Help with serious engine vibration at idle; 1984 500SEL
Thread Starter
Newbie
Joined: Sep 2024
Posts: 3
Likes: 0
500SEL
Help with serious engine vibration at idle; 1984 500SEL
Help! My 1984 500SEL (US Spec), has a serious engine vibration at idle up to around 2000 rpm.. it also stalled a few times on initial start up then proceeded to get worse. My mechanic (not a Merc mechanic I live in the middle of nowhere) said it was the wrong kind of spark plugs and changed them and initially it worked, but he started it up again and the problem has persisted. He thinks it's the injector pump... (Do they have an 'injector pump' per se?). Any advice would be appreciated.
MBWorld Fanatic!
Joined: Feb 2012
Posts: 2,611
Likes: 1,209
From: Phoenix
222 S-65
OP your ‘84 500 SEL will have K-Jet for fuel injection. First thing to do is find a competent mechanic who is familiar with the car. Jethrow who can’t figure out a simple misfire is not going to be your guy.
Misfires.... Can be fuel, ignition, vacuum leaks (false air) or mechanical.
It is plenty old enough to be having issues with any of the above.
Misfires.... Can be fuel, ignition, vacuum leaks (false air) or mechanical.
It is plenty old enough to be having issues with any of the above.
Trending Topics
Member
Joined: Aug 2020
Posts: 91
Likes: 5
w203, E230 W210
why would he need a good mechanic for a K-jet in the first place if it is one of the most demanding carburetor adjustment systems, then actually all owners of these models would need it, but they clearly don't have it. The problem is not in the K-jet
Last edited by cylaptor; Sep 3, 2024 at 01:06 AM.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Feb 2012
Posts: 2,611
Likes: 1,209
From: Phoenix
222 S-65
You’ve not seen issues with K-Jet?
Junior Member
Joined: Dec 2006
Posts: 41
Likes: 3
From: London
300sel- w109 .1971
Help! My 1984 500SEL (US Spec), has a serious engine vibration at idle up to around 2000 rpm.. it also stalled a few times on initial start up then proceeded to get worse. My mechanic (not a Merc mechanic I live in the middle of nowhere) said it was the wrong kind of spark plugs and changed them and initially it worked, but he started it up again and the problem has persisted. He thinks it's the injector pump... (Do they have an 'injector pump' per se?). Any advice would be appreciated.
Start with fuel syestem check :
1 replace the fuel filter.
2 "there is a fine mesh filter in the delivery pipe end at fuel distributer, likely that is clogged from the symptoms you have mentioned including a normal start.
proceed on from more fuel pressure check and volume,
