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Old 06-13-2018, 08:32 PM
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Join Date: Jun 2018
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M103 struggles on cold start

I know this topic has been covered in other posts, but I have a particular problem that I cant seem to find the solution to. My 1990 300E 2.6 struggles and sometimes stalls on cold start. My cold start valves seems to function just fine. Tested with 12v. My 7th injector seems to work as well. I removed it but still left it connected to the fuel line and connected 12v to it and sprays nicely. I replaced my OVP again. No avail. Replaced the following items last year as well : coil, dist cap, plugs and wires, fuel filter, serpentine belt, belt tensioner, coolant temp sensor (2 prong) any help to my problem would be greatly appreciated. Otherwise to the dealership I go 😅
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Old 06-15-2018, 11:28 AM
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Toss a set of gauges on the fuel distributor. Need to check running pressure, differential pressure, and residual pressure. There is a way to test the accumulator, but I forget.

I spoke with CIS Flowtech on the phone for a while as my M103 car coughs/misses on cold starts and irritates me. It has good cranking compression 160psi+ and recent full head job. They are pretty sure my FD is leaking down internally, which makes sense. The Ethanol fuel has eaten up one. Doubt my injectors are the issue as the car has not sat for extended times, but could be one.

It fires INSTANTLY cold, then dies. Cranks, need a bit of extra throttle on and off fast (more air to clear flood I figure...), starts, and acts like has a miss. Clears it throat and runs fine. It is related to the EFI, once running car is fine.

Hell, it just made a full power pass at 120mph a few weeks back. Yes, it was closing on redline. I was around 6000rpm sustained. Not bad for 325,000 miles.

You may simply need to tweak the EHA to bump or reduce differential pressure.

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