CAS Adjustment

[MixxyMatosis]

So after changing my CAS O ring yesterday I've had a little trouble with power delivery. Upon re-fitting the CAS I found that the mark I had made (on the rocker cover side) had disappeared and thus had nowhere to line it up to. So I set it up with the engine running. All the way up = Slow and laggy spool up and all the way down = fast spool up, pressumably with no guts behind it. So I stuck it somewhere in the middle, went for a drive and it all just felt wrong, big flat spot about 4k. Ever since then I've been pulling over and trying a little bit more one way or the other but I just cant seem to find that "sweet spot" it was in before. Is there any way I can get this right again or will Mixxy never be the same again?

[MX-5 Lazza]

Stop driving it around like that! Get the timing sorted asap! If you run it too advanced you can destroy your engine!
All it needs is someone with a timing strobe light - a 5 minute job.

[snotrag]

Yup, I'd hold fire if I were you.

The rotation of the CAS is what determines the amount of timing advance the engine runs.

Its a very small adjustment between way too much and way too little.

Easy to adjust with a timing strobe but I wouldnt suggest driving it with it jsut set any old how is much good for your engine, engine damage.

Edited by snotrag on Tuesday 13th July 15:45

[MixxyMatosis]

Cheers you two. You may very well have stopped me from making a fatal mistake. I'll get hold of a timing strobe tomorrow and she'll be running perfect as before.

[MX-5 Lazza]

Remember you need to put a jumper between TEN & Gnd in the diagnostics box before you set the timing. You should take that opportunity to set the idle correctly too

[DennisTheMenace]

What lazza said , you need to bridge ten and gnd in the diagnostic box before setting the timing.

[bluetone]

MX-5 Lazza said:

Remember you need to put a jumper between TEN & Gnd in the diagnostics box before you set the timing. You should take that opportunity to set the idle correctly too

Out of interest; does this prevent the ECU from adjusting the timing?

[MX-5 Lazza]

Not completely but it does enough for the purposes of adjusting the base timing & base idle.