SD Idle Help with Big Cam

[PAT WS6]

Put together a fresh build with a trex cam, Factory Map. Ive been messing with the idle for a few hours now and i cant get it to idle on its own.
No Maf or O2 Sensors, but all the sensors are working correctly. I cant seem to control the IAC count very well it wants to go over 150 on its own. i demand it on scanner, but even then it doesnt seem to want to idle. I have to constantly give it throttle. I have all the correct injector data for factory 02 injectors 28.8#
Ive messed with the fuel and timing I dont think its that. I believe the MAF isnt failing i have the DTC's on 2 and ive tried 3. Still no luck.
The base running airflow seemed to be lower than most so I changed that as well.

Any help would be appreciated guys Thanks.

[SargeZ06]

That's a badass cam ain't it. I had one but swapped it for the RapTR.

[PAT WS6]

ya it was badass in my other car, i loved it. I just wish it would run great in this motor

[PAT WS6]

any help guys trying to get this thing on the road. i notice if i unplug the iac it runs smoother but wont idle on its own. t/b is NOT drilled

[Ben Charles]

I can help, what size cam and rest of mods. I do email tunes on here basically daily for customers.
PM me if you like


EDIT, just noticed its a Trex, (Thunder Racing grind? 242/248?)

EDIT again
I see your OL, also the MAF is not failed 100%, also you need more than 22 degrees timing, and some other Idle airflow tables are not correct.
How open is the throttle blade (TPS voltage?)

[PAT WS6]

tps is about 5.4v. Yes that is the correct size for the TR trex. How is the maf not failing all the way.
Do i need 35ish~ deg of timing?

thanks

[Ben Charles]

PM replied
set the dynamic airflow from 4,000 to max and the low and high map to 0 (on the same screen) and on DTC's uncheck the boxes and set to mil on first error (second will work too, but might as well fail sooner IMO)

[PAT WS6]

I will try that later this afternoon. Anything else you see off ?

[PAT WS6]

car is running much better but this cam still does not want to idle on its own i have to help it quite a bit.

[PAT WS6]

the car is starting to idle on its on but as soon as i touch the gas it wants to die. i dont think my maf and o2s are failing all the way. here is my most recent tune. thanks

[Throttle]

thats usually lean when it dies when u give it the gas.

[Ben Charles]

Command a richer value in the VCM controls and try it, i bet your going to have a TUFF time with OLSD (lean issues from heatsoak)

Does this issue happen on cold starts or just on restarts?

Dont leave PE commanding stoich either, your going to hurt your engine.

MAF fail needs to be set at 0, not maxed out and the p101 set to mil on second error not NO ERROR reported (Yep your still in MAF and it makes since b/c you have a factory MAF table, and your going to be lean at idle with that engine of yours)


Go ahead and zero out the MAF table just to make sure.

Fix this and it should run better

[PAT WS6]

what should i set my PE to? and what maf table do i need to zero out? airflow vs frequency?

[robbyredneck]

yeah, airflow vs freq set first cell to 1.7 and the rest to 0 and engine diag> airflow>maf fail high set to 0

[Cam72aro]

Activate real time tuning and tune the ve while its running. My t/a with a 91mm was having trouble idling and did some work on it tonight and its much better. I played with the fuel in the ve idling cells. I added and took away fuel till it would idle on its own. Then put it in gear and it would die. I kept adding fuel till it would stay running and hold an idle. It even fires up without having to crack the throttle. I know its still a bit off, buts its getting closer and closer.

[PAT WS6]

I dont have RTT on this one yet. if it still gives me trouble ill get it. gonna mess with it today since i have time.

[PAT WS6]

got the car running with exhaust and the car is lean. Ive changed the SES enable check mark on and off of the maf and o2 codes. Still no luck. with them checked its lean. but no matter how much fuel i add its lean. im adjusting the VE accordingly and its not seeming to do much.

The car has no vaccum leaks but sometimes i notice the idle will hold real high like ~2k rpms

[PAT WS6]

idle is the only part we are having trouble its lean as shit but once the car is in gear the afr is great. why is this only happening at idle?

[Throttle]

what did you do to your open loop EQ table??put it back to stock juast to try it,i am not saying its the fix

[PAT WS6]

i tried putting 1.13 across the table and 1.00. any other suggestions? What boxes for ses actually need to be checked for SD with no o2s