Mechanics

92 , LS400,, V8 NO SPARK...

1992 Lexus LS 400 • 277,000 miles

Hi Guys, 1992 Lexus, v8, no spark any ideas, not very familiar with the Lexus, not getting spark, any help greatly appreciated, thanks.
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Pearlhickory
October 10, 2012.



They are in distributors. Also check the ignition relay it may have a bad ground goind to it and not allowing power to the coils.

Hmac300
Oct 10, 2012.
Cool, I thought I was missing something here, so behind the distributor, last check I did was for voltage output on the crank, had around 600 milliamps, looks like a good reading, so off I go to distributors and check for bad ground on relay, thanks.

Tiny
Pearlhickory
Oct 10, 2012.
Could be inside the dist too.

Hmac300
Oct 10, 2012.
Ok, I was able to see the driver side sensor, it read 1125 ohms, the passenger side was open circuit, fluctuated a bit then back, to open, and its the one thats worse to get to, havent checked anything else yet, should he be condemned, [ replaced yet or keep looking ] will it start with only one cam sensor working?

Tiny
Pearlhickory
Oct 10, 2012.
It might but would require excessive cranking time. The fluctuation of readings could be due to the probes not getting correct contact and you should reconfirm the testing again.

KHLow2008
Oct 10, 2012.
I found one issue for sure, the passenger side cam sensor lead is split, only one lead is attached, other is cut and looks been like that a while, could it have still been making conductive circuit being very close, the car started sometimes then wouldnt, I had probes in there good, ive worked meters long time, finally wouldnt start anymore, I imagine could also have other issues.

Tiny
Pearlhickory
Oct 10, 2012.
Splice back the wire and test if it works. If you had checked for trouble codes, the cam sensor should have come up.

KHLow2008
Oct 10, 2012.
Will do, im calling it a day, ill splice it up, and repost in morning, thanks a lot for all the help, maybe tomorrow get it running, have a good evening.

Tiny
Pearlhickory
Oct 10, 2012.
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