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Recently my 2001 E430 4-Matic has been experiencing multiple misfires of cylinders 3, 5, and 8. At first the only misfire i had was the cylinder 5. Shortly after scanning the car that was the only code i had. i believed the injector was getting gunked up and not being able to spray as good or at all so i decided to buy new injector filters, O rings, and Caplets (mind you that the last gut that had it had metal washers on the injectors instead of caplets?). Regardless, no matter how well i cleaned out the injectors, the cylinder 5 decided to still misfire. I had even swapped over a working injector from another injector and the engine stayed the same. Now a couple months later i have three misfire codes and a multiple random misfire code. Could it be spark plugs? Coil Pack? Wiring Harness? I have no clue as where to start so i come to you guys to give me advice on what i should do next.
When was the last time the fuel filter was replaced? If it's been I while I would start with that. I would also check the fuel pump for leaks as well.
I had a problem with misfires when I pressed the accelerator more than halfway. I changed the fuel filter and while I was working on that I noticed that the fuel pump was leaking while the engine was running. I then replaced the fuel pump. After that I didn't have a misfire problem. Not sure which one was the culprit.
When was the last time the fuel filter was replaced? If it's been I while I would start with that. I would also check the fuel pump for leaks as well.
I had a problem with misfires when I pressed the accelerator more than halfway. I changed the fuel filter and while I was working on that I noticed that the fuel pump was leaking while the engine was running. I then replaced the fuel pump. After that I didn't have a misfire problem. Not sure which one was the culprit.
I have not checked either of those but that seems like a very good idea. thanks for the advice. ill get back on the thread if those dont seem to work out.
The ceramic elements in the Front Cats tends to break down over time and/or vibration (suc as a failed engine mount) and "chunks" of that element can blow back to the Rear Cats (which are a can with a grid/checken-wire in them.
This "chunks" can cause added backpressure on that side(s) - diagnosed by putting up on a rack - running at operating temp - rear exit front cat temp should be significantly higher than temp at the front entrance to the cat - which testifies that cat is still functioning - followed by a "rubber mallet" test to see what kindof loose rattles are in the front and rear cat. If rear cat is diagnosed with chucks - it gets cut out - cleaned out - and welded back in. If front cat has rattles - which is normal - see if exhaust at tailpipe on both sides it about same exhaust pressure.
Clean your MAF. After cleaning it, you'll most likely get more misfires. CRC MAF cleaner.
btw, what did you use to cleanout the injectors? mileage?
It just happens the person i bought it from bought a MAF sensor just because they tend to be a common culprit with the W210. I will try to clean out the current one but if i dont see a change i will try to swap in the new one. I took each one out and used some brake cleaner to get all of the gunk and stuff out before i put in the new filters. The car has 174k miles on it currently and i dont know if it was used daily before it came into my posession,
The ceramic elements in the Front Cats tends to break down over time and/or vibration (suc as a failed engine mount) and "chunks" of that element can blow back to the Rear Cats (which are a can with a grid/checken-wire in them.
This "chunks" can cause added backpressure on that side(s) - diagnosed by putting up on a rack - running at operating temp - rear exit front cat temp should be significantly higher than temp at the front entrance to the cat - which testifies that cat is still functioning - followed by a "rubber mallet" test to see what kindof loose rattles are in the front and rear cat. If rear cat is diagnosed with chucks - it gets cut out - cleaned out - and welded back in. If front cat has rattles - which is normal - see if exhaust at tailpipe on both sides it about same exhaust pressure.
Keep the beat !
Hey thanks for more information on possible issues, i just changed the feul filter and the last person hadnt even changed it since it was bought! obviously there are many things that seem to be wrong with the car but im slowly replacing worn out parts every chance i get!
As others have stated, start with the free stuff and go from there. MAF clean, check vacuum lines, ensure adequate fuel pressure at rail (rent a tool to measure), clean your fuel check valve, clean EGR valve, hit cats with hammer, check spark plugs, also check under hood with car running in the dark to see if wires have failed and are grounding out on the engine block.
Hey guys I have some good and some bad news. good news is that i replaced all the spark plugs with Bosch Platinum Tip Fine Wire #6702, and have seen some performance improvements. Bad news is that the 4 misfires are still present Nasty dirty and rich! I don't think they've been replaced in a long time! 174,445 Miles and everything seems to be pretty edgy
Last edited by Benzooo; Sep 29, 2018 at 12:39 AM.
Reason: messed up writing
1st question - are you saying "Misfire Codes" are still present - or are you saying "you feel the misfires" ?
2nd Question - have you "checked" the cats yet ? 1st check - on a lift - engine running - engine at operating termperature IR thermometer - exit temp at the back/exit of the front cat should be higher than entrance/temp front of the cat - which shows front cats operating. 2nd test - engine off - use a rubber mallet to tap/bang the bottom each rear cat listening for "chunk rattle" of loose stuff in the rears - you can gently tap each front cat - usually there will be "chunk rattle" which can be OK. It's the rear's - which have a mesh screen in them - chicks can get caught there leading to blockage/added back pressure that side .
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2001 E430 Multiple Misfire Issue
