1984 Mercedes Benz 500sel Engine Miss at low RPM

1984 MERCEDES BENZ 500SEL
251,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
ROBERTCG
  • MEMBER
  • 1 POST
After engine warms up engine misses badly at low (under 750-850) RPM. At speed car runs beautifully with good power and acceleration.

Mechanic tells me coil is putting very high voltage(?) because plug wires and distributer cap/rotor causing too much resistance. I have had this car from 138,000 miles to now 251000 miles and have never changed plug wires.

Does this sound like an accurate diagnosis?
Feb 12, 2010 at 1:39 PM
Advertisement
Avatar
BUDDYCRAIGG
  • ✓Experienced Mechanic
  • 2,262 POSTS
it is possible, electrical items normally develop more resistance as they heat up.

and if you haven't changed the plug wire for that long, then you're due.

you might also want to replace any other tune up parts that haven't been changed in the last 50,000 miles.
Feb 12, 2010 at 6:20 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question