Lean Start issue

turbosl2 · Post by **turbosl2** » Mon Apr 17, 2006 5:58 pm

Jim wrote:Looks like you are running a Narrow Band 02 Sensor ,
so you can only guess that it is going lean .

You need to be more specific , when you say
"I'm tuning my AFR" , it sounds like you know what your AFR is .
You should say that you are adjusting your VE table .
You can only guess AFR with a Narrow Band 02 .

It could just as easily have the same symptoms from running to rich .

Your a brave man , trying to do this without a Wide Band 02 !!!

You are already running fairly rich to start with ,
because your choppy cam requires a richer mixture because of
exhaust gas dilution of the intake charge .
So you could easily be flooding your engine , especially because of opening
the throttle to try to save it from stalling ,
this should give a big AE shot and make things worse .

Have you watched your tail pipe ? or had someone else watch it ?
Any black smoke ?

I can't make a graph out of an xls file , but from looking at the numbers
it also looks like you are not running much Spark Advance .
A choppy cam allows you to dial in a good deal more advance at low speeds ,
this will make the engine much more responsive .
Also with a choppy cam you would be better off running your idle speed at
around 1000 to 1200 rpm , this can "fix" alot of things .

...................Jim

I am using a WB02 sensor, the LM-1. I didnt have it hooked up to the MS this time because i had the LM-1 on my seat as i adjusted the afr to get it dialed in first. I am not using the spark option in MS2, just for fuel, i am using my stock ecu and MSD for spark. I have the idle pretty much almost perfect as its gonna get with the cams, now i took a look at my AE enrichments in the MS2 programming and its set to 40%, because i set it high the previous day to work some other bugs out. Do you think the MAT sensor could be the problem, or does it look like a MS2 setting. Here is also a link to my tune.
http://serv01.siteground118.com/~albany ... icstorage/

Its called TomAfterPump.msq
2.33 code and MT 2.5
remember not to look at the ignition part since i am not using it
Thanks

Jim · Post by **Jim** » Mon Apr 17, 2006 6:59 pm

Your Link doesn't seem to work .

Get that WB 02 off the seat and hooked up !!!

You can upload your msq file directly to the forum and add it
to you message as an attachment .

...................Jim

turbosl2 · Post by **turbosl2** » Mon Apr 17, 2006 7:12 pm

MSEFI wont allow me to upload any more files for some reason. The link worked for me, not sure why it wont work.

turbosl2 · Post by **turbosl2** » Mon Apr 17, 2006 7:13 pm

I had the WB02 hooked into MS but i am not going to leave it there all the time, use the nb after i get a good tune

rs2000 · Post by **rs2000** » Mon Apr 17, 2006 8:13 pm

The link does work, i'll have a look at the logs for you

turbosl2 · Post by **turbosl2** » Mon Apr 17, 2006 9:35 pm

rs2000 wrote:The link does work, i'll have a look at the logs for you

Great, any recomendations would be appreciated.

Jim · Post by **Jim** » Tue Apr 18, 2006 2:32 am

Why are you going to change back to NB ?

turbosl2 · Post by **turbosl2** » Tue Apr 18, 2006 7:16 am

Jim wrote:Why are you going to change back to NB ?

I just use the LM-1 to tune the car then put the NB 02 back in, and need it to tune other cars i have and friends cars.

Jim · Post by **Jim** » Tue Apr 18, 2006 1:06 pm

OK

I hope your charging them , that's alot of wear and tear on your 02 .

turbosl2 · Post by **turbosl2** » Tue Apr 18, 2006 1:28 pm

any ideas on the lean start issue?