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Old 05-05-2017, 08:20 PM   #1
Hotwire
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Bested by a Jimmy, P0300, ltft way negative

See if y'all can figure it out.

Daughter came home from beach with check engine light and engine completely sputtering under load, low power.

Hooked up my scanner, saw bank 1 was -10-13, bank 2 was -18 with stft trying to pull more. First thought, fuel.

Cracked tb, could smell raw fuel. Pulled upper intake, looked like back of intake was washed.
Replaced fpr, no change.
Replace spider injector assy, no change.
Replace coil/ignition module, no change.

No misfire code but can randomly see 1, 2, 3, & 4 show up, but didn't show any history? You can blip the throttle and hear dun-dun-dun-dah and feel it misfiring as rpm catches up to throttle, but steady throttle it's smooth as glass any rpm. When it's burping you can really hear it in the muffler..

Only thing I got left is cat or egr? Egr is showing 0, I can open it and engine tries to die when I hit anything over 25%. All exhaust ports are showing around 350-370° where I cab get to them with infrared..

Just took it down the road with 0 issue, even nailed it and it ran fine, back in driveway it's stuttering.

HALP!!
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00 ZR2 Extended cab (8BenZR2/Angus), 4wd, Beater Extraordinaire
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Quote:
Originally Posted by Teeleton
Hot wiring is bad news.
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Old 05-05-2017, 09:15 PM   #2
mkgearhead
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Mass airflow sensor? Do you have another one to swap in?
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'04 Subaru Forester XT EJ255 turbo, TBE, lowered 1.5" w/springs
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Old 05-05-2017, 09:59 PM   #3
Hotwire
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Most likely, think it may be dirty? I can scan the zr2 and compare..

Preciate the reply!
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•Jeff•
08 Hybrid Tahoe (Tin Foil) 2wd, 6.0, stock and very comfortable
11 Ford Edge (BlackBerry) 2wd V6, Limited, wife's
00 ZR2 Extended cab (8BenZR2/Angus), 4wd, Beater Extraordinaire
98 Habanero 2, 5.3L L33 V8 swap Click for project SOLD
Quote:
Originally Posted by Teeleton
Hot wiring is bad news.
Teeleton
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Old 05-06-2017, 06:48 AM   #4
mkgearhead
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Dirty or oil from K&N filters can skew the readings. I have seen a few just go bad though. Hard to say. Another thing to look for is the distributor shaft bushing. Loose bushing does weird things.
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-Mitch K

'91 Z70 Bravada lowered 4" 350 Vortec w/TBI, TCI-700r4, KYB's, 9C1 cop car steering gear, rear sway bar, yada yada...
'05 Subaru Legacy wagon (wife's daily)
'04 Subaru Forester XT EJ255 turbo, TBE, lowered 1.5" w/springs
'03 Subaru Outback
'92 K3500 4x4 dually dump, 454, 8' plow sander/spreader
'02 K2500HD single cab 6.0 4L80E

To help support this site with a donation click here
My cardomain site
Quote:
"The spirit of resistance to government
is so valuable on certain occasions,
that I wish it to be always kept alive.
It will often be exercised when wrong,
but better so than not to be exercised at all.
I like a little rebellion now and then." -Thomas Jefferson (1743-1826)
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Old 05-06-2017, 09:06 AM   #5
2kwik4u
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I fought and fought a sputtering problem on m old 2.2. Was significantly worse than yours but had similar symptoms. Way more fuel than needed. I went through a ton of options including new injectors and various sensors. Turned out to be a dead short between #2 and #4 injector drivers inside the ECM. Replaced the ECM, had it reflashed at the dealership and all was right again. It's a simple check with a voltmeter to rule that out.
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Old 05-06-2017, 09:35 AM   #6
Hotwire
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Thanks guys, getting ready to go figure this out, random sucks.
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08 Hybrid Tahoe (Tin Foil) 2wd, 6.0, stock and very comfortable
11 Ford Edge (BlackBerry) 2wd V6, Limited, wife's
00 ZR2 Extended cab (8BenZR2/Angus), 4wd, Beater Extraordinaire
98 Habanero 2, 5.3L L33 V8 swap Click for project SOLD
Quote:
Originally Posted by Teeleton
Hot wiring is bad news.
Teeleton
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Old 05-06-2017, 12:32 PM   #7
Hotwire
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Cleaned maf, wasn't really dirty, barely any dirt on q tip, also sprayed with maf cleaner, no change (paper filter). Thoroughly inspected intake while it was apart, it's solid with no rubs, rips, or opens.

Took it down the road, drove ok but ltfts are split by 10, still more negative on bank 2. Pulled dist cap and rotor, little oxidation, cleaned with 220 grit and brakleen/air. Shaft is tight, reinstalled, no change. Replaced o2 on pass side with one on the shelf, no change.

Thought, maybe intake gasket leak? Idling ltft is -4.7, ltft is -14.7+. Out of curiosity I pulled oil fill cap and both ltft go +20. Checking pcv and possibly changing intake gasket.. Dammit..
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•Jeff•
08 Hybrid Tahoe (Tin Foil) 2wd, 6.0, stock and very comfortable
11 Ford Edge (BlackBerry) 2wd V6, Limited, wife's
00 ZR2 Extended cab (8BenZR2/Angus), 4wd, Beater Extraordinaire
98 Habanero 2, 5.3L L33 V8 swap Click for project SOLD
Quote:
Originally Posted by Teeleton
Hot wiring is bad news.
Teeleton
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Old 05-06-2017, 12:42 PM   #8
mkgearhead
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Plugged air filter? lol. How about MAP? Unplugging MAF change anything?
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-Mitch K

'91 Z70 Bravada lowered 4" 350 Vortec w/TBI, TCI-700r4, KYB's, 9C1 cop car steering gear, rear sway bar, yada yada...
'05 Subaru Legacy wagon (wife's daily)
'04 Subaru Forester XT EJ255 turbo, TBE, lowered 1.5" w/springs
'03 Subaru Outback
'92 K3500 4x4 dually dump, 454, 8' plow sander/spreader
'02 K2500HD single cab 6.0 4L80E

To help support this site with a donation click here
My cardomain site
Quote:
"The spirit of resistance to government
is so valuable on certain occasions,
that I wish it to be always kept alive.
It will often be exercised when wrong,
but better so than not to be exercised at all.
I like a little rebellion now and then." -Thomas Jefferson (1743-1826)
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Old 05-07-2017, 06:51 AM   #9
Hotwire
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Thanks Mitch,

Pulled the maf off the air box, ltft dropped 2 points but split remained. Unplugged maf, and nothing happened, no change, no ses, nothing? Replaced the maf and thought things were fixed but just took time for everything to settle. Unplugging the map, put it in open loop and throwing code.

I was seriously set on intake gaskets. The open fill cap change really messed with my head. I pulled the pcv and cleaned it, 90% sure it needs to be replaced. After cleaning it you can hear it rattling for days.

Got to thinking, if I plugged off pcv, I eliminate any reference to crank case. Plugged it, watched ltft, they about swapped sides, then pulled fill cap to see if I could see any change, indicating it was pulling from the intake gasket. No change, dammit.

That's about where I'm at. The low power/stumble is gone but the skip when revving in park is still there. Took it for another drive and the split is now down to 4, no problems to report. Idling, cruising, and acceleration are good, still see ltft split though. I don't have any reference to how it acted before. Boggling my mind. Told her to get an air filter, pcv, and intake gaskets when she has the money and we'll swap them out. Told her to also let me know if it acts up. I'll update, just seems I did enough to hide it for the time being definitely didn't fix anything, but damn it runs a lot better than before.

Now that I have the zr2 back I'm going to datalog and compare, might pull tunes to see if GMC did anything different.
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•Jeff•
08 Hybrid Tahoe (Tin Foil) 2wd, 6.0, stock and very comfortable
11 Ford Edge (BlackBerry) 2wd V6, Limited, wife's
00 ZR2 Extended cab (8BenZR2/Angus), 4wd, Beater Extraordinaire
98 Habanero 2, 5.3L L33 V8 swap Click for project SOLD
Quote:
Originally Posted by Teeleton
Hot wiring is bad news.
Teeleton
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Old 05-07-2017, 10:14 AM   #10
mkgearhead
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I wonder if the fuel pressure regulator was bad washing gas into the oil. You fixed the regulator leak but PCV was still sucking fuel vapors from the oil. Plus unless you can reset fuel trims it may take a while for it to learn. I would think intake gaskets leaking would give you a lean condition, not rich.
__________________
-Mitch K

'91 Z70 Bravada lowered 4" 350 Vortec w/TBI, TCI-700r4, KYB's, 9C1 cop car steering gear, rear sway bar, yada yada...
'05 Subaru Legacy wagon (wife's daily)
'04 Subaru Forester XT EJ255 turbo, TBE, lowered 1.5" w/springs
'03 Subaru Outback
'92 K3500 4x4 dually dump, 454, 8' plow sander/spreader
'02 K2500HD single cab 6.0 4L80E

To help support this site with a donation click here
My cardomain site
Quote:
"The spirit of resistance to government
is so valuable on certain occasions,
that I wish it to be always kept alive.
It will often be exercised when wrong,
but better so than not to be exercised at all.
I like a little rebellion now and then." -Thomas Jefferson (1743-1826)
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