ray_hennig
MB Enthusiast
300CE-24: Injector and Coil change - Optimism
Decided to invest €500-ish and bought a set of injectors, seals and guides, plus a Beru ignition coil.
Why? Due to 30 seconds of hot start misfire and repeated stalling on selecting neutral.
Had a degree of misery removing one of the injectors (access) and breaking a little vacuum hose that was causing the misery. Finally got 6 shiny new injectors installed and switched on. Also, mended the little pipe with Araldite, sticky tape and cable ties - hmmmmm.
No evidence of leaks, all looking good. After a degree of churning, it fires up and settles into a perfect fast idle. We left it idling, checking again for leaks. All looked good.
Idle then settled down to an even, smooth 700-ish so we switched off, installed air filter and when for a test run. Faultless, if slightly gutless. Went back and checked duty cycle. It had drifted up to about 67% so I re-adjusted to around 50% and things seemed better.
An interesting point is that, with the old injectors it was generally more difficult to set the duty cycle. Also, 50% at idle used to shift to about 65% at 2000. Now, the 50% is easier to set and 2000 gives a value of around 55%. This feels better to me.
Result: more spirited performance. During all this, it managed to stall almost every time I selected neutral. So, I fitted the new coil.
WHY DIDN’T I REPLACE THIS €80 COIL EARLIER? One reason is that I had another MB coild in stock and did swap them over some time in the past with no noticeable change. Oh well!
No more stalling and the idle, when moving D-N-R or R-N-D, is MUCH more stable.
That was yesterday and I’ll be doing a bit of driving today to evaluate the thing. So far, I’m more than satisfied with the investment.
More if there’s anything of interest.
Best to all.
RayH
PS: I'm seeing reports of dubious Beru quality. Comments anyone?
Decided to invest €500-ish and bought a set of injectors, seals and guides, plus a Beru ignition coil.
Why? Due to 30 seconds of hot start misfire and repeated stalling on selecting neutral.
Had a degree of misery removing one of the injectors (access) and breaking a little vacuum hose that was causing the misery. Finally got 6 shiny new injectors installed and switched on. Also, mended the little pipe with Araldite, sticky tape and cable ties - hmmmmm.
No evidence of leaks, all looking good. After a degree of churning, it fires up and settles into a perfect fast idle. We left it idling, checking again for leaks. All looked good.
Idle then settled down to an even, smooth 700-ish so we switched off, installed air filter and when for a test run. Faultless, if slightly gutless. Went back and checked duty cycle. It had drifted up to about 67% so I re-adjusted to around 50% and things seemed better.
An interesting point is that, with the old injectors it was generally more difficult to set the duty cycle. Also, 50% at idle used to shift to about 65% at 2000. Now, the 50% is easier to set and 2000 gives a value of around 55%. This feels better to me.
Result: more spirited performance. During all this, it managed to stall almost every time I selected neutral. So, I fitted the new coil.
WHY DIDN’T I REPLACE THIS €80 COIL EARLIER? One reason is that I had another MB coild in stock and did swap them over some time in the past with no noticeable change. Oh well!
No more stalling and the idle, when moving D-N-R or R-N-D, is MUCH more stable.
That was yesterday and I’ll be doing a bit of driving today to evaluate the thing. So far, I’m more than satisfied with the investment.
More if there’s anything of interest.
Best to all.
RayH
PS: I'm seeing reports of dubious Beru quality. Comments anyone?
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