Fixing Idle?

Hendrick301 · Post by **Hendrick301** » Mon Jul 02, 2007 3:42 pm

Man I have a miss at idle. I am lost. If i rich it out at idle with nistune it makes it better but after slow down from a hard boost it stalls from being too rich.

It might be a vac leak, im thinking on the intake plenum, i dident put a lot of silicone sealent on the gasket...

I might tear it as a last resort. but i think its a injector setting for idle.

I dont think is a vac leak because when the fans turn on the idle is perfect. i think is a load enrich problem. I wonder if its a problem with the timing or idle circuit..

any ideas????

I have 420cc injectors, turbo 84 z31 ecu, walbro 255L fuel pump

Matt · Post by **Matt** » Tue Jul 03, 2007 2:57 pm

Have you tried adjusting injector latency at all when it is at idle?

Hendrick301 · Post by **Hendrick301** » Tue Jul 03, 2007 10:37 pm

yes, its at 255, but i thats the furthest it goes, if i lower it it gets worse

Bernardd · Post by **Bernardd** » Wed Jul 04, 2007 4:23 am

what kind of 420's do you have? you have 255 for the latency value? that value is too high. if you're using the mercedes injectos the value should be around 4B. you'll have to reset the kvalue most likely.

Hendrick301 · Post by **Hendrick301** » Wed Jul 04, 2007 5:01 am

Bernardd wrote:what kind of 420's do you have? you have 255 for the latency value? that value is too high. if you're using the mercedes injectos the value should be around 4B. you'll have to reset the kvalue most likely.

yes i have the benz injectors. whats a good range for the latency value? i have the k around 375

Hendrick301 · Post by **Hendrick301** » Wed Jul 04, 2007 5:02 am

oh sorry,

whats 4B? (im sorry im still new to this)

Hendrick301 · Post by **Hendrick301** » Wed Jul 04, 2007 6:18 am

ok 4b is about 75 on the scale...

ill try that.. is 375ish good on the k for the benz injectors?

Hendrick301 · Post by **Hendrick301** » Wed Jul 04, 2007 12:28 pm

Hendrick301 wrote:ok 4b is about 75 on the scale...

ill try that.. is 375ish good on the k for the benz injectors?

I did 75 on the latency and she runs soo smooth it feels like its not even running.

Wow thanks for the fix

Matt · Post by **Matt** » Wed Jul 04, 2007 1:48 pm

what was the K value from the injector resize adjustment you had before? sometimes this needs to be tweaked further in addition to using the adjustment box.

Hendrick301 · Post by **Hendrick301** » Wed Jul 04, 2007 3:48 pm

Matt wrote:what was the K value from the injector resize adjustment you had before? sometimes this needs to be tweaked further in addition to using the adjustment box.

it was 607 from the oem.

the "injector resize" changed it to 375, which I kept.