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

1993 car surges under partial throttle?

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Old Mar 1, 2008 | 04:29 PM
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Default 1993 car surges under partial throttle?

Having a weird issue no cel yet, anything under 40%ish throttle it feels like it chugs, or kinda surges not real bad but bad enough to notice... but under WOT its pull smooth and hard all the way to redline no surge at all.... only thing I have noticed is the gas milage is pretty bad, and it smells really rich at idle... what you guys think?
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Old Mar 2, 2008 | 11:50 AM
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What mods are done? How long since tune up and PCV valve replacement, other guess is the EGR valve is sticking open.
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Old Mar 2, 2008 | 11:55 AM
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Fuel injectors
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Old Mar 2, 2008 | 12:19 PM
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100% stock.... has new opti, plugs and wires.... everythign else who knows
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Old Mar 2, 2008 | 12:20 PM
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going to be putting on headers soon and deleting all emissions... so hopefully that will clean up some potential problems....
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Old Mar 2, 2008 | 01:19 PM
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Check the fuel filter. People overlook that so much. Also make sure there isn't any minor vacuum leak somewhere.
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Old Mar 2, 2008 | 03:18 PM
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well the check engine light came on today...... now to figure out how to check it
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Old Mar 3, 2008 | 09:14 AM
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i can guarentee its your injectors.. 80% guarentee lol. take a paper clip and check for the codes.. look it up on shbox.com
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Old Mar 3, 2008 | 02:27 PM
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Originally Posted by 1badzee
i can guarentee its your injectors.. 80% guarentee lol. take a paper clip and check for the codes.. look it up on shbox.com
Probably would've been my last guess, since I'd figure the problem would be vice-versa if it was injectors. Fine under little load, crap out under load (wot). I'd guess O2 sensors since WoT they get turned off.
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Old Mar 3, 2008 | 05:40 PM
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code 26???? flashed twice then paused.. then blinkced 6 times..
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Old Mar 3, 2008 | 05:45 PM
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if its code 26 then that =
Quad-Driver Module (QDM) #1 circuit
applies to:
- AIR pump relay circuit
- EGR solenoid
- EVAP solenoid
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Old Mar 3, 2008 | 05:46 PM
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Originally Posted by 97badass
if its code 26 then that =
Quad-Driver Module (QDM) #1 circuit
applies to:
- AIR pump relay circuit
- EGR solenoid
- EVAP solenoid
+1 to that, just found my OBDI code book for GM, lol.

Check out your EGR valve
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Old Mar 3, 2008 | 05:47 PM
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damn junk they are going in the trash lol
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Old Mar 3, 2008 | 05:49 PM
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Originally Posted by azboostin
damn junk they are going in the trash lol
+1 for that, thats where my emissions are on their way to
they SHOULD already be there, but 2 feet of snow kinda slowed me down on the project
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Old Mar 3, 2008 | 05:49 PM
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heh. jersey would tear me a new ******* if i removed any of my emissions stuff. I wish i could.
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Old Mar 3, 2008 | 06:19 PM
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Originally Posted by Formula350
Probably would've been my last guess, since I'd figure the problem would be vice-versa if it was injectors. Fine under little load, crap out under load (wot). I'd guess O2 sensors since WoT they get turned off.
my **** was choking at partial throttle, but fine at WOT.. fuel pressure was a no no so i changed the injectors and problem went away.. i guess he found his though.. egr
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Old Mar 3, 2008 | 06:27 PM
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I am going to do all the above... thanks guys
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