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Old 08-11-2009, 10:30 AM   #1
gieser
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1998 SL1
1999 SL2
Dizzy need some help!

Hi, I need some help with a 1999 sl2 auto, it is slow to rev and wont go much past 3500 rpm, hardly any power at all. had several inactive codes most current to oldest are P0404, P0341, P0420, P1404, P0731, and P0300. This problem just happened all of a sudden like you flipped a switch (thats why i think its electrical). So far i have put new plugs and wires, cleaned coil mounting, swaped coils and module with knowen good one, new crank sensor, new ects, removed and inspected EGR valve, cleaned, and reinstalled, then put another known good egr valve on, all connector terminals looked good on those sensors, checked fuel pressure, about 51-52 psi KOEO and 51-52 psi KOER, listened to injectors w/ screwdriver, all sound the same, cranking compression is 200-210psi in all cylinders, oil looks good, coolant looks good, no funny noise when running. cleared codes and none come back but is still running poor. Im running out of ideas where to go, any information would help alot!! Thank you.

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Old 08-11-2009, 10:48 AM   #2
saturncrzy
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Location: sacramento, CA
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1992 SL2
1997 SC2
Default Re: need some help!

remove TB and do a good cleaning. Also the P0420 is catalyst efficiency below threshold (bank 1). R&R O2 sensor. Also what type of spark plugs are you useing. Alos check your alt is it charging the battery correctly? From learning from this website i have found out that if the alt is not charging correctly and keeping the battery charged u will experiance bad shifting since the automatics are ran off of the battery/alternator.

This is what i suggest some other peeps will chime in on this.

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Old 08-11-2009, 11:12 AM   #3
rc1488
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1997 SL2
1995 SC2
Default Re: need some help!

Remove the front o2 sensor, and run the car. See if that helps the car run better. If it does, then a clogged car is the issue.

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Old 08-11-2009, 01:49 PM   #4
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1996 SW2
Default Re: need some help!

Quote:
Originally Posted by rc1488 View Post
If it does, then a clogged [strike]car[/strike] CAT is the issue.
Fixed.

Also, a P0420 could be something as simple as an exhaust leak between the two O2 sensors.

P0341 and P0300 are both ignition related. 341 is for cam position sensor, which our cars don't have (they "gin up" the signal via spark on #4). Fresh spark plugs (NO exotic metals or thin-wire electrodes) and good quality spark plug wires. Clean the contact towers on the coil packs, and the ground contact areas ("straps" on the coil packs and shoulders on the mounting bolt heads). Double-check wiring order and make sure they're routed correctly, not touching each other.

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