mspnp + stock tune popping at idle during track day
#1
Senior Member
Thread Starter
iTrader: (22)
Join Date: Oct 2007
Location: bay area, ca
Posts: 550
Total Cats: 19
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I installed a mspnp on my 97 a week ago. Ran it on a dyno on my stock car and got AFR readings and all looked good with the map that came with the mspnp. After about 3 sessions at Thunder Hill beating the crap out of the car with no problems I came back and heard random popping from the exhaust every 1-2 seconds. I'm stupid and didn't even try logging it before swapping in the stock ecu (didn't want to go home on a trailer), but I did notice the MAP line was slightly pinched in the engine bay. The stock ecu started, idled, and ran perfect after that. This is probably a waste of time to figure out without a log, but what could it be?
- pinched MAP line? I kind of doubt this since the car was running fine with the mspnp outside of the idle problem.
- changes due to higher than usual coolant temps and the tune needs to be adjusted?
- pinched MAP line? I kind of doubt this since the car was running fine with the mspnp outside of the idle problem.
- changes due to higher than usual coolant temps and the tune needs to be adjusted?
#3
Former Vendor
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,103
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I get the same thing. The engine bay heatsoaks, which heatsoaks the IAT, which causes the car to pull fuel and idle lean, which then causes it to misfire. No harm in it, it's just a bit annoying.
Thread
Thread Starter
Forum
Replies
Last Post