LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

i think i found the problem this time advance tech guys please read

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Old Mar 25, 2005 | 06:59 PM
  #1  
oneslowz28's Avatar
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From: Aiken, Sc
i think i found the problem this time advance tech guys please read

ok ive been on the phone with a friend trouble shooting and we found a major problem the fule injector harness wires are dryrotted and the insulation is falling off well i fixed them with some heat shrink tubing and checked the injector pulse voltage and i came up with some low numbers. here they are. my scan tool was dead so i checked these with a volt meter.
i know these numbers should be alot higher but so the whole car is running lean which seems to be wrong becuse if i floor it in park it will spit out raw gas from the tail pipes. and befor anyone mentions it it is spitting out gas not coolent or oil.

bank---injector number-------idle--------1000---------2000--------3000

left ---------1------------.8v-1.0v----1.1v-1.3v-----1.5v-1.6v---2.5v-2.7v

left----------2 -----------.9v-1.1v----1.1v-1.2v-----1.6v-1.8v---2.3v-2.9v

left----------3-----------.8v-1.0v----1.2v-1.4v-----1.5v-1.9v---2.5v-2.9v

left----------4-----------.8v-1.0v----1.3v-1.5v-----1.7v-1.9v---2.8v-3.0v

--------------------------------------------------------------------------

right---------1------------.5v-.7v----.8v-1.0v-----1.2v-1.3v----1.6v-2.0v

right---------2------------.8v-1.0----1.3v-1.6v----1.8v-2.0v----2.3v-2.8v

right---------3------------.4v-.8v----1.0v-1.1v----1.6v-1.9v----2.0v-2.7v

right---------4-----------1.0v-1.1v---1.5v-1.9v----2.0v-2.2v----2.7v-2.9v
Old Mar 26, 2005 | 12:12 AM
  #2  
Injuneer's Avatar
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From: Hell was full so they sent me to NJ
Re: i think i found the problem this time advance tech guys please read

Are you measuring pulse "voltage" with your voltmeter, and trying somehow to equate that to pulse "width" in milliseconds (what you would see on a scanner.... "width", not "voltage"). Confusing.

And, did you set it for DC voltage? Then, unless you have an incredibly fast volt meter, you are measuring some sort of "average" voltage, that reflects the percent of the time the circuit is supplying +12V to the injectors. And, was this done with the engine under load at 2,000rpm (for example), or did you just run the engine up to 2,000rpm in neutral? Those two methods would yield much different injector pulse widths.

Help me understand what you are trying to do?
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