High Idle @ 1500rpm when car warm/hot, won't kick down below 1000rpm until put in D gear

95

Asked by Jun 13, 2012 at 02:46 AM about the 1991 Mercedes-Benz 300-Class 4 Dr 300E Sedan

Question type: Maintenance & Repair

Been experiencing a high idle issue when my 91 300E is warm/hot. Revs up to 1500rpm and will rev down to 1000rpm when hit the gas pedal but will climb back right back up to 1500 and stay until put in D gear. Any advice?

2 Answers

365

most common is vacuum leak,could be any hose on intake,idle motor might be stuck,but I would check for leaks first,inspect,and listen for hissing noise,to only rev it up 800 rpm its probably small.

ever resolve the issue?

Your Answer

Mercedes-Benz 300-Class Experts

  • #1
    James Ramond
    Reputation
    240
  • #2
    Tom Demyan
    Reputation
    220
  • #3
    COMETGUY61
    Reputation
    200
View All

Related Models For Sale

Used BMW 3 Series
1,128 Great Deals out of 32,992 listings starting at $1,000
Used Mercedes-Benz SL-Class
61 Great Deals out of 2,920 listings starting at $4,500
Used Mercedes-Benz G-Class
13 Great Deals out of 1,143 listings starting at $21,995
Used BMW 5 Series
431 Great Deals out of 16,277 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.