Off Rev issue

My1969boss · Post by **My1969boss** » Thu Jul 16, 2015 6:49 pm

When i Rev my car up and let off the throttle it wants to die, it stumbles around trying to find the right rpms. I know my timing isnt spot on, but i wouldnt think that would play that big of factor..
Im also trying to sort this out before i start with the auto tune, Thats a whole story in itself..

91 Mustang 302 single turbo

My1969boss · Post by **My1969boss** » Tue Jul 21, 2015 9:26 am

anything will help

Matt Cramer · Post by **Matt Cramer** » Tue Jul 21, 2015 10:54 am

My1969boss wrote:I know my timing isnt spot on, but i wouldnt think that would play that big of factor..

It can. Fix that first.

TunerStudio is not displaying the AFR correctly in the log - please be sure you have the O2 set to wideband under Project Properties.

My1969boss · Post by **My1969boss** » Tue Jul 21, 2015 12:11 pm

Fixed the project properties/ wideband..

Would that also cause me to run lean when i start the auto tune? It was going so lean that i would go back and put my own numbers in.

Afr was going to 17.1

kaeman · Post by **kaeman** » Fri Jul 24, 2015 3:41 pm

yes if the megasquirt doesn't know the real settings for the wideband, it will make all kinds of bad corrections.. remember like any computer... its only as good at the data it receives, check the wideband settings make sure they match the output settings of the controller etc. don't forget to calibrate the unit in free air before doing your tuning.... it will save all kinds of headache in the future.

also bad timing will adversely affect your idle and how easy it returns to the idle state.

My1969boss · Post by **My1969boss** » Mon Jul 27, 2015 5:42 pm

Ok thanks for your input, i have changed the settings in my laptop but not have had a chance to go to the car and see if theres a major difference..

My1969boss · Post by **My1969boss** » Thu Jul 30, 2015 4:28 pm

Ok, with the other issues fixed, i now have another one that came up..

My TPS is out of whack... keeping the car running the tps will go from 20% all the way up to 110% and when it goes back to 20-30% it starts acting weird..

I was late on getting the data logging started but you can see it happening in the file.. I have tried to recal the tps in TS but makes no difference...

Matt Cramer · Post by **Matt Cramer** » Fri Jul 31, 2015 5:32 am

Where is the TPS grounded?

My1969boss · Post by **My1969boss** » Sun Aug 02, 2015 10:24 am

Still has all factory wiring. It's a MSPNP 2

Matt Cramer · Post by **Matt Cramer** » Mon Aug 03, 2015 6:04 am

I'm wondering if your TPS is on its way out.

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