# misfireing.. **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [September 28, 2007, 12:13pm UTC](https://forums.speedlife.net/t/misfireing/36107 "2007-09-28T12:13:05Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![intense98rt](https://avatars.discourse-cdn.com/v4/letter/i/77aa72/32.png) [@intense98rt](https://forums.speedlife.net/u/intense98rt)\ **Post date:** [September 28, 2007, 12:13pm UTC](https://forums.speedlife.net/t/misfireing/36107/1 "2007-09-28T12:13:05Z")
I’m having an issue with my car. When I get up to about 2800 rpm I’m getting a misfire or something. It’ll lose power, and if I try and keep my foot on the pedal it’ll backfire. The megasquirt software looks good. It has to be something else. Looking at my data logs, at a couple spots, it will spike. RPM will go from 2800 down to 1300 back to 2800 in a second at the same time coolant temp will jump from 185 up to 210 then back down. Right after that happens and and I let off the gas, spark advance will jump up and so does the afr. I think its some kind of signal noise. I tried cleaning and retightening grounds, added more grounds, added an inline noise filter right before the megasquirt. I bought new spark plugs and wires. None of that helped. Any suggestions on what would help? I need to get this thing working asap. ---
**Author:** ![Toda\_Party](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/toda_party/32/7354_2.png) [@Toda\_Party](https://forums.speedlife.net/u/Toda_Party)\ **Post date:** [September 28, 2007, 12:46pm UTC](https://forums.speedlife.net/t/misfireing/36107/2 "2007-09-28T12:46:32Z")
cannot be solved via internet. someone needs to take a look at your logs and test drive it and go from there. ur right, its probably interference…if not, then bump ign up a few degrees and/or bump fuel down a few notches. ---
**Author:** ![intense98rt](https://avatars.discourse-cdn.com/v4/letter/i/77aa72/32.png) [@intense98rt](https://forums.speedlife.net/u/intense98rt)\ **Post date:** [September 28, 2007, 12:48pm UTC](https://forums.speedlife.net/t/misfireing/36107/3 "2007-09-28T12:48:19Z")
ok… anyone feel like going for a ride? also… logs and msq’s are here [http://www.msextra.com/viewtopic.php?t=26146](http://www.msextra.com/viewtopic.php?t=26146) ---
**Author:** ![intense98rt](https://avatars.discourse-cdn.com/v4/letter/i/77aa72/32.png) [@intense98rt](https://forums.speedlife.net/u/intense98rt)\ **Post date:** [September 29, 2007, 12:57pm UTC](https://forums.speedlife.net/t/misfireing/36107/4 "2007-09-29T12:57:28Z")
I figured it out. I think the vb921 ignition drivers went bad. I have it running spark off the stock pcm now and it works pretty good.