low revs when starting

Tuning concepts, methods, tips etc.

Moderators: jsmcortina, muythaibxr

Post Reply
Javisupra
MS/Extra Newbie
Posts: 17
Joined: Sat Nov 26, 2022 12:52 am

low revs when starting

Post by Javisupra »

Hello, update to 36-2 in crankshaft sensor. now when starting the car. directly at 600rpm. Before, it went up to 1200rpm when cold and reduced the revolutions, with higher temperatures, can someone help me with my tune. what has changed?? Thanks in advance
Attachments
CurrentTune.msq
(273.92 KiB) Downloaded 8 times
retro1850
Master MS/Extra'er
Posts: 508
Joined: Mon Aug 03, 2015 8:03 am

Re: low revs when starting

Post by retro1850 »

Post a data log that was taken with the current tune. We need that to see what's going on.
Javisupra
MS/Extra Newbie
Posts: 17
Joined: Sat Nov 26, 2022 12:52 am

Re: low revs when starting

Post by Javisupra »

If the engine temperature rises, the revs increase and the AFR is set to 14.3. sorry for my English
Attachments
start.mlg
(701.11 KiB) Downloaded 8 times
start2.mlg
(724.72 KiB) Downloaded 7 times
2024-03-26_16.48.52.mlg
(643.55 KiB) Downloaded 6 times
sr4440
Helpful MS/Extra'er
Posts: 127
Joined: Fri Feb 12, 2021 4:56 pm
Location: Texas!!!

Re: low revs when starting

Post by sr4440 »

Ok, Let's look at the log, your log says your engine "is in cruise state", not in an "idle state". The reason is that your TPS is at 1.2% and under your engine state settings idle is set to less than 1%. The fix is simple, because your "closed loop idle settings" are using the "initial value table" and your "initial value table" is set to all zeros. This means that when you try to start it, it doesn't have any idle air and is getting all of it's air from the TPS which is opened too far.

My suggestion is to make your "closed loop initial value table" look like the manual, close your TPS, recalibrate your TPS and it should work. If you have a RPM flair up on start up lower the values in the "closed loop initial value table".
idle.JPG
idle.JPG (367.73 KiB) Viewed 300 times
clic.JPG
clic.JPG (69.28 KiB) Viewed 299 times
Javisupra
MS/Extra Newbie
Posts: 17
Joined: Sat Nov 26, 2022 12:52 am

Re: low revs when starting

Post by Javisupra »

Hello, and thanks for the help. TPS gauge And adjust the ilde map, but if I modify I don't notice a difference, now it starts at 1300rpm and goes down to 850rpm, it takes about 8 seconds. I would like 1100rpm when starting
Attachments
start mod.mlg
(985.53 KiB) Downloaded 5 times
CurrentTune.msq
(286 KiB) Downloaded 4 times
sr4440
Helpful MS/Extra'er
Posts: 127
Joined: Fri Feb 12, 2021 4:56 pm
Location: Texas!!!

Re: low revs when starting

Post by sr4440 »

Under "idle cranking duty/Steps", I would lower all the steps by 20 and see if that is better.

Joe
Javisupra
MS/Extra Newbie
Posts: 17
Joined: Sat Nov 26, 2022 12:52 am

Re: low revs when starting

Post by Javisupra »

thanks for your help, now it is correct
Post Reply