Glow Plug Relay question

Reply Subscribe

Thread Tools

Search this Thread

Apr 2, 2014 | 09:14 AM

X1Lightning

Thread Starter

Senior User

Joined: Jun 2009

Posts: 276

Likes: 0

Glow Plug Relay question

I have a 99 7.3, and it will not start when the temp is below 30 if its not plugged in. so last night i swapped out the GPR but the pedestal this thing sat on is pretty corroded.

the truck is still not starting at 25 degrees

My question is does the GPR need a clean contact with that pedestal for a ground? or will it work regardless?

Apr 2, 2014 | 09:19 AM

X1Lightning

Thread Starter

Senior User

Joined: Jun 2009

Posts: 276

Likes: 0

also what is the relay that is right next to the GPR ?

Apr 2, 2014 | 09:19 AM

timmyboy76

Lead Driver

Joined: Sep 2010

Posts: 7,793

Likes: 50

no, on the pedestal,theres rubber bushings, so no to the grounding. May want to ohm out the gp's.

Apr 2, 2014 | 09:20 AM

timmyboy76

Lead Driver

Joined: Sep 2010

Posts: 7,793

Likes: 50

Quote:

Originally Posted by X1Lightning

also what is the relay that is right next to the GPR ?

the same relay that powers the gp's...its the AIH relay..(air intake heater)

Apr 2, 2014 | 09:23 AM

X1Lightning

Thread Starter

Senior User

Joined: Jun 2009

Posts: 276

Likes: 0

what do you mean its the same relay that powers the glow plugs? its definitely a lot taller than the GPR

Apr 2, 2014 | 09:28 AM

timmyboy76

Lead Driver

Joined: Sep 2010

Posts: 7,793

Likes: 50

its the same relay. Its sits higher on the pedestal / bushings. I'm using mine now..(aih relay) to power the gp's, since my oem gpr took a dump, 3yrs ago

Apr 2, 2014 | 09:35 AM

X1Lightning

Thread Starter

Senior User

Joined: Jun 2009

Posts: 276

Likes: 0

so the AIH is not really needed then? or are you running them both off one relay?

when i was swapping out my GPR i noticed the studs on the AIH were very corroded

Top 10 Ford Truck Tragedies

Joe Kucinski

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Michael S. Palmer

10 Most Surprising 2026 Ford Truck Features!

Joe Kucinski

Top 10 Ford Trucks Coming to Mecum Indy 2026

Brett Foote

5 Best / 5 Worst Ford Truck Wheels of All Time

Joe Kucinski

Apr 2, 2014 | 11:45 AM

lhud

Elder User

Joined: Dec 2006

Posts: 718

Likes: 2

From: Chattanooga, TN

There's nothing wrong with doing the AIH delete mod and using that relay to power the GP's. You can then have time to fix the original GP relay or just continue using the relay for the AIH. If swapping the relays your truck doesn't then start without plugging it in, most likely your GP's will be at fault and as mentioned above you will need to ohm out each of your GP's.

Apr 2, 2014 | 12:14 PM

#10

scotttahoe

Posting Guru

Joined: Jan 2013

Posts: 2,215

Likes: 2

From: North Lake Tahoe

The E99 trucks don't have an AIH and utilizes only one GPR. My truck starts in 14* temps all day long with no issues. If the glow plugs and relay are in premium working condition I "personally" don't think there is any need for the AIH.

Check put the Stancor GPR.
Welcome to guzzle's White-Rodgers (Stancor) GPR replacement Mod Web Page

Apr 2, 2014 | 03:28 PM

#11

kefrko

Tuned

Joined: Mar 2013

Posts: 343

Likes: 5

From: Plumsteadville PA

Quote:

Originally Posted by X1Lightning

so the AIH is not really needed then? or are you running them both off one relay? when i was swapping out my GPR i noticed the studs on the AIH were very corroded

It is a heater element that sticks into the intake. People argue back and forth whether it reduces air flow or not. I still have mine in but not necessarily because I think I need it or it's beneficial. I just haven't gotten around to deleting it. I don't know how it couldn't restrict air flow at least a little bit. It only activates under a very specific criteria including the parking brake being engaged, oil temps, etc. it helps warm the intake air to reduce smoke out of the tailpipe. If you remove it, most people report a soft code that doesn't set off the CEL. You can either grind off the element and reinstall the threaded stock plug or you could buy one of the cool looking plugs from various sites. If you need it for emissions you are probably better off leaving it intact.

And x2 on the Stancor GPR. That thing is legit!