No Start

Reply Subscribe

Thread Tools

Search this Thread

Aug 9, 2023 | 10:21 AM

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No Start

Not sure where this went so here goes 89 no start fuel pressure 40 on cranking spark ,I put new injectors in , so had it running but not being smart I disconnected the one terminal on battery thinking the old way of checking alternator is what I do yes dumb *** move now no start …..please help Iam lost btw new ECM

Aug 9, 2023 | 11:04 AM

Tunedport90

Melting Slicks

Joined: Aug 2011

Posts: 2,844

Likes: 176

Disconnecting the battery is a good way to have the alternator spike and destroy electronics . So your just missing injector pulse ?

Aug 9, 2023 | 11:11 AM

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No start

Quote:

Originally Posted by Tunedport90

Disconnecting the battery is a good way to have the alternator spike and destroy electronics . So your just missing injector pulse ?

I believe there is pulse I measured each injector reading 13.9 all of them but as you asked Iam not thinking it’s pulsing fuel plug looked dry

Aug 9, 2023 | 11:19 AM

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

Quote:

Originally Posted by fooda2

I believe there is pulse I measured each injector reading 13.9 all of them but as you asked Iam not thinking it’s pulsing fuel plug looked dry

also power to leads test light I used for that

Aug 9, 2023 | 11:34 AM

Tunedport90

Melting Slicks

Joined: Aug 2011

Posts: 2,844

Likes: 176

Use a noid light, you could have a bad icm or could even be a unrelated vats issue.

Aug 9, 2023 | 12:43 PM

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

ICM? The ECM I replaced I’ve used noid light very weak light though

Aug 9, 2023 | 01:38 PM

Tunedport90

Melting Slicks

Joined: Aug 2011

Posts: 2,844

Likes: 176

Does the noid get brighter with all injectors unplugged. If noid is blinking the icm (ignition control module) is probably fine. Are these the newer D3 injectors ohm seems kinda low

Aug 9, 2023 | 02:00 PM

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No start

Not D5 but I did not try with all injectors unplugged I try that now , is there a hidden fuse Iam not seeing ?

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Joe Kucinski

8 Coolest Corvette Pace Cars (and Replicas) of All Time

Verdad Gallardo

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Joe Kucinski

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Verdad Gallardo

Top 10 Corvettes Coming to Mecum Indy 2026!

Brett Foote

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Michael S. Palmer

10 Revolutionary 'Corvette Firsts' Most People Don't Know

Joe Kucinski

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

Michael S. Palmer

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Joe Kucinski

10 Most Common Corvette Problems of the Last 20 Years!

Joe Kucinski

Aug 9, 2023 | 02:18 PM

Tunedport90

Melting Slicks

Joined: Aug 2011

Posts: 2,844

Likes: 176

Quote:

Originally Posted by fooda2

Not D5 but I did not try with all injectors unplugged I try that now , is there a hidden fuse Iam not seeing ?

I don’t know what D5 are or what fuse your referring to.

Aug 9, 2023 | 02:40 PM

#10

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No start

Sorry I meant D3 injectors you mentioned, Iam thinking these injectors are not getting pulse from ECM to operate noid light is full but just steady

Aug 9, 2023 | 02:51 PM

#11

Tunedport90

Melting Slicks

Joined: Aug 2011

Posts: 2,844

Likes: 176

Quote:

Originally Posted by fooda2

Sorry I meant D3 injectors you mentioned, Iam thinking these injectors are not getting pulse from ECM to operate noid light is full but just steady

back to icm if not blinking the noid, bad ecm ground or vats. Unless the reference line from icm to ecm purple/white is damaged or unplugged.

Aug 9, 2023 | 02:55 PM

#12

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No start

Ok that puts me in better position I will check wires , ground , vats I’ll wing it it turns over but who knows

Aug 9, 2023 | 02:57 PM

#13

Tunedport90

Melting Slicks

Joined: Aug 2011

Posts: 2,844

Likes: 176

I’d guess a icm got damaged from voltage spike but just a guess.

Aug 9, 2023 | 03:24 PM

#14

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No start

I don’t believe these injectors are spraying fuel plugs bone dry.,,,I grounded ECM case to negative side of battery…no luck

Aug 9, 2023 | 03:26 PM

#15

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No start

Wouldn’t I have no spark if so ?

Aug 9, 2023 | 09:23 PM

#16

C5 Diag

Moderator, Tech Contributor

Joined: Sep 2013

Posts: 15,434

Likes: 3,981

From: Cape Coral, Florida

Quote:

Originally Posted by fooda2

ICM? The ECM I replaced I’ve used noid light very weak light though

On these injectors the noid light will be very dim…I just use a LED test light connected to battery positive…these injectors usually draw less than 1 amp.

Aug 9, 2023 | 09:41 PM

#17

fooda2

Thread Starter

Heel & Toe

Joined: Oct 2013

Posts: 24

Likes: 0

No start

Ok thank you for the info the noid light is very dim , clamp to positive side of battery and go to each terminal on injector wire?

Aug 9, 2023 | 09:51 PM

#18

C5 Diag

Moderator, Tech Contributor

Joined: Sep 2013

Posts: 15,434

Likes: 3,981

From: Cape Coral, Florida

Quote:

Originally Posted by fooda2

Ok thank you for the info the noid light is very dim , clamp to positive side of battery and go to each terminal on injector wire?

These injectors are “ground side switched” meaning the PCM supplies a ground to make the injectors work…that is why we hook the test light to battery positive !!