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Old 02-08-2020, 04:02 PM   #1
neurotopia
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2005 L-Series 3.0L Sedan
2002 L-Series 2.2L Sedan
Default Car stalls

My 05 L300 had a couple instances of stalling when pulling up to stop lights. It would start right back up. I replaced the battery since the battery was old anyway, and it didn't happen for a month. Today I was pulling into a parking lot and it stalled again. Didn't start right back up but did after a couple minutes of sitting.

Took it to O'Reilly, they tested the electrical and the battery/alternator came back fine. I tried squirting around some starting fluid while it was running and no vacuum leaks. What's next? Idle Air Control Valve? Anything else?

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Old 02-08-2020, 06:22 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Car stalls

If you had vacuum leaks or components allied to emissions you would have codes.

When was the fuel filter last changed? It could be fuel delivery issue?

Can you confirm for the benefit of all responders to your thread what engine do you have? Towards the end of the L series life, it names ALL the 4 pot and 6 pot engined L series L300. Previously the L200 was the 4 pot and the L300 was the V6. For future post, you can update your profile by adding details of your vehicle. That makes it easy for folks to see exactly what you have

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Old 02-08-2020, 11:45 PM   #3
neurotopia
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2005 L-Series 3.0L Sedan
2002 L-Series 2.2L Sedan
Default Re: Car stalls

Quote:
Originally Posted by floridasl22002 View Post
If you had vacuum leaks or components allied to emissions you would have codes.

When was the fuel filter last changed? It could be fuel delivery issue?

Can you confirm for the benefit of all responders to your thread what engine do you have? Towards the end of the L series life, it names ALL the 4 pot and 6 pot engined L series L300. Previously the L200 was the 4 pot and the L300 was the V6. For future post, you can update your profile by adding details of your vehicle. That makes it easy for folks to see exactly what you have
Good point. I'll swap the filter.

The 05's only have the 6 cylinder, I thought? The car is listed in my profile.

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Old 02-09-2020, 02:15 AM   #4
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2000 L-Series 3.0L Sedan
Default Re: Car stalls

Another problem could the crank position sensor. Our Saturn would faint at stop lights and started back up. Then, one day it quit and didn't start again when the CPS went bad. It is very easy to change on the Saturn Engine. I don't believe the code is shown until the sensor actually goes bad. I'm thinking that the code is set only when the car first starts so until it goes bad you won't get the code for CPS.

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Old 02-10-2020, 08:23 AM   #5
ernesto rex
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2000 L-Series 3.0L Sedan
2003 VUE 3.0L
Default Re: Car stalls

Another quick and simple thing to look for is corrosion on both battery cables. My 2000 LS2 had a habit of stalling out back in 2003 when idling or at low speed. (Yes, I've had this car for a very long time).

I discovered that my positive battery cable was starting to corrode under the red protective cover. Removed the cover, cleaned up the corrosion and the problem never came back.

Good luck.

...
2000 LS2

2003 VUE 3.0 FWD

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Old 02-10-2020, 09:30 AM   #6
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2004 L-Series 2.2L Wagon
2004 L-Series 3.0L Wagon
Default Re: Car stalls

Quote:
Originally Posted by neurotopia View Post
The 05's only have the 6 cylinder, I thought? The car is listed in my profile.
^^^^ That is correct. 3.0 V-6 was the only engine available in 05 for the L-Series.

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Old 02-10-2020, 01:23 PM   #7
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2003 L-Series 3.0L Sedan
Default Re: Car stalls

Mileage, maintenance done, parts replaced, throttle cleaned? At 100k miles, spark plugs, timing belt, water pump and fuel filter are recommended for replacement for long term performance.

No idle air control. L300s use a drive by wire system; electric motor to move throttle, electronic pedal and ecm monitoring throttle and pedal position while commanding throttle.

...
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Old 02-10-2020, 07:36 PM   #8
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Default Re: Car stalls

Quote:
Originally Posted by fdryer View Post
Mileage, maintenance done, parts replaced, throttle cleaned? At 100k miles, spark plugs, timing belt, water pump and fuel filter are recommended for replacement for long term performance.

No idle air control. L300s use a drive by wire system; electric motor to move throttle, electronic pedal and ecm monitoring throttle and pedal position while commanding throttle.
That would explain why I can't find an idle air control valve on Rock :P


110k miles, I'm good about maintenance. Had it for one year.

Fuel filter is sitting on the front seat. I hadn't gotten any misfires so I'd left the plugs alone. Timing belt and water pump, now we're getting expensive! Never done a timing belt so dunno if I'd have the time to do it. Throttle looked clean when I went at it this summer, which surprised me since i'd only owned it for 6 months at that point.

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Old 02-10-2020, 09:25 PM   #9
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Default Re: Car stalls

While none of the 100k mile replacement items are contributing to this random idle killing issue, keep them in mind. Stock (platinum) spark plugs are good for 100k miles+ but its prudent to replace them at recommended intervals (100k miles). Mine looked non the worse for wear other than a tanned look - little to no wear on electrodes due to platinum being wear resistant compared to plain plugs. I replaced them because of the number of cycle plugs go thru, including the wide temperature ranges summer and winter creates. Stress on plugs seem to be less and longer lasting with exotic tipped electrodes. The timing belt is a wear item and will last but shouldn't be ignored if you want to avoid catastrophic engine failure neglecting belt replacement. The water pump is buried and behind the timing belt cover and recommended for replacement instead of revisiting a second time if the pump isn't replaced when the timing belt is replaced. Fuel filter is the easiest replacement. Diy timing belt replacement is all labor with several members here describing it with snapshots. Expensive if paying GM or repair shop with costs between $700-$1200. Several hours and either the special timing kit or diy methods used (wire ties, stove bolts, vice grips).

If anything, a fuel pressure check might reveal something. Expect between 39-48 psi when ignition is turned on (fuel pump cycles for 2-3 seconds) without starting the engine. You might have to go over everything.

Normal startup idle varies - 1200 rpm for a cold engine, 650 rpm warm idle.

...
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Old 02-11-2020, 01:01 AM   #10
neurotopia
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2005 L-Series 3.0L Sedan
2002 L-Series 2.2L Sedan
Default Re: Car stalls

Quote:
Originally Posted by fdryer View Post
While none of the 100k mile replacement items are contributing to this random idle killing issue, keep them in mind. Stock (platinum) spark plugs are good for 100k miles+ but its prudent to replace them at recommended intervals (100k miles). Mine looked non the worse for wear other than a tanned look - little to no wear on electrodes due to platinum being wear resistant compared to plain plugs. I replaced them because of the number of cycle plugs go thru, including the wide temperature ranges summer and winter creates. Stress on plugs seem to be less and longer lasting with exotic tipped electrodes. The timing belt is a wear item and will last but shouldn't be ignored if you want to avoid catastrophic engine failure neglecting belt replacement. The water pump is buried and behind the timing belt cover and recommended for replacement instead of revisiting a second time if the pump isn't replaced when the timing belt is replaced. Fuel filter is the easiest replacement. Diy timing belt replacement is all labor with several members here describing it with snapshots. Expensive if paying GM or repair shop with costs between $700-$1200. Several hours and either the special timing kit or diy methods used (wire ties, stove bolts, vice grips).

If anything, a fuel pressure check might reveal something. Expect between 39-48 psi when ignition is turned on (fuel pump cycles for 2-3 seconds) without starting the engine. You might have to go over everything.

Normal startup idle varies - 1200 rpm for a cold engine, 650 rpm warm idle.
Never done a fuel pressure test, I imagine there's a schraeder valve on the fuel line? Is this a gauge I can bum off Advanced O'ReilloZone?

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Old 02-11-2020, 10:16 AM   #11
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Default Re: Car stalls

Yes, fuel test valve on the fuel rail over the engine, black plastic cap covering the test valve. Advance Auto and AutoZone should have free loaners. Similar to tire valves, screw on the fitting and turn on ignition for pressure.

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Old 02-11-2020, 08:56 PM   #12
neurotopia
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Default Re: Car stalls

Quote:
Originally Posted by fdryer View Post
Yes, fuel test valve on the fuel rail over the engine, black plastic cap covering the test valve. Advance Auto and AutoZone should have free loaners. Similar to tire valves, screw on the fitting and turn on ignition for pressure.
Pressure came back at 38 or 39. I'll swap out the fuel filter and hopefully that will be the end of it.

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