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Power tapers off north of 4k rpm 97 E300
P0400 code set. found cracked vac line on the intake manifold. Replaced all the lines at the flappers on the crossover pipe and intake manifold. Now have p0200 code every startup.
Also, when hitting the throttle, it will go to 4k and above, but be very anemic on power, when it finally upshifts down to 3k or so, it takes off. It very clearly has more hp at 3k than at 4k. Both fuel filters are fresh, as I suspected them first, but it still holds back at above 4k. I'm running B100, and have been for 72k miles. Adding Power Service white for the last 4 tanks seems to have helped somewhat, but its still anemic at high rpm. What are your thoughts (on either P0200 or no power above 4k)? Thanks
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Mark in MA 05 MB E320CDI 402k Granite Grey Metallic 05 MB E320CDI 267k Black 05 MB E320CDI 232k White 05 MB E320CDI 209k Tectite Grey 99 Dodge 2500 Cummins 5sp 148k 62 Jeep CJ-6 120k |
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-Any air in the fuel lines?
-Are any of the IP seals leaking?
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Ed -1984 Mercedes 190D 2.2 5-speed gray market(bought@30,000 miles) (Sold back to original owner@170,000 miles) -1999 Mercedes E300DT (245,000 miles) -1999 Mercedes S500 Grand Edition (80,000 miles) |
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are the 606 motors usually strong above 4000RPM?
cool! |
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No leaks that I've seen. No fuel smell at all and not a drop of anything on the garage floor.
Wouldn't air in the lines show up in some form at lower rpms? When I want to accelerate quickly now, I find myself hitting the throttle and watching the tach...as soon as it gets to 4k I feather the throttle to try and get it to upshift. Otherwise it will hang at high rpm with very little accelerating going on.
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Mark in MA 05 MB E320CDI 402k Granite Grey Metallic 05 MB E320CDI 267k Black 05 MB E320CDI 232k White 05 MB E320CDI 209k Tectite Grey 99 Dodge 2500 Cummins 5sp 148k 62 Jeep CJ-6 120k |
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PO200 Inj Circut seems like a strange code on a diesel with mechanical inj's.
Have you tried a different code reader to confirm the code? Has your crossover pipe been cleaned recently? Air flaps could be sticking limiting air supply at higher RPM.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
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On my car, some codes will make it seem to "hang" on a gear until well above 4k and then stop pulling. On your NA model, it depends heavily on intake tuning to create good flow throughout the power band.
I would triple check that all the vacuum lines are connected properly and the resonance flaps free to move.
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-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250 |
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Quote:
What I haven't yet messed with are the vac lines and components that are adjacent to the air filter box. Does anyone have detail about their function? I use a scangauge for a code reader.
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Mark in MA 05 MB E320CDI 402k Granite Grey Metallic 05 MB E320CDI 267k Black 05 MB E320CDI 232k White 05 MB E320CDI 209k Tectite Grey 99 Dodge 2500 Cummins 5sp 148k 62 Jeep CJ-6 120k |
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Quote:
http://www.peachparts.com/shopforum/showthread.php?t=216515&highlight=p0200
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96 E300d |
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Make certain the "vacuum vents" are clear also. Do that first, all you have do is remove that line from the transducer (or the vent from the hose) and go for a drive to see if the code trips.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
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I confirmed that I have vacuum supply to both valves near the airbox, and confirmed that I have vacuum to both flappers.
Confirmed the vents work on both valves near the airbox (one vents to the airbox, the other to a paper filter...both clear). Swapped valve...still comes up with P0200. Removed the crossover to confirm operation of the IM flapper. When I do this and start the car, P0400 code only shows up. When I return the crossover, P0400 disappears and P0200 returns. Confirmed that the flapper on the intake pipe before the crossover is also working. Everything I've checked so far is functional. How about the MAF sensor? Is there a way to check it or clean it?
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Mark in MA 05 MB E320CDI 402k Granite Grey Metallic 05 MB E320CDI 267k Black 05 MB E320CDI 232k White 05 MB E320CDI 209k Tectite Grey 99 Dodge 2500 Cummins 5sp 148k 62 Jeep CJ-6 120k |
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You can clean it with CRC MAF Cleaner (spray), no equal. If the MAF were bad you ought to get PO100.....
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
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did you ever figure out what this problem was?
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1987 560SL - 95K 1996 E300D - 183K 1997 E300D - 162K 1982 240D - 160K |
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I just helped a guy today with a similar problem in a 95 E300D, he put in new filters, ran DP about 5 times, once MMO - all remained the same, no solid power above 4000 - 4200 rpm. Came out to be a partially blocked tank strainer. I had one lying with me, the car returned to normal power.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
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