ibakes
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| posted on 29/6/24 at 08:05 PM |
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Starting issues
Evening all.
I posted the following on the megasquirt Facebook page. I jut a bit stuck and after inspiration for my westie. It's so close to going back on the
road but keep taking one step forward then one back
Evening all
I'm just finishing putting my car back together and had my car starting and idling with no problem.
It started each time and I ran through the warm up auto tune on Thursday, all was OK it stopped and started after this.
Later on Thursday while checking the alternator I touched the positive feed to the exhaust which caused a spark.
I since then. I can't get it starter. It just won't catch.
All fuses seem to be fine
I have spark, fuel, revs on turn over, charged battery
Any ideas would be greatly appreciated. I was hoping to play with the fuel auto tune a bit today
I'll get the map and logs uploaded shorlty
I'm not sure if me grounding the power quickly caused an issue and racking my brain but I haven't changed anything else.
Duratec 2.0 ms3 ford edis
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gremlin1234
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| posted on 29/6/24 at 08:23 PM |
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most likely you have fried one or more diodes in the alternator, causing them to short. easiest test is disconnect the alternator from the circuit and
try again.
reminds me of Marvin the Paranoid Android, and all the diodes down his left side :-)
edit, thinking about it a bit more, the fault above would just rapidly discharge the battery.
but still worth disconnecting the alternator and trying again
[Edited on 29/6/24 by gremlin1234]
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ibakes
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| posted on 29/6/24 at 08:33 PM |
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I'll give that a go in the morning
My test battery is old but 70A and did discharge quickly when turning it over
Would that cause the car not to fire. It doesn't even catch and then stall out
Guess that also means a new alternator
[Edited on 29/6/24 by ibakes]
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gremlin1234
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| posted on 29/6/24 at 08:57 PM |
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no, you are right, the symptoms make little sense,
I had a similar problem recently and giving the coil a better 12v feed while cranking allowed it to start. (conventional Lucas style circuitry)
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ibakes
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| posted on 29/6/24 at 09:19 PM |
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Its definitely worth disconnecting as a test so thank you. Cranking revs are at about 300rpm. It has backfired slightly from the exhaust a couple of
times after winding over for quite some time
It's going to end up being something stupid that I have missed as usual
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gremlin1234
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| posted on 30/6/24 at 07:40 AM |
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ah symptoms that sound like you have soaked the plugs with fuel,
so you may need to take the plugs out and clean/dry them.
I hope you put the battery on charge overnight too
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40inches
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| posted on 30/6/24 at 09:58 AM |
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I recently had the same problem.
It was a faulty cell in the battery. It was showing 12.5v, but dropping to 9.5v when cranking.
New battery and all is good
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ibakes
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| posted on 30/6/24 at 02:09 PM |
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Thanks all
Right battery fully charged (made that mistake before with a duff battery, voltage dropped too low)
I had my old ms1v3 which i plugged back in, this had started this engine before being changed out, this had the same issue so it not the ecu
alternator disconnected and still the same issue
Looking at the spark plug, slightly sooty and they do have fuel on them, so cleaned up and put back in, still the same issue.
I'll keep looking
I'm still in hope that i can take my son to school in it before he moves to secondary school and will be too embarrassed
[Edited on 30/6/24 by ibakes]
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ibakes
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| posted on 30/6/24 at 02:31 PM |
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Am I missing something, sorry i should have said I was using a spark light for my tests
If I remove a plug, rest it against the exhaust manifold and crank it over, there is no spark.
If the plug is floating, (just dangling from the lead) there is a nice spark.
[Edited on 30/6/24 by ibakes]
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gremlin1234
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| posted on 30/6/24 at 05:56 PM |
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quote:
Originally posted by ibakes
Am I missing something, sorry i should have said I was using a spark light for my tests
If I remove a plug, rest it against the exhaust manifold and crank it over, there is no spark.
If the plug is floating, (just dangling from the lead) there is a nice spark.
[Edited on 30/6/24 by ibakes]
those symptoms are just weird, exactly the opposite from what I would expect,
I can't comment more without knowing more about the spark test device.
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ibakes
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| posted on 30/6/24 at 07:29 PM |
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amazon link
It's one of these. So it tests that the spark is there but not the spark plug
I did actually see that sparks were coming from a lead that was hanging with no plug in to the exhaust manifold
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ibakes
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| posted on 3/7/24 at 10:03 AM |
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Right, I thought I had posted the update but cant see it
anyway, issue was the spark plugs, new ones have been fitted and no issues, car starts fine and sounds great
hopefully get the MOT soon and back on the road
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jacko
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| posted on 3/7/24 at 05:13 PM |
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Glad you found the answer 👍
I once had an problem like this with a grass cutter new plug and hay presto
The answer is start with the easy bits first 😜🫣
555
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