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Old 07-09-2008, 12:57 PM
Registered User
Join Date: Jul 2008
Posts: 1
88 420sel missing at idle bad

Hi, I got a big problem: 88 420sel missing at idle and slight throttle. what we replaced all ready was the timing chain and guides, cams, fuel dist,plugs,wires,cap,rotor,heads where completly rebuilt,intake boot replaced injectors are the new brass type replaced aprox 6 months ago, checked wave form pattern of wires coil charge good burn (good after wire replacement) highway speed runs great just at idle and first excelaration has a hard miss. Compression is 160psi on all cylinders. any clue what to do next I'm lost or caught in a loop or something. please help me I'm staRTING TO GO INSANE

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Old 07-09-2008, 08:31 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Have you set the mixture by checking the duty cycle? Lots of posts on how to do this.

Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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