a/f ratio on startup

[vr6turbo 27]

Hi all

need to know what the start up a/f ratios should be, 

having trouble with my over fuelling

 

also the values of

 

the maf  flow rate at cold idle say 1000 rpm

lambda voltage at cold idle

 

Blue temp sensor checks out in vag com using the dash gauge as a guide.

 

using an AEM wideband, on start up it shows an A/F of 10.2 far too rich imo

 

that's stock ECU

obd1 dizzy

stock injectors 

any info to help me on my way would be great

 

 

 

 

 

 

 

 

[FishWick 21]

Standard engine?

 

They do run pig rich from cold and 10 doesn't sound too far off from memory.  Are you letting the AEM warm up for a couple of minutes before cranking it over, as it takes time for the O2 heater to get it up to temp?

[vr6turbo 27]

Hi

thanks for the reply

stock engine apart from forged low comp 8:5:1 pistons

obd1 dizzy no cat

I pin tested all the sensors from the ecu connector and found a few issues (grounds mainly)

as well as checking the fuel pressure and finding it

6psi down, a new regulator sorted that, and it no runs a treat

about 11.2 to 11.5 on start up

also ticks over a lot better and revs nicely,

time to connect the charger.