LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Rough Idle?

Thread Tools
 
Search this Thread
 
Old Apr 10, 2016 | 04:05 PM
  #1  
BuiltLT1T/A's Avatar
Thread Starter
Teching In
 
Joined: Nov 2015
Posts: 14
Likes: 0
Default Rough Idle?

Let me start by saying my car "ran" perfect.

Yesterday I pulled off timing cover and changed all the seals due to a WP oil leak.

Also added the JEGGS imitation MSD wires.

Went to start her up and struggled to start. I mean 4 cycles of cranks just to get a slow 100 to 1000rpm climb.

After about 10 seconds of 700-1200 fluctuates the car dies. Did it again and the same. This is what happens every time I crank it.

Any ideas!?

Only trouble code is MAF. Happens even when I unplug it. All spark wires are to correct cylinder. All cylinders are firing (each header is equally hot).
Reply
Old Apr 10, 2016 | 04:55 PM
  #2  
hrcslam's Avatar
TECH Addict
 
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
Default

Probably have the opti clocked wrong.
Reply
Old Apr 10, 2016 | 06:54 PM
  #3  
BuiltLT1T/A's Avatar
Thread Starter
Teching In
 
Joined: Nov 2015
Posts: 14
Likes: 0
Default

95s and up can only go on one way. Just took it all back apart and it was right!
Reply
Old Apr 10, 2016 | 07:01 PM
  #4  
hrcslam's Avatar
TECH Addict
 
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
Default

Hmmm, still running like poo?

What year is your ride?
Reply
Old Apr 10, 2016 | 07:17 PM
  #5  
BuiltLT1T/A's Avatar
Thread Starter
Teching In
 
Joined: Nov 2015
Posts: 14
Likes: 0
Default

Originally Posted by hrcslam
Hmmm, still running like poo?

What year is your ride?
It's a 95. I haven't reassembled it because I don't wanna have to retake it apart.

95s an up have a dowel sticking out of the cam that fits into a slot on the back of the opti. When I just pulled it (which f'ing sucks!) the dowel was in the right slot.

Do you think my opti could be bad? I'd rather replace it now then have to disassemble the whole engine bay again.
Reply
Old Apr 10, 2016 | 08:32 PM
  #6  
hrcslam's Avatar
TECH Addict
 
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
Default

Originally Posted by BuiltLT1T/A
It's a 95. I haven't reassembled it because I don't wanna have to retake it apart.

95s an up have a dowel sticking out of the cam that fits into a slot on the back of the opti. When I just pulled it (which f'ing sucks!) the dowel was in the right slot.

Do you think my opti could be bad? I'd rather replace it now then have to disassemble the whole engine bay again.
You can disassemble it and inspect the inernals. Anything obviously wrong, replace it with an AC Delco or Delphi. If your sensor has a Mitsubishi logo on it keep it! When you reassemble it, loctite the rotor screws and seal it up.

Also, read this.
Reply
Old Apr 10, 2016 | 09:40 PM
  #7  
BuiltLT1T/A's Avatar
Thread Starter
Teching In
 
Joined: Nov 2015
Posts: 14
Likes: 0
Default

Thanks a lot man!

Just reassembled it without the water pump to fire it up and see if resetting it would change anything.

I guess I am a liar because it now idles smooth as can be.

WP goes on in the morning and its back on the streets!
Reply




All times are GMT -5. The time now is 10:53 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


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