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 ?