losing injector pulse
Thread Starter
Teching In
Joined: Dec 2012
Posts: 4
Likes: 0
losing injector pulse Hi i dont know if this is the right place to ask this but anyways.
Im working on a 67 corvette with a ls2 swap using a painless harness. the car ran fine for about a month prior to the issue and then sat for about 3 weeks. The battery was dead when it went to get fired up next so it got replaced.
The issue that is happening is the car well start up after sitting for about a day and run fine for about 5 min then shut off and if i try to start it again it just cranks over . the car well start and run off brake clean being sprayed in the intake. i have checked all powers and grounds going to the pcm, checked all the injector wires for continuity from pcm to injectors , i have power to all the injector wires, and when i try to start the vehicle it pulses 3 times before it kills the injector signal, the vats is disabled and have also changed the pcm and still has the same issue. it dont throw any codes when this happens . it only threw a code once between both pcms which was a po200 and has not came back since cleared. also all the injectors ohm out @ 12.5-13.2
any suggestions are appreciated
Im working on a 67 corvette with a ls2 swap using a painless harness. the car ran fine for about a month prior to the issue and then sat for about 3 weeks. The battery was dead when it went to get fired up next so it got replaced.
The issue that is happening is the car well start up after sitting for about a day and run fine for about 5 min then shut off and if i try to start it again it just cranks over . the car well start and run off brake clean being sprayed in the intake. i have checked all powers and grounds going to the pcm, checked all the injector wires for continuity from pcm to injectors , i have power to all the injector wires, and when i try to start the vehicle it pulses 3 times before it kills the injector signal, the vats is disabled and have also changed the pcm and still has the same issue. it dont throw any codes when this happens . it only threw a code once between both pcms which was a po200 and has not came back since cleared. also all the injectors ohm out @ 12.5-13.2
any suggestions are appreciated
Hi i dont know if this is the right place to ask this but anyways.
Im working on a 67 corvette with a ls2 swap using a painless harness. the car ran fine for about a month prior to the issue and then sat for about 3 weeks. The battery was dead when it went to get fired up next so it got replaced.
The issue that is happening is the car well start up after sitting for about a day and run fine for about 5 min then shut off and if i try to start it again it just cranks over . the car well start and run off brake clean being sprayed in the intake. i have checked all powers and grounds going to the pcm, checked all the injector wires for continuity from pcm to injectors , i have power to all the injector wires, and when i try to start the vehicle it pulses 3 times before it kills the injector signal, the vats is disabled and have also changed the pcm and still has the same issue. it dont throw any codes when this happens . it only threw a code once between both pcms which was a po200 and has not came back since cleared. also all the injectors ohm out @ 12.5-13.2
any suggestions are appreciated
Im working on a 67 corvette with a ls2 swap using a painless harness. the car ran fine for about a month prior to the issue and then sat for about 3 weeks. The battery was dead when it went to get fired up next so it got replaced.
The issue that is happening is the car well start up after sitting for about a day and run fine for about 5 min then shut off and if i try to start it again it just cranks over . the car well start and run off brake clean being sprayed in the intake. i have checked all powers and grounds going to the pcm, checked all the injector wires for continuity from pcm to injectors , i have power to all the injector wires, and when i try to start the vehicle it pulses 3 times before it kills the injector signal, the vats is disabled and have also changed the pcm and still has the same issue. it dont throw any codes when this happens . it only threw a code once between both pcms which was a po200 and has not came back since cleared. also all the injectors ohm out @ 12.5-13.2
any suggestions are appreciated
Thread Starter
Teching In
Joined: Dec 2012
Posts: 4
Likes: 0
Vats is disabled in both pcm's that I have just checked again with hp tuners.
Replaced crank sensor also still same issue.
after some more testing today i also found that if i disconnect the battery and swap the pcm it well fire up and run great no codes and no issues until i turn it off and try to restart the vehicle then it goes back to only pulsing the injectors 3 times then nothing . If i disconnect the battery and swap pcms again it well fire up and run until i shut it down again . I tried this 4 times just to see what would happen and have the same results every time.
Im running out of ideas as to what is going on ?
Replaced crank sensor also still same issue.
after some more testing today i also found that if i disconnect the battery and swap the pcm it well fire up and run great no codes and no issues until i turn it off and try to restart the vehicle then it goes back to only pulsing the injectors 3 times then nothing . If i disconnect the battery and swap pcms again it well fire up and run until i shut it down again . I tried this 4 times just to see what would happen and have the same results every time.
Im running out of ideas as to what is going on ?
TECH Senior Member
Joined: Jun 2016
Posts: 22,308
Likes: 3,625
From: Central Cal.
Trending Topics
Teching In
Joined: Dec 2021
Posts: 9
Likes: 1
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
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!
