Did I limp it? Or a glitch in the Matrix? - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 6 (permalink) Old 08-19-2019, 11:37 PM Thread Starter
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Did I limp it? Or a glitch in the Matrix?

Hey y'all. Long post warning.

So im halfway through my first camper haul through the mountains with my new LLY head swap. 8000lbs max, fairly fresh swap, at around 20k kms on it.

So I'm shootin bull with the wife 5 hours into the 18 hour drive, and I forgot cruise on up a fairly steep, but short grade. Oops.

Downshifted to 4th, felt like it slipped a touch and immediately threw code P1626 and P0700. Also went into sort of a limp mode, but did not display this on the DIC. It said "Shift Range Inhibit".

I pulled over, cleared the codes, restarted the truck and went on my merry way. There is a hill heading west out of Kelowna, BC that's like 25 damn kms of 8% grade. It's crazy. But I just downshifted beforehand and kept er at 2200-2500 rpm and hasn't skipped a beat for the rest of the trip so far. FWIW, I got a high score of only 1354F egt, 225F coolant, and just tickled 210 on trans temp. Fan kicked on and everything cooled as expected.

So I searched for the codes and they don't really go hand in hand with what the dash told me. P1626 comes up with a theft deterrent thing, and maybe NBSU switch. However mine is brand new AC Delco.

Any ideas? Gremlins?

It also seems like a very loud rattle in the 2500+ rpm range. Is that normal? Sounds like noisy valves or something. Obviously sounds normal at idle.


Wish me luck the ride back home haha.

Cheers!




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"Stinky Pig"
2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
Flo-Pro Downpipe
4" Straight pipe
EGR delete
PCV Re-route
EFI Live (E. Stock/30HP/60HP Tow/high idle/No start)
Edge CTS2 with EGT
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post #2 of 6 (permalink) Old 08-20-2019, 08:39 AM
 
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Check your hot side boots tube for the rattle. I've been chasing one for a few weeks and realized that tube was too close to my brake master cylinder and about 2300 rpms it would make contact and rattle. Only did it while driving. Couldn't make it do it sitting the driveway.
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post #3 of 6 (permalink) Old 08-20-2019, 09:42 PM Thread Starter
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Quote:
Originally Posted by Sliverflipper View Post
Check your hot side boots tube for the rattle. I've been chasing one for a few weeks and realized that tube was too close to my brake master cylinder and about 2300 rpms it would make contact and rattle. Only did it while driving. Couldn't make it do it sitting the driveway.
10-4. Will check for that in the morning.
I was thinking some major injector knock, seeing as they have 585k kms on em, but it also does it when turbo braking/zero throttle. So I dunno. Just paranoid I guess.

Thanks

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"Stinky Pig"
2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
Flo-Pro Downpipe
4" Straight pipe
EGR delete
PCV Re-route
EFI Live (E. Stock/30HP/60HP Tow/high idle/No start)
Edge CTS2 with EGT
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post #4 of 6 (permalink) Old 08-21-2019, 04:54 AM
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Rattle could also be the turbo heat shield, up pipe shield, or your front pipe touching something. Also could be the pilot injection kicking off. P1626 is usually a pcm issue. The p0700 is generic trans code just to light the cel. You need a better scanner to pull the actual code

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post #5 of 6 (permalink) Old 08-24-2019, 06:49 PM Thread Starter
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Well, just completed the trip with no other issues.


I'll just chalk this up as a glitch in the matrix until I can get it scanned properly. (Edge CTS2 is what I have)

Still have yet to determine cause of rattle. Could a valve lash come loose? Or backed off? It's kinda what it sounds like. I set everything to .011-.012 and torqued the keepers to spec with a snap on digital wrench.

Last oil analysis came back perfect before the trip.

Cheers.

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"Stinky Pig"
2003 Sierra 2500 Crew 4x4–Charcoal Grey Metallic
325k kms and counting
LLY Head swap
LBZ full intake w/MP
Flo-Pro Downpipe
4" Straight pipe
EGR delete
PCV Re-route
EFI Live (E. Stock/30HP/60HP Tow/high idle/No start)
Edge CTS2 with EGT
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post #6 of 6 (permalink) Old 08-24-2019, 10:29 PM
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You would notice valve lash at idle. Hard to diagnose a sound without actually be8ng there to hear it. A rattle could end up being a bajillion things.

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