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Old 10-18-2014, 08:04 PM   #1
gbfans66
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Default 1999 SL1 Sedan - chugging when started

My daughter's 1999 Saturn SL 1 sedan wouldn't start one day so we changed the fuel filter and it starts but in the morning when it's first started it chugs and she has to give it some gas to keep it going. Once it's started for the day it seems to run fine but trying to figure out what else it can be so that she's not stranded anywhere in the city. Oh her dad got a code that there was also a problem with the throttle sensor and replaced that. Any thoughts?

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Old 10-18-2014, 09:45 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 1999 SL1 Sedan - chugging when started

Remove the coolant sensor and examine it. An original round nosed plastic one tends to fail and runs the engine rich. The flat nosed brass replacement cures this problem permanently.

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Old 10-18-2014, 10:12 PM   #3
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2001 SL1
Default Re: 1999 SL1 Sedan - chugging when started

Didn't the 98 & 99 have an issue with the fuel filter? IIRC those years have a built-in pressure regulator that the other years don't have....might contribute to a pressure issue if they installed the basic filter.

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Old 10-18-2014, 10:53 PM   #4
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2001 SC2
Default Re: 1999 SL1 Sedan - chugging when started

Quote:
Originally Posted by toggenburg View Post
Those years ('98-'02) have a built-in pressure regulator that earlier years don't have....contribute's to a pressure issue if they installed anything not WIX or OEM (and OEM was reported recently to be reboxed WIX with 20%+ markup)
Fixed

Put a fuel pressure gauge on it to verify 48psi (+/-3psi), sadly AZ and AAP won't let you use it in the parking lot (they got kinda feisty about it too...)

Does sound like the current issue is with the ECTS, had a similar issue (that only came up on below 60f morning/nights) that I finally figured out in 2f temps with it snowing at midnight one night after work...

...
The proper way to fix a S-Series automatic is to replace it with a 5spd O:)

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Old 10-19-2014, 02:06 AM   #5
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Default Re: 1999 SL1 Sedan - chugging when started

Quote:
Originally Posted by toggenburg View Post
Didn't the 98 & 99 have an issue with the fuel filter? IIRC those years have a built-in pressure regulator that the other years don't have....might contribute to a pressure issue if they installed the basic filter.
Well, the opening statement started with "sedan wouldn't start one day so we changed the fuel filter and it starts but..." along with a new member would suggest starting with the coolant sensor. You're correct about the combo fuel filter/regulator and fetchitfido did suggest a pressure check. This covers two possible issues.

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