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#1 | ||||
New Member
![]() Join Date: Jun 2018
Posts: 5
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![]() First post here, and I'm at a total loss. I've read the posts on this from years ago but I think I still may have missed something.
The RPM's will surge between 800 and 1300 while idling and driving. It's an 99 SL2 DOHC auto. I've already replaced Valve Cover gasket, PCV Valve, ECTS, IAC, cleaned the MAP sensor and EGR valve. After cleaning the EGR valve the problem wasn't as noticeable but still there especially once the car warms up. Any help is appreciated guys.
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#2 | ||||
New Member
![]() Join Date: Jun 2018
Posts: 5
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![]() Sorry, couldn't find the edit button on mobile. I also replaced the spark plugs with ac Delco and the ects with a duralast brass one. The connector to the ects is corroded (probably from the original ects) but I can't find anywhere online to order one. Thanks for the help guys.
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#3 | ||||
Junior Member
![]() Join Date: Jul 2009
Location: Canada
Posts: 20
1999 SC1
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![]() The EGR valve may need to be replaced altogether.
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#4 | ||||
Master Member
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Join Date: Apr 2010
Location: Beautiful Blue Ridge Mountains of Bedford, Virginia. Born once? Die twice. ------ Born twice? Die once.
Posts: 2,895
2001 SL1
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![]() You need to replace that corroded ECTS connector.
Last time I went to a computer repair shop, for a dollar, they sold me a similar 2-pin plug from a computer PC chassis. I stripped off the jacket insulation, soldered the copper ends together, and finished it off with a (previously applied) shrink tube. Never failed after that.
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#5 | ||||
Super Member
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![]() The egr valve may not be the problem because it regulates exhaust gases fed into the intake air system and would drop rpm at idle or while accelerating resulting in hesitation problems. The egr valve doesn't cause surging, raising rpm.
The corroded coolant sensor connector may be the problem. The sensor works on less than 5 volts so any corrosion means resistance to alter signal output to the pcm. Either visit a junk yard and search for Saturn intake air temperature sensor connectors and cut one for reuse or buy a two pin pc connector that fits the spacing in the coolant sensor. Most two pin pc connectors like fan cooling connections are the ones to look for. Splicing into and soldering with shrink tubing seals the solder connections. Silicone sealant to seal the push on connections. Just enough silicone smeared to cover the plastic, wiring and coolant sensor. This can be undone later if necessary since silicone is rubbery and didn't work it's way into the male/female terminals.
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#6 | ||||
Master Member
![]() ![]() ![]() ![]() Join Date: Aug 2016
Location: Leavittsburg, OH
Posts: 3,168
1995 SC2
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![]() As previously stated, you will want to fix the corroded ECTS pigtail harness, before additional troubleshooting.
Grab a pair of side cutters and head to a local wrecking yard for cutting the harness section off a dead Saturn S-Series. 1991-2002 all use the same plug and sensor. Butt connectors and wire caps are NOT the recommended repair here. Solder the ends of the wires together before sealing them with electrical tape or some form of insulator. ... "What does a Saturn owner do, at the gas station?" "He checks the gas, and fills the oil....."
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#7 | |||||
Member
![]() ![]() ![]() Join Date: Mar 2007
Location: Cincinnati, OH
Posts: 248
1999 SL2
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![]() Quote:
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#8 | ||||
New Member
![]() Join Date: Jun 2018
Posts: 5
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![]() I found one through autozone (3 minutes from my house) for $9 and it will be here tomorrow. I think it's a Doorman. Hopefully this fixes it. Now I just gotta get rid of the slam when going into reverse.
I tried Wolf's fix, new fluid and spin on filter, run it in reverse for 30 minutes. Didn't fix it.
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#9 | ||||
Super Member
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![]() ^ Are you describing a coolant sensor or two wire sensor connector?
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#10 | ||||
Senior Member
![]() ![]() Join Date: Oct 2008
Posts: 1,434
2000 SL2
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![]() Dorman 645-900
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#11 | ||||
Senior Member
![]() ![]() ![]() Join Date: Oct 2016
Location: Poplar Grove, IL
Posts: 1,408
1999 SL2
1998 SC2
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![]() ... Bryan Cotton '99 SL2, 5SP bought new Rebuilt at 204,067 September 2017 Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on! '98 SC2, 5SP bought 2018
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#12 | ||||
Master Member
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Join Date: Apr 2010
Location: Beautiful Blue Ridge Mountains of Bedford, Virginia. Born once? Die twice. ------ Born twice? Die once.
Posts: 2,895
2001 SL1
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![]() The computer part I described above works just as good, and is cheaper and no shipping charges.
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#13 | |||||
Master Member
![]() ![]() ![]() ![]() Join Date: Aug 2016
Location: Leavittsburg, OH
Posts: 3,168
1995 SC2
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![]() Quote:
My Valve Body has just under 33,000 miles on it, currently, and just got a fresh filter, cleaned magnet, and new fluid with Lucas additive. Shifts so smooth you can't even feel it shift in "Performance" mode. And this VB has seen multiple trips to the drag strip. ... "What does a Saturn owner do, at the gas station?" "He checks the gas, and fills the oil....."
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#14 | ||||
New Member
![]() Join Date: Jun 2018
Posts: 5
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![]() The connector
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#15 | ||||
Super Member
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![]() Ok, let's hope the new connector eliminates this surging problem. I checked a member's link to rockauto for the connector.
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#16 | ||||
New Member
![]() Join Date: Jun 2018
Posts: 5
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![]() Ordered the l ects connector from Rockauto (part number 1P1439) and installed it and let it idle to operating temp. After about 15 minutes there wasn't a single fluctuation in the idle at 800 rpm. I went for a quick drive around the block and floored it at one point and it idle at 800 and ran smooth the whole time. Temp sat right at 3/8 the whole drive and never went over 1/2 while idling.
Next question, I'm replacing the intake manifold gasket and cleaning the intake. I also want to replace the fuel filter and was thinking of going with a Premium Guard PF5501 from rockauto for $22.79. Any thoughts or recommendations?
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#17 | |||||
Master Member
![]() ![]() ![]() ![]() Join Date: Aug 2016
Location: Leavittsburg, OH
Posts: 3,168
1995 SC2
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![]() Quote:
... "What does a Saturn owner do, at the gas station?" "He checks the gas, and fills the oil....."
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#18 | ||||
Senior Member
![]() ![]() ![]() Join Date: Oct 2016
Location: Poplar Grove, IL
Posts: 1,408
1999 SL2
1998 SC2
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![]() My research on SaturnFans led me to the Wix 33731 for my '99 SL2. We snapped the bolts for the bracket and had to drill and tap.
One of the many threads: http://www.saturnfans.com/forums/sho...d.php?t=186901 Mine after replacement: ... Bryan Cotton '99 SL2, 5SP bought new Rebuilt at 204,067 September 2017 Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on! '98 SC2, 5SP bought 2018
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