Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Missing a relay??

Old Jun 25, 2019 | 06:37 PM
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jbuck_atlanta's Avatar
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Car: 89' RS
Engine: 305
Transmission: 700r4
Missing a relay??

I have a 1989 305ci v8 with auto trans. I believe tbi if its got the fat round thing in the middle. I was just replacing my fan relay again for the fourth time in the past month (could use help on that too) and so I just looked up what all the relays are supposed to look like. Every page seems to mention 3 relays on the drivers side panel but I only have 2(picture at bottom). My engine will also shut off whenever I put it in drive, reverse, or leave it in park for a couple minutes. I also have a question about underneath the tbi round thing that the air filter is in (please tell me the name so I can say it correctly). There is a vacuum hose plugged into the bottom of it that goes to a blue thing in the air filter labeled “AC” in the inside (picture at bottom) and when i unplug it the car idles higher and when its plugged up it shuts the car off. Ive put in new spark plugs, wires, and fuel filter today.

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Old Jun 25, 2019 | 08:51 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Missing a relay??

The blue thing appears to be a temp sensor for the hot gasses of the heater stove pipe.
what relay is missing ?
fuel pump and fan should be the only ones there.
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Old Jun 26, 2019 | 05:43 PM
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From: San Jose, CA, USA
Car: 88 IROC-Z - original owner!
Engine: LB9 with K&Ns, MSD, Foil, Taylor
Transmission: WC T-5
Axle/Gears: BW 9-bolt, 3.45 posi
Re: Missing a relay??

I believe the cars with the extra relay there are TPI cars, and the extra relay is for MAF burnoff. You don't have a MAF so no need for a burnoff relay.
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Old Jul 1, 2019 | 08:36 AM
  #4  
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Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Relay Race

Originally Posted by jbuck_atlanta
replacing my fan relay again for the fourth time in the past month
The stock relay is barely unuff to do the job.

The main contacts are too small, plastic chosen for the unit has too low of a melting temp.

There is more than one way to cure the problem.

A proven successful way is to install a 70 amp relay in the circuit.

The 70 amp unit will then be energized by stock wimpy relay.

Wimpy relay will now last 4ever.

Use heavier wire for the 70 amp unit.

The power increase to your fan will be 17%

Make your temp gage say “ahhh that’s better”.


Happy Racing !



If Your Communications Antenna Is Not Shaking At Idle, Your Cam Is Too Mild
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