93-02 Engine Tech LT1 and LS1 motor heads unite! |
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07-19-2016, 10:49 PM
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Chief Ponti-yacker
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Join Date: Dec 2013
Location: Mid West
Posts: 656
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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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07-20-2016, 01:39 PM
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Ultimate Warrior
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Join Date: Oct 2004
Posts: 1,733
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Yes Optispark problems can cause that. Worst idea GM ever had.
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"The Mustang's front end is problematic... get yourself a Firebird." - Red Forman
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07-20-2016, 02:15 PM
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Ultimate Warrior
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Join Date: Feb 2004
Location: Oak Leaf, Texas
Posts: 1,925
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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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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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07-20-2016, 10:51 PM
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Chief Ponti-yacker
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Join Date: Dec 2013
Location: Mid West
Posts: 656
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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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07-21-2016, 08:38 AM
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Ultimate Warrior
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Join Date: Feb 2004
Location: Oak Leaf, Texas
Posts: 1,925
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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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07-22-2016, 08:31 AM
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Chief Ponti-yacker
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Join Date: Dec 2013
Location: Mid West
Posts: 656
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Did the new pump and sender fix the gauge sweep?
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07-22-2016, 10:30 AM
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Ultimate Warrior
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Join Date: Jan 2005
Location: Catawba Ohio
Posts: 7,283
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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.
__________________
Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated
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07-24-2016, 05:40 PM
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Ultimate Warrior
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Join Date: Feb 2004
Location: Oak Leaf, Texas
Posts: 1,925
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Quote:
Originally Posted by lugnutx2
Did the new pump and sender fix the gauge sweep?
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The speed of the sweep? Didn't notice. The range? Never let it go below 1/4 tank.
__________________
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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