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Old 04-25-2017, 11:12 PM   #1
Rockylee80
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Default Sl2 dies when coming to a stop then when started idles high?

My daughter has a 2001 Saturn SL2 165,000 miles. A couple times a week the car will die when coming to a stop. Then when it's restarted it will idle high maybe 2,500-3,000 rpms. I've replaced the CPS, ECTS, cleaned the intake throttle body, removed and cleaned the EGR valve, removed and cleaned the small tube that bolts onto the exhaust manifold (plugged). I'm stumped, maybe the throttle position sensor?

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Old 04-26-2017, 12:12 AM   #2
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2003 L-Series 3.0L Sedan
Default Re: Sl2 dies when coming to a stop then when started idles high?

You've done most things as a matter of basic maintenance with none of the parts causing this problem (cps, ects and egr valve cleaning). What may be causing high idling is the idle air control valve on the throttle body. The tps is the other electrical part on throttle bodies and most likely not the problem.

The iacv is a slave to the pcm and controls the supplemental air passing thru the iacv. It sets all idle speeds - cold engine startup, warm engine and ac use. The fixed throttle setting of the throttle plate sets a low idle of 500-600 rpm with the bypass air port blocked. The bypass air port allows additional air to raise idle to 750-900 rpm for electronic idle speed control. The iacv uses two stepper motors and if its pintle valve sticks from dirt, exhaust gases, fuel and oil, it can create unusual idle speeds with no rhyme or reason. Either remove it to clean the pintle valve shaft without allowing solvent to seep into the body and try it again or test it. Testing requires a normal idle (800-900 rpm).

If you can test the iacv with a normal idle, remove the air cleaner for access to the throttle body. With engine at normal idle, use a finger to block the little port in front of the throttle plate. The engine should drop down to a low idle, not stall. At this point the pcm detects the low idle and retracts the iacv to allow more air thru the bypass air port you blocked with your finger. Removing your finger should result in an immediate jump in idle as air suddenly flows thru the bypass air port. And immediately after the jump in rpm the pcm detects the higher idle and extends the iacv to return to normal idle rpm. The action of observing the low idle to high then return to normal idle verifies the iacv is retracting and extending from pcm commands as the pcm detects deliberate blocking of the bypass air port.

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Old 04-26-2017, 02:26 PM   #3
Jonasan308
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1999 SC1
Default Re: Sl2 dies when coming to a stop then when started idles high?

Quote:
Originally Posted by fdryer View Post
You've done most things as a matter of basic maintenance with none of the parts causing this problem (cps, ects and egr valve cleaning). What may be causing high idling is the idle air control valve on the throttle body. The tps is the other electrical part on throttle bodies and most likely not the problem.

The iacv is a slave to the pcm and controls the supplemental air passing thru the iacv. It sets all idle speeds - cold engine startup, warm engine and ac use. The fixed throttle setting of the throttle plate sets a low idle of 500-600 rpm with the bypass air port blocked. The bypass air port allows additional air to raise idle to 750-900 rpm for electronic idle speed control. The iacv uses two stepper motors and if its pintle valve sticks from dirt, exhaust gases, fuel and oil, it can create unusual idle speeds with no rhyme or reason. Either remove it to clean the pintle valve shaft without allowing solvent to seep into the body and try it again or test it. Testing requires a normal idle (800-900 rpm).

If you can test the iacv with a normal idle, remove the air cleaner for access to the throttle body. With engine at normal idle, use a finger to block the little port in front of the throttle plate. The engine should drop down to a low idle, not stall. At this point the pcm detects the low idle and retracts the iacv to allow more air thru the bypass air port you blocked with your finger. Removing your finger should result in an immediate jump in idle as air suddenly flows thru the bypass air port. And immediately after the jump in rpm the pcm detects the higher idle and extends the iacv to return to normal idle rpm. The action of observing the low idle to high then return to normal idle verifies the iacv is retracting and extending from pcm commands as the pcm detects deliberate blocking of the bypass air port.
So is the air cleaner the thing that attaches on top of the throttle body and has 2 holes leading into the tb? Or does this test require removing the air intake hose?
If its true that blocking it off shouldnt cause a complete stall, i may have a problem. If i put my finger over those holes, my engine will shut off.

...
1999 Saturn SL1-129k at purchase(may 2016)-139k when wrecked(September 2016)

1999 Saturn SC1(CURSED)-156K at purchase(october 2016)-187k currently (August 2018)
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Old 04-26-2017, 06:47 PM   #4
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Default Re: Sl2 dies when coming to a stop then when started idles high?


Looks like this?

...
1999 Saturn SL1-129k at purchase(may 2016)-139k when wrecked(September 2016)

1999 Saturn SC1(CURSED)-156K at purchase(october 2016)-187k currently (August 2018)
Dodging potholes should be a sport

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Old 04-27-2017, 06:58 AM   #5
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Default Re: Sl2 dies when coming to a stop then when started idles high?

Quote:
Originally Posted by Rockylee80 View Post
My daughter has a 2001 Saturn SL2 165,000 miles. A couple times a week the car will die when coming to a stop. Then when it's restarted it will idle high maybe 2,500-3,000 rpms. I've replaced the CPS, ECTS, cleaned the intake throttle body, removed and cleaned the EGR valve, removed and cleaned the small tube that bolts onto the exhaust manifold (plugged). I'm stumped, maybe the throttle position sensor?
Sometimes a vacuum leak at the intake manifold gaskets can cause erratic idle. If it idles rough in your driveway, you can try spritzing a water spray at the intake manifold where it connects to the head area. If you notice a change in engine speed, you identified a vacuum leak.

I have done this with brake cleaner (easier) instead of water, but be cautious if you try it.

...
John.... 2006 Saturn Vue, 2.2, 186,000 miles Recently junked out - (threw a rod)

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Old 04-27-2017, 10:27 AM   #6
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2003 L-Series 3.0L Sedan
Default Re: Sl2 dies when coming to a stop then when started idles high?

Quote:
Originally Posted by Jonasan308 View Post
So is the air cleaner the thing that attaches on top of the throttle body and has 2 holes leading into the tb? Or does this test require removing the air intake hose?
If its true that blocking it off shouldnt cause a complete stall, i may have a problem. If i put my finger over those holes, my engine will shut off.
Your picture is showing the vacuum ports of the throttle body, not the bypass air port inside the throttle bore in front of the throttle plate. The first picture in this link shows the bypass port and descriptions; http://mopedalife.tumblr.com/post/20...-body-clean-up

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Old 04-27-2017, 11:49 AM   #7
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Default Re: Sl2 dies when coming to a stop then when started idles high?

1+ on posting that link.

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