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#1
04-07-2011, 12:54 PM
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M103 oil pressure at startup
The latest trouble with my 89 300TE is that it takes a few seconds for the oil pressure gauge to register pressure. It just seems to be a bit too long after sitting overnight. Once running, I have no concerns with pressure.
It has over 179k miles (odometer is dead), so I figure the first thing to check is if the electrical gauge is working by using a manual pressure gauge instead. Any other suggestions? Thx -CTH 
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#2
04-07-2011, 01:03 PM
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Quote:
on my 104...it drops to 0 at idle when it is warm...but immediately goes to 3 upon acceleration. on the 103 it is slightly above 0 at warm
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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 [/SIGPIC]
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#3
04-07-2011, 01:55 PM
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The 103 engine requires an oil filter with a check valve. Cheap filters typically dont have one. Without one oil will drain out of the filter as it sits, taking longer to come up to pressure on a cold start.
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 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#4
04-08-2011, 04:01 AM
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check the oil pressure sender unit. my oil pressure would shoot up to 3 when I was accelerating, but at idle it would rest at 0. eventually it only went up to 2.5 while accelerating past 40 mph. I replaced the sender unit and now it goes up to 3 when accelerating and is at 2 - 1.5 when idling.
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 1990 190E 3.0L
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