C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Please help

Thread Tools
 
Search this Thread
 
Old Jul 25, 2020 | 07:49 PM
  #21  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

also if i start it in the morning it will run like nothing is wrong
Reply
Old Jul 25, 2020 | 07:50 PM
  #22  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

Just curious, why did you replace the opti in the first place?
Reply
Old Jul 25, 2020 | 07:50 PM
  #23  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

for the most part no spark .
Reply
Old Jul 25, 2020 | 07:51 PM
  #24  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

So you are losing spark and injector pulse?
Reply
Old Jul 25, 2020 | 07:52 PM
  #25  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

i replaced it because of the code and misfire .
Reply
Old Jul 25, 2020 | 07:59 PM
  #26  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

Can you get a scan tool to run some tests?
Reply
Old Jul 25, 2020 | 08:19 PM
  #27  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

what type i only have a code reader and a ohm meter
Reply
Old Jul 25, 2020 | 08:22 PM
  #28  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

about to get the tourqhead kit or theLltcc kit what do you think about those kits ?
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-1

2027 Corvette vs The World: Every Model vs Closest Competitor

 Joe Kucinski
story-2

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-3

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
story-4

2027 Corvette Buyer's Guide: Everything You Need to Know!

 Joe Kucinski
story-5

10 Things C8 Corvette Owners Hate (But Won't Tell You)

 Joe Kucinski
story-6

10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

 Brett Foote
story-7

Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

 Joe Kucinski
story-8

Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

 Michael S. Palmer
story-9

5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

 Joe Kucinski
Old Jul 25, 2020 | 09:05 PM
  #29  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

I'm a stock type of guy.. You need a scan tool to determine if you're losing the signal from the distributor. Let me check my service manual in the am to see if there's another way to check it.
Reply
Old Jul 26, 2020 | 11:50 AM
  #30  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

okay did a couple of test this morning .i read on line how test to see if the optispark is getting signal with out a scanner.first i checked fuel pressure turn key with out cranking .48 psi it held pressure for about 15-20 mins only dropped to between 45-46 psi .of course it fired right up ,this time i let idle until it cut off .i got my test light and touched the wires going to the injectors had wife to crank the car the test light lit up but the car did not crank any more .while the car was running no codes when it cut off .when it would not crank the p1371 code came back
Reply
Old Jul 26, 2020 | 12:47 PM
  #31  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

First things first, You need to address the no crank issue. I would disconnect the battery, then check the terminals/wiring to the starter.
There's some power feeds off that terminal that could be your whole problem.
Reply
Old Jul 26, 2020 | 01:56 PM
  #32  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

would you care to explain i,m curious .
Reply
Old Jul 26, 2020 | 05:11 PM
  #33  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

Originally Posted by lildog
would you care to explain i,m curious .
If you have a no crank condition, you need to fix it to determine if the distributor is able to generate a signal. when cranking. If the engine doesn't crank, the distributor doesn't turn. Makes sense?
Reply
Old Jul 26, 2020 | 05:19 PM
  #34  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

my bad the car cranks but will start after ten min of running .
Reply
Old Jul 26, 2020 | 05:20 PM
  #35  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

i was going to get the m.s.d. opti but went the cheap route thats what i get
Reply
Old Jul 26, 2020 | 05:53 PM
  #36  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

OK....Can you get to the distributor 4 wire connector? When this finally cuts out, you need to disconnect that connector and check the voltage on the red/black wire going to the ecm.with the key on...not the distributor.end. What voltage reading do you get? Now remember this is AFTER it cuts off.
Reply
Old Jul 26, 2020 | 05:59 PM
  #37  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

got ill let you know the results
Reply

Get notified of new replies

To Please help

Old Jul 26, 2020 | 06:00 PM
  #38  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

mean to say got it lol
Reply
Old Jul 26, 2020 | 06:17 PM
  #39  
Mrvettenick's Avatar
Mrvettenick
Drifting
All Eyes On Me
Liked
 
Joined: Aug 2019
Posts: 1,334
Likes: 225
Default

Basically we're checking the lines to the ECM and distributor before condemning the distributor.
Reply
Old Jul 30, 2020 | 07:46 PM
  #40  
lildog's Avatar
lildog
Thread Starter
Intermediate
 
Joined: Oct 2018
Posts: 29
Likes: 0
Default

okay i did a test today the car ran as usual.okay while it was running the red/black had 5.03 volts purple white wire had 5.02 . solid red wire 12.93 .when the car stopped red/black wire 0.239 volts before the plug and after . when i unplugged it back to 5,02 from ecu to the plug where it plugs into the optispark
Reply



All times are GMT -4. The time now is 04:49 PM.

story-0
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-1
2027 Corvette vs The World: Every Model vs Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-20 17:58:41


VIEW MORE
story-2
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-3
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-4
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-5
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-6
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-7
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE
story-8
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

Slideshow: Breaking down the 2027 Grand Sport, Grand Sport X, Stingray, and LS6 V8.

By Michael S. Palmer | 2026-03-26 13:48:45


VIEW MORE
story-9
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

Slideshow: 5 reasons bad drivers crash sports cars & 5 ways to avoid a costly shame!

By Joe Kucinski | 2026-03-25 16:32:55


VIEW MORE