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Old 12-14-2016, 05:04 AM
chazola's Avatar
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Join Date: Nov 2003
Location: Dorset, United Kingdom
Posts: 1,239
M104 Warm Start Idle Issue

Hi, my M104 S124 320 with HFM ('93), has a slightly annoying issue- cold starts are perfect, with steady idle, driving is fine etc, but warm/hot starts (engine off for a few mins to up to an hour or so), it feel like I have a miss at idle with some trembling. After giving it a bit of gas and driving off, the car feels fine. Anyone had similar symptoms?

Fuel filter is new & recent, throttle body has been cleaned & linkage adjusted, Coolant temp sensor is new, plugs are new and correct type, coils recently replaced with new and bad bits of wiring harness replaced. Fault codes read show no faults in the HFM system memory.

1993 320TE M104

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
"music and women I cannot but give way to, whatever my business" -Pepys
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Old 12-14-2016, 05:59 AM
oldsinner111's Avatar
once a happy man
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,826
inspect wiring harness,after checking to see if coil might have green corrosion.Mine does that sometimes.
plant, and animal life matter. human's had their chance.
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Old 12-14-2016, 06:07 AM
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thông tin thực sự hữu *ch cảm ơn bạn nhé
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Old 12-14-2016, 10:07 AM
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Join Date: Feb 2007
Location: los angeles
Posts: 707
check fuel pressure regulator may be leaking and engine sucking up fuel causing miss, or leaking injector, both can be checked with fuel regulator
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Old 12-14-2016, 10:50 AM
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thông tin thực sự hữu *ch cảm ơn bạn nhé

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