Car starts fine on MS but wont re-start

[JayPSC]

Right the car seems to be running fine on MS (extra code) idles lovely at about 13:1-14:1 but when I shut the car down after a run, or even when it's been sat on the drive idling, it just does not wanna restart & I have to leave it for 10mins or so until it'll start again. Most embarrassing as I found out at the petrol station earlier with a queue of cars behine me lol.

Any idea what could be causing this? I swear it was all fine when I was on the std MS code running. I suppose I could just save my msq & go back to stock code but I want the 12x12 tables. Anyone got any ideas? i thought the engine could just be flooded or something but I removed the fuel pump fuse & turned engine over to clear cylinders but it still doesnt like it.

Cheers
Jay

[linuxman51]

Right the car seems to be running fine on MS (extra code) idles lovely at about 13:1-14:1 but when I shut the car down after a run, or even when it's been sat on the drive idling, it just does not wanna restart & I have to leave it for 10mins or so until it'll start again. Most embarrassing as I found out at the petrol station earlier with a queue of cars behine me lol.

Any idea what could be causing this? I swear it was all fine when I was on the std MS code running. I suppose I could just save my msq & go back to stock code but I want the 12x12 tables. Anyone got any ideas? i thought the engine could just be flooded or something but I removed the fuel pump fuse & turned engine over to clear cylinders but it still doesnt like it.

Cheers
Jay


turn your priming pulse up

[Morley]

Where's your IAT located? And what kind? Brass or open cage?

[JayPSC]

turn your priming pulse up

Priming pulse was set to 2ms, tried at 1ms, 2ms, 4ms, & 8ms. None made a difference. I have noticeed that the pulse width & duty are both stuck at 0 while cranking :???:

IAT is open cage btw

Jay

[kyle242gt]

that 0DC and PW suggests flood clear, make sure your flood clear is raw ADC (get that from calibrate TPS). It might be that your cranking RPM is set too low.

[JayPSC]

AFAIK that is all set up ok, floodclear is set to 4/5 pedal travel & cranking set to 300rpm.

Doesnt show you a great deal but here's log image...

http://www.jaypsc.co.uk/pics/log.jpg

[Hank Scorpio]

you can always put a manual fuel pump kill switch on to make SURE your not flooding the motor.

[JayPSC]

Next time I get it running & shut it down I'll pull the fuse to get the engine to stop & see if I have the same problem.

[JayPSC]

Right, started 1st time again this morning. Ran it for 5 mins, pulled the fuse to stop the engine & it wouldn't start again. Any ideas, this is starting to annoy me lol.

[Matt Dupuis]

Sounds like the rock-crawler portion of the code. Basically, once the engine gets above it's cranking speed, it won't drop back INTO cranking until 1/2 second after MS sees 0 RPM. Early versions of this code feature were closer to 2 seconds delay, and during my personal testing this feature sometimes stuck.

In the MSLVV, it's showing that you've got no injector pulsewidth during cranking. This could be flood clear, but your TPS is at zero and it doesn't look like MS is seeing any RPM during cranking either. What do the gauges say while you're cranking?

WTF is happening to your AFR during cranking? If you're not firing, you should have nothing but oxygen and raw fuel in your cylinders, which will make the AFR dead lean. Yours is showing it to be dead rich during the no-fire moments, which is made even stranger by the fact that you're not pulsing your injectors at all...

Edit - I'd go grab the newest code and reload that. See if it helps. What version are you currently running?

[JayPSC]

Ignore the AFR, it's because the WB is running off the cig lighter so it cuts out during cranking. Seems it's definitly a problem with the extra code as I went back to the V3 code from easytherm & it starts fine everytime.

This is where it gets weird lol, even when the car starts fine on the extra code I see no PW, DC or RPM check the logs:
www.jaypsc.co.uk/pics/MS1.xls this is normal V3 code
www.jaypsc.co.uk/pics/MSextra.xls extra code

Extra code is 024s9 btw.

Also unrelated to this, I'm using non-GM sensors so would I have to alter the extra code via easytherm to get the new sensor curves or does the download.bat I'm using to upload the extra.s19 take care of that??

ps I'm gonna go back to the previous stable 021u3 code & see if that helps

Jay

Edit: Changed to earlier version & seems fine, very bizarre :???:

[linuxman51]

24s9 has revised cranking settings, its likely that some of them for hot start weren't setup right, it took me a little while to figure it all out as well (mine did the same thing)

[kyle242gt]

Why is MAP at 100Kpa the whole time? You didn't by any chance leave the MAP sensor disconnected (not that I've BTDT :oops: )

And did you try to reflash with the 24s9 yet?

[JayPSC]

Why is MAP at 100Kpa the whole time? You didn't by any chance leave the MAP sensor disconnected (not that I've BTDT :oops: )

And did you try to reflash with the 24s9 yet?

MAP was as 100 whole time because it was cranking I imagine, look on the 2 logs I've linked & it looks normal.

Haven't flashed back to 24s9 yet, if this version works fine then I'll leave it.
Cheers
Jay

[The Aspirator]

Map should read less than 100 while cranking, mine's at like 70-80 I think. Kenny mentioned the cranking pulsewidthds, I was having this exact same problem so I messed with my 160* cranking pulsewidth and the problem dissapeared. It used to happen nearly every time I tried to re-start a hot engine, now it hasn't done it in weeks since I fixed it. I'm pretty sure I richened it up.

But the fact that your PW's are at 0 is obviously your problem. Try and figure out what's up with that and let us know!

John