TJ's Motors built/in (working on KR issues now, update 9-12) - Page 21 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 08-27-2007, 05:20 PM   #201
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As I stated in another thread the knock sensors don't become active until a certain ECT is reached. On some cars this is as high as 150+. You may be getting KR constantly just not getting a reading until the become active. Being lean all over is an indication of a fueling problem whether it be fuel pressure, fuel maps, fuel injectors, etc...
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Old 08-27-2007, 05:24 PM   #202
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I still think the stock fuel maps can't keep up but I would rule out or replace the fuel pump before you start trying to tune on a potentially inadequate fuel system.
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Old 08-27-2007, 05:29 PM   #203
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Quote:
Originally Posted by 95naSTA
I still think the stock fuel maps can't keep up but I would rule out or replace the fuel pump before you start trying to tune on a potentially inadequate fuel system.
VERY sound advice. Always 'tune' mechanically first. Don't mess with that PCM until you KNOW your fuel system is at or above factory spec to begin with.
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Old 08-27-2007, 06:44 PM   #204
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I already have the fuel filter so i think i am going to bite the bullet and just order a stock pump next paycheck (only cost me about 60 dollars). I really should have one with the new mods and everything. Then if that doesnt take care of it then i will start with pcm work.


Side question, I am thinking of going back to the newer style injectors bill got for me. They are just the better spraying ones. I was seeing IPWs of 18 with those all the time. Now with the older style injectors i see 18'* sometimes and 22'* some times so i am going to do that maybe tomorrow.
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Old 08-27-2007, 06:50 PM   #205
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There is no spray pattern difference or any other advantage or disadvantage to either the Rochester or Bosch L36 injectors.
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Old 08-27-2007, 07:03 PM   #206
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ok then, scratch that idea. Maybe it was just the warmer weather causing it i dunno lol
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Old 08-27-2007, 08:15 PM   #207
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Your injectors could be dirty.
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Old 08-27-2007, 08:38 PM   #208
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True. Can anyone reccomend a decent fuel injector cleaner?
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Old 08-27-2007, 09:13 PM   #209
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Sure. Chevron or STP injector cleaner off the shelf.

Or (conjecture here) Toluene, like I suggested to you for a higher octane mix.....with CARE. One of the reasons FIE supposes my OEM fuel injectors were in such good condition was from frequent use of Toluene.

Want the best of both worlds? Run Chevron or STP now, then do a toluene mix the next time you get gas. Back it up with Chevron or STP the following gas-up. Why? One might loosen up what the other can remove. Think about the sequence.
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Old 08-27-2007, 09:36 PM   #210
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Good idea, i will do that.
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