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Old 05-08-2021, 12:15 PM   #1
ampecsu
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Default Just died 5 times at stop lights...

...in the span of an hour of driving. Started again after a few minutes and each time after and before it ran like nothing was wrong.

what could the problem possibly be?

I dont know what got it back running, just time? or me messing with the spark plug wires on the coils.

like I said when it starts and runs its like there are no issues at all. Afraid to drive again for fear of getting stuck in the middle of traffic again.

1995 Saturn Sl2 233k manual. (i know...time to get rid of it)
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Old 05-08-2021, 12:27 PM   #2
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Default Re: Just died 5 times at stop lights...

Is it dying while coming up to the stop light, or after idling at the stop light?

If it's while idling at the light:
Without doing any testing at all...I'd blame the crankshaft position sensor. Even after doing testing you're likely to need to replace it anyway, but then you'd be more sure of the money/time spent on it.

Try to get someone else to ride with you, or let it run/idle in the driveway until it dies with someone else around. Need them to turn the key to "start" while you have 2 adjacent spark plug wires pulled off the coil towers so you can check for spark.

If coming up to the light:
I'd blame a dirty throttle body and/or sticky IACV. Simple fix is to buy another throttle body gasket and some O2 sensor safe carb cleaner, take the throttle body off (being careful of the fragile vacuum lines on top of it), remove the IACV and hose down the TB including with the valve/flap opened so you can get that cleaned up too. Don't spray the IACV and be careful not to move the plunger location, moving it won't break it but will make restarting harder than necessary.
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Old 05-08-2021, 05:12 PM   #3
ampecsu
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Default Re: Just died 5 times at stop lights...

Thank for replying. I will look at that.

It didnt die every single time but when it did it would be mere moments after coming to a complete stop.

I think I even have some crankshaft sensors laying around from the junkyard after throwing parts at some issue I was having in the past!

Last edited by ampecsu; 05-08-2021 at 05:17 PM. Reason: more info
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Old 05-08-2021, 06:33 PM   #4
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Default Re: Just died 5 times at stop lights...

Quote:
Originally Posted by fetchitfido View Post

Try to get someone else to ride with you, or let it run/idle in the driveway until it dies with someone else around. Need them to turn the key to "start" while you have 2 adjacent spark plug wires pulled off the coil towers so you can check for spark.
It wont start as of now but It does have spark
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Old 05-08-2021, 07:38 PM   #5
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Default Re: Just died 5 times at stop lights...

Check fuel pressure, TPS, and for injector pulses. A voltmeter can do the latter two, but for FP you will have to buy/rent/borrow a gauge. Your nearest FLAPS may loan those out for free.
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Old 05-08-2021, 08:06 PM   #6
ampecsu
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Default Re: Just died 5 times at stop lights...

Like I said, I had spark but I replaced the crankshaft sensor with my spare laying around and it started up. Does that sound right?
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Old 05-08-2021, 10:16 PM   #7
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Default Re: Just died 5 times at stop lights...

Just curious, did you recently fill the gas tank from a different gas station than usual?
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Old 05-08-2021, 11:40 PM   #8
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Default Re: Just died 5 times at stop lights...

Quote:
Originally Posted by billr View Post
Check fuel pressure, TPS, and for injector pulses. A voltmeter can do the latter two, but for FP you will have to buy/rent/borrow a gauge. Your nearest FLAPS may loan those out for free.
sorry Bill did see your post up when I last posted.
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