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Unable to start (no ignition?)

  • kenguan76
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2 months 4 days ago - 2 months 4 days ago #19430 by kenguan76
Unable to start (no ignition?) was created by kenguan76
Hello!

My friend has a Zenair CH701 with Rotax 912UL, usage is quite low, average of around 1 hr flight time every 5 months or so.

Recently tried to start up, but able to crank with no startup. After some troubleshooting it is suspected there is no ignition. He replaced all spark plugs, still nil joy.

Then he removed all spark plugs from the cylinders and observed 2 spark plugs from the same cylinder while cranking the engine - no spark at all.
Could it be (highly unlike but possible) both e-mags are unserviceable or is could there be another fault?

Cheers!
Last edit: 2 months 4 days ago by kenguan76. Reason: Typo

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  • Roger Lee
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2 months 4 days ago - 2 months 4 days ago #19431 by Roger Lee
Replied by Roger Lee on topic Unable to start (no ignition?)
It is more likely the battery. The engine probably isn't turning fast enough. Either jump the battery or try it with a known well charged battery. Full choke and crack the throttle. Until the battery is ruled out it should be your number one suspect especially with this aircraft use schedule.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell
Last edit: 2 months 4 days ago by Roger Lee.

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2 months 3 days ago #19436 by kenguan76
Replied by kenguan76 on topic Unable to start (no ignition?)
The battery is fully charged prior to the unsuccessful start.
Also, the ignition check was carried out with spark plugs disconnected from the cylinders, so it was cranking faster than a normal starting crank speed, but nil ignition.

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  • Bill Hertzel
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2 months 3 days ago #19438 by Bill Hertzel
Replied by Bill Hertzel on topic Unable to start (no ignition?)
Let me ask the Obvious...
Are the Ignition switches ON (Open)???

You might want to place a Meter across them to confirm this.

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2 months 3 days ago #19440 by kenguan76
Replied by kenguan76 on topic Unable to start (no ignition?)
This airframe uses the key type of ignition/start: OFF LEFT RIGHT START

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2 months 3 days ago #19441 by Gyrochook.
Replied by Gyrochook. on topic Unable to start (no ignition?)
I see that you are from Malaysia. (hot and humid)
There are 2 black wires coming from your electronic ignition pack plugs which are attached to the inlet manifold with 2 separate 10mm bolts on the starboard side of your engine.
Undo these bolts and clean both the aluminium manifold where they sit with a small wire brush and the same with the copper lugs so that all of the surfaces are shiny.
If you have access to some lithium based grease apply a LITTLE of that to the surfaces that you have just cleaned. If these earthing points are corroded it will play havoc with your ignition system.

Regards.........Chook.

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2 months 1 day ago #19467 by Kevin Stewart
Replied by Kevin Stewart on topic Unable to start (no ignition?)
It is not unknown for ignition modules to develop a fault where they can no longer start the engine. Sometimes, heating the modules with a hair dryer will allow them to generate a spark. If this is the case you have 2 options: replace them with new ones, or send them to Carmo Electronics in the Netherlands for repair.

You might say how can this fault occur to both ignitions. Well, when it happens to the first one you don't notice because the engine starts on the other module and then when it is running at normal speed, the faulty ignition works correctly. It is not until the second unit develops the same fault that you then cannot start the engine. This is certainly not an uncommon fault in the UK as many owners have discovered including myself!

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  • Roger Lee
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2 months 1 day ago #19470 by Roger Lee
Replied by Roger Lee on topic Unable to start (no ignition?)
I prefer using ice over the module for approx. 30 minutes. Put some ice in a one gallon baggie and put it around the modules for 30 min. At the end of that time if it starts right up buy another pair of modules.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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