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84 Z28 engine swap removing computer

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Old Oct 1, 2009 | 06:16 PM
  #1  
johnnyboy0274's Avatar
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84 Z28 engine swap removing computer

I am installing a 355 in my z28. I was wondering if anyone has any pointers about removing the computer system for the emissions. If you have any clues which wires can be takin out and just coiled up with the computer under the kick panel and disconnected.
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Old Oct 2, 2009 | 02:21 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I've got a pointer - keep the computer, have good street manners, good performance, and legal emissions.

Yes, it can be done. See my vBGarage.


No, it is not legal to remove the emissions equipment where you live.
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Old Oct 2, 2009 | 02:40 PM
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Re: 84 Z28 engine swap removing computer

I live in new jersey but the car is gonna be 25yrs old next year.It will be classic so im not worried about keeping the emissions because I wont have to get it inspected. Im just trying to find out I havent been under the car yet i dont know if I have an electric fuel pump and if the computer effects that.
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Old Oct 2, 2009 | 02:41 PM
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3rd gen Will's Avatar
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From: Peoria, AZ
Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: 84 Z28 engine swap removing computer

I agree with the above posted for emmision's reasons.

BUT if you really want to remove it.

1 you cannot run the stock carb.
2 you will want to run a vacuum advance distributor because advance in the stock dist is controlled by the computer. Not required right away, but your fuel mileage will really suck from what I understand.

When I removed the comp from my 84, I just removed the kick panel from the pass side and pushed the wiring into the fender after disconnecting the connector from the computer and the connector to that goes over to the driver side of the dash. Then pulled the harness up from the engine compartment from the cavity between the air box and fender. You will also want to take the bulb out of the cluster for the check engine light because it will always be on.
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Old Oct 2, 2009 | 02:43 PM
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3rd gen Will's Avatar
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From: Peoria, AZ
Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: 84 Z28 engine swap removing computer

Originally Posted by johnnyboy0274
I live in new jersey but the car is gonna be 25yrs old next year.It will be classic so im not worried about keeping the emissions because I wont have to get it inspected. Im just trying to find out I havent been under the car yet i dont know if I have an electric fuel pump and if the computer effects that.
If it's an LG4 you have a mech pump on the pass side of the engine. If you have a crossfire car it should have an electric pump in tank. I have no idea about the I4/V6 cars. If it's fuel injected, most likely has an in tank pump though.
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Old Oct 2, 2009 | 02:50 PM
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Re: 84 Z28 engine swap removing computer

Its a 305 HO with a quadrajet.
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Old Oct 3, 2009 | 10:30 PM
  #7  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
There was no EFI offered in '84 f-bodies.

Most of the L69's had both the mechanical on the engine, and in-tank electric.
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Old Oct 6, 2009 | 01:25 PM
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3rd gen Will's Avatar
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From: Peoria, AZ
Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: 84 Z28 engine swap removing computer

Originally Posted by five7kid
There was no EFI offered in '84 f-bodies.

Most of the L69's had both the mechanical on the engine, and in-tank electric.
My bad they only had the crossfire in 82-83.....right? lol
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Old Oct 6, 2009 | 02:22 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
https://www.thirdgen.org/1984-chevy-camaro
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Old Oct 7, 2009 | 01:28 PM
  #10  
3rd gen Will's Avatar
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From: Peoria, AZ
Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: 84 Z28 engine swap removing computer

Originally Posted by five7kid

All that work to post a link when you could have typed a simple....Yes.
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Old Oct 7, 2009 | 02:09 PM
  #11  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
"Work"?

3 clicks - one on the bottom of the page for the '84 Camaro link, one to copy the link, one to come back to this page to post a reply.

It's a "teach to fish" vs. "give a fish" thing. . .
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Old Oct 7, 2009 | 02:22 PM
  #12  
3rd gen Will's Avatar
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From: Peoria, AZ
Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: 84 Z28 engine swap removing computer

I am quite competent on how to find information on this site.

My post was more to the effect of the fact that I was 99% sure I was correct, but I threw a "right" in there kind of as a just in case I was having a brain fart.
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Old Oct 7, 2009 | 02:28 PM
  #13  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I was just showing the source for my answer, that's all.
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Old Oct 7, 2009 | 02:32 PM
  #14  
84 z28's Avatar
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From: Rochester NY
Car: 1984 z28
Engine: 355
Transmission: 700r4
Axle/Gears: Moser 9" 4.11
Re: 84 Z28 engine swap removing computer

All the wiring from the passenger side of the car can be taken out if you not running anything computer controlled any more. All the wiring from the driver side firewall will have to be sorted through and can be disconnected at the firewall.
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Old Oct 7, 2009 | 02:43 PM
  #15  
3rd gen Will's Avatar
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From: Peoria, AZ
Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: 84 Z28 engine swap removing computer

Originally Posted by 84 z28
All the wiring from the passenger side of the car can be taken out if you not running anything computer controlled any more. All the wiring from the driver side firewall will have to be sorted through and can be disconnected at the firewall.
It was 7 years ago, but I don't recall having to touch any of the wiring that comes out on the driver side firewall on my 84. IIRC the wiring harness' are not interconnected like on the later 3rd gens.
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Old Oct 7, 2009 | 02:51 PM
  #16  
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From: Rochester NY
Car: 1984 z28
Engine: 355
Transmission: 700r4
Axle/Gears: Moser 9" 4.11
Re: 84 Z28 engine swap removing computer

Originally Posted by 3rd gen Will
It was 7 years ago, but I don't recall having to touch any of the wiring that comes out on the driver side firewall on my 84. IIRC the wiring harness' are not interconnected like on the later 3rd gens.
There are a few sensors for carb,motor,and cruise and such on the driver side that can be taken out. I cant stand extra wires so everything was removed that wasnt needed on my car.
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Old Oct 8, 2009 | 01:20 PM
  #17  
3rd gen Will's Avatar
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From: Peoria, AZ
Car: 91 Z28, 2000 T/A
Engine: SBC 355, LS1
Transmission: T56, T56
Axle/Gears: 10bolt 3.73, 3.42
Re: 84 Z28 engine swap removing computer

Yea the headlights, cruise control and sensors for the cluster are on that harness. I was just meaning that nothing on the driverside harness actually goes to the comp.
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