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#1
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87 Euro 560SEC irratic missfire
When I bought this car, I got it to run like a scalded ape. It was fast and smooth.
Recently, i've had a bad miss which I've been trying to chase down. I initially thought it was a bad fuel distributor or injectors caused by bad gas so I pulled the injectors and checked them. Some of them were a little weak so I replaced all of the injectors and I got the car to run very well at idle with a silky smooth idle. This ran for a while then it would develop a miss on and off. After a long drive, the miss would get worse. I've been able to disconnect the electrical connection to the EHA and get the car to idle better. I've checked for vacuum leaks but could not find any. The vacuum gauge on the dash is pinned to the left until the car develops a miss and then it will move towards the center (about 1/2 way between far left and center). I swapped out the EHA with another that I had on shelf but this did not change the symptoms. What else? 02 sensor ? if so , how to test? Blocked cats? Computer?
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With best regards Al |
#2
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Plugs okay?
Ohmed out the wire set? Inspected the cap and rotor? Coolant temp sender to computer?
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#3
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Most miss-fires are ignition related, how are the plugs, wires, cap & rotor??
Also have you checked the basic distributor alignment?
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#4
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Quote:
If it was ignition, the poor running will usually be constant.
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With best regards Al |
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