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#2
12-27-2016, 11:34 AM
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I installed the larger fuel injectors and a fresh set of spark plugs today. Should be going on the chassis dyno for a full tune in about a week or two.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi 
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#3
03-13-2017, 06:37 PM
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After many delays, it is finally getting tuned tomorrow morning. I will post pictures and dyno results when it is all said and done. I am hoping for at least 370 at the tires.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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#4
03-14-2017, 05:00 PM
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Well, things didn't go as planned.
 It has a miss, and something is up with the #7 cylinder. I need to do a compression and leak down test. My father is devastated and wants to get rid of the truck.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi Last edited by carpoor; 03-24-2017 at 07:39 PM.
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#6
03-15-2017, 12:15 PM
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Right now, he is really upset. I am going to keep him busy with other things in the meantime.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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#7
03-24-2017, 07:45 PM
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I took a little time today to pop the valve cover and look for any broken valve springs. Everything looks good. I was suspicious of the plug wire, changed that wire. No real change, still flutters at idle. Next is a compression test, and I want to move the injector from that cylinder to another to see if the miss follows it.
It's tucked away in the garage for now.
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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#8
03-29-2017, 06:22 PM
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Spent more time on it yesterday. I started by swapping the injectors for the #1 and #7 cylinders. Sure enough, the miss moved to the #1 cylinder. I got the engine up to temp and the #1 header tube was over 200 degrees cooler than the other seven cylinders. (Verified with an infrared gun, great tool)
New injector is on the way, should fix that problem.
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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#9
04-01-2017, 05:03 PM
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Got the injector swapped in, and installed two fresh plugs in #1 & #7. It's running much better. All I can say is - this thing is going to wear out back tires at an alarming rate.
It seems that I have traded one problem for another. None of the lights are working. Might be a ground wire that we forgot to reconnect when the bed was off. Going to stick it on the lift Tuesday and start tracing wires.
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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