Lost Jumper Wire.

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Yesterday | 05:09 PM

GOLDBLUEF150

Thread Starter

3rd Gear

Joined: Jun 2026

Posts: 3

Likes: 0

Lost Jumper Wire.

I have a 1999 F150 4.6 2v. I had to remove the heads to repair a broken spark plug. I replaced valve seals and timing chain while open. I also had to mill out two manifold studs and add helicoils. I installed 8 plug inserts. I am now putting it back together when I have the time. The only engine opening is the throttle body. I installed the intake today and tightened the valve covers. I cannot find the last injector connector. Is there a jumper? I did find a jumper for the left head temperature sensor. I cannot find the injector connector for the first or second injector on the left side (driver US). It has been about 8 weeks since I removed the heads and I have most screws labeled in zip loc bags. I am about an hour from starting if I could fine that injector connector.

Yesterday | 06:31 PM

BareBonesXL

Fleet Mechanic

Joined: Jun 2023

Posts: 1,400

Likes: 384

From: WA

When you say jumper, do you mean extension? And when you say last do you mean #8?

Not clear if you have 8 connectors and one doesn't reach or if you only have 7.

Yesterday | 07:50 PM

GOLDBLUEF150

Thread Starter

3rd Gear

Joined: Jun 2026

Posts: 3

Likes: 0

I only see 3 injector connectors on the left side. I am calling #1 the cylinder near the radiator. It could be the one by the firewall that is missing . Yes, jumper is an extension. I only guessed #1 because the harness ends by the radiator.

Yesterday | 09:03 PM

BareBonesXL

Fleet Mechanic

Joined: Jun 2023

Posts: 1,400

Likes: 384

From: WA

My 2003 electrical diagrams show one power supply wire with only splices on the path to each injector. Then no splices on the way to the PCM. So no injector connectors on a 2003 have a jumper.

https://help.summitracing.com/knowle...HE-04978/en-us

Today | 08:04 AM

manicmechanic007

Hotshot

Joined: Jul 2020

Posts: 10,605

Likes: 2,679

From: Near Salt Lake City

All 4 should be coming out that side of the loom, keep looking, some of the injector pigtails are only about 3 inches long coming out of the harness
There is never a jumper that I am aware of

Today | 09:40 AM

RacingJake

Cross-Country

Joined: Jul 2006

Posts: 67

Likes: 20

Get a big bright light and double check all wiring again, it's most likely hiding under some wiring.

Today | 10:43 AM

GOLDBLUEF150

Thread Starter

3rd Gear

Joined: Jun 2026

Posts: 3

Likes: 0

Thank you all. It was hiding. The harness was stuck under a sheet metal bracket on the back of the LHS. I had to remove the intake to properly organize the harness. The harness slid out about three inches and there it was. I put the intake back to close the engine. I just re-power washed around the oil filter, AC side, and the concrete. On the back of the RHS head, there are two bolts holding a dip stick tube with m6 protrusions. Are they designed for push connectors?