Thinking v2
GM Tech, Shop Supervisor
Joined: Mar 2024
Posts: 86
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From: California
Deleted this the first time...not sure how. DOH!
Anyway the old 98, purchased new...it was part of the family for quite awhile..sold earlier this year..it needed a body swap.
It's pretty much identical to the 99 under there though except for the cross over on the intake.....Iac is actually pegged against FW like yours and #8 inj is back there as well. In 98 the IAC and injector used ident harness connectors and they would reach each other lol. That one stumped me for awhile one time.
Btw, - there looks to be more room in the engine comp with the hood is removed...just an illusion. The photo also gives that impression. Don't know why but yeah ...it's tight by the firewall there in the same spots.
___________________
In short...W/the your EV6 injectors there, tall skinny #19 lb Design 3 Bosch (they use to be referred to Bosch design 3's) were superior AFA atomization compared to the original fatties...but were lacking compared to the short 4/5 hole fatties on the market today.
Anyway the old 98, purchased new...it was part of the family for quite awhile..sold earlier this year..it needed a body swap.
It's pretty much identical to the 99 under there though except for the cross over on the intake.....Iac is actually pegged against FW like yours and #8 inj is back there as well. In 98 the IAC and injector used ident harness connectors and they would reach each other lol. That one stumped me for awhile one time.
Btw, - there looks to be more room in the engine comp with the hood is removed...just an illusion. The photo also gives that impression. Don't know why but yeah ...it's tight by the firewall there in the same spots.
___________________
In short...W/the your EV6 injectors there, tall skinny #19 lb Design 3 Bosch (they use to be referred to Bosch design 3's) were superior AFA atomization compared to the original fatties...but were lacking compared to the short 4/5 hole fatties on the market today.
EDIT: What's the part number for the 5 hole injectors with the EV1 Conector I've read a ton of posts you've done about Jbrew? I'm willing to try them all and see what the truck likes best because I'm running a bit lean on the 18.4lb Bosch fatties (which are OEM on my 99 according to Injector Planets specifications by part number). They just arent cutting it with a 75mm throttle body, GOT's mod and even a richer tune with my Superchips Programmer. That's right, 18lbs... maybe it's California Emission.
Last edited by JP Hayes; Oct 29, 2024 at 02:34 PM.
Senior Member
Joined: Oct 2017
Posts: 1,728
Likes: 440
From: CA near Frisco
... because I'm running a bit lean on the 18.4lb Bosch fatties (which are OEM on my 99 according to Injector Planets specifications by part number). They just arent cutting it with a 75mm throttle body, GOT's mod and even a richer tune with my Superchips Programmer. That's right, 18lbs... maybe it's California Emission.
I thiMk my '01 5.4, (most probably, CA,) has 17.X lb.
3.01:1 equiv rear, LS. V light loading. Works well. Spins rears if any moisture in the road and I punch it.
Looking to learn.
EDIT: Presumably, the MAF adjusts for your Gott's Mod, that would lean it a tad in an earlier engine.
Last edited by BillSF9c; Oct 29, 2024 at 05:04 PM.
GM Tech, Shop Supervisor
Joined: Mar 2024
Posts: 86
Likes: 38
From: California
Lean, according to, oxygen sensors? Plug reads?
I thiMk my '01 5.4, (most probably, CA,) has 17.X lb.
3.01:1 equiv rear, LS. V light loading. Works well. Spins rears if any moisture in the road and I punch it.
Looking to learn.
EDIT: Presumably, the MAF adjusts for your Gott's Mod, that would lean it a tad in an earlier engine.
I thiMk my '01 5.4, (most probably, CA,) has 17.X lb.
3.01:1 equiv rear, LS. V light loading. Works well. Spins rears if any moisture in the road and I punch it.
Looking to learn.
EDIT: Presumably, the MAF adjusts for your Gott's Mod, that would lean it a tad in an earlier engine.
Senior Member
Joined: Oct 2017
Posts: 1,728
Likes: 440
From: CA near Frisco
Throwing P1131... gonna log the live date, monitor the O2's then go from there. I already have EV6 Injectors to throw in but I'd rather diagnose this first. I hope it's not a fuel pump, I'd rather not drop the tank... gonna check for vacuum leaks too. Wish me luck, there's so many possible causes for this code I've gotta start with data logging and live data.
Last edited by BillSF9c; Oct 29, 2024 at 05:32 PM.
Senior Member
Joined: Dec 2015
Posts: 23,191
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From: Utah
The Gotts mod isn't going to lean it out. The MAF's job is to measure the amount/speed of the incoming air and compensate for the changes presented to it by the Gott's mod.
Have you taken the MAF out and cleaned it?
Have you taken the MAF out and cleaned it?
GM Tech, Shop Supervisor
Joined: Mar 2024
Posts: 86
Likes: 38
From: California
The Gotts mod isn't going to lean it out. The MAF's job is to measure the amount/speed of the incoming air and compensate for the changes presented to it by the Gott's mod.
Have you taken the MAF out and cleaned it?
https://youtu.be/W0FhiBsIgfI
Have you taken the MAF out and cleaned it?
https://youtu.be/W0FhiBsIgfI
There was one time the truck stalled, and I didn't have any tools... so I shook the air box and it fired right up. I'm gonna test the pigtail harness that's about 1ft long. Might just preemptively replace it with a harness from RockAuto.
Note: Live Data looks good though wasn't able to retrieve short term fuel trims for some reason. Bank 1 was a little slow to level out and nothing concerning except a PCM communication code that's likely due to the recent issue with the battery terminals corrosion causing a voltage drop.
Last edited by JP Hayes; Oct 29, 2024 at 08:11 PM.
Senior Member
Joined: Oct 2017
Posts: 1,728
Likes: 440
From: CA near Frisco
The Gotts mod isn't going to lean it out. The MAF's job is to measure the amount/speed of the incoming air and compensate for the changes presented to it by the Gott's mod.
< Right....
Have you taken the MAF out and cleaned it?
https://youtu.be/W0FhiBsIgfI
< Right....
Have you taken the MAF out and cleaned it?
https://youtu.be/W0FhiBsIgfI
EDIT: A Gott's Mod would potentially lean out an older carbed vehicle, but increased air should also suck more gas in those,evening out most of the effect, I'd think.
Last edited by BillSF9c; Oct 30, 2024 at 12:33 AM.
GM Tech, Shop Supervisor
Joined: Mar 2024
Posts: 86
Likes: 38
From: California
I think I was thinking about that, backwards... That a soiled MAF would enrichen. No I think it would lean it out. But it's cleaning is sorta an annual service. It would be an odd oversight. A dirty MAF would report less air, and lower fuel flow.
EDIT: A Gott's Mod would potentially lean out an older carbed vehicle, but increased air should also suck more gas in those,evening out most of the effect, I'd think.
EDIT: A Gott's Mod would potentially lean out an older carbed vehicle, but increased air should also suck more gas in those,evening out most of the effect, I'd think.