Search:

I did not post my tune or log because my question was more based on system operation vs tuning. But at your request, I have attached it now. See near end of log file when RPM drops to about 200 rpm...

Yes, I agree. I have tuned several of our race cars with Holley EFI and Bigstuff. These engines have significantly larger cams and I have never had any issue with idling whatsoever.

Thanks for your response.

I believe 0.4% does cause a difference in the operation of the system because the Throttle Follower Airflow Table typically has lower cells that only activate on 0.0% not...

LS6 in 69 camaro. cam, heads, manual t56.

Having issues with engine stalling/rpm diving periodically when car is coming to a stop or coasting. The TPS seems to hang at 0.4% at times instead of...

Thanks for the info. I will give that a try also.


So far I took out changes made in initial post.

I then changed the adaptive idle airflow Max Offsets to 4lb/hr (P/N, gear, A/C on and OFF,...

added another log when engine dies at 24mph coast in nuetral. I also logged IAC values

Not sure which parameters to try to tweak next.

LS1 in 69 camaro, manual trans.

When I am coasting to a stop in neutral and engines comes down to idle, if the ac clutch engages the engine rpm...

Does the cranking spark table give the actual spark advance during cranking or is the number in the table added to the Main Spark Table to give actual spark advance during cranking?

That seems correct. I tried running in PE mode at idle and that seemed to help. The commanded afr was 12.8, but wideband showed 13.8 and the hesitation is gone, but car was to die worse when...

How is the commanded AFR calculated at idle in closed loop?

Engine:

346 ci LS6 Chevy
AFR 205 Heads
Comp Cams xr281
SLP Oil Pump and chain
Canton Pan
Canton Remote Filter
Harland Rockers
Katech Coil Mounts

Here is a log with my wideband hooked up. As soon as the system goes to closed loop the AFR goes from ~13.8 to ~15-16!

THe commanded AFR is 14.6, but running a lot leaner at idle. What might...

Is there a parameter that allows for a delay after startup (hot or cold) before closed loop is enabled?

Where is it?

I appreciate your advise and will consider. But the car runs well aside from this one issue and the tune you are viewing was dyno tuned by SPEED INC and paid $$$ for it. I hate to think it was no...

I attached a log file. I set the Airflow vs rpm to stock.

What I noticed is that when I first start the engine cold the throttle response is very good, but as the car warms up the trottle...

PLease explain torque managment suggestion?

Mash it in neutral.

Suggestion for VE in the 1200-1800 range?

I will try your sugggestion long with taking a log.

Tune attached!

bump

Not so much hesitation, the rpm climbs relatively slow, kind of like if I were opening the throttle slowly vs a quick rev.

Responds like a carburetor with no squirter!

HP tuners/stock ecu are...

The issue I am having is the the trottle seems slow to respond when coming off an idle. When I just try the rev the engine when in neutral it seems to lag or take a while to come up on RPM...it is...

I attached an unmodified tune that wait4meperf did and a log file that was done in SD mode (no MAF).

The engine dies when running in closed or open loop.

I was able to get used to driving it so I acquired some data. 50+ cells is hard to get, so I drove til I got 50+ at typical driving then I used the rest of the data at <50 hits to try to smooth the...

I have programmed pcm for sd tuning with wideband and I am trying to log AFR error. Unplugged MAF, disabled ltft's etc.. I am trying to hit 50+ times per cell.

Problem is that car wants to die...

I am having an issue where the motor will no return to idle until I hit break pedal (which loads power steering pump (running hydroboost)). When I come to a stop the motor will stay at about 1500...