PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Sensor problem

Old Jan 1, 2021 | 05:54 PM
  #1  
random-strike's Avatar
Thread Starter
Launching!
 
Joined: Dec 2006
Posts: 242
Likes: 32
Default Sensor problem

Hey, I can't tell what is wrong my ls1 runs like crap. The o2 went bad. I bought some cheap ones and they both stay at .5v and never move and eventually throws codes.

What is fucked up is that even when I change tune to force closed loop it still idles like crap. It runs fine driving and acceleration is fine even part throttle but it won't idle right
When I unplug the maf it runs smooth but idles really high. I cleaned maf and I also have a backup maf and it does same thing with both of them.


Reply
Old Jan 1, 2021 | 06:01 PM
  #2  
G Atsma's Avatar
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
Default

Closed loop is WITH O2's working. To leave them out you need OPEN loop.
Reply
Old Jan 1, 2021 | 06:09 PM
  #3  
random-strike's Avatar
Thread Starter
Launching!
 
Joined: Dec 2006
Posts: 242
Likes: 32
Default

Originally Posted by G Atsma
Closed loop is WITH O2's working. To leave them out you need OPEN loop.
yah I always get it backwards thank you

Last edited by random-strike; Jan 1, 2021 at 08:26 PM.
Reply
Old Jan 3, 2021 | 02:02 PM
  #4  
random-strike's Avatar
Thread Starter
Launching!
 
Joined: Dec 2006
Posts: 242
Likes: 32
Default

When I removed the emissions crap I put some vacuum caps on the TB one of them came off

That's why it wouldn't run even in open loop
When I was scanning I noticed the iac wasn't doing anything so I bought another one and reset the tps and iac
How long before it learns the damn idle??? If I set the iac with hpt it idles smooth as glass
Reply
Old Jan 3, 2021 | 02:45 PM
  #5  
random-strike's Avatar
Thread Starter
Launching!
 
Joined: Dec 2006
Posts: 242
Likes: 32
Default

It idles fine and smooth in gear. But in N or P is bounces around

Sometimes it'll sit at close to desired rpm then start bouncing again


Very annoying
Reply
Old Jan 3, 2021 | 02:49 PM
  #6  
random-strike's Avatar
Thread Starter
Launching!
 
Joined: Dec 2006
Posts: 242
Likes: 32
Default

Maybe it figured something out the idle is only bouncing about 50 rpms now
iac only moving a couple in each direction.

Ok as I'm typing this is started bouncing again wtf
Reply
Old Feb 8, 2021 | 03:51 PM
  #7  
random-strike's Avatar
Thread Starter
Launching!
 
Joined: Dec 2006
Posts: 242
Likes: 32
Default

idle never would be smooth with the new iac.

i put the old one back in and it works fine, took other one back to parts store
Reply


Thread Tools
Search this Thread

All times are GMT -5. The time now is 10:01 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE