cold start problems

[pane]

G'day

I know have a new problem that i cant seam to fix. Cold start up issues.

I'm using the ford tfi setup running spark only with lpg. Its ms11 v3 2.8 code. When its hot it runs well and the timing is great, got the map nearly perfect.

I cant get it to start when its cold. I know it is timing because if i disconnect the spout plug (which locks the timing on the dizzy to 10 degree's) it starts first crank, qustion is why???

I also had issues with hot starts but seam to get rid of those by changing the next pulse tolerance settings, starts fine when hot.

So what else can i change?? Ive got the cold advance at none (as when the dizzy is locked its at 10 degrees).
What should the skip pulses be???
Also, what about lag factor settings???

Cheers

[Matt Cramer]

You've got the cranking next pulse tolerance set to 150 percent - that means the ignition shouldn't fire at all when cranking! Try changing it to somewhere from 25 to 50 percent.

[pane]

G'day

Ok tried that just now. It made no difference on cold start. I pulled the spout plug apart again and fired within 1 crank . I let it warm up half way, turned off, plugged spout back in and started again. It was a rough start (the engine seamed to shake alot for about 2 seconds) but it started by itself. Let it get up to normal temp and then it seams to start without any problems, is a little rough (not like it starts with the spout disconnected) but not that noticable.

Also when it does start it takes about 5 seconds of cranking before it will fire, is this normal???

Cheers

[grippo]

Your pmask is 1% - it should be about 50% for your setup.

[pane]

G'day

Right i tried that too, ive tried changing everything i can think of and cant seam to get it to work properly. As soon as the car has been running for 5 seconds i turn it off and it starts fine.

What i have noticed now after playing with it everyday for the last week is that it seams to be firing early. What it seams like its doing is compression locking the motor. But when its warm (coolant at say 40plus degrees) it doesn't do it at all.

So currently i haven't got any cold start advance, if there is any advance it makes it worse. So now i'm wondering if i can retard the advance when cranking????

Can it be done??

Cheers

[grippo]

In your msq you have cranking trigger set to "trigger rise". This means that during cranking MS will fire spark the instant it gets a tach pulse, it ignores spark table settings. So this may be your problem. The easiest way to solve it is to set crank trigger to "Calculated" and then adjusting the spark advance table in the lowest rpm bins will affect your cranking. But before you do this be absolutely sure you have checked your timing at idle and at some rpm above idle with a timing light and made sure it matches the ignition advance gauge value.

[pane]

G'day

I have found that i have problems with my dizzy, so i now have a new one and will put it in over the weekend here.

I'll see if that makes a difference to the cold starts, and if it doesn't i may try above.

Cheers