Out of ideas
07-08-2006, 07:52 PM
#1
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Out of ideas
This all pertains to a 1993 LT1 freshly rebuilt - With optispark upgrade
Just rebuild the engine - Stock setup of Fuel injection , Stock computer, 95+ optispark, and PCM for LESS chip.
Problem:
Car has no power and catalytic converter glowing red and smells funny.
Question:
In Old School distributors moving +/- 5 - 10 degrees would not allow engine to run. We know that when we put the timing chain in we lined up the marks at 6 and 12 oclock. Our question is the following
Could the computer have the engine run SOMEWHAT correctly if we did not have the #1 piston at TDC when the optispark was installed - in other words 180 degrees off.
Also another clue -
At idle the engine almost stalls and then picks itself up.
NEW FUEL PUMP ( 255 Walbro) New Injectors ( 30# Accels - ALL SPRAYING - tested) New fuel filter , stock 1993 regulator.
Please Advise.
Just rebuild the engine - Stock setup of Fuel injection , Stock computer, 95+ optispark, and PCM for LESS chip.
Problem:
Car has no power and catalytic converter glowing red and smells funny.
Question:
In Old School distributors moving +/- 5 - 10 degrees would not allow engine to run. We know that when we put the timing chain in we lined up the marks at 6 and 12 oclock. Our question is the following
Could the computer have the engine run SOMEWHAT correctly if we did not have the #1 piston at TDC when the optispark was installed - in other words 180 degrees off.
Also another clue -
At idle the engine almost stalls and then picks itself up.
NEW FUEL PUMP ( 255 Walbro) New Injectors ( 30# Accels - ALL SPRAYING - tested) New fuel filter , stock 1993 regulator.
Please Advise.
07-08-2006, 07:54 PM
#2
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Join Date: Aug 2002
Location: Melvindale, MI, US
Posts: 4,677
Re: Out of ideas
if the dowel is in the correct slot, it doesn't matter where the engine was
http://shbox.com/1/opti_back.jpg
what cam?
did you check dowel length?
http://shbox.com/1/opti_back.jpg
what cam?
did you check dowel length?
Last edited by Dave89IROC; 07-08-2006 at 07:56 PM.
07-08-2006, 08:18 PM
#4
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Location: Melvindale, MI, US
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Re: Out of ideas
Originally Posted by tritonium
There was only one slot the opti could have fit into
But thanks for the reply
But thanks for the reply
07-08-2006, 09:10 PM
#5
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Posts: 283
Re: Out of ideas
one thing you might want to check also, I have a 93' and I put in a walbro w/30 lb. accel injectors. and on the stock fuel pressure regulator, it was getting too much fuel, about 55lbs. at idle, you prob going to need a afpr to turn the fuel down... and for the cat glowing, could it be clogged?
07-08-2006, 10:22 PM
#6
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Re: Out of ideas
Originally Posted by Dave89IROC
if the dowel is in the correct slot, it doesn't matter where the engine was
http://shbox.com/1/opti_back.jpg
what cam?
did you check dowel length?
http://shbox.com/1/opti_back.jpg
what cam?
did you check dowel length?
CC305
and
Yes we had trimmed the pin to the proper length.
07-08-2006, 10:23 PM
#7
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Re: Out of ideas
Originally Posted by Dave89IROC
well, you asked if it would run if it was installed with the engine not at TDC, and the answer is, if installed correctly, it doesn't matter where the engine was..................
07-08-2006, 10:24 PM
#8
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Re: Out of ideas
Originally Posted by 93yellowta
one thing you might want to check also, I have a 93' and I put in a walbro w/30 lb. accel injectors. and on the stock fuel pressure regulator, it was getting too much fuel, about 55lbs. at idle, you prob going to need a afpr to turn the fuel down... and for the cat glowing, could it be clogged?
I will try this - thank you
But then how can i tell if it is Rich or Lean...
07-08-2006, 10:45 PM
#9
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Location: Iowa
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Re: Out of ideas
Pull a couple plugs to see their burn color. White is lean/black is rich. I've seen the cats glow when dumping too much fuel into the exhaust system causing after-burn. Didn't have the car torn down long without the exhaust lead pipes plugged did you? I've had a mouse to nest in exhaust before? That one had me fooled for days.
Good luck.
Good luck.
07-08-2006, 10:58 PM
#10
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Re: Out of ideas
Originally Posted by gota406
Pull a couple plugs to see their burn color. White is lean/black is rich. I've seen the cats glow when dumping too much fuel into the exhaust system causing after-burn. Didn't have the car torn down long without the exhaust lead pipes plugged did you? I've had a mouse to nest in exhaust before? That one had me fooled for days.
Good luck.
Good luck.
I will look at the plugs - it would be great if this was about afterburn then all id need would ne a new regulator and set it to stock PSI which is what 44psi believe? I did have the exhaust system hanging for a while and that would be awful if a mouse decided to make that their home... poor little booger...
07-08-2006, 11:30 PM
#13
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Re: Out of ideas
Originally Posted by tritonium
I dont think so because i get great throttle exhaust gas response.
Take the cat off and gut it with a bar and see. Bet it ain't completely open and if it rattles is time for a new one or removal.
07-09-2006, 10:48 AM
#15
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Re: Out of ideas
Originally Posted by blitzer454
What's your fuel pressure?
You may just need to adjust your PCM tune for the CC305 cam.
You may just need to adjust your PCM tune for the CC305 cam.
I was thinking about that - however it was sent out to PCM for less and Alvins's reputation tells me it was done right.
I'm going out now to buy a gauge to test the fuel PSI