300ce m103/I'v got no idea

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ajfranco
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300ce m103/I'v got no idea

Post by ajfranco » Fri 15 Jun, 2018 7:00 pm

Hey Guys.
I'm going to try and put my troubles into words......not feeling confident.

'89 300ce m103.

Car starts and runs well when cold, its gets to operating temp(80-90 degrees) then turns to faeces.In Park, it starts to spit fuel out the exhaust at an alarming rate. The vacuum fuel consumption gauge moves to half way when under load at the lights in drive and sits about 600rpm and falters, though not stalling but very close.. You have to be so gentle to even get the car off the line, it has no power and the fuel gauge sits in the red through gears 1-3. Between 500-2000rpm, the car revs like its got a sore throat but once it gets above 2000rpm it revs freely. during a 30-40min drive it will behave like this 3/4 of the time, then randomly when your at the lights, it will give a quick surge in revs and return to perfect running, with the fuel gauge reflecting this. 10 mins later, back to its bratty behaviour. temp and oil pressure gauge are all running as they should. I tested all the cylinders/leads when running good and bad and there is spark on each cylinder.

so far I have replaced/repaired over the past year, admittedly not all at the same time.

.fuel tank removed/cleaned in acid bath by radiator repair shop
.new fuel strainer
.new fuel sender
.fuel lines cleaned and cleared.
.2x new fuel pumps
.fuel accumulator
.fuel filter
.fuel regulator
.6x injectors, o-rings, holders, seals
.6x spark plugs
.6x ignition leads
.air flow pentiometer
.02 sensor
.rotor button
.distributer cap
.thermostat
.voltage regulator
.fan belt controller
.fan clutch
.new battery
.oil level sensor
.oil pressure sender

all parts are bosch or oem equivalent. essentially a whole new fuel system, bar the fuel divider/distributer and the EHA. Its been running well for over a year, but the last month. piece of dogss%^t. Car has 217,000klms on the clock, very clean, Australian delivered, full service history etc.
Is anyone in melbourne that would be able to have a listen/look for me? beers for you.I'm so sick of it


Any help would be great

Andre

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Re: 300ce m103/I'v got no idea

Post by Strapless » Fri 15 Jun, 2018 9:23 pm

Hi aj,
I'm a noob with sfa experience but I've noticed a common m103 fault is with the Idle Control Valve and u haven't replaced that or the hoses that got to and from it, or the OPV relay.

I don't want to just give u yet another LIST of parts to throw at it but these were common to my idle issue searches.

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Ivanerrol
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Re: 300ce m103/I'v got no idea

Post by Ivanerrol » Fri 15 Jun, 2018 9:38 pm

In the distributor behind the rotor button there is a round insulating disk - it's usually orange or yellow. Over time these break down and misfires can occur with spark short circuiting through the disk to the body.

There are two very small rubber washers on the EHA. If they are perished the EHA usually leaks a small amount of fuel - sometimes you can smell it.
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ajfranco
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Re: 300ce m103/I'v got no idea

Post by ajfranco » Sat 16 Jun, 2018 3:07 pm

hmmmm, Thanks guys.

I checked the EHA for visual leaks, Doesnt appear to be any, the two rubbers appear to be in reasonable shape. although the adjustment screw was very tight and i'm hesitant to adjust it.

I had a look at the OPV relay, the 10a fuse has not blown, but i didnt get a chance to test the voltage. I will do that.

The distributer cap and rotor button were replaced 12mths ago.......would it have worn out in that time? seems unlikely.....

Andre

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Ivanerrol
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Re: 300ce m103/I'v got no idea

Post by Ivanerrol » Sat 16 Jun, 2018 4:21 pm

I'm assuming proper Bosch or Beru Distributor cap and leads - non resistive plugs. Copper plugs not iridium or platinum or multi probed.
The plate I'm referring too is the round plate behind the rotor button.

Spitting fuel from the exhaust seems to mean misfire or a timing issue.

If you pull the plugs one by one, how do they look like?
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John Green
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Re: 300ce m103/I'v got no idea

Post by John Green » Sat 16 Jun, 2018 10:20 pm

ke-jetronic will work with the fuse pulled from the OVP, all you loose is idle speed control (it will be too slow), full load enrichment, and a richer mixture when cold. As a good easy test to check if it is an electrical gremlin, just pull the fuse once it has warmed up. If the faults continue I would suspect the ignition system.
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ajfranco
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Re: 300ce m103/I'v got no idea

Post by ajfranco » Tue 19 Jun, 2018 4:42 pm

OK.

So its getting worse, to the point where it is drives but definitely undriveable.

.checked the plugs, a bit of oil, nothing unusual plenty of gap and none corroded.
'beru leads, bosch distributer cap and rotor button.

removed the cap and rotor button, there does not seem to be a lot of wear

The plate behind the rotor button appears discoloured, kind of amber coloured. original mb part. How do i go about replacing this plate? seems stuck tight behind the rotor button mount.

Andre

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John Green
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Re: 300ce m103/I'v got no idea

Post by John Green » Wed 20 Jun, 2018 1:10 pm

You have to remove the rotor and then remove the alloy stub that it bolts to. This can be a real drama as they are very easy to break. I would leave that for now as I think your issues are elsewhere.

Bit of oil on the plugs does not sound right, there should be NO oil on the plugs. Have you tried a new set of plugs recently? They may not ultimately be the issue, it may be that it is running rich and that fowled the plugs, if so new plugs will be short term fix.

I presume that when the injectors, etc were done that the fuel mixtures were set correctly, using an exhaust gas analyser?
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Re: 300ce m103/I'v got no idea

Post by crazycrowbar » Sat 23 Jun, 2018 12:57 am

Hey Andre
Lots and lots and lots of troubleshooting info and answers on your topic here.......

https://mbworld.org/forums/e-class-w124 ... nosis.html

Groetnis

Pierre

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