I've been running my MS3+FM combo for the last few months without many hiccups. Today, I used the car to grab groceries and returned it back to its parking spot fine. A few hours later, I go to start the car, it catches like normal then suddenly dies. When it cranks, it just cranks.. No catching whatsoever. I played with the cranking pulse to no avail -- it's been working on the current map at the same temperatures for a while now, so that shouldn't be the problem. I recorded a log for the pros on this board to look over. It looks like its getting fuel, not sure why it won't start... Any clues? Thanks in advanced.. I need to move the car ASAP.

I'm using FAB9 COPs. I haven't done a spark check yet, but the COPs are basically brand new..

 

If it worked and stopped working its probably not the tune. We need a composite cranking log.

Also what year car. What year motor. What trigger setup.

 

The MSQ doesn't pull that? How do I record a composite cranking log?

 

My car recently ran semi decent, last week bish won't start. I tested coils to be bad. You're running cops though...I'd check for spark.

 

Also check the fuel pump. Just hearing the relay click isn't enough. Typical symptom is car starting then stalling a couple of seconds later (many seconds later on returnless), out of the blue.

 

Pulled the spark plugs and cranked the car. They were super dirty cause I've been running pretty rich (Iridium IK-22). Cleaned them off and watched them spark. Plugged them back in and couldn't get the motor to turn. So I recorded video of both the dirty sparks and brand new plugs. The spark patterns were coming off differently so I decided to replace the whole set. Once I got the new plugs in, the car runs 100x smoother than it was before. I guess I was misinterpreting the cars stumbly idle as a poor tune as opposed to gunked plugs.

I've gotten maybe 5k out of each set of 4 IK22s. The car warms up around 11-12 AFR then idles around 14.3-5.

I've since changed the warmup to be closer to 13 on cold and 14.7-.9 on cruise. Hope this extends the length of these plugs.

I've got video of the two spark patterns if that would help people... Let me know!

Thanks for the response again!

 

This happens to more people (including myself) than it should. We make assumptions that problems are MS related, when it was something mechanically the whole time.