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Did you degree in the cam? Have you checked your cylinder pressure with a gauge? Good box to check off for your ignition timing.

Also, another thing to consider is the injection timing with the...

*Older ECUs counts in the opposite direction than newer ECUs when referencing start and stop positions. You have completely recalculated the injection timing (including the make-up) to match the...

Thanks for the input "anniversaryss". This pushed me to revisit my thoughts:)

Fixed it! Runs really good and grunts down low too.

Redone injection timing. My math was a little fuzzy, lol. I set the "Boundary" to IVC @ .050 and computed the "Normal" value 2 degrees after...

nothing that should matter (Leaned out Primary table 100 and 95 Kpa)

Any ideas? Im about to leave and will log it again to see if i can reproduce it again.
Thanks!

Hi, Cranked up and left for work today when I noticed that the issue was not there. While I was sitting at the light, temperatures flipped the system to closed loop. Light turns green, short shift to...

85K5Jake, transient is considered to be with-in 400ms from tip in? This happens 2 seconds into a steady load, like climbing a hill.

Any suggested values for the Normal/makeup that is beyond EVC event? I figured the EVC was at "4" or 360 @ 0.050, from what I've read.

I got 6.42 for IVC @ .050 then minus 1.11 (1.11 x 90) to get...

Stock injection timing 5.33/4.25/3.67 cam is 195/191 111LSA

110 LSA 105 Intake CL (IV 7/37 AND EV 50/0 @ 0.050)

88434

Boundary 6.5/Make-up 5.55/normal 5.55

This made it a little lean at idle and had to add fuel but no more tip in lean spot. Ran well but still has lean spike at 2 second mark

Blackwidowvette, Sounds like we are looking at the same thing...Might learn something new:)

Update: changed Injection timing Normal to 4.76 and Make-up to 5.34.

Now there is a lean spike on tip on, lol.

Hi Everyone,

I've gotten a bit stumped on a small issue I'm having and wondered if anyone has some input on this one. Basically, lean spike that happens about 2 seconds after you are in a steady...

Thanks for your input, I need to add a port to check the pressure. (running the marine intake with external injectors and LS fuel filter (return-less system). I was thinking that it would bog more or...

yes, set it to 6K then 10K. Acts like Park/neutral rev limit. I also noticed that the DEFCO was still activating on decel, even though I've set the parameters beyond normal limits??? Crap ECU?

...

Hi Everyone,

I have a 98 4.3L w/Manual transmission that won't rev past 4.5k. Looks like the injectors are being shut off, it switches loop, O2 go lean. Seams complete intentional. Any ideas?
...

OEM but how did you brick it? That ECU is very common.

Hi Guys,

I've been dealing with knock issues as well on a LN2. I found the manual transmission was my issue. It would rattle terribly during off throttle or snapping the throttle open quick,...