vw 2l 16v V3ms2 stock coil/dizzy ignition miss@part throttle

mxmang · Post by **mxmang** » Fri Jun 30, 2006 7:08 am

My car runs pretty darn well.. 90 jetta with 2L 16v and ms2 v3 board running stock coil and distributor hall effect.

Cold it kind of idles like crap, i think it just needs a bit more advance.

I have my dizzy retarded a bunch and 35 degrees in my trigger offset which seems to work great.

MY BIG PROBLEM :
It gets a bit warm say like just out of WUE or so... and ill be cruising at 2500-2700 rpm part throttle tach is steady, suddenly the tach will start bouncing around a bit and the car will start missing and the engine bucking... if i shift down and rev it up or floor it, its fine. Is there just too much timing down there? Is it changing my dwell and causing a miss?

Should I install a seperate wire for the hall effect with tinfoil and shielding and ground the shielding somewhere? I almost think its just an interference problem at that rpm... unfortunately 2500 is my cruising speed...haha... so id like to get rid of this, its kind of irritating!

Thanks in advance. Let me know if you need more info on the subject.

gtiman82 · Post by **gtiman82** » Wed Jul 05, 2006 7:32 am

Whats up mxmang!

Just a thought....
With the distributor retarded so much what you may have going on is too large of a gap from the rotor to distributor cap point. The rotor does have a 25*?45*? window of oppurtunity for the spark to jump from rotor to cap, but you may be at the outer limits of that window. There should be evidence of this if you pull off the cap.

An old reported HP trick on V8's was to get the rotor and cap point lined up perfectly at upper RPM's. Dont know the effect on a 4 cylinder but I think that goal is a fairly good one and may keep you out of trouble.

Anyways, you may want to try advancing the distrib and resetting your trigger angle until the trigger angle is around 10* instead of 35.

Good luck bro!

mxmang · Post by **mxmang** » Sat Jul 15, 2006 7:45 pm

thanks for all your help through this dude, im almost to the point of taking the megasquirt out for now and putting it on my truck since it is a play toy and not a daily driver... i really love how hte MS worked when i got it going but this is unacceptable... i will try that tomorrow, wish me luck