First datalog 95 Impala - Chevy Impala SS Forum
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post #1 of 19 (permalink) Old 06-19-2019, 02:25 AM Thread Starter
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Hey guys just wanted to share what happened on my first datalog. Eventually when the car got up to temp it didn't want to idle normal I'd say it would stumble like it was gonna collapse but didn't. I noticed even starting the car it would idle pretty low around 600 and just getting into 550 rpm, it was normal idle for me but that is low I'd think (It's all stock except K&N and MSD Opti+coil). Now with the amazing EEHack program it told me it was ERR44 Left 02 Sensor Lean so I think I'll do the cylinder test on EEHack tomorrow. But my knock count was ridiculously high north of 6000 sometimes. There was no Knock Retard at all, and my Adv. Went up to 41 at one point on the highway so I would like to hear from anyone with thoughts thank you.

Cade

Last edited by cadejohnson58; 06-19-2019 at 02:28 AM.
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post #2 of 19 (permalink) Old 06-19-2019, 06:47 AM
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The picture's aren't showing up for me please let me know

Two browsers; no pics whether signed in or not.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, wait for it... LT-4 knock module!
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post #3 of 19 (permalink) Old 06-19-2019, 07:00 AM
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The pics aren't loading for me either; and strangely I went to another thread and those pics loaded just fine; but not these.

First, CONGRATS on using eehack! The learning curve is steep but you're about to become a master LT1 mechanic.

One by one:
Knock count is just a counter that always starts at some random number; ignore whatever number it's at, the important thing is that it's not increasing. When it increases, that's when knock is happening.

Idle stumble: do you have stock injectors? How many miles on the car? Try turning on the AC and the headlights and see if the idle stumble goes away. If it does, one or more injectors can't handle the really short pulsewidths at idle with no load (take a look in eehack, they're probably 1.1 ms or so?) Your injectors either need to be cleaned or they're just junk. Stock LT1 injectors are not ethanol resistant and should be thrown in the garbage. You can certainly run fuel system cleaner through it. Walmart sells a big bottle of it cheaper than I've seen anywhere else, though I don't know how good it is relative to something like Chevron Techron.

Code 44: unless your exhaust manifolds have NO LEAKS and your AIR pump system is fully sealed off, O2 sensor lean/rich codes are just symptoms. The stumble at idle, if its an injector not opening due to really low pulsewidths, it's the injector, not the O2 sensor, that's causing that code. If you are still running stock exhaust manifolds (and that's not a bad thing), strongly consider removing them as soon as possible and having them planed flat at a machine shop. This will eliminate broken bolt problems for good.

Spark advance: what's the MAP reading when it was at 41 degrees? If the MAP is really low, that's why. Don't worry about it.

"The unexamined life is not worth living." - Socrates
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post #4 of 19 (permalink) Old 06-19-2019, 07:09 AM
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CJ, I can see three pics but they are so small I can't read what your printout reads. Even with new eye glasses. It really wouldn't matter as I would not know what I was reading. Let's hope someone here can see & understand what you have going on.

Mark: Snowman-33

93 9C1: Work & Cubic Ca$h This started with a new headlight and fender Celeritas In Conficiendo
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post #5 of 19 (permalink) Old 06-19-2019, 07:15 AM Thread Starter
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CJ, I can see three pics but they are so small I can't read what your printout reads. Even with new eye glasses. It really wouldn't matter as I would not know what I was reading.[IMG class=inlineimg]/vBulletin/images/ImpalaSSforum_2016/smilies/tango_face_crying.png[/IMG] Let's hope someone here can see & understand what you have going on.

Mark: Snowman-33
Haha they all say successful and I can see them but it won't let me see it in regular view where we can zoom in and scan and with the laptop screen waves it does not help I will keep trying to get the pictures up
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post #6 of 19 (permalink) Old 06-19-2019, 07:52 AM
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..... I will keep trying to get the pictures up

This type issue, combined with the unworkably low rez limits for direct copy on this forum, make this my automatic go-to;


IMGUR


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\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, wait for it... LT-4 knock module!
96 Black is online now  
post #7 of 19 (permalink) Old 06-19-2019, 07:52 AM
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..... [snips]

First, CONGRATS on using eehack! The learning curve is steep but you're about to become a master LT1 mechanic.

..... Your injectors either need to be cleaned or they're just junk. Stock LT1 injectors are not ethanol resistant and should be thrown in the garbage. You can certainly run fuel system cleaner through it. Walmart sells a big bottle of it cheaper than I've seen anywhere else, though I don't know how good it is relative to something like Chevron Techron.



Code 44: ...... If you are still running stock exhaust manifolds (and that's not a bad thing), strongly consider removing them as soon as possible and having them planed flat at a machine shop. This will eliminate broken bolt problems for good.

......

Just to add that in a past life I considered injector cleaners as no more than snake oil. But, wife's SUV took to such instant cure with periodic CEL that I'm won over. Search showed Techron as most effective, and it boils down to the same ROI v. more quantity with 'The big cheap bottle' of SuperTech.



The out-of-plane manifolds caught my eye. First ever hearing this. I always figured the broke bolts are from factory over-tightening or bound-up spacers.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, wait for it... LT-4 knock module!
96 Black is online now  
post #8 of 19 (permalink) Old 06-19-2019, 08:07 AM Thread Starter
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I do have stock injectors which could be shot being so old and if they're not resistent to Ethanol which I didn't know, probably could be a suspect. About 138,000 miles, I got it at 120k. I'll try the A/C and headlight trick thank you. So Inj. Pulse width was left bank 7.28 and right bank 8.01 and O2 was left bank 648 mv and right was 120 mv at highway speed of 74 mph at 2253 RPM this is in the 1 of 3 pictures. Now for the MAP sensor say's at 38 degrees (the 41 degree's I didn't take a pic of but it's on the computer) 74.9 kpa. There are no exhaust leak's from the stock manifold's and my A.i.r pump is gone and manifold capped off. I actually had to cut off my two magnaflow muffler's which not sure when last owner's installed them but on both tubing of both muffler's they rusted through and can move them make them rattle (found my rattle and exhaust leak putter) but on some there was a clean plasma cutter circle around the tubing connecting the muffler which was weird to me so I'm waiting for new muffler's from spintech. I cut exhaust right where the two muffler's sit do you think that would set something wild? I've heard of not having O2 leaks anywhere near before or 12 inches after so just wondering. Thank you for your input and yes I'm absolutely willing to learn the curve and keep the LT1 it's done me good so I can't change it it's a great tame street car and for it's size it's very strong down low for stock everything.
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post #9 of 19 (permalink) Old 06-19-2019, 08:09 AM
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I will keep trying to get the pictures up
Maybe See-Alice....

Mark: Snowman-33

93 9C1: Work & Cubic Ca$h This started with a new headlight and fender Celeritas In Conficiendo
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post #10 of 19 (permalink) Old 06-19-2019, 08:09 AM Thread Starter
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https://i.imgur.com/muypKNx.jpg

https://i.imgur.com/qyCJGZs.jpg

https://i.imgur.com/1gS0Olx.jpg

96 Black for the Win!

Last edited by cadejohnson58; 06-19-2019 at 08:12 AM.
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