Getting some serious hesitation from engine throttle

12182 Views 35 Replies 21 Participants Last post by gtrfleek, Mar 2, 2020

vampyr

Discussion Starter · Nov 28, 2012

I would like to know if anyone else has had a similar issue... and if so, what I need to do to avoid it.

From a complete stop... when I step on the throttle the car moves forward, then suddenly power kinda fades from the throttle and them comes back. It's so bad sometimes that I was actually worried someone was going to hit me in the intersection. The car does NOT stutter or lose actual electrical power.... it's more like your typical turbo lag, only it seems worse than it should be. I've had a car with a turbo (2005 STi) and NEVER experienced that sort of turbo lag that cause the car to hesitate for 3 seconds before the power kicked in. I'm not launching the car or anything (I've actually tried using launch control on this car with VDC off and it is a joke... barely revs up to 2k rpm)

I'm just wondering what could cause this? difference in outside temps? maybe the car isn't warmed up completely due to colder weather?

Thanks all!

21 - 36 of 36 Posts

WingedBeast1968

· #21 · Jun 14, 2015

Compression is just that. It holds the max pressure attained when cranking. There's a one way valve.
Leak down is a constant pressure test, where the leakage is given as a %.
They both give you info on gas tightness of the cylinder, but the leak down enables you to determine where it's leaking.
Inlet valve - blowing at the throttle body.
Exhaust valve - blowing at the tail pipe.
Piston rings - blowing out the dipstick or oil filler.
Head gasket - bubbles in the coolant or crank case pressure.

gyoja

· #22 · Jun 14, 2015

WingedBeast1968 said:
Compression is just that. It holds the max pressure attained when cranking. There's a one way valve.
Leak down is a constant pressure test, where the leakage is given as a %.
They both give you info on gas tightness of the cylinder, but the leak down enables you to determine where it's leaking.
Inlet valve - blowing at the throttle body.
Exhaust valve - blowing at the tail pipe.
Piston rings - blowing out the dipstick or oil filler.
Head gasket - bubbles in the coolant or crank case pressure.

So if you do a leak down test first the compression test is moot. You will get a sense of how well each cylinder is doing.

Right?

Evolution84

· #23 · Jul 19, 2015

any one ever find a solution for this? I have it too once in a while ill be at a stop sign or something and gently push the gas and it seems like it wants to not go for a sec and hesitate then just goes all of a sudden. in auto fyi, it doesnt happen enough and cant really replicate it too to see if manuel helps or why it only does it once in a while randomly from a stop.

Evolution84

· #24 · Jul 19, 2015

gyoja said:
So if you do a leak down test first the compression test is moot. You will get a sense of how well each cylinder is doing.

Right?

Right to me a leakdown test is a fancy compression test both do basically same thing. but leakdown seems to be more helpfull in finding the problem and not just telling you that you have a problem..

CK1988

· #25 · Apr 10, 2019

Anyone figure this out?bump for old thread. I face this issue for 5 years. No any warning light.

archan

· #26 · Aug 24, 2019 (Edited by Moderator)

I think this is related to the transmission. The car seems to believe something is up with the clutch. I am facing similar issues, but I get No errors at all and can see throttle pedal value change (ecutek).

gtrfleek

· #27 · Aug 26, 2019

I have this as well.

id say to everyone look to see what gear your car is in when you try to leave from a stop without completely stopping. my bet is it will be in 2nd still then when you give it gas the power comes on then goes off lifeless, then back to life again. it needs to shift to first. which depending on the circumstances wont happen.

Mine started doing this when I flashed the cobb optimized shifting map to the TCM.

on the stock TCM map it doesnt do it. Now I just know its coming and wait at the stop light or sign for extra bit to allow it to select first on its own.

240Z TwinTurbo

· #28 · Aug 28, 2019

gtrfleek said:
Mine started doing this when I flashed the cobb optimized shifting map to the TCM.

on the stock TCM map it doesnt do it. Now I just know its coming and wait at the stop light or sign for extra bit to allow it to select first on its own.

I have this issue as well so I believe it to be transmission related. Here are the things I see that trigger the issue.

Leaving my bank has a steep incline so as I stop before leaving and then quickly try to pull out I can hit the throttle and it delays for about 2 seconds before accelerating. I've had it actually kick into limp mode a few times (not recently) and had to be reset. I should probably try to kick it into limp mode again so I can check out the code.
If I come to a sudden "almost" stop and then try to accelerate it hesitates
As I come into my driveway at an angle and the car jerks back and forth it will also hesitate going up my driveway

It feels as if the tranny fluid level is low and the pump is starved for a second due to incline/stop/jerking so I purchased 2 quarts of fluid. My car leaks no fluid, but it is the original trans and fluid from 2009 :nono:. I will try to add at least another quart and see if it resolves the issue.

WingedBeast1968

· #29 · Aug 29, 2019

Let us know :thumbsup:

haul s

· #30 · Aug 30, 2019

gtrfleek said:
I have this as well.

id say to everyone look to see what gear your car is in when you try to leave from a stop without completely stopping. my bet is it will be in 2nd still then when you give it gas the power comes on then goes off lifeless, then back to life again. it needs to shift to first. which depending on the circumstances wont happen.

Mine started doing this when I flashed the cobb optimized shifting map to the TCM.

on the stock TCM map it doesnt do it. Now I just know its coming and wait at the stop light or sign for extra bit to allow it to select first on its own.

Yup, noticed the same thing after I flashed Cobb's optimized shift TCM map. First time it happened I almost got t-boned, after I pulled out to make a left and the car cut all power. That was a tense couple of seconds that felt like an eternity, before it actually downshifted to 1st and took off.

Cobb has raised 2-1 downshift point in its optimized map. I contacted their GTR experts support about this, and they sent me an updated map with stock 2-1 downshift point. Everything is back to normal with this map for me.

240Z TwinTurbo

· #31 · Sep 2, 2019

WingedBeast1968 said:
Let us know :thumbsup:

I spent about 45 minutes and added 2 quarts of fluid to the tranny, which was pretty simple. Just remove the 4x 10mm nuts holding the heat shield and remove the fill plug. The nipple on the containers for trans fluid just slip into the tranny fill hole and takes about 4-5 minutes per quart.

Anyway, drove the car around and was unable to make it hesitate like it normally does and the driveway entry makes it hesitate 95% of the time. However, went up the driveway twice and it had zero hesitation. I am not saying that topping off the fluid resolved the issue, but it did not do it this time. The alternator in my EVO went out so I will be driving the GTR for a few days and will report back if I have the issue.

For those that have the issue try logging your throttle position and see if the ECU is cutting throttle when this is happening.

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Wicked

· #32 · Sep 3, 2019

240Z TwinTurbo said:
I spent about 45 minutes and added 2 quarts of fluid to the tranny, which was pretty simple. Just remove the 4x 10mm nuts holding the heat shield and remove the fill plug. The nipple on the containers for trans fluid just slip into the tranny fill hole and takes about 4-5 minutes per quart.

Anyway, drove the car around and was unable to make it hesitate like it normally does and the driveway entry makes it hesitate 95% of the time. However, went up the driveway twice and it had zero hesitation. I am not saying that topping off the fluid resolved the issue, but it did not do it this time. The alternator in my EVO went out so I will be driving the GTR for a few days and will report back if I have the issue.

For those that have the issue try logging your throttle position and see if the ECU is cutting throttle when this is happening.

$10 hand pump is what i used lol.

240Z TwinTurbo

· #33 · Sep 3, 2019

Wicked said:
$10 hand pump is what i used lol.

I have the hand pump and had it standing by, but too much work since I can just fill it directly from the bottle.

hksrb25s14

· #34 · Feb 29, 2020

My 2019 stock is hesitated at low rpms, don't know why, I'm also getting a high pitch buzzing sound coming from the engine side maybe underneath, I don't know what's happening. The hesitation usually stops when the car is warmed up or driving for more then a haft hour. On a cold start I warm up the car to 5- 10min.

Thanks guys in advance.

240Z TwinTurbo

· #35 · Mar 2, 2020

240Z TwinTurbo said:
I spent about 45 minutes and added 2 quarts of fluid to the tranny, which was pretty simple. Just remove the 4x 10mm nuts holding the heat shield and remove the fill plug. The nipple on the containers for trans fluid just slip into the tranny fill hole and takes about 4-5 minutes per quart.

Anyway, drove the car around and was unable to make it hesitate like it normally does and the driveway entry makes it hesitate 95% of the time. However, went up the driveway twice and it had zero hesitation. I am not saying that topping off the fluid resolved the issue, but it did not do it this time. The alternator in my EVO went out so I will be driving the GTR for a few days and will report back if I have the issue.

For those that have the issue try logging your throttle position and see if the ECU is cutting throttle when this is happening.

Just to update it started doing it again when I enter my driveway at an angle or do a sudden stop and then try to accelerate again. I'm thinking it is likely the filter needs to be changed in the tranny so I will probably do that soon. My car is an MY09 with ~25K miles and I have not even changed the trans fluid or done the TSB for the clips! :nono:

gtrfleek

· #36 · Mar 2, 2020 (Edited by Moderator)

solved it.......

A member reached out to me some while back with some dealings he had with cobb. He explained it was identical to what i was experiencing and I just needed to reach out to cobb and explain exactly what it is and they will update your tcm file for you.

Reached out to cobb, they told me no go to a pro-tuner. I said it's a problem, a bug with your software.....

No response.

Fast forward. At this point i'm basically ready to switch to ecutek (which i just did anyways hahaha) so I decided, if I reach out and they don't help me, ill switch, if they do ill stay.

So sure enough the person from cobb responses with a updated LC5 map specific for my car.

Flashed it and shes never done it again. period. I notice the change he made. like @HaulS said they changed the 2-1 downshift pattern to oem, so it wont try to select first too early and eff up like its been doing, all so your left with zero response unless you let off..... THAT IS GONE!

anyways that solved it.

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