Update to my intermittent fuel pump issue... - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 06-17-2019, 12:41 PM Thread Starter
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Update to my intermittent fuel pump issue...

After replacing fuel sending unit, fuel pump, fuel filter, fuel pressure regulator, fuel pump relay, I am still chasing down this electrical issue.

I can get it to run every so ofter for about 5 seconds

When it does not start I do not have spark

I unplugged and replugged every connector under the hood I could find and still no change

I have an appointment at a local shop Wednesday but would love to solve this before that happens. Anyone have any ideas/suggestions?

Matt MF'N Mills 96 Black SS NAISSO Member #6125
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post #2 of 11 (permalink) Old 06-17-2019, 01:07 PM
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No spark - BINGO. You have an ignition problem not a fuel problem if it holds 40 psi.
Start by replacing the coil and ignition module (ICM) as they are easiest.
If problem persists, replace the distributor (opti).

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post #3 of 11 (permalink) Old 06-17-2019, 01:12 PM
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This is just a continuation of the same issue(s) from your other thread. IDGet it. The history and continuity there can only help chase down your problem. If you're asking for just electrical suggestions here, then without going back to that other thread it'll be important to know what electrical diagnosis you've tried so far. As mentioned above the IC, ICM and opti (and grounds) are instant targets.

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post #4 of 11 (permalink) Old 06-17-2019, 02:59 PM Thread Starter
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Ok, we can add Ignition Coil, and Ignition Coil Module to the list. Just changed those out and same situation.

Matt MF'N Mills 96 Black SS NAISSO Member #6125
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post #5 of 11 (permalink) Old 06-17-2019, 05:55 PM Thread Starter
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ANNNNDDDDD......It was the Opti!

Thanks for all the help everyone, shes back on the road!

Matt MF'N Mills 96 Black SS NAISSO Member #6125
Mods: T-56, Suncoast Ram Air Hood, S-Class Mirror LEDs (thats right bitches), Smoothie Bumpers, 50% windshield tint, Train Horns, Clear Corner Lenses, Corvette Engine Dress, 2.5" Custom Exhaust, Carbon Fiber dash, Oil, Volt, and Vac gauges, 3 Gauge Pod, Body Bushing upgrade, T/B bypass, Red Bowtie, LT4 Knock Sensor, F-Body EGR valve & Servo, Moog suspension, A/C drip mod, SEM Blacked out interior, CIA Headers
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post #6 of 11 (permalink) Old 06-18-2019, 12:57 PM
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Can you be more specific? optical sensor was bad? Opti full of oil or coolant? Optical wheel rusted? Opti harness bad?

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post #7 of 11 (permalink) Old 06-18-2019, 07:24 PM Thread Starter
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No visual signs of the opti being bad. Just didnt work. Put a new one on and it worked. Changed the harness at the same time too. But the old harness looked fine though.

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post #8 of 11 (permalink) Old 06-18-2019, 09:57 PM
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Quote:
Originally Posted by Matt M View Post
No visual signs of the opti being bad. Just didnt work. Put a new one on and it worked. Changed the harness at the same time too. But the old harness looked fine though.
What brand opti did you go with?

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post #9 of 11 (permalink) Old 06-19-2019, 07:43 AM Thread Starter
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Quote:
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What brand opti did you go with?
Unfortunately a cheap Autozone Duralast. Was all that was available at the time.

Matt MF'N Mills 96 Black SS NAISSO Member #6125
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post #10 of 11 (permalink) Old 06-19-2019, 07:47 AM
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Autozone opti is ok.
Hopefully you took the cap off and thread locked the rotor screws

Nab
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