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#1
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Code P0303 Power Loss on E55
Hey gang;
Need some advice here on where to start... 2000 E55, 46,000 miles, original plugs, wires. Replaced MAF and air filters about 2000 miles ago. Seems to be running OK with no pronounced miss or rough idle. There is a noticable loss of power at highway cruising speed, 60MPH on up. Engine seems to be running at a higher temp then normal. Sometimes, there is an coolant odor in the garage, no visable coolant loss. Yesterday the check engine light came on with hard acceleration. Code P0303 and some random misfires stored. I reset the codes and the check engine light did not come back on. I'm thinking of starting by replacing all the wires and plugs with copper core-or should I start by replacing juyst the #3 plugs and wires? Any suggestions? Should I be looking somewhere else? Thanks. Gary
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00 Silver/Black AMG E55 96 DCM Impala SS 94 Admiral Blue ZR-1 81 Candy Apple Corvette Cpe Last edited by zrusny; 06-17-2005 at 11:47 AM. |
#2
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IT IS POSSIBLE THAT THE CAT IS PARTIALLY BLOCKED.i HAVE A CAR IN THE SHOP DOING THE EXACT SAME COMPLAINT,I'L LET YOU KNOW WHAT IT IS WHEN WE FIX IT.
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#3
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Start by replacing the spark plugs, MB/Bosch suggest a MAXIMUN life of 5 years OR 100K which ever comes FIRST!
OR you could switch a coil & spark plug wires from a different cylinder & see if the problem moves to that cylinder!
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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 your fan is not capable of operating from as low as 10% to as high 90% with several stages in between then I might suspect it may answer your “running hotter” than normal complaint. FWIW: Just another .02 in the kitty |
#5
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Missing Adaption
After Changing The Missfiring Cylinders Wires The Car Was Doing Exactly What You Are Describing, Loosing Power And Such. All That Needed To Be Done Was To Reset The Crank Shaft Sensor Adaption. This Will Have To Be Done At A Dealer With Star Diag. Tester.all It Does Is Resets The 5 Operating Speed Ranges In The Ecm.this Is Not Common But In Certain Instances Will Need To Be Done When A Missfire Is Present.
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#6
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Sensor ring adaptation is reset to original coding by a scan tool, but actual adaptation is done on the road or dyno. It sort of takes a tool to know that one is in the load/rpm block to adapt the first block. After that the rest are left to adapt themselves. Untill some level of adaptation is achieved the controller won't recognize a misfire. Not that it couldn't, it just needs that level of adaptation for the software to allow it.
Full load misfires due to cat restrictions are common on that motor. I would probably replace the plugs as stated for the time reasons stated and then not do anything else till another code appears. I would probably also move the coil packs to an adjacent cyl and note that at the same time. If the problem has anything to do with cats or overall mixture, the misfire will likely appear on a different cylinder. If a repeat misfire comes from the cylinder that now has the pack that was on #3 previously then I would replace the wires on that cyl and repeat the testing.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
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