PCM Diagnostics & Tuning HP Tuners | Diablo | Pantera EFI

P0200 error.. listing issues in body.

Old 02-17-2019, 08:33 PM
Teching In
Thread Starter
Join Date: Dec 2017
Posts: 22
Default P0200 error.. listing issues in body.

New(er) to LS engines and troubleshooting is my weak area still.

I have an LQ4
  • trick flow GenX220 fast as cast heads.
    • Yella Terra YT6645 roller rockers
  • Howards cam model 196765-12
    • 228/234 @.05"
    • .604/.609" lift.
    • 112 lobe seperation
    • 108 intake centerline
  • LS6 intake
  • 36lb Fast 303608 injectors
  • Hooker Super Competition Headers 2201
  • New Wiring specialties LSx wire harness
  • Setup as Speed Density
My idle is rough'ish fluctuating between 725-800RPMs. I have a P0200 injector circuit malfunctioning. My manifold pressure is also fluctuating 7-8lbs. there are no cylinder misfire codes

My thoughts are a leaking intake manifold gasket for the low manifold pressure. The Injectors are new and not sure how to test the injectors. Its a delphi harness with adapters between harness plug and injectors. was also thinking to go and get NOID light to test the harness through the adapter. not sure its necessary as I have no engine misfire codes. should I still do this step? tomorrow moring I also plan on taking my can of starter fluid and spray all vacuum hoses to detect for idle change (leaks).

What am I missing, or any suggestions? I am almost shooting in the dark here.

Picture of my car and engine added. thank you in advance.

jkhall is offline  
Old 02-17-2019, 10:14 PM
TECH Senior Member
Join Date: Jun 2016
Location: Central Cal.
Posts: 9,768

If you suspect a manifold vacuum leak I would address that first. Pull the manifold and check all the O-rings. If suspected, put in new ones. Cheap insurance.
G Atsma is offline  

Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: