Crank no start, Intermediate Injector Pulse.

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Jun 15, 2025 | 12:27 PM

EthanFr

Thread Starter

7th Gear

Joined: Jun 2025

Posts: 7

Likes: 1

From: Tennessee

Crank no start, Intermediate Injector Pulse.

Hey guys, I’m new here, I’ve had my Is300 for about a year now I’ve rebuilt it (Pushing 270 cylinder psi dry) and made it look nice. Just recently I was driving it when it Has decided to shut off while driving… Strange… Got it towed to my house. sprayed Starting fluid in intake and it ran Just bad ofc. I then went to check if my fuel pump was working… I head it hum and took off the feed line to engine and put a hose there to see if pump out gas. I then rented out a noid light to see what the injector pulse looks like. Needless to say it’s random; sometimes it’s nice and bright, then no light, then dim light on all 6 injector plugs.. I have replaced my Crankshaft position sensor and still no luck.. I’m leaning towards bad Ecu.. Also all fuses related to fuel and spark have been good, I checked them all. Down below is a video of my car attempting to start, and the noid light situation.

Attached Files

IMG_4722.mov (16.90 MB, 11 views)

IMG_4699.mov (19.18 MB, 9 views)

Jun 16, 2025 | 03:10 AM

2001SolarY

Intermediate

Joined: Feb 2019

Posts: 325

Likes: 34

From: Georgia

Make sure your IGF signal is not being loss do to bad connections or coils.

Jun 16, 2025 | 03:13 AM

EthanFr

Thread Starter

7th Gear

Joined: Jun 2025

Posts: 7

Likes: 1

From: Tennessee

Quote:

Originally Posted by 2001SolarY

Make sure your IGF signal is not being loss do to bad connections or coils.

Isn't that the b+ wire that goes from the ecu to the igniter to Coils, and 02 sensors and all that? I checked the voltage and it’s steady 11.34 volts

Jun 17, 2025 | 04:41 AM

2001SolarY

Intermediate

Joined: Feb 2019

Posts: 325

Likes: 34

From: Georgia

Yes I think so, But you need to make sure where the drop comes from. So check from the coils back.

Jun 17, 2025 | 04:46 AM

EthanFr

Thread Starter

7th Gear

Joined: Jun 2025

Posts: 7

Likes: 1

From: Tennessee

I checked it it’s getting good voltage… Changed my camshaft position sensor too still nothing, Injectors still get intermediate pulse. I’m pretty sure it’s the ecu because occasionally I get no communication on my ecu while i got my scan tool attached… It also says my injectors are pulsing at 30Ms or so but doesn’t pulse.

Jun 18, 2025 | 04:54 AM

2001SolarY

Intermediate

Joined: Feb 2019

Posts: 325

Likes: 34

From: Georgia

Communication issue is usually a fuse issue. You could try replacing the igniter. Have you seen that the coils are firing? I also assume you checked the crank sensor wheel.

Jun 18, 2025 | 05:11 AM

EthanFr

Thread Starter

7th Gear

Joined: Jun 2025

Posts: 7

Likes: 1

From: Tennessee

Fixed

I figured it out, Turns out it was the fuel pump… Which is strange because i swapped it out with another oem lexus one and it didn’t want to start.. Got that walbro 255 fuel pump.. Now it sounds cammed 😆😆

Attached Files

IMG_4813.mov (19.57 MB, 11 views)