My son replaced the plugs in his 94 E320 and now it acts as if it has a rev limiter at 4000 rpm, it just will not go above that rpm and coughs and sputters and surges until it falls below......Any ideas?

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'86 190E 2.3-16V 160K
'89 190D 209K For Sale
'95 SL320 86K Sold
'95 LandRover Disco 130K Sold

In N or P only ???????????????

It does have a 4k RPM rev limiter if not in gear.

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2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

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1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

Thanks guys, that was it. Runs fine in drive

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'86 190E 2.3-16V 160K
'89 190D 209K For Sale
'95 SL320 86K Sold
'95 LandRover Disco 130K Sold

The over-ride speed for this torque converter protection limiter system is 12 MPH.. so an easy test is to go 15/20 mph and then shift to N and the limiter circuit will be void and the rpm will excede the 4K.........this is a system road test only.

Also, advise him to use Bosch F8DC4 copper core plugs with that 104 engine..

Appreciate it! Though I'm thinking the way he drives maybe the rev limiter is not such a bad thing

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'86 190E 2.3-16V 160K
'89 190D 209K For Sale
'95 SL320 86K Sold
'95 LandRover Disco 130K Sold

Just a Question..... Why does he want to rev an engine that high or higher without a load on it?

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.