Startup issues

[R467X]

Hello all. I have a 2011 suburban 1500 LT 4x4 with an issue that has me fooled and I'm reaching out because I can't figure it out, but I have an idea.

So I have about 268k. Engine and tranny aren't original. Both were replaced around 150k each.

About 1000 miles ago, I did an AFM / VVT delete in my driveway. Used quality non performance parts. No issues. No leaks. Everything is working fine.

However, last time I filled up my tank, I used the Redline fuel system cleaner which I've used over the last 8-9 years, every 6 months.

The day after,.I developed a start up issue. Specifically, my suburban just takes longer to start, maybe even a slight hesitation but when it starts it's strong. I estimate about 3 seconds longer than what I'm used to.

Here's the kicker, when I use remote start in the morning instead of manual turn the key , everything starts up normally like I'm used to.

The startup issue is only there on cold start sitting overnight. Otherwise starts right up.

I'm thinking bad gas. Any other ideas?

I did test my battery (have a special tester at home) battery is good., I do have an Xtool D8BT I ran diagnostics. No codes.

My starter is about a year and a half old. AC Delco gold.

 

[BattleTank]

Is it a slow crank or just cranks for a long time before catching?

 

[R467X]

Is it a slow crank or just cranks for a long time before catching?

Crank sounds normal. Just takes seconds longer than I'm used to

 

[mikez71]

I wonder if it has anything to do with the VATS. Since it doesn't do it with the remote start.

 

[R467X]

I wonder if it has anything to do with the VATS. Since it doesn't do it with the remote start

That entire system crapped out on me back in 2016ish. spent 3 weeks at the dealer . They replaced my entire fuse box And ignition.

Any idea which fuse or relay I should be looking at for this specific problem? They're cheap enough to replace and old enough that it's not going to be such a waste if I throw a few new fuses in

 

[BattleTank]

VATS only disables starter or fuel?

If it takes a tad longer during cranking, me thinks IAC or if DBW, throttle not opening enough.
Thoughts?

 

[BattleTank]

If remote start works fine, try this when you know when it will do it.

Key it on, wait a sec, key off, then key on then start. Anything different?
I wonder with remote start, it waits after power on then starts. Some are programmed to wait a second longer to allow fuel pressure to come up. You may be attempting to start the second you turn the key on.

 

[R467X]

I'll try that. Every time I start it I always roll the key to the position where all the electronics / lights come on and wait 2-3 secs before actually starting. Haven't tried cycling it though. Will give it a shot tomorrow

 

[mikez71]

VATS only disables starter or fuel?

According to Rick's free auto advice, just fuel.

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Sorry I don't know any specifics..

 

[BattleTank]

LOL, I know 95 and older, VATS kills fuel, 96 and newer it killed the starter, but how far past 96 I'm not familiar with.