Low RPM warm start shudder

[mk5nate]

Hello everyone,

I am having this weird issue when I’d have a warm start and as soon as I go into drive and slightly tap the throttle to creep out of the parking lot the car will feel like it’s misfiring a little causing a jerk and the tone of idle sounds choppy a bit. It’s super weird but once I drive off it’ll go away and go back to normal. This is only warm starts. Anyone know what it could be ? I did sparks, injectors, and coils. No luck.
I am tuned on MHD OTS E40. This has been happening prior to being tuned. not sure if some of you can relate to this issue and found what it is. Thanks for the advice!

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[mk5nate]

Car will also not detect the misfire on MHD super odd..

 

[ShakaDaKine]

Have you tried disabling the start/stop function? Also, some of us were experiencing hesitation issues that could be attributed to traction control and/or software related. A few have posted that a software update remedied the issue.
How is your battery doing?

 

[mk5nate]

Have you tried disabling the start/stop function? Also, some of us were experiencing hesitation issues that could be attributed to traction control and/or software related. A few have posted that a software update remedied the issue.
How is your battery doing?

Battery is around 14-15 Volt and at 12 when off, I disabled the option I always turn it off when I start the car it’s like a routine lol. Could it be that? Might have to update but I am tuned id have to bench unlock again I assume

 

[ShakaDaKine]

Do a title search for "hesitation "...few threads on the subject. From there, you can determine if you think it's worth updating the software. I was experiencing hesitation from a stop and got an update...hasn't happened since.

 

[PikkaGTR]

Reset throttle adaptation in MHD app
I had this same issue but on cold start and cold days

 

[mk5nate]

Reset throttle adaptation in MHD app
I had this same issue but on cold start and cold days

I’ll do that, do I need to slap it in diag mode for that ?

 

[mk5nate]

Do a title search for "hesitation "...few threads on the subject. From there, you can determine if you think it's worth updating the software. I was experiencing hesitation from a stop and got an update...hasn't happened since.

I’ll look into them thanks!

 

[lucky phil]

Battery is around 14-15 Volt and at 12 when off, I disabled the option I always turn it off when I start the car it’s like a routine lol. Could it be that? Might have to update but I am tuned id have to bench unlock again I assume

12 volts with the engine off and no load is a half charged AGM battery. It should be 12.8 volts+ fully charged no load. How old is the battery?
Phil

 

[mk5nate]

12 volts with the engine off and no load is a half charged AGM battery. It should be 12.8 volts+ fully charged no load. How old is the battery?
Phil

5 years old haven’t swapped since I got the car 2020 Supra

 

[lucky phil]

5 years old haven’t swapped since I got the car 2020 Supra

Time for a new battery. Try a load tester on it. They are about $50 to buy.

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