RPM drops to Zero when shifting from 2nd to 3rd

[nwbDSM]

sorry if this has been covered before, but I don't know how to search this issue.

Anyone has had an issue that the car stalls or the RPM drops until it stalls when shifting from 2nd to 3rd. I happened to me once in a while, I could not seem to simulate it again. But, if my memory serves me correct, it happened when I do a quick shift from 2nd to 3rd (at about 3 - 4k rpm). So, when I'm let off gas pedal quickly and as soon as I press on clutch pedal, the RPM drops (like normal), but it drops to ZERO. When I shift slowly, there is no issue at all.

I felt like the fuel is cut off rather than the car stalls. I can restart it right way.

I hope this makes sense.

 

[cliffkemp]

If you are venting to the atmosphere, this could be part of the problem but would happen in other gears as well. Usually, if you let off the gas first then press the clutch, the car should stay on easily. It is when you press on the clutch and in low rpm and you press the clutch before letting off the gas, the engine will run a little rich and possibly cause it to stall. Dont know your mod(s) if any, so not much anyone can say to help you with.

 

[rlacasse1]

What year and model?

If it is a turbo model do you have your BOV recirculated?

 

[cliffkemp]

I saw gsx on his profile but, dont know anything else about the car. I bet he vents to the atmosphere and shifts in a way that causes it to go dead if his car still has stock idle of around 700 or so.

If it is stock and recirculated, sounds like he has a leak somewhere in the intake after the turbo.

Hopefully, he will give more information soon.

 

[nwbDSM]

I saw gsx on his profile but, dont know anything else about the car. I bet he vents to the atmosphere and shifts in a way that causes it to go dead if his car still has stock idle of around 700 or so.

If it is stock and recirculated, sounds like he has a leak somewhere in the intake after the turbo.

Hopefully, he will give more information soon.

Thank you all. Sorry, I haven't got a chance to update my profile yet as I'm also updating my car.

To answer some questions, the car is 98 GSX w/ 16g turbo. No, I don't vent to atmosphere. It's recirculated w/ Greddy Type S BOV. But, you are right the idle is still stock at 700 RPM. That could be it though. Coming to think of it again, it sounds like what cliffkemp mentioned. I think "Yes", if I press on the clutch earlier than letting off gas pedal, the RPM would drop directly to zero.

Do you think I should try to up my idle to 900, I have DSMLink?

 

[cliffkemp]

you could up the idle but, sounds like you have a leak in the intake after the turbo. I would check that first. If you recirculate, it should not die like that. My car has a 16g and it vents to atmosphere but, it is this way as I bought it this way and going to fix to recirculate soon. How much boost are you running? AFR? and have you had it dynoed?

 

[Ghost_GSX]

I would suggest a boost leak test

 

[rlacasse1]

I would try and have to idle higher. Aren't they suppose to idle around 900 or so?

 

[cliffkemp]

I would try and have to idle higher. Aren't they suppose to idle around 900 or so?

Nope, stock idle is around 650 or so. Most idle around 700 after they break in good. Most modded ones idle high due to problems that are unsolved or bad mods done to the car. Sometimes, the driver is not that good with a manual and will set the idle higher just keep it from stalling on a lazy start. From the factory, they idle around 700.

 

[nwbDSM]

you could up the idle but, sounds like you have a leak in the intake after the turbo. I would check that first. If you recirculate, it should not die like that. My car has a 16g and it vents to atmosphere but, it is this way as I bought it this way and going to fix to recirculate soon. How much boost are you running? AFR? and have you had it dynoed?

All right, I guess I'll have to wait and see. I'll do all the tests later because I soon will be installing FMIC, AFPR, bigger injectors (720 cc), and having it tuned. This way I can do a BLT after everything is installed.

I guess I also need to adjust idle to 900, according to ECMLink demo

Thank you for all suggestions. So, now I have some ideas what might have caused this.

 

[rlacasse1]

Hmmmmm. Thought is was a little higher than that. 700 seems a little low.