Nissan ka24det misfiring under a load

nissanka24 · Post by **nissanka24** » Tue Mar 22, 2011 5:27 pm

I have ms2 ver 3.57 with the vb591 i think thats what its called installed on my turbocharged ka24de and out of the blue it started missing under any type of load in or out of boost.I have checked and or changed the following; cap, rotor, dizzy, wires, plugs and my msd6al plus i have checked all my wiring it does idle just fine.I have had it running on my ka for about three years no problems and then it started to misfire i dont know what else to look at any ideas would be much appreciated

Matt Cramer · Post by **Matt Cramer** » Wed Mar 23, 2011 4:45 am

Please check what sort of ignition output transistor you have in Q16 - is it a VB921 (specifically marked "VB921") or a BIP373 (has a metal tab, a Bosch logo, and some completely indecipherable numbers)?

nissanka24 · Post by **nissanka24** » Wed Mar 23, 2011 10:22 am

Its the vb921 its a box that DIYAutoTune built for me i did not assemble it i bought it as a assembled kit with the 4 bar map sensor.

Matt Cramer · Post by **Matt Cramer** » Wed Mar 23, 2011 10:35 am

The VB921s are easily damaged, and sometimes a damaged one may reduce spark output but still fire. I'd consider upgrading to a BIP373; they're a lot tougher.

nissanka24 · Post by **nissanka24** » Wed Mar 23, 2011 12:16 pm

You have three listed on your site which one should i order?

Matt Cramer · Post by **Matt Cramer** » Thu Mar 24, 2011 4:48 am

Get the MK-BIP373.

nissanka24 · Post by **nissanka24** » Thu Mar 31, 2011 9:38 am

So basically after reading everything i have the assembled ms2 ver 3.57 with the vb921 all i need to do is de-solder q16 and then solder in the bip373 and not use the resistor?

Matt Cramer · Post by **Matt Cramer** » Thu Mar 31, 2011 10:03 am

That is correct.

nissanka24 · Post by **nissanka24** » Sat May 07, 2011 1:52 pm

That didnt help at all

Matt Cramer · Post by **Matt Cramer** » Mon May 09, 2011 4:36 am

In that case, I'll need more information. Could you post a copy of your MSQ file and a data log of it misfiring under load?

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Nissan ka24det misfiring under a load

Nissan ka24det misfiring under a load

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Re: Nissan ka24det misfiring under a load

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