Acceleration Faltering, Details 2nd page Options

[Tigawoods]

lets cut to the chase.

-car ran fine after cam install

-small valve tap

-after 2 weeks small knocking noise that seems to be coming from below the cam gear and only sounds when its around 1000rpm

-had an exhaust problem - detached the midpipe to run open downpipe until i got it fixed

-car ran super lean at low rpms under a fair load and sputtered as if its grasping to find power. sputters from stop to go at low rpms and drops super lean

-new mid pipe welded on

-car still sputters from stop to go at low rpms but now it gets a bit rich or just sputters with an even 14.X A/F r

- AND at 4900rpm under 100% throttle the car falls on its face and looses power. if anything under 100% throttle there is no problem.



i have a race this sat. and sun. i really need to figure out if this is a tune problem or an internal problem.
any insight at all will be helpful! thanks!

This post has been edited by Tigawoods: Jan 23, 2011 - 11:58 AM

[Tigawoods]

Did you clear out the negative SAFC settings I put in for you?

Since installing those cams, you are going to need to add fuel in the upper rpm range.

it gets super rich in the higher rpms so we had to add more air. still needed neg correction

Sounds like some of the symptoms of a bad throttle position sensor, but could also have to do with the tune.

I've seen cars with a bad TPS that have the same full-throttle type issues; sensor goes bad and doesn't read the right value when XX% open and car mis-adjusts fuel. Can cause the car to run like crap all kinds of different ways.

that does sound like it could be the problem. ill give it a look see. thanks for posting! keep it coming!