Revving on its own.
#1
Senior Member
Thread Starter
iTrader: (1)
Join Date: Feb 2006
Location: Detroit
Posts: 1,234
Total Cats: 0
Revving on its own.
With a ton of help from the_pipefather my MS is up and running. There is one problem we couldn't figure out. Sometimes I will start the car and it will rev from 1k-2k up and down up and down. Other times it will go about a 1/2 mile and start doing it. When it does that it drives normal and everything, it just revs up and down. So far there is no pattern it is just random. When it does it I can just turn off the car and restart and it is fine.
I did some research and found it could be a vacuum leak or a faulty TPS. I have double checked that it is not a vacuum leak, and if it was I think it would always happen. I'm still on the 5 speed on/off TPS. I will be putting in a VTPS as soon as I can get one.
This happens maybe 1 out of 5 starts, so it is pretty annoying. My IAT sensor is right before the throttle body, is that poor placement? Any ideas?
I did some research and found it could be a vacuum leak or a faulty TPS. I have double checked that it is not a vacuum leak, and if it was I think it would always happen. I'm still on the 5 speed on/off TPS. I will be putting in a VTPS as soon as I can get one.
This happens maybe 1 out of 5 starts, so it is pretty annoying. My IAT sensor is right before the throttle body, is that poor placement? Any ideas?
#12
is it possible for you to log this when it happens so we can change the recovery settings to match the rpm oscillations?
These are the settings we are using right now:
Deadband : 50 rpm
Upper limit: 280 rpm
Lower limit: 100 rpm
Fast recovery: 15
Slow Recovery: 100
Closure Speed: 2
Startup Delay: 2
These are the settings we are using right now:
Deadband : 50 rpm
Upper limit: 280 rpm
Lower limit: 100 rpm
Fast recovery: 15
Slow Recovery: 100
Closure Speed: 2
Startup Delay: 2
#13
Senior Member
Thread Starter
iTrader: (1)
Join Date: Feb 2006
Location: Detroit
Posts: 1,234
Total Cats: 0
I can try getting my laptop to link up. It happened last night on my way home. The injector settings are working, it started right back up.
#15
Mine does the same idle-bouncing with MS as it did with the stock ECU. If messing with the idle recovery doesn't help, I can bet you it's the IAC going bad as it eventually does on almost every Miata.
Head over to m.net and search "idle droop" in the NA/NB forums. There's an easy way to clean the passages and test the voltages to see how healthy the unit is. A new one is like $350 or you can get one off a parts car for cheap... or you can just deal with it. Mine's done it for 30k miles and I don't even notice it anymore.
Additionally, how would one go about adjusting the IDLE RECOVERY settings. What does each one of those settings do?
Head over to m.net and search "idle droop" in the NA/NB forums. There's an easy way to clean the passages and test the voltages to see how healthy the unit is. A new one is like $350 or you can get one off a parts car for cheap... or you can just deal with it. Mine's done it for 30k miles and I don't even notice it anymore.
Additionally, how would one go about adjusting the IDLE RECOVERY settings. What does each one of those settings do?
Last edited by samnavy; 07-08-2008 at 03:38 PM. Reason: .
Thread
Thread Starter
Forum
Replies
Last Post
davechaletzky
Prefabbed Turbo Kits
15
10-11-2007 11:57 PM