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Old 10-10-2006, 08:55 PM
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1988 300e with #4 code

I have a hard starting 300E,you have to depress accelerater to start,dies at idle occassionally.check engine light is on with #4 code,any suggestions?

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Old 10-11-2006, 01:25 AM
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Jim Forgione's DIY articles

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Early 16 pin code reader info

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Old 10-11-2006, 08:53 AM
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Location: Baton Rouge La
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I didn't know a 1988 model threw codes.

My CEL came on when my OVP went south. At the time my car would start and die...
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k

1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it

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Old 10-11-2006, 09:13 AM
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code 4 is the air flow position indicator, went thru volt test and ohm test all good also checked at the ecu and at wiring plug ,all good
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Old 10-11-2006, 10:55 AM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
you must really check out the "normal" causes of this problem -- bad idle control valve hoses, bad boot between air flow meter horn and throttle body, OVP relay, fuel pump relay, etc.

Any air leaks between the air flow meter and intake valves (including worn valve guides!) will cause starting and idling problems on KE-Jet systems.


1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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