Some 91 relay questions
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From: Columbus, OH, USA
Car: '91 Z28, '13 Civic EX-L
Engine: 355 LT1, 1.8 I4
Transmission: T56, 5spd auto
Axle/Gears: 10 bolt 3.42(as long as no breaky)
Some 91 relay questions
I need to know what the red wire on the fuel pump relay goes to.
Also, the secondary fan relay, what does the grey wire go to other than the sensor on the A/C? What is the function of that sensor? (it looks like the low pressure side)
Also, the secondary fan relay, what does the grey wire go to other than the sensor on the A/C? What is the function of that sensor? (it looks like the low pressure side)
Thread Starter
Member
iTrader: (1)
Joined: Feb 2005
Posts: 424
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From: Columbus, OH, USA
Car: '91 Z28, '13 Civic EX-L
Engine: 355 LT1, 1.8 I4
Transmission: T56, 5spd auto
Axle/Gears: 10 bolt 3.42(as long as no breaky)
Re: Some 91 relay questions
Ok,
I am swapping in an LT1 and i have a new engine harness from speartech.
The grey wire i am refering to is on the "heavy duty cooling" fan relay.
On the original 305 harness i know the wire went to the ECM and also to te fan a/c pressure switch(that switch i was refering to).
Obviously i no longer will be running a ECM, so i believe i can just splice the PCM wire on the new harness into that wire by the relay. Correct me if im wrong.
As for the red wire, i know it is the fuel pump prime connection. I cant remember where it went on the old engine and would like some help on that please.
Thanks.
I am swapping in an LT1 and i have a new engine harness from speartech.
The grey wire i am refering to is on the "heavy duty cooling" fan relay.
On the original 305 harness i know the wire went to the ECM and also to te fan a/c pressure switch(that switch i was refering to).
Obviously i no longer will be running a ECM, so i believe i can just splice the PCM wire on the new harness into that wire by the relay. Correct me if im wrong.
As for the red wire, i know it is the fuel pump prime connection. I cant remember where it went on the old engine and would like some help on that please.
Thanks.
Joined: Mar 2000
Posts: 5,703
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From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: Some 91 relay questions
On '90-'92 it is just loose under the hood coming from the relay.(black plug)
It's just there if you need to run the fuel pump with the engine off.
Thread Starter
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iTrader: (1)
Joined: Feb 2005
Posts: 424
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From: Columbus, OH, USA
Car: '91 Z28, '13 Civic EX-L
Engine: 355 LT1, 1.8 I4
Transmission: T56, 5spd auto
Axle/Gears: 10 bolt 3.42(as long as no breaky)
Re: Some 91 relay questions
Cool. Thanks.
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