SL/R129: What's next part Dah !
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 65
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From: Panama city FL
1997 sl500 83 Elcamino 05 Caddie
What's next part Dah !
The cel said misfire on 7 & 8..Ok new plugs and coils coming right up.
2nd test drive... I live In Fla so I give it a real test drive. CEL back on... only now it missing on cyl 8 and the # 2 oxygen censor or short
@this point I get p'oed step on it hard and every light comes on the rpm drops, I let off the gas & everything goes back to normal EXCEPT the CEL is still on.Driving it stutterind at low RPM but made it safely home. Now I am thinking wiring harness
Any suggestions or quick way to find and fix the short ? Please
2nd test drive... I live In Fla so I give it a real test drive. CEL back on... only now it missing on cyl 8 and the # 2 oxygen censor or short
@this point I get p'oed step on it hard and every light comes on the rpm drops, I let off the gas & everything goes back to normal EXCEPT the CEL is still on.Driving it stutterind at low RPM but made it safely home. Now I am thinking wiring harness
Any suggestions or quick way to find and fix the short ? Please
Last edited by lector; Nov 4, 2014 at 08:31 PM.
Member
Joined: Mar 2014
Posts: 76
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From: Chula Vista, California
1992 400E, 1997 SL500, 2009 R350, 1998 SL500 (for sale)
Have you checked yout throttle body? I had those symptoms and found out that the teeth of the throttle control rack inside the TB were broken. I had to replace the TB.
Member
Joined: Mar 2014
Posts: 76
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From: Chula Vista, California
1992 400E, 1997 SL500, 2009 R350, 1998 SL500 (for sale)
When mine went, I could hear a distinct rattling sound coming from it, even when at idle. I didn't need to do anything further.
I guess that you could remove your air filter box, have someone step on the accelerator while the transmission is in park and look to see if the butterfly valve is opening as it should.
Perhaps a member with more expertise than I possess could respond with a more definitive test procedure.
I guess that you could remove your air filter box, have someone step on the accelerator while the transmission is in park and look to see if the butterfly valve is opening as it should.
Perhaps a member with more expertise than I possess could respond with a more definitive test procedure.
Super Member
Joined: Jul 2010
Posts: 598
Likes: 19
From: Eastern Kansas
94 SL 600, 98 993, 89 XJS Conv., 85 Daimlier Princess 16 Hybrid Lincoln 16 Chevy crewcab
I never want to take away the best "catch all" for R 129 owners, but very few of us experienced the wiring harness nightmare and by 96 it was the dirty secret sweep under the "rug"
Many fuel system components may be part of the engine malfunction, and yes almost all are part of the electronic system. The latest round of fuel issues for my 12 cylinder came from the throttle control and E gas module. I went for new parts from Benz, but rebuilds may be a more economical route. They have now been replaced twice during my ownership ( 16 years ) The primary issue may have been a small element in the throttle body that over energized the E Gas module, causing its breakdown.
Hope my path gives you insight into the non harness issues that may be presenting with your engine power and warning light show!
Many fuel system components may be part of the engine malfunction, and yes almost all are part of the electronic system. The latest round of fuel issues for my 12 cylinder came from the throttle control and E gas module. I went for new parts from Benz, but rebuilds may be a more economical route. They have now been replaced twice during my ownership ( 16 years ) The primary issue may have been a small element in the throttle body that over energized the E Gas module, causing its breakdown.
Hope my path gives you insight into the non harness issues that may be presenting with your engine power and warning light show!
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 65
Likes: 0
From: Panama city FL
1997 sl500 83 Elcamino 05 Caddie
When mine went, I could hear a distinct rattling sound coming from it, even when at idle. I didn't need to do anything further.
I guess that you could remove your air filter box, have someone step on the accelerator while the transmission is in park and look to see if the butterfly valve is opening as it should.
Perhaps a member with more expertise than I possess could respond with a more definitive test procedure.
I guess that you could remove your air filter box, have someone step on the accelerator while the transmission is in park and look to see if the butterfly valve is opening as it should.
Perhaps a member with more expertise than I possess could respond with a more definitive test procedure.
Thanks for the responses.
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 65
Likes: 0
From: Panama city FL
1997 sl500 83 Elcamino 05 Caddie
I never want to take away the best "catch all" for R 129 owners, but very few of us experienced the wiring harness nightmare and by 96 it was the dirty secret sweep under the "rug"
Many fuel system components may be part of the engine malfunction, and yes almost all are part of the electronic system. The latest round of fuel issues for my 12 cylinder came from the throttle control and E gas module. I went for new parts from Benz, but rebuilds may be a more economical route. They have now been replaced twice during my ownership ( 16 years ) The primary issue may have been a small element in the throttle body that over energized the E Gas module, causing its breakdown.
Hope my path gives you insight into the non harness issues that may be presenting with your engine power and warning light show!
Many fuel system components may be part of the engine malfunction, and yes almost all are part of the electronic system. The latest round of fuel issues for my 12 cylinder came from the throttle control and E gas module. I went for new parts from Benz, but rebuilds may be a more economical route. They have now been replaced twice during my ownership ( 16 years ) The primary issue may have been a small element in the throttle body that over energized the E Gas module, causing its breakdown.
Hope my path gives you insight into the non harness issues that may be presenting with your engine power and warning light show!
I can't even find a Chilton's for the 97 sl r129.
