HELP Crane 14 CAUSING IDLE AF JUMPING

[SILVERFLASH]

So I have crane 14 and a aem uego and my af is bouncing a lot from 14.9 to 17.5 courious is this is common for these cams.

[Santiago.]

to 17.5? no

13.5-15.5 would be id say, normal. overlap (what causes lope) and non-stock cam profile is going to alter air being pushed through the cyl head.

[CrEaTrE]

I'm normally 12.5-14 at idle. I've been messing with everything but can't seem to get it any leaner. Only thing I haven't tried is getting rid of the stock cam gears for aftermarket. I'm doing that anyways, but I've had other necessary parts fail on me lately that require the money.

[HCCAFan]

How's the idle? Are you throwing any codes?

[SILVERFLASH]

I am aware of what the af is supposed to be and not sure if the cams would cause this jumping of the af ratio

[Santiago.]

to be simple and short, yes it will.

now if your cams lope at 0,0a good amount, your cam timing is off. and that will make things worse (jumping afr)

[HCCAFan]

The short answer is no.

[HCCAFan]

Quote: Originally Posted by Santiago.

to be simple and short, yes it will.

now if your cams lope at 0,0a good amount, your cam timing is off. and that will make things worse (jumping afr)

If the cams are right and the computer has learned, the answer is no. It is not normal for the cams to make the A/F jump.

[Santiago.]

regardless of if it learned or not, itll still jump.

go tell that to the other cammed srt's ive seen.

the pcm can learn only so much. but if you alter air flow in such a way that you are jumping from .327/.261 stock lift to a significantly larger .364/.354lift,and an offsetted duration then things arent going to be "like stock" idling..


aside from the baby 2.0 cams that ive used, ive never seen a cammed srt have a STEADY afr. always between 13.5-15.5

[SpeedEuphoria]

you may have a slight vac leak, which would cause the high A/F(because it will Not idle that high on A/F normally) and this would also cause your fluctuation. I had a bad TB gasket seal(just a corner) on my setup and did the exact same thing, it would idle Ok for the most part but when the rad fan kicked on it would lean out and be jumpy

[HCCAFan]

Quote: Originally Posted by Santiago.

regardless of if it learned or not, itll still jump.

go tell that to the other cammed srt's ive seen.

the pcm can learn only so much. but if you alter air flow in such a way that you are jumping from .327/.261 stock lift to a significantly larger .364/.354lift,and an offsetted duration then things arent going to be "like stock" idling..


aside from the baby 2.0 cams that ive used, ive never seen a cammed srt have a STEADY afr. always between 13.5-15.5

Agreed, kinda. But he said 17.5. So I still say no.

[HCCAFan]

Quote: Originally Posted by SpeedEuphoria

you may have a slight vac leak, which would cause the high A/F(because it will Not idle that high on A/F normally) and this would also cause your fluctuation. I had a bad TB gasket seal on my setup and did the exact same thing, it would idle Ok for the most part but when the rad fan kicked on it would lean out and be jumpy

Exactly why I asked about his idle.

[SILVERFLASH]

idle is fine no issues their 750 i think. Their is no codes and does not seem to be a rhythm to the jump.

[HCCAFan]

So you have been driving it and every time you come to an idle it does this? AND...there is no codes while driving, idling or ever?

[HCCAFan]

Not even a flashing CEL...?