PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Where is the ground at the back of the passenger's head? (on an LS1)

Thread Tools
 
Search this Thread
 
Old Jul 24, 2009 | 03:46 PM
  #1  
mindreaper's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (1)
 
Joined: Sep 2006
Posts: 328
Likes: 0
From: France
Default Where is the ground at the back of the passenger's head? (on an LS1)

I'm going to install an Innovate LC1 wideband on my 1999 Z28, and in the manual it says it's best to ground the LC1 onto the engine.

Therefore I was planning on grounding it at the back of the passenger's head (this is where the PCM, among other electricals is grounded), but where exactly is that ground? Accessibility there is nightmarish, I've felt the area with my hand and I didn't feel any bolt... so it's probably too far for me to reach. Where is it? If it's so hard to access, how can you possibly attach anything to it? Please help...
Reply
Old Jul 24, 2009 | 04:08 PM
  #2  
shoemike's Avatar
TECH Fanatic
15 Year Member
iTrader: (25)
 
Joined: Dec 2005
Posts: 1,283
Likes: 2
From: Prescott, AZ
Default

The PCM ground is on the driver's side.
The tapped holes on the front of the cylinder heads
are also on the back of the cylinder heads and in the same places. (mirror image)
Reply
Old Jul 26, 2009 | 01:34 PM
  #3  
mindreaper's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (1)
 
Joined: Sep 2006
Posts: 328
Likes: 0
From: France
Default

Thanks
Reply
Old Jul 27, 2009 | 12:57 PM
  #4  
mindreaper's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (1)
 
Joined: Sep 2006
Posts: 328
Likes: 0
From: France
Default

Here's a photo of the back of an LS1 (it's not mine, I found this photo on the net). Please look at it and confirm to me that what I've circled in green are good grounding locations? If they are, I guess I'm gonna need to buy a screw... does any know what size? (looks like 10mm, could be wrong... I don't have my car here with me to check). Also, can I ground my LC1 on either side (drivers or passengers side) or is there one that's better?

Reply
Old Jul 27, 2009 | 03:31 PM
  #5  
shoemike's Avatar
TECH Fanatic
15 Year Member
iTrader: (25)
 
Joined: Dec 2005
Posts: 1,283
Likes: 2
From: Prescott, AZ
Default

Either of those is fine.
Reply
Old Jul 28, 2009 | 02:46 PM
  #6  
mindreaper's Avatar
Thread Starter
TECH Apprentice
15 Year Member
iTrader: (1)
 
Joined: Sep 2006
Posts: 328
Likes: 0
From: France
Default

Originally Posted by shoemike
Either of those is fine.
Thanks, good to know.
Reply
Old Jul 30, 2009 | 01:10 PM
  #7  
Mike454SS's Avatar
TECH Addict
20 Year Member
Photogenic
iTrader: (4)
 
Joined: Oct 2004
Posts: 2,142
Likes: 9
From: South Windsor, CT
Default

You can probably see it from below the car...maybe with a mirror.
Reply




All times are GMT -5. The time now is 03:19 AM.

story-0
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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