epfatboy

iTrader: (3)

Hey all,

Got a stick car with a gen3 6.0 that we just got up and running on Holley’s Terminator X. It has a Small cam and injectors and the software seems to be doing its thing pretty good.

One problem I have is the RPM hangs when I come off the throttle. It’s a DBC stock throttle body. The RPM’s start to drop in 2-3 seconds but obviously that’s no good.

Any suggestions where to look or what to tweek?

we are just starting to go thru this tuning process for fueling and haven’t messed with much of the stuff just yet outside of the normal wizard/configuration for injectors and such. Haven’t even touched the timing yet!

B52bombardier1

Vacuum leak. This screams vacuum leak somewhere. Check the edges of your intake manifold and throttle body with the engine running for leaks. An unlit but flowing propane torch or some starting fluid ether "explosion in a can" stuff can also help you find the leak. Keep a fire extinguisher handy.

Rick

Darth_V8r

iTrader: (4)

Cut airflow from follower and cracker.

As to vacuum leaks. Best method involves a cigar and a glass of whiskey. Smoke the cigar and puff into the intake. Through the throttle and immediately let the blade close. After a few puffs you will see every leak you have.

The whiskey is necessary because nothing goes with a cigar like a good whiskey.

epfatboy

iTrader: (3)

Never thought to add whiskey to troubleshooting a vacuum leak, feels like that might accelerate wanting to throw ****!

thanks for the replies, I’ll take a look!

QwkTrip

iTrader: (23)

You need to dial in the base airflow at idle (throttle body stop and IAC activity). After that play with the IAC ramp down settings. And just do some tuning in general before you jump to conclusions.

79LS1FOX

iTrader: (11)

Never thought to add whiskey to troubleshooting a vacuum leak, feels like that might accelerate wanting to throw ****!
LMAO.....

Firebirdmuscle

iTrader: (16)

Check the iac hold position. Sounds like some adjusting in the whole iac ramp down section is needed

epfatboy

iTrader: (3)

We were just looking at this today.

I'll try to get the values and report back shortly.

Another question I had was about the IAC logging value, should it ever be 0%? The value changes with light throttle changes in park but ultimately returns to 0%.

Firebirdmuscle

iTrader: (16)

Never want 0 or 100. If you are at either of those, you don’t have control over it. If your idling with it at 0. Look at the iac parked table and/or tb set screw could be open to far

epfatboy

iTrader: (3)

TB set screw was open and is now is all the way closed and both times the IAC reading was 0, This is a used TB, maybe it's defective but it is working coming off an at idle throttle blip so I guess I don't really know what to think. We'll throw a new IAC in there an see what happens. We also have a high rpm flair on idle for like 4-5 seconds we were chasing but I think we should get the iac to respond properly before we chase that.

If you haven't already guessed this isn't my car, I'm trying to help a buddy out and get his car working like it should. I'm a novice tuner at best and learned on HP Tuner. The Holley Term X Kit is really great at getting you in the ballpark really fast! I think it's just a matter of messing with **** until we get it right... Thanks for all the help here.

FYI, this is a 6.0 truck with a small Cam and FIC Injectors in a 71 Nova with a Nissan 6 speed manual, he says the car rips thru all the gears, we just need to work thru a few little things..

ALSO:
Not sure what my buddy changed but he says the RPM hang he was getting is now gone. It was not a vac leak.

Darth_V8r

iTrader: (4)

Was the throttle body ported? Sounds like the blade is not sealing

epfatboy

iTrader: (3)

probably not, it was pulled from a stock truck but you never know. My buddy has a few other TB’s hanging around, if a new iac doesn’t do the trick another TB is a quick swap.

We’ll double check the blade/throat too for build up or obvious issues.

Thanks for all the suggestions!

BroncoBri

🤨🤨🤨 lame! And used up. To the Nth degree. Lmao! Also most likely no the issue. Chased my tail with garbage motors info. Turned lut to be in the tune. Hun?? Whaa? Pfftftftftf. Everyone has an ******* er i mean opinion. lol