I tried to post before but i messed up. Here i go again. I have a 1997 e420 and its in limp mode. When i start it up it makes a zinging noise and slowly goes quite. If i rev the engine it goes zinggg ( hard to explain). When i drove it home in limp mode iit made a constant zinging noise. I pulled the codes with my reader and it gave me a P0730 incorrect gear ratio. I tried to look it up but it says its a generic code. The car has 110,000 miles on it and the black cap is still on the dipstick tube so i know it hasnt been serviced . Any help would be greatly appreciated . Thank you all Alawens

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With the V8 in front of it and no service or updates in 110K, its likely toast.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

1st step is removing the trans pan, most likely too late.

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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

Did you check the fluid level???

The "hard to explain" sound part is easy to fix...take your cellphone and record the sound and either post it as a video or take it to your favorite MB tech and have him listen.

Either way, someone with the right amount of experience should be able to tell your it's "Toast" or "Wundervoll!"

Inexperience, on my part, says that not enough oil is getting to the main bearings on the crankshaft...but then, I'm no expert. I slept at a "Sleep Inn" last night.

Really!

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M. G. Burg
'10 - Dakota SXT - Daily Ride / ≈ 172.5K
.'76 - 450SLC - 107.024.12 / < .89.20 K
..'77 - 280E - 123.033.12 / > 128.20 K
...'67 - El Camino - 283ci / > 207.00 K
....'75 - Yamaha - 650XS / < 21.00 K
.....'87 - G20 Sportvan / > 206.00 K
......'85 - 4WINNS 160 I.O. / 140hp
.......'74 - Honda CT70 / Real 125
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“I didn’t really say everything I said.”
. . . . . . . . . . . . . . . . . . ~ Yogi Berra ~