What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[iamdub]

I have not ran the engine for a 4 days is it normal to make like a valve slap noise? it only did it for a few seconds or is it a sign that the engine is going out

well i did not have it on for several days 4-5 days so i'm sure all the oil drained out it has not done it since

My guess is a dry lifter. Mine sits for a week or two most times and I had a lifter that would tick at that first startup. For the past year, I've been holding the throttle pedal to the floor and cranking the engine for about 20 seconds (two 10-second sessions with a minute rest in between) to build a little oil pressure before starting. This significantly reduced the severity and length of time it would tick. I'm currently replacing all of the lifters and a bunch of other stuff.

If it always does this after sitting for a few days, either start the engine every day or every other day or prime it before cranking.

Isn't that the infamous piston slap people talk about?

Piston slap would happen all the time after a cold start and not just after it has sat for four days.

 

[BG1988]

My guess is a dry lifter. Mine sits for a week or two most times and I had a lifter that would tick at that first startup. For the past year, I've been holding the throttle pedal to the floor and cranking the engine for about 20 seconds (two 10-second sessions with a minute rest in between) to build a little oil pressure before starting. This significantly reduced the severity and length of time it would tick. I'm currently replacing all of the lifters and a bunch of other stuff.

If it always does this after sitting for a few days, either start the engine every day or every other day or prime it before cranking.




Piston slap would happen all the time after a cold start and not just after it has sat for four days.

it only did it that one time since I bought it

the last 20 starts were not an issue ( 6 key turn starts 14 auto stops)
2 cold starts
the cold start PSI it pretty high about 60PSI even though it was 90F I expect it to be less as it's prewarmed up from being warm outside


it did not misfire when it happened

 

[89Suburban]

Cleaned it

Can you tell us about those headlights?

 

[Sam Harris]

Can you tell us about those headlights?

Love those. Wish they made them for my NBS.. but still not sure I’d spend the dough on them...

https://alpharexusa.com

 

[89Suburban]

Love those. Wish they made them for my NBS.. but still not sure I’d spend the dough on them...

https://alpharexusa.com

********!!!! $$$$$$

 

[Geoffsfas10]

********!!!! $$$$$$

Most LED aftermarket replacements are that price or higher. Retrofits are about half that if you do it yourself. Expect that same price for a shop to do them

 

[1BADI5]

Dyno tune........... 312rwhp (stock heads and VVT cam)

The numbers are low, but damn its fun to drive.

 

[PG01]

Oh yeah I forgots... had to get a new gas cap ... it no more clicky clicky...and before some stupid chick ***** light came on i amazoned..

 

[Doubeleive]

Oh yeah I forgots... had to get a new gas cap ... it no more clicky clicky...and before some stupid chick ***** light came on i amazoned..View attachment 246921

why ya wearing a sweater? it's not winter time

 

[PG01]

why ya wearing a sweater? it's not winter time

Actually that was back in February... thats why i said i forgots