PCM ground cable bolt
Thread Starter
TECH Resident
Joined: Jul 2009
Posts: 772
Likes: 0
From: Bahrain
PCM ground cable bolt Anyone know the size of this bolt? I looked up Shoebox but could not find its sepcs. I know, I have misplaced quite a few bolts haven't I?
Everything is assembled, except for this ground cable.
I want to drive it open headers tomorrow morning, so
!!! 
Everything is assembled, except for this ground cable.
I want to drive it open headers tomorrow morning, so
!!! Thread Starter
TECH Resident
Joined: Jul 2009
Posts: 772
Likes: 0
From: Bahrain
I was told by a highly experienced friend that if the PCM ground cable is not ground properly to the block, the engine will not start. Is this true?
Trending Topics
TECH Veteran
Joined: Dec 2008
Posts: 4,145
Likes: 61
From: Little Rock, AR
It will run. I've read lots of posts of running LT1s with that not grounded. The PCM has multiple grounds. It is better to have them all grounded to avoid odd problems, though.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Resident
Joined: Jul 2009
Posts: 772
Likes: 0
From: Bahrain
i am writing to you off the nose of the camaro.
i earthed the pcm, all the wires are connected, timing has been double checked, there is spark but it wont start.
there is over 30 litres of fuel in the tank (i just filled it with a big can), and it seems to be getting fuel because a few cylinders fired up but it wont even run.
what could be the reason? could it be the valve lash adjustment? i did it according to comp cams, however the lifters were soft when i did it, so should i attempt to do the adjustment once again?
HURRY UP! lol
i earthed the pcm, all the wires are connected, timing has been double checked, there is spark but it wont start.
there is over 30 litres of fuel in the tank (i just filled it with a big can), and it seems to be getting fuel because a few cylinders fired up but it wont even run.
what could be the reason? could it be the valve lash adjustment? i did it according to comp cams, however the lifters were soft when i did it, so should i attempt to do the adjustment once again?
HURRY UP! lol
If it is indeed an opti issue , it would be neat if somebody would develope an opti with removeable weather pack optical sensor. This would make opti service/trouble shooting much easier.
I would go over ignition wiring with voltmeter to be sure.
I would go over ignition wiring with voltmeter to be sure.
Thread Starter
TECH Resident
Joined: Jul 2009
Posts: 772
Likes: 0
From: Bahrain
I readjusted the valve lash, and it roared to life once again, open headers 
I had remembered when I removed the lifters, I had put them upside down to get the dirty oil out of them. I soaked them in 20w50 for about a day I think as I was doing other things with the engine, and then I did set the valve lash after installing the heads. However, they had no pressure in them, and I probably ended up with wrong adjustment that the valves never seated shut after the lifters pumped up, no compression and hence no combustion.
However, it did idle at 400-450 RPM and was very rough, the rockers were so loud I thought the headers were banging the body. I revved it up to 800RPM and the sound went away. The O2 sensors were not plugged in as I have yet to make the extensions.
Is this normal to idle that low without the tune? I did port the heads and match the intake as well.
Even at that low RPM I had 40psi oil pressure, which I am very happy about.
Now awaiting my OBD1 cable to arrive, and start messing with Tunercats
I had remembered when I removed the lifters, I had put them upside down to get the dirty oil out of them. I soaked them in 20w50 for about a day I think as I was doing other things with the engine, and then I did set the valve lash after installing the heads. However, they had no pressure in them, and I probably ended up with wrong adjustment that the valves never seated shut after the lifters pumped up, no compression and hence no combustion.
However, it did idle at 400-450 RPM and was very rough, the rockers were so loud I thought the headers were banging the body. I revved it up to 800RPM and the sound went away. The O2 sensors were not plugged in as I have yet to make the extensions.
Is this normal to idle that low without the tune? I did port the heads and match the intake as well.
Even at that low RPM I had 40psi oil pressure, which I am very happy about.
Now awaiting my OBD1 cable to arrive, and start messing with Tunercats
