Miata Turbo Forum - Boost cars, acquire cats.

Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   MEGAsquirt (https://www.miataturbo.net/megasquirt-18/)
-   -   Troubleshooting MSPNP2 and possible Idle Air Control Valve problem (https://www.miataturbo.net/megasquirt-18/troubleshooting-mspnp2-possible-idle-air-control-valve-problem-97727/)

kschaef65 08-09-2018 06:01 PM
Troubleshooting MSPNP2 and possible Idle Air Control Valve problem
 
We have been trying to troubleshoot for quite some time a 99 Miata with a FM2 turbo kit that generally runs well but has crazy RPM racing up to 4500 RPMs when it starts. It is tuned to e85. We have taken it to a shop in Chicago area and he is suspecting the Idle Air Control Valve does not work right or there is something faulty about the MegaSquirt. Does this make sense or has anyone else had this experience?

Stealth97 08-09-2018 06:49 PM
Yes. Check the cranking idle DC. Post your MSQ and a log of it happening

kschaef65 08-13-2018 09:04 PM
The tuner has solved the surging RPM startup. Dyno-tuned it for 93 octane. A new problem have surfaced in that the idle surges up and down between 1000 RPM and 1200 RPM. Believes there to be a vacuum leak or possibly a boost leak. Anyone had a similar experience with surging idle?

By the way, when I get the car back I will post the tune before and after problem solved so the community can benefit from it. Thanks for your suggestion Stealth97.

Stealth97 08-13-2018 10:28 PM
Originally Posted by kschaef65 (Post 1496368)
The tuner has solved the surging RPM startup. Dyno-tuned it for 93 octane. A new problem have surfaced in that the idle surges up and down between 1000 RPM and 1200 RPM. Believes there to be a vacuum leak or possibly a boost leak. Anyone had a similar experience with surging idle?

By the way, when I get the car back I will post the tune before and after problem solved so the community can benefit from it. Thanks for your suggestion Stealth97.
before you go hunting leaks, make sure the cells in the idle portion of your spark table are all the same- Differences here can make idle jump around.

sixshooter 08-17-2018 12:31 PM
Originally Posted by Stealth97 (Post 1496381)
before you go hunting leaks, make sure the cells in the idle portion of your spark table are all the same- Differences here can make idle jump around.
This


All times are GMT -4. The time now is 02:33 AM.


© 2024 MH Sub I, LLC dba Internet Brands