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93-02 Engine Tech LT1 and LS1 motor heads unite!

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  #1  
Old 07-19-2016, 10:49 PM
lugnutx2 lugnutx2 is offline
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Default Is this an opti spark symptom?

Lately my 94 T/A has been taking an extra couple of seconds to fire up. I started it last week and it died in the garage and wouldn't restart. Today it started right up. I discovered that the previous owner replaced the water pump and then the computer, so he must of had some problems, but failed to tell me at the time of the sale. I'm sure he got the opti unit wet when changing out the pump. Will a bad opti run sometimes and then leave you sitting the next, or do they die and not restart? I have no experience with this setup.
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Old 07-20-2016, 01:39 PM
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amcmike amcmike is offline
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Yes Optispark problems can cause that. Worst idea GM ever had.
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Old 07-20-2016, 02:15 PM
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quicksilver97ta quicksilver97ta is offline
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Well everything get blamed on the opti on an lt1 car, and while it could be, I would absolutely check your fuel pressure before buying any parts. Your symptom sound more like that for a first suspect.
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Old 07-20-2016, 10:51 PM
lugnutx2 lugnutx2 is offline
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I'm not to wild about spending $500 for an MSD opti, so I'll sure check the pressure first.The fuel gauge reads slow, so maybe there is something going on in the tank? This car sat indoors for years and was seldom driven.
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Old 07-21-2016, 08:38 AM
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quicksilver97ta quicksilver97ta is offline
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I remember my gauge sweep was maybe a little slow but more importantly I have run out of gas when the needle was a hair above the E line. My pump died with 60k something miles so it happens.
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68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph
70 Lemans, 350/350, A/C, mostly stock
14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd
97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold***
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Old 07-22-2016, 08:31 AM
lugnutx2 lugnutx2 is offline
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Did the new pump and sender fix the gauge sweep?
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Old 07-22-2016, 10:30 AM
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Sirrotica Sirrotica is offline
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My 97 T/A also ran out of gas when it was still indicating 1/8-1/4tank.

I had a random problem with the engine laying down and barely running intermittently, then it would straighten out and run fine. However the car caught fire under the hood due to a leaking fuel line before I solved the intermittent problem.
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Old 07-24-2016, 05:40 PM
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Quote:
Originally Posted by lugnutx2 View Post
Did the new pump and sender fix the gauge sweep?
The speed of the sweep? Didn't notice. The range? Never let it go below 1/4 tank.
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68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph
70 Lemans, 350/350, A/C, mostly stock
14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd
97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold***
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