spark plugs right part number

[motor gear head]

Hi i was wondering if my brand new sparks plug are the right part number for my w124 e420 1995 m119
part number no. A 003 159 68 03
Thank you

 

[gsxr]

If they are Genuine Mercedes, then yes, those are correct. Gap at 1.0mm (slightly larger than spec).

 

[motor gear head]

thank you soo much

 

[motor gear head]

i have one more problem my engine keeps misfiring and back fire and literally throwing fire at the back and finally after 30mins of being started it just dies at idle.

 

[gsxr]

Sounds like the in-famous problem with caps/rotors. If you have access to SDS with HHT-Win you can pinpoint the specific cylinders at fault, usually all from one distributor cap (usually the passenger side). Search the forum for previous discussion. Here's a few to get you started:

M119 engine coughs, stutters, backfires, won't rev | M119 Engine

We have acquired my in law 1995 E420 with only 54k on the clock. Several months ago, I changed oil, brake fluid, installed new pads & rotors, replaced 12 year old Michelins, fuel filter and caps/rotors ...car ran great, 23mpg highway. After sitting for about 3 weeks, it made it about 2 miles and...

www.500eboard.co

FYI - Essential M119 Ignition "Tune Up" mods [Distributor cap vent / slot] | M119 Engine

Moderator edit: In addition to cutting extra vent slots to reduce/eliminate condensation inside the caps causing misfiring, oil leaks must also be completely eliminated from the cam solenoid and exhaust cam seals. If there's the slightest trace of oil at the lower edge of the cap, this misfire...

www.500eboard.co

Thoughts on moisture problem inside insulators/and distributor caps :VIDEO | M119 Engine

Last I recall, even the OE MB dealer caps are plain Bosch without the clearcoat applied... same as aftermarket Bosch. However, I've never bought a pair of OE caps so I'm not sure if this is accurate. And, if you were able to obtain some old stock caps, they may still have the clearcoat applied...

www.500eboard.co

 

[motor gear head]

ill be lost with out your help.im currently documenting the e420 restoration on my tiktok on @motorgearhead
gsxr man u reliable as hell thank you again

 

[Benzy Boy]

If they are Genuine Mercedes, then yes, those are correct. Gap at 1.0mm (slightly larger than spec).



View attachment 173243 View attachment 173244

I didn't gap mine larger than spec. Is it a big deal?

 

[gsxr]

I didn't gap mine larger than spec. Is it a big deal?

Nope, it will be fine at standard gap. The larger gap can help with the intermittent hot-idle hiccup, search the forum for more discussion on this.