Hi guys,

I have a 1990 300CE with a no start condition.

Previously it had been randomly not starting - mostly when hot. No pattern, it would just crank and crank - then when left for a while start.

It was driven home, and has sat for a few weeks, now it wont start, just cranks most of the time. Occasionally you get a blahhhhh sound from the throttle body.

Injectors are getting fuel under pressure - haven't checked pressure yet though.
Appears as though there is spark at the plugs.

I'm thinking it could the CPS - however if this was faulty would this mean there was no spark ?

Or a weak coil...

Could someone help out with the test specs so I can test the coil and CPS with a multi meter ?

I'd check the ICM aka EZL on the drivers fender. Pricey replacement but a failure can give you a no start condition. Check voltage or try taping it a few times.

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Check the voltage of what ? At the EZL? If so which pins ?

I have the specs for the CPS so Ill check that tonight.

All my sources tell me that if the EZL is dead you wont get spark, but I clearly am. And Fuel as well.

This could be a bit tricky. IIRC this, at least in the US, is an M104 but with CIS-E injection. Given the circumstances of the failure, immediately I would think fuel pump relay. BUT again, I think this might not have one, isn't the fuel pump controlled by the MAS relay? Hmmmm. I have even replaced a few MAS relays but has been a while. Can you run a meter or test light to the fuel pumps? I know you say it has pressure but is it enough? Might be easier to just check for power to the pump instead of pressure.
Early 90s are just a bear for info, every year or 2 there were major changes.
Gilly

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It has a 103 engine, and also has a fuel pump relay.

Pumps run when key is on, loosened an injector hose and get fuel spraying out at pressure.

What sort of current should the pump be drawing, is this relevant ?

correct me if wrong but you have a 300ce with 103 engine and cis injection?

__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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I know it's been a while. Had to setup another account as forgot password on old account.

But car has come out of storage and issue disappeared for a while. Now it seems to present its self in the following way.

Cold start great. Hot let cool down for an hour. No start. Cool to cold starts.

Not easily reproducible. happens once then won't happen for weeks.

Tested the cps again. 800 ohms cold. 960 ohms hot. Believe this is still in range.

When it does fail to start, it sounds like the timing is all wrong.

We will replace dist and rotor, and report back.