PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Microsquirt no rpm sync

Thread Tools
 
Search this Thread
 
Old Jul 24, 2018 | 11:09 PM
  #1  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default Microsquirt no rpm sync

I have turbo 5.3 ls using a microsquirt v3 controller. I ordered the plug and play harness from diy auto tune with microsquirt package. I had the car running pretty good but then it started dying intermittently at low rpm. Now it won't start at all and shows no rpm sync on tuner studio. All other gauges are working. I did notice I would have a small amount of rpm when letting of the key for just that split second. Other than that I have no signal. I replaced crank sensor and also check to have ground and 12v at plug. Still says no sync. I ran spark test with tuner studio and could see spark coming out of coils. I have no spark and no fuel now. I am new to all this as this is my first microsquirt build. What else should I check?
Reply
Old Jul 25, 2018 | 06:31 AM
  #2  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Hook up jumper cables or a charger to it. Low voltage and low cranking RPM will cause it to not sync RPM while cranking.
Reply
Old Jul 25, 2018 | 09:12 AM
  #3  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default

I did try that with no luck. The battery is brand new.
Reply
Old Jul 25, 2018 | 09:29 AM
  #4  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Any chance you're getting the cam and crank sensors confused?
Reply
Old Jul 25, 2018 | 09:33 AM
  #5  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default

The controller only has a crank sensor. I thought it was a ground problem but I cleaned them and tightened them up.
Reply
Old Jul 25, 2018 | 09:35 AM
  #6  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Originally Posted by Turbo5
The controller only has a crank sensor. I thought it was a ground problem but I cleaned them and tightened them up.
Yes, but the crank sensor connector will plug right into the cam sensor at the back of the valley cover. Common mistake.
Reply
Old Jul 25, 2018 | 10:24 AM
  #7  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default

Ok I doubled checked. I am sure it is in crank sensor located on the passenger side just above the starter.
Reply
Old Jul 25, 2018 | 10:30 AM
  #8  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

When you connect it, are all of the sensors reading OK? TPS, MAP, CLT?
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

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

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Jul 25, 2018 | 10:35 AM
  #9  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default

Yes everything else seems to be reading fine.
Reply
Old Jul 25, 2018 | 11:08 AM
  #10  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Email me the tune, I'll use it to fire up one of my micro controlled setups and rule out any software issues.

joefields1987@gmail.com
Reply
Old Jul 26, 2018 | 11:07 PM
  #11  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default

So talked to guy at diy auto tune and realized I had a 24x reluctir wheel instead of 58x. My engine is an 2000. So I went back with the original tune they sent me and changed in the ignition setting to ls1. I am now getting rpm and it gets to fire but acts like the timing is to advanced then blows the coil fuse. So i tried another fuse and same thing. It lit then blew the fuse and died. What would case the coil fuse to continue to blow?
Reply
Old Jul 31, 2018 | 09:33 AM
  #12  
Mymonte666's Avatar
Teching In
 
Joined: Jul 2018
Posts: 29
Likes: 0
Default

you dwell time settings can cause the coils to overheat and blow fuses.
Reply
Old Jul 31, 2018 | 09:56 AM
  #13  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default

Thank you guys for your help! You were correct on the dwell setting! I am now up and running again finally. Where would I find a good tune for my set up. 5.3 ls 24x 7875 turbo, sloppy stage 2 cam, btr springs, microsquirt controller,....
Reply
Old Jul 31, 2018 | 10:21 AM
  #14  
JoeNova's Avatar
Restricted User
 
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
Default

Originally Posted by Turbo5
Where would I find a good tune for my set up. 5.3 ls 24x 7875 turbo, sloppy stage 2 cam, btr springs, microsquirt controller,....
You have about the most common, plain jane, overdone setup in the history of engine setups.
So I'd imagine you would get a base tune from someone at the sloppy mechanics facebook page.
Reply
Old Jul 31, 2018 | 10:45 AM
  #15  
Turbo5's Avatar
Thread Starter
Teching In
 
Joined: Jul 2018
Posts: 8
Likes: 0
Default

Thanks
Reply




All times are GMT -5. The time now is 07:31 PM.

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