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Loss of power to injectors 1992 LS400

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Old 06-27-14, 12:06 PM   #1
tfleetwood
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Default Loss of power to injectors 1992 LS400

Working on a 92 LS400. After about 10 minutes of run time, driving or idling, I lose power to the injectors. Fuel pressure is fine (have gauge on it, holding steady at 42). Have spark (sprayed Starting Fluid in intake, tries to start and run until fluid burns off). Using a noid light, I found that I have power to injectors while running, of course. Once engine warms up and dies, no more power to noid light while cranking. After a cooling off period of 30 to 60 minutes, motor starts right back up. Depending on how much it cooled off, it may run for 1 or 2 minutes or a full 10 minutes, but never longer. Have not replaced any parts yet. I prefer going down the road of TEST NOT GUESS. Running cool water on the crank sensor did not help it start sooner.
Please feel free to contact me directly if you have experience with this issue. tfleetwood@aol.com
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Old 06-28-14, 07:02 AM   #2
Yamae
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Did you get any code?
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Old 06-28-14, 12:19 PM   #3
RA40
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We understand the direct contact urgency. We would encourage responders to openly share on the forum their solutions. Others later or years from now can readily see how this situation was taken care of and be helped by the discussion.
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Old 06-28-14, 03:08 PM   #4
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Using cold water to check for thermal failure of the CPS may not be the best way to confirm it is faulty.
Grab a can of aerosol freezer and use that to rapidly cool the sensor.
A hairdryer is useful for the opposite.
As with all faults and as Yamae suggests check the OBDII codes first.
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Old 07-06-14, 09:33 AM   #5
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Default OMG, fixing one issue creates another. : (

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Using cold water to check for thermal failure of the CPS may not be the best way to confirm it is faulty.
Grab a can of aerosol freezer and use that to rapidly cool the sensor.
A hairdryer is useful for the opposite.
As with all faults and as Yamae suggests check the OBDII codes first.
OK, so I decided to try again to read the code(s). Determined that the CEL bulb is burnt out. So I swapped another working bulb with the CEL bulb, put the panel back in, tried to read the codes and found no codes.

I put the crank sensor in ice water after another shut-down, re-installed it, and it started right up!! I was a happy camper. Ordered a new one. Installed it yesterday, July 5th and now it runs so long that I am able to see why she had a new thermostat sitting in the front seat. Overheated in less than 20 minutes. Texted her about that and she decided to let her husband work on that.

When she went to leave (after sundown) she immediately stopped, came back and showed me her NEW PROBLEM. When the car is started, the dash lights come on. When the headlights are turned on, the dashlights turn off. OMG, what next? I am getting afraid to touch anything on this car for fear of causing another problem.

Any thoughts on this? Anyone? Anyone?

Sincerely,
LEXUPHOBIA
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Old 07-06-14, 11:12 AM   #6
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Quote:
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We understand the direct contact urgency. We would encourage responders to openly share on the forum their solutions. Others later or years from now can readily see how this situation was taken care of and be helped by the discussion.
although ur absolutely correct..unfortunately people rarely follow up with any resolve
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Old 07-07-14, 09:57 AM   #7
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No worries, mates. I figured it out. Just a loose nut..... the one behind the wheel. Didn't have a connector quite pushed in all the way. So while I was back in there, I replaced 3 other burnt bulbs for her, And now she's ON THE ROAD AGAIN. : )
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Old 07-07-14, 09:57 AM
 
 
 
 
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