j555pre

I have my car starting fine from cold but once switched off and warm I can't get it going again?

It catches but just dies. I've hopefully attached my MSQ if anyone could point out the glaringly obvious that I must have missed.

Thanks

CRAIGO

Your cranking settings at 160*F ramp right up to 8.0ms compared with your setting at 130*F which is 3.6ms!?

Fix this by trying 2.5ms at 160*F

Also your WUE has a HUGE spike in it at ~130*F adding in 32% more fuel. Try reducing this figure to ~105%.

j555pre

Thanks for that.

I've altered those and will try it again and get back to you.

j555pre

Still no joy. Attached is a pic of a log I took whilst trying to start it.

CRAIGO

What do your plugs look like?

j555pre

Sooty, I cleaned them up before I tried the new settings.

fooger03

iTrader: (2)

Caveat: I have no experience with MS, but from my experience tuning the Hydra:

I get the sense that your warm-up enrichments are way too rich, and that they are overcompensating for your cranking enrichments when the car is cold. When the car is hot, your warm-up enrichments are not there, and although you will have cranking enrichment, it's not enough. Try unplugging your coolant temp sender before a hot start. If you still have it on the front water neck, it should be easy to get to. If this works, then scale back your warm-up enrichments, and increase cranking enrichment.

j555pre

Thanks for the advice. Unhooked the temp sensor but still a no go.

I'll have another look at the settings when its cool and I can get it to run. I'll try and remember to log it running as well.

j555pre

Do you think putting the old tan top injectors back in and see if I can get it starting on these? I just wonder if the 420cc's are leaking and flooding?

Clutching at straws I'll try anything!

j555pre

Well I just had the car running again and it ran well up to 195 F. Then cut out and wouldn't start. The cars temp gauge was just about on half at this point. Is this about right?

Any more ideas anyone? My MSQ is above in the thread and attached below is a log when the motor cut out. Cheers

CRAIGO

It would help to display the AFR on the log to determine what your fuelling was like when it stalled.

j555pre

I'll try and get a log done tonight.

j555pre

Ok, car started fine and ran ok. AFR was fairly constant but fairly rich. Then something happened when warm and the car suddenly goes super lean (18+) and stalls. I'm thinking could this be the IAC valve suddenly opening fully and allowing far too much air in? Or is this the temp at which a setting changes? Really at a loss at the moment. Logs attached running to stall first and then trying to start.

j555pre

So does anyone have any ideas for this? Could it mechanical such as IAC? What if I disconnect it and see what happens? That might be tonights job.

j555pre

Ok. I tried it again tonight but with the IAC valve unplugged. SAme thing happened. No idea what to do next.

N3v

upload your msq now that the car starts hot and i'll take a look at it

heychris

I am having the same issue. How do you have your cranking RPM and cranking spark advance set?

j555pre

Thanks but it still doesn't start when hot. Also after warm up it just flicks from AFR 11ish to 18 super lean dies and won't start again.

I'm wondering if its something in my msq or whether its IAC related as it must be getting a whole bunch of air from somewhere or last night whilst asleep I wondered if my fuel tank could be vacuuming and stopping fuel getting through after the car has run a while.

attached is current msq thanks.

j555pre

So I tried it with the idle valve unplugged which should keep it shut but the car wouldn't start at all. Plugged it back in and it ran. Then cut out when hot and wouldn't run again! Grrrrrrrr!

j555pre

Ok, changed the fuel filter, no difference. Idle valve disconnected still runs then cuts out. Tank is not vacuuming. So I'm thinking fuel pump or FPR any thoughts or other ideas?

Help!