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

bigger injectors or possible bad fuel pump

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Old Aug 19, 2008 | 01:54 PM
  #1  
Untouchable9262's Avatar
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Default bigger injectors or possible bad fuel pump

My car seems to lagg alittle bit in the higher rpms and in 3rd gear n up, seems like im not getting enough fuel, my mods are below, mayb i need bigger injectors with the ported heads and cc306? or possible bad fuel pump is not working right when my car warms up? im gonna check the pressure tonight, wat is it suppose to be at idle and when driving? Any advice?
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Old Aug 19, 2008 | 02:34 PM
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My car does the same, only it's basicly stock? Feels like its cutting out ~5500 + but only in 3rd or higher.

Has new opti/plugs/wires.
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Old Aug 19, 2008 | 03:06 PM
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As far as fuel check.. Turn on key a couple of times to prime system, with key on NOT running 41-47 lbs, and pressure should hold steady. Start engine (applies vacuum) pressure should drop 3-10 lbs. The no vacuum test simulates high throttle that's why pressure s/b higher. Race the engine in neutral and few times and check that it holds. If you can, tape the gauge to your windshield and make sure pressure stays up under heavy loads. Shoebox has the info: ' http://shbox.com/1/4th_gen_tech2.htm...essure_testing '
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Old Aug 19, 2008 | 11:00 PM
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yes very weird 3rd gear n up only, well anywayz if you find out anything let me no, i kno forsure its not electrical as well because every part is brand new, except injectors are stock and used.
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