| Go back to previous topic | | Forum name | Performance/Engine | | Topic subject | New Cat-back and Cat converter, now I get high rpm miss-firing. | | Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i5&topic_id=59106 |
59106, New Cat-back and Cat converter, now I get high rpm miss-firing.
Posted by Drewcool2, Sep-12-03 03:14 PM
Just installed my thermal research cat-back, and catco high flow cat converter. Overall I got some nice gains over stock. But now I have a problem. When I floor it accelerating above 5K RPMs, I get mild spitting, and miss-firing. I never noticed this problem until I put my exhaust on. I don't know if its a coincidence...
But I hooked up my logger, just to see how my ignition timing is all over the place. Also, it doesn't appear to be running too lean. My O2 sensor readings stay around .8800-.9300V. (Or is that bad?)
What causes my ignition timing to change so much? Even at idle, looking at a graph, my ignition timing is jumpy. I'm assuming this is related to my high rpm miss-firing.
I have new msd coil pack, wires, and NGK plugs.
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59145, RE: New Cat-back and Cat converter, now I get high rpm miss-firing.
Posted by Drewcool2, Sep-13-03 09:55 AM
Anyone know what causes my ignition timing to be jumpy, and un-smooth?
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59147, RE: New Cat-back and Cat converter, now I get high rpm miss-firing.
Posted by Twiste, Sep-13-03 10:24 AM
try reseting your ECU one time...mine doesnt do it...
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59207, RE: New Cat-back and Cat converter, now I get high rpm miss-firing.
Posted by JWoodley, Sep-14-03 12:01 PM
umm, NGK's come pregapped, but im sure you checked them before u put em in, riiiight? could be your problem. :thumbsup goodluck.
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