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Old 02-27-2009, 07:09 PM   #1
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Default Car doesn't start and then after cooled down, starts

So go into store, come back out, car isn't starting.


Turns over, acts like it isn't getting fuel (starts up, gets to about 500rpms and then dies).

I call a tow truck to get it home and right as the tow truck comes, car starts right up and works fine. Car drives fine all the way home. Had my buddy check fuel pressure from the fuel pump and its great.

Heres some thoughts I had... tach signal comes from the coils correct? Well when my car gets really warm (<200 clt) after driving around for a bit, the tach dies. Just doesn't work. This has only happened since turbo'ing the car. Could heat coming off the mani & turbo be cooking something inside? What else would cause this?
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Old 02-28-2009, 04:06 AM   #2
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¿que?
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Old 02-28-2009, 06:07 AM   #3
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Are you running a MS?
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Old 02-28-2009, 10:35 AM   #4
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yeah, put your mods in your sig newb.
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Old 02-28-2009, 11:01 AM   #5
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cranking enrichment is probably incorrect when it's warm.
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Old 02-28-2009, 12:03 PM   #6
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Are you on the stock ecu?!
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Old 02-28-2009, 01:40 PM   #7
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Whoops, megasquirt 94/95


And guess what, the car cranks fine when warm, sometimes. Hence why I am feeling it isn't actual ms cranking settings. I'll attach my msq anyways.
Attached Files
File Type: msq megasquirt200902041523.msq (35.1 KB, 98 views)
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Old 02-28-2009, 02:12 PM   #8
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tune your clt-based air density correction table. under advanced set it for AIT corrections.
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Old 02-28-2009, 07:36 PM   #9
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Quote:
Originally Posted by Braineack View Post
tune your clt-based air density correction table. under advanced set it for AIT corrections.
I dont understand completely, can you expound on this a bit? Namely I can see the settings, but I dont understand what I would modify for what. What settings do you use?
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Old 02-28-2009, 07:45 PM   #10
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My car did the same thing today, I go into a bar, come out drunk. Car doesn't start. I wait about 20 min, car still isn't starting. Tow truck takes me home (free via AAA).

I get home and for ***** and giggles, I try to start. Car starts immediately. I drive it around a bit. Turn it off and it wont turn on again. ******* hell project cars are a headache.

p.s. teach me how to tune my clt based density bit.
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Old 02-28-2009, 07:48 PM   #11
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Coil pack or CAS.

/thread.
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Old 02-28-2009, 08:08 PM   #12
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Pat I think you're wrong on this one.


Your car is heatsoaking and you're not correcting for it. You need to add fuel with your AIT-based air density corrections table (which is completely zeroed out on your msq). do a quick search, this is a heavily covered topic.
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Old 02-28-2009, 08:22 PM   #13
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Quote:
Originally Posted by Braineack View Post
Pat I think you're wrong on this one.


Your car is heatsoaking and you're not correcting for it. You need to add fuel with your AIT-based air density corrections table (which is completely zeroed out on your msq). do a quick search, this is a heavily covered topic.
I didn't even look at his msq. So yeah if he's got some corrections that are wrong, fix em. But if it flat out refuses to fire when hot that's a leaky coil in some form or fashion, be it the coil pack or the CAS. If he had a timing light he could check for spark when this happens. Also could datalog it or just look in megatune to see if he's getting a RPM reading when the event happens.
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Old 02-28-2009, 08:44 PM   #14
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Alright, thanks guys.

This makes sense because weather has been particularly warm. However today, the car was literally refusing to fire at all and this is after the car had sat for quite a while.
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Old 02-28-2009, 09:06 PM   #15
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Quote:
Originally Posted by naarleven View Post
Alright, thanks guys.

This makes sense because weather has been particularly warm. However today, the car was literally refusing to fire at all and this is after the car had sat for quite a while.

Was this after it ran for a while? Where's your AIT sensor and what were your AITs?
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Old 02-28-2009, 09:07 PM   #16
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pm scott your email so he can send you an example MSQ file for to to look at for settings
i would help but i lost all my **** when my HD died
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Old 02-28-2009, 09:11 PM   #17
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or i could just post this:
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Car doesn't start and then after cooled down, starts-clt-air-density.gif  
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Old 02-28-2009, 09:29 PM   #18
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Quote:
Originally Posted by Braineack View Post
Was this after it ran for a while? Where's your AIT sensor and what were your AITs?
This was after the car had been sitting for <2hrs.

IAT is just bellow tb. I didnt have my laptop to take a datalog/look at AITs. I will do this tomorrow so I can check it out.

It just doesn't make sense to me why under the same circumstances it will start sometimes and sometimes not. Literally the same circumstances/coolant temps/ambient temps.

I'll try imputing similar values to yours B.
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Old 02-28-2009, 09:32 PM   #19
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Quote:
Originally Posted by naarleven View Post
This was after the car had been sitting for <2hrs.

IAT is just bellow tb. I didnt have my laptop to take a datalog/look at AITs. I will do this tomorrow so I can check it out.

It just doesn't make sense to me why under the same circumstances it will start sometimes and sometimes not. Literally the same circumstances/coolant temps/ambient temps.

I'll try imputing similar values to yours B.
Tell-tale signs of a leaky coil. They go open when they get hot, usually right after shutdown, and they usually go back to working at some point when they're cooling down. Always works when cold though. Will test fine when cold because the problem only happens when it's hot. Anyways, try brain's settings but if it's still fucked, find out if MS sees RPM when this happens. If it does, coilpack.
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Old 02-28-2009, 10:00 PM   #20
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Quote:
Originally Posted by patsmx5 View Post
Tell-tale signs of a leaky coil. They go open when they get hot, usually right after shutdown, and they usually go back to working at some point when they're cooling down. Always works when cold though. Will test fine when cold because the problem only happens when it's hot. Anyways, try brain's settings but if it's still fucked, find out if MS sees RPM when this happens. If it does, coilpack.
Thanks man.

I need a few classes on DIY vehicle diagnosis. I suck at this.
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