500E MISFIRES AT HIGH REV
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 35
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From: Philippines
1992 500E, 2000 E55, 1993 964 RSR, 1973 911 RSR Replica, 1959 Lotus Cortina Ogle
500E MISFIRES AT HIGH REV
I have a 1992 500E which does not get much road use now just so I can preserve its low mileage which is at 52K kilometers. My problem is that lately, when I take the car out, it will misfire at high revs (4,000 RPM and above) in 3rd or 4th gear. Could it be the fuel pump or is it the ignition system?
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1992 Mercedes-Benz 500E
I bet its the OPS or whatever. The brass plug on the side of the transmission that helps the transmission shift at WOT. I know it sounds weird but I am 90% sure thats what it is. You can check the codes and it will show up. I had this problem on my 500E.
The surging comes from improper communication between the EZL and the trans, the trans doesn't know where the engine is, and it wants to retard timing right before the shift so its like guessing. Its like a 20$ part, just takes like a 35mm wrench or socket.
The surging comes from improper communication between the EZL and the trans, the trans doesn't know where the engine is, and it wants to retard timing right before the shift so its like guessing. Its like a 20$ part, just takes like a 35mm wrench or socket.
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 35
Likes: 1
From: Philippines
1992 500E, 2000 E55, 1993 964 RSR, 1973 911 RSR Replica, 1959 Lotus Cortina Ogle
I bet its the OPS or whatever. The brass plug on the side of the transmission that helps the transmission shift at WOT. I know it sounds weird but I am 90% sure thats what it is. You can check the codes and it will show up. I had this problem on my 500E.
The surging comes from improper communication between the EZL and the trans, the trans doesn't know where the engine is, and it wants to retard timing right before the shift so its like guessing. Its like a 20$ part, just takes like a 35mm wrench or socket.
The surging comes from improper communication between the EZL and the trans, the trans doesn't know where the engine is, and it wants to retard timing right before the shift so its like guessing. Its like a 20$ part, just takes like a 35mm wrench or socket.
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 35
Likes: 1
From: Philippines
1992 500E, 2000 E55, 1993 964 RSR, 1973 911 RSR Replica, 1959 Lotus Cortina Ogle
I took the car for a spin today and the misfire seems worst now. When I went full throttle the engine started to surge again and when I stopped, It feels like the engine will die on idle. In fact, I had to step on the gas a little just to keep the idle up. The engine was misfiring even at low revs now. BTW the SRS warning liight was going on and off. Any help would be appreciated. Thanks.
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88-300CE TWIN TURBO, 99-C43, 05-G55K, 71-280SL, 94-E320 CAB, 08 CLK63 BLACK SERIES
I took the car for a spin today and the misfire seems worst now. When I went full throttle the engine started to surge again and when I stopped, It feels like the engine will die on idle. In fact, I had to step on the gas a little just to keep the idle up. The engine was misfiring even at low revs now. BTW the SRS warning liight was going on and off. Any help would be appreciated. Thanks.
Check your high tension ignition circuit as misfire as RPM increases typically can be from the coil.
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1992 Mercedes-Benz 500E
Thats a different problem. That sounds airmass or electric throttle body related. Those are usually the symptoms, but RBYCC is right, usually random warning lights are low voltage related. Do the lights dim and get brighter significantly with engine revs? May be a good idea to breakout the multimeter and check some voltages.
Last edited by Quicksilver500; Sep 27, 2010 at 09:58 PM.
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Thread Starter
Junior Member
Joined: Sep 2010
Posts: 35
Likes: 1
From: Philippines
1992 500E, 2000 E55, 1993 964 RSR, 1973 911 RSR Replica, 1959 Lotus Cortina Ogle
Thanks for the replies gentlemen. Anyway, I took the car for a spin again and this time I tried to depress the accelerator pedal all the way but short of actuating the downshift solenoid switch. Surprisingly no more misfires even at high RPM. Not sure now whats causing the misfire everytime the downshift solenoid is actuated?
Last edited by ceed09; Sep 28, 2010 at 02:11 PM.
