SaturnFans.com
saturnfans.com - classifieds - forums


Go Back   SaturnFans.com Forums > Models > Saturn S-Series > S-Series Tech

Reply
 
Thread Tools Display Modes
Old 09-23-2022, 10:10 PM   #1
sd_98saturnsl2
Junior Member
sd_98saturnsl2 is on a distinguished road
 
Join Date: Sep 2010
Posts: 14
Default 1998 SL2 Extremely Sluggish Acceleration

Hi,

I have a 5 speed manual 1998 Saturn SL2 with about 210k miles. Recently it's acceleration has been extremely sluggish, especially when going uphill. On flat ground it can eventually get up to freeway speeds. It happens in all gears and maybe a little worse when cold, but occurs when the engine is cold or warmed up.

Based on other thread searches, I have tried the following with no significant improvement.

* Replaced the front O2 sensor and ECTS
* Removed, cleaned the EGR, and reinstalled
* Temporarily removed front O2 sensor. Car continued to idle normally and still had sluggish acceleration. I read in another thread that if this fixed the acceleration issue then it would have likely been a clogged catalytic converter. But, the acceleration issue remained for my car.
* Temporarily disconnected electrical connection to EGR. Car continued to idle normally and still had the same sluggish acceleration. I read in another thread that if the acceleration issue changed without the electrical connection, then the EGR may be bad. It didn't change for my car.

Additionally, the car had been idling high (~2000rpm) for a while until I removed and cleaned the throttle control valve about a month ago, prior to the extremely sluggish acceleration issue. The car now idles around 900rpm after warmed up, maybe around 1100rpm when cold.

Any more ideas of things to try to diagnose the issue? Or what else could be the cause?

Thanks.
sd_98saturnsl2 is offline   Reply With Quote
SaturnFans.com Sponsored Links
Old 09-23-2022, 11:10 PM   #2
billr
Master Member
billr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to behold
 
Join Date: Jul 2013
Posts: 6,885
Default Re: 1998 SL2 Extremely Sluggish Acceleration

Take compression readings and check fuel pressure with a gauge.

Block off the EGR ports. Disconnecting the electric cable is not a definitive test. If disconnecting the cable does improve the engine power, then it shows the problem is probably EGR related; that is true. However, if disconnecting the cable does not change things, the EGR system may still be bad. You have not proven it is good, only that is not definitely bad, and is still suspect.

Likewise, that driving with the front O2 sensor removed is kind of iffy for proving this isn't a clogged cat/exhaust issue. Removing that O2 sensor provides a new exhaust path of only about 3/4" diameter, still not much for even a small engine like this. Removing the down-pipe and cat would be a more sure test, but quite a bit harder to do than just removing the O2 sensor. That said, R&R of the pipe and cat could be done in about 1 hour, if things go OK. It is not an unreasonable thing to try, if other easier stuff gives no joy.
billr is offline   Reply With Quote
Old 09-23-2022, 11:45 PM   #3
sd_98saturnsl2
Junior Member
sd_98saturnsl2 is on a distinguished road
 
Join Date: Sep 2010
Posts: 14
Default Re: 1998 SL2 Extremely Sluggish Acceleration

I'm not an experienced mechanic and I don't have access to a gauge for fuel pressure measurements or exhaust R&R.

For reference, right after cleaning the throttle body valve about a month ago, the car passed a smog test.

When you say block the EGR ports, do you mean remove the EGR and cover the ports with some electrical tape or something? Then drive the car to see if the sluggish acceleration remains to eliminate a bad EGR as a possible culprit?

Thanks.
sd_98saturnsl2 is offline   Reply With Quote
Old 09-24-2022, 12:55 AM   #4
Greg1
Senior Member
Greg1 will become famous soon enough
 
Greg1's Avatar
 
Join Date: Jul 2001
Location: Thousand Oaks, CA
Posts: 1,380
 

1997 SW2
1998 SL2
Default Re: 1998 SL2 Extremely Sluggish Acceleration

You would need to use a piece of sheet metal to cover the EGR port. A soup can makes a good donor.
...
97 SW2 5-Sp 372k
Greg1 is offline   Reply With Quote
Old 09-24-2022, 01:00 PM   #5
billr
Master Member
billr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to beholdbillr is a splendid one to behold
 
Join Date: Jul 2013
Posts: 6,885
Default Re: 1998 SL2 Extremely Sluggish Acceleration

"Soup can" means you need to use a steel can, not an aluminum beverage can.
billr is offline   Reply With Quote
Old 09-26-2022, 12:26 PM   #6
sd_98saturnsl2
Junior Member
sd_98saturnsl2 is on a distinguished road
 
Join Date: Sep 2010
Posts: 14
Default Re: 1998 SL2 Extremely Sluggish Acceleration

Ok, I'll take off the EGR valve again and put a piece of metal covering the ports and reattach the EGR valve to clamp down on the metal. How should I expect the car to run when I do this? Especially compared to the current extremely sluggish acceleration. Basically, what am I expecting and what would indicate a bad EGR?

Any other ideas of what it could be?
sd_98saturnsl2 is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Slow/Sluggish acceleration Max Somerville Vue General 14 04-23-2019 09:32 PM
extremely sluggish in gear but idles and revs in neutral Outlaw3 S-Series Tech 15 05-09-2018 10:21 PM
Very sluggish acceleration Skybear S-Series Tech 10 09-17-2012 12:36 AM
Sluggish Acceleration oasisnutt S-Series Tech 6 09-23-2009 08:44 PM
93 SL1 hesitation / sluggish acceleration 93sl1 S-Series Tech 1 07-06-2001 01:42 AM


All times are GMT -4. The time now is 06:16 PM.

Advanced Forum Search | Advanced Photo Search


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
SaturnFans.com. The Saturn Enthusiasts Site.