation .. but how?!