Thread: Random Misfire

Originally Posted by blinded

Originally Posted by EuroEclipse

like Lee said, 2g 7bolt owners can run the 1g CAS. there are tons of people who found the fix to the problem, but i can't seem to. the invert CAS button on DSMLink is supposed to take care of it. but it didn't.
i've read on NABR, Magnus, RRE, and other places and they all say either do the POT mod which is just a bandaid or get DSMLink because it'll fix that. but they don't list the fix?

It's not the CAS inversion button. You need to "uncheck" the DTC check for misfires. I'm pretty sure it's been covered in the DSMLink forums.

Here's a good example.

If the car is misfiring and running like ass, disabling the diagnostic code isn't going to fix the car. If it's a false code with no symptoms, yes it'll fix the CEL.

No code, chip, or DSMLink can change the firing order so make sure to check that the spark plugs are in the order they're suppsoed to be.

I fliped the plug wires 1-2 with 3-4 he is running the 95 eprom,
those magna cores might be junk.

blinded is right about the POT mod. i was reading on NABR about it the other day. i'm not going to be doing that.

as far as the oil pan goes, i'm going to take the gasket out and put some grey matter in like jonathan suggested. that means i need to change the oil again... :( i just did it 2 days ago...

and as far as my random misfires go, they're just the phantom signals induced by the 1g CAS paired with the 95 EPROM. i can drive with my DSMLink on and when the RM CEL pops up and the car goes into "limp mode" i can clear the code and it runs fine after that.

i'm not a fan of timing belts and putting the 2g sensor back on would require taking it off.

i think i'm going to try some factory wires or even some taylors. i'm going to be working on it tonight to get my slave cylinder replaced.

Originally Posted by blinded

Originally Posted by 98spydert

If the car is misfiring and running like ass, disabling the diagnostic code isn't going to fix the car. If it's a false code with no symptoms, yes it'll fix the CEL.

I don't have a 1G CAS, but it is my understanding that the CEL for "random misfire" related to the 1G CAS on a 2G is precisely what causes the car to run like ass, not the other way around. And "random misfire" isn't related to the inverted cam signal; it is related to using the cam signal for the crank signal.

If EuroEclipse is considering the potentiometer mod, all that does is disable the DTC check for "random misfire." However, that method contains tuning side effects as it locks baro values into a certain range. See Magnus's writeup:

http://www.magnusmotorsports.com/article_1g2g.htm

I don't know if EuroEclipse really has "random misfire" and I don't know much about his car, but if he does have "random misfire" and is considering the potentiometer mod, I thought I would pass along that unchecking the "misfire" checkbox on the DTC screen is how it is done with DSMLink, without the tuning side effects of the potentiometer route.

Edit: Here's an even better example:

http://www.dsmlink.com/forums/showpo...8&postcount=13

That makes a lot more sense. The first post and link made it sound like simply unchecking the check box would fix a REAL ignition problem.