I have an issue where my car will hiccup intermittently at low loads. It only happens after the car is warmed up after some hard driving. I haven't been able to capture it in a log but it looks like the car totally leans out for a split second. I am not positive it is the tune because it doesn't happen consistently but intermittently.

I have newer plugs and replaced my tps, and coil packs. I also performed a valve adjustment again and hardwired my injectors which used to cause misfire and change my battery.

I was reading on the Supra forum and alot of guys were having the same issue and it was unresolved. Was wondering if anyone here has had this issue and if they were able to pin it down.

 

Same issue, runs awesome, happens under light load and I don’t even see my wideband catch the lean spike although I’m sure it’s there.

 

Turn off lamda feedback and see if the issue still occurs. If the issue goes away the lamda PID settings are incorrect or your VE table is far off at that particular section.

 

I can confirm that cells are tuned in a steady state, and double-checked. No big swings in LAMBDA feed-back. I use MegaLog Viewer HD Pro for all EFI analytics and collected histograms (with all tip-in and enrichments set to nul) over the past few years as I keep an eye on my tune and everything checks out.

Weird hiccup but oh well. Clearly a known issue.

 

I run Infinity in my Integra and haven't noticed this hiccup . In my s2k i run a V1 Aem and it will do this hiccup thing on occasion . When it does the hiccup thing , it goes dead lean on the wideband ..... Interesting .

 

I have a similar issue. Usually just cruising at low load and it will hiccup/misfire one random time then its fine. I can't recreate it and it rarely happens. I just assumed it was in the tune, but since I cant recreate it I haven't brought it up with my tuner.

 

I want to point out that it's during the feathering and a steady throttle.

It's me cruising @ 25mph OR 45mph, steady, and a HICCUP, and back to normal.

It's not that all of us who responded to this thread are in some low-mid-hard throttle transitioned into a poorly tuned fuel cell. It's weird.

 

It's definitely not a bad tuned cell because it happens intermittently and only when warmed up after a drive. It's not decel fuel cut because that's only set to happen at like 1 TPS.

Latest thing I tried is to upgrade firmware to 96.5 and got new sparkplugs leaving stock gap. I also lowered the smoothing ok some sensors because the tuner maxed them out. I have not experienced again yet so crossing my fingers.

 

Is this hiccup a pretty rare occurence? I'm looking to switch over from Flashpro and kind of a shame to hear there's some kind of bug causing this but nothing's perfect.

 

It's rare but it happened today as I was cruising in traffic @ 45mph for 10+ minutes in 6th gear jamming to tunes. I was not modulating my throttle but it happens.

Could I be more proactive and just data log everything and catch it in action? YES. Do I care enough to do it at this point given the car runs fantastic that hiccup aside? NO.

Do I want to find out what it is, of course, I am curious and a perfectionist but it's so so unpredictable I just don't want to be running around data logging at 20hz at all times. Get's old.