Who has the random misfire problem?
 

Whos got it? I have an idea that should fix it.

Re: Who has the random misfire problem?
 

you mean me? Although mine's just fuel problems heh, hoping a good fuel regulator and a tune will fix it

Re: Who has the random misfire problem?
 

I got it! I just swaped a 6bolt in and it sucks. whats your idea?
Mike

Re: Who has the random misfire problem?
 

You didn't have the misfire code when I checked last.

Re: Who has the random misfire problem?
 

I don't think I do, right now I'm throwing CEL due to all my EGR stuff missing.

Re: Who has the random misfire problem?
 

Smooth out the crank angle pulses.Like average them out over say 4 pulses.The pulse edges will still be the same, so injectors and timing will trigger as its supposed too, but the ECU won't think there is RPM fluctuations anymore.I'm about 99% sure it will work.

Re: Who has the random misfire problem?
 

WTF? :rolleyes:

Re: Who has the random misfire problem?
 

I have RM if I unselect the check in DSMLink.

Jim

Re: Who has the random misfire problem?
 

The ECU times the crank angle pulsewidths for RM checking.If the times change drastically, from pulse to pulse, the misfire code gets set.The injection and ignition get triggered on the falling edge of the pulse(when it goes from on to off).I'm not sure what the actual threshold is, but for example, lets say one pulse is 50 mS, and the next is 40 mS.Since normal accel/deccel can't change that quickly, the ECU interprets that as misfire.Now if you were to smooth out the pulses, like not let them change more than 2-3 mS per pulse/per 4 pulses, by extending the beginning of the pulse so the falling edge stays where its supposed to be, misfire code would be gone and nothing else would be effected.

Re: Who has the random misfire problem?
 

For the fixing part.I have these tiny self contained data loggers that I built a few years ago.First, I log CA signal fluctuation on a vehicle where the CA sensor is on the crank(my 2g).Second I log CA signal fluctuation on a vehicle where the CA sensor is cam mounted(1g or 2g w/1g motor).From the 2, I can figure out the threshold.After that, the actual smoothing part is real easy, I've thought up about 5 ways to do it, most cheap and reliable.

Re: Who has the random misfire problem?
 

How do you do it?

Re: Who has the random misfire problem?
 

If its simple and you dont have to do much and its cheap. I am down. What does my car need for this to be done? just the code? Do I need datalogger or anything?
Mike

Re: Who has the random misfire problem?
 

I know what causes the code to set, I never heard of smoothing the cas signal.:cool:

Re: Who has the random misfire problem?
 

Probably because no one has ever thought of it.

Scratch that anyway, I figured out a much better way of taking care of the problem, and EGR/O2/Evap codes too.Details when I know if it works.

Re: Who has the random misfire problem?
 

How long you thinking? cuz that would be sweet. My car would be perfect if it didnt have the Random misfire and O2 codes. Let me/us know asap.