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#1
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86' 420 High Idle Problem
Q. I just replaced the Idle slide valve on my 86' 420SEL. However, it idles a little high now.(1400rpm in park; 950rpms in drive) Hence, what adjustment should I make in order to bring the idle down to normal range.(750-900rpms in drive/park) Otherwise, the car drives fine.
Note: Interestingly, before purchasing a 380SE sometime ago, it had a high idle problem and my mechanic replaced a blown fuse that controls the idle in the main fuse box. And the idle returned to normal. Could this be the solution? Also, he checked the idle by using a special tool that looked like a long flat-head screwdriver to check the idle adjustment in the top of the air box. Thus, could this also be the solution? I appreciate feedback on this issue. Thanks! |
#2
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Yes. It called the OVP relay. Check the fuses inside it or replace with a good one. It's a common problem.
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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D 380SE 1984 <------- Totaled by flipping accident 300SE 1988 <------- Sold Volvo S70 2000 <---- 4 family Opel Omega 2002 <-- 4 family 560SEC 1989 <------ Sold 560SEL 1990 <------ Sold 560SEL 1991 <------ 4 my mother 560SEL 1989 <------ Sold 600SEL 1992 <------ Current http://search.ebay.com/_W0QQsassZkhazenzcc |
#3
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the idle on an 86 420sel is controlled by a module behind an angled panel in front of pass.under glovebox.it maybe original and may need replacing.check if it's getting power.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
#4
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You're right!
I stopped pass my mechanic's shop today and he showed that this was the problem. Hence, I ordered a new one to arrive on Thursday. Next week, this one goes in to be repainted. Thus, can't wait to see the results. Thank all for your feedback!
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