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Old 10-09-2018, 09:00 AM   #1
harrison541
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Default Injectors not firing

The engine used to start and run fine, but I couldn't get it going at the weekend.

I put oil down the bores and tried starting it and it burns the oil but then stops again so it looked like a fuelling issue. I took the injectors out and tried cranking it and nothing is coming out.

I've checked the wiring and it measures 1.6V on the brown/pink wires and about 2V on the other wire, which seems a bit odd.

I've checked the continuity from the injector wires back to the ECU plug pins and there's no breaks in the wiring.

Anyone got any ideas?

Thanks
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Old 10-09-2018, 10:07 AM   #2
AGoaty
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Are you sure the fuel pump is running and there is fuel in the tank?

Sorry if this seems obvious but you would be surprised how the simple things are overlooked.
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Old 10-09-2018, 10:27 AM   #3
harrison541
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I've made that mistake before!

I did think that was the problem, so I put 5L in and still had the same problem. If I disconnect the fuel line with the engine off, the line is still under pressure, so it is holding pressure at the injectors.
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Old 10-09-2018, 10:34 AM   #4
edk83
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I think you'll have to talk to the ecu, which mems is it?

I had an odd issue the other day, the ecu decided it didn't want to prime the pump any more. The pump runs from the factory relay and was running when cranking but no priming. Obd showed an error logged primary fuel circuit failure, changed the relay and it's happy again but the ecu must be monitoring the relay voltage and detected something wrong with it even though it was still closing ok
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Old 10-09-2018, 10:37 AM   #5
harrison541
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Its MEMS 3 VVC

When cranking, it seems to crank in 4 pulses then stop for a second, then 4 pulses etc, I can hear something clicking when it stops and starts again.

When it used to work it would only crank for 2 or 3 turns then start up, it did seem in decent condition!
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Old 10-09-2018, 12:17 PM   #6
AGoaty
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The only sensor I can think that would cause it not to run is the crank sensor. All the rest monitor once the engine is actually running.

I had an issue with mine a few years ago where it would run lumpy but actually broke down. Turned out the plate that covers the flywheel behind the starter motor was missing (after the garage swapped my gearbox ) and the crank sensor was open to the elements (it was snowing like mad at the time).

I swapped the sensor and got a replacement plate fitted. Had no problems since.

N.B. It's held with a bolt and use a 7mm socket to remove it. I bought a few engines with these rounded off where people use an 8...
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Old 10-09-2018, 03:12 PM   #7
edk83
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Can you hear the fuel pump running when cranking? After priming it only runs when cranking and it gets that signal from the crank sensor, so might be an indication.

If it's mems3 get an obd reader plugged in
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Old 10-09-2018, 09:09 PM   #8
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You usually have 12v at both pins and then the ecu earths one side to fire the injector. Have you got a small led bulb you can use as a noid light?


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