LT1-LT4 Modifications 1993-97 Gen II Small Block V8

At wits end...need help

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Old Jan 19, 2012 | 12:39 PM
  #21  
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Originally Posted by Formula WS6
already been checked. fpr is all good. upon pulling the vac line, when the pressure jumps, fuel trims drop slightly but on both banks to compensate for the higher pressure which is what I'd expect.
Alright, so it sounds like the next step would be to pull the throttle body and see if it has those extra holes you need to block so all of the idle air goes thru the correct port.
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Old Jan 19, 2012 | 12:51 PM
  #22  
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That's actually a very good point cause I was running a Nitrous works plate and switched out to a Nitrous outlet plate prior to this problem appearing. thanks for the suggestion, I'll pull it apart tonight give an update.

fyi it's a PP 58mm tb
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Old Jan 19, 2012 | 12:59 PM
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Have you checked the back intake manifold bolts like mentioned above? I just pulled my intake and was shocked that half the bolts were finger tight.
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Old Jan 19, 2012 | 03:21 PM
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yeah retorqued em last night and they were all fine. 3 were maybe a 1-2lb off cause I got maybe a 2 inch swing on a 20" torque wrench before it clicked. No difference.
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Old Jan 19, 2012 | 05:08 PM
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Originally Posted by Alex94TAGT
Clear as mud now?

lol.. I had a pretty good understanding but that did clarify some questions I had...
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Old Jan 19, 2012 | 05:19 PM
  #26  
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Could the 6 and 8 injector connectors be swapped?
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Old Jan 19, 2012 | 09:47 PM
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At first glance it appears 05HD is the winner.. Lol. I eliminated my nitrous outlet plate and my short term trims dropped to +\- 3% on bank 2 from + 12%. Pulse width dropped to 4.2 ms on bank 2 while 1 was at 3.9 ms. Long term dropped to 7% from 25% but I'm sure the remainder of the fix will be in new oil, plugs and potentially the o2 sensor. I ran the Car for 20 min and I even noticed when I brought the rpm up to a steady 2k, I was getting a lot less popping/ back firing out the exhaust.

Thanks everyone for your help. Now I don't feel Like selling it or throwing a LS in it.lol. I normally don't get frustrated but this was throwing me a curve ball thanks to aftermarket crap. Time to modify the plate and tb
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Old Jan 19, 2012 | 11:59 PM
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So cylinders 2 and 4 were running lean and the O2 sensor picked it up and added fuel to the whole bank which made cylinders 6 and 8 run rich, correct?

Last edited by guppymech; Jan 20, 2012 at 09:32 AM. Reason: grammar
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Old Jan 20, 2012 | 07:58 AM
  #29  
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exactly! This is why I love the LT community. I know Alot when it comes to repairing cars but reasons like this is why I will never claim to know it all.
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Old Jan 20, 2012 | 08:47 AM
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nice....
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Old Jan 20, 2012 | 10:37 AM
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Glad to see everything worked out for you! This is why this forum is a love/hate thing
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Old Jan 20, 2012 | 11:00 AM
  #32  
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Glad someone was aware of the throttle body issue. Its such a bitch, someone should sticky it.
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Old Jan 20, 2012 | 12:31 PM
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Hey, I mentioned the TB issue in post #9!

Not to be petty, but I demand 10% of 05HD's victory winnings, so long as the victory winnings are jelly beans.
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Old Jan 20, 2012 | 02:53 PM
  #34  
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Originally Posted by Formula WS6
At first glance it appears 05HD is the winner.. Lol. I eliminated my nitrous outlet plate and my short term trims dropped to +\- 3% on bank 2 from + 12%. Pulse width dropped to 4.2 ms on bank 2 while 1 was at 3.9 ms. Long term dropped to 7% from 25% but I'm sure the remainder of the fix will be in new oil, plugs and potentially the o2 sensor. I ran the Car for 20 min and I even noticed when I brought the rpm up to a steady 2k, I was getting a lot less popping/ back firing out the exhaust.

Thanks everyone for your help. Now I don't feel Like selling it or throwing a LS in it.lol. I normally don't get frustrated but this was throwing me a curve ball thanks to aftermarket crap. Time to modify the plate and tb
It is always easier to give useful advice when the person with the issue has some know how and provides a good description of what is going on! Also, there is always next week to throw an LS in when the opti starts acting up, lol.



Alex94TAGT- You can have some jelly beans, you typed a lot more than I did.
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Old Jan 20, 2012 | 04:39 PM
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Sorry Alex, I've gotta give credit where it's do. Thank you as well.
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Old Jan 21, 2012 | 06:44 PM
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bout time you figured it out.
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Old Jan 21, 2012 | 07:27 PM
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I have found out many times that there are very knowledgeable people in this forum!!! kudos!
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