LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

1995 ls 400 cranks, but will not start

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Old 08-10-18, 04:33 PM
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bell2018
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Default 1995 ls 400 cranks, but will not start

Battery good, fuel good, fuses good. Remote unlocks doors and trunk. Tried starting fluid, no help. No spark to any of the spark plugs. Is it possible both coils are bad? How do I test coils?
Old 08-10-18, 11:51 PM
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dicer
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Most likely crank position sensor that's my first guess. If you had a scope you could look for the signals.
Also check fuses, like EFI fuse. Relays?
Old 08-11-18, 12:19 AM
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oldskewel
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Your thinking is right regarding the coils. Virtually no chance that both coils have failed. And the coils are fed by their own separate igniters, so similarly unlikely that both of those failed.

So the spark plugs, wires, distributors, coils, and igniters are all probably good.

Look for a single failure upstream of the igniters that would cause loss of ignition on all spark plugs.
Old 08-12-18, 04:17 AM
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blkstealthpaid4
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Default I had the sawm issue on my 95

Originally Posted by bell2018
Battery good, fuel good, fuses good. Remote unlocks doors and trunk. Tried starting fluid, no help. No spark to any of the spark plugs. Is it possible both coils are bad? How do I test coils?
It happened to me on my 95.The crank sensor was my problem.It started with starting fluid but the check engine referred me to the crank sensor.$30 from ebay and I was rolling again.PLEASE COME BACK AND TELL US HOW YOU FIXED IT.WAY TOO MANY PEOPLE DONT.
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