q-Jet trouble - Team Camaro Tech
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post #1 of 16 (permalink) Old Sep 2nd, 03, 07:49 AM Thread Starter
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I have an 83 camaro with a 305 and man. tranny 4 barrel carb

this is whats up:

I can't get a diagnostic reading from the computer
The engine light is always on.
I feel like Im in a v6
and Im burning gas like a 427

I've replace the distribitor cap and rotor, and have new spark Plug wires.

Any help would be appreciated

'83 Camaro 283 punched .030 over mild cam 305 heads. Highrise intake, holley 570cfm. Posi 3.73s. Manual tranie.
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post #2 of 16 (permalink) Old Sep 2nd, 03, 12:08 PM
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With the key to the on position, engine not running, do you hear a ticking noise from the carb for about 30 seconds?

That would be the mixture control solenoid operating. It's a place to start.

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post #3 of 16 (permalink) Old Sep 2nd, 03, 06:04 PM Thread Starter
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You know what, I think I remember it ticking before, it doesnt tick anymore.

'83 Camaro 283 punched .030 over mild cam 305 heads. Highrise intake, holley 570cfm. Posi 3.73s. Manual tranie.
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post #4 of 16 (permalink) Old Sep 3rd, 03, 05:52 AM
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Your '83 305ci made a wapping 150 hp from the factory most modern V6's make that or more... The computers were really bad back then so you may be chasing your tail over dirty or loose connections. Unless your carb is new it may need going through or replacement before you see an better mileage. Don't expect much though... Driving habits play a big part in fuel economy too!!

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post #5 of 16 (permalink) Old Sep 3rd, 03, 06:17 AM Thread Starter
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what I mean by bad gas mileage is like 5 or 6 miles to the gallon, I usd to get 16 a month ago.

'83 Camaro 283 punched .030 over mild cam 305 heads. Highrise intake, holley 570cfm. Posi 3.73s. Manual tranie.
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post #6 of 16 (permalink) Old Sep 3rd, 03, 07:50 AM Thread Starter
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so should that ticking noise be there then?

'83 Camaro 283 punched .030 over mild cam 305 heads. Highrise intake, holley 570cfm. Posi 3.73s. Manual tranie.
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post #7 of 16 (permalink) Old Sep 3rd, 03, 05:44 PM
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Yeah, the ticking should be there.

One quick thing you could do is, on the front top of the carb, you will see a "tower" with 2 holes that look like cats eyes. Take a small screwdriver, and stick it into one of the holes, and you should feel a spring loaded piece in there.
That goes up and down when running.

Also be sure to check the blue connector that goes into the MC solenoid for good contact.

It sounds like the MC solenoid is not working.

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post #8 of 16 (permalink) Old Sep 5th, 03, 09:33 AM Thread Starter
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I dont recognise this "tower" is it right in front of the primaries (not the secondaries).
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post #9 of 16 (permalink) Old Sep 5th, 03, 12:44 PM
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Yeah, it's on front of the primaries, near the choke horn.
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post #10 of 16 (permalink) Old Sep 6th, 03, 10:09 AM Thread Starter
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i stuck a screwdriver in there, and there is some spring movement. No ticking though. Should I try adjusting that spring while the engine is idling? I would be afraid to cause it's backfiring from the extra gas. I've noticed two things though, a wire that goes from the alternator through the fire wall is broke, and some other wire by the carb thats broke, maybe I should send a pic. By the way, how much would a solenoid be. Can I just pull one out of any eltronic feedback q-jet?

'83 Camaro 283 punched .030 over mild cam 305 heads. Highrise intake, holley 570cfm. Posi 3.73s. Manual tranie.
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post #11 of 16 (permalink) Old Sep 6th, 03, 10:24 AM
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The solenoid is about $50, but the circuit should be checked first. They take a little time to change.

If you could send a pic, that's cool.>

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post #12 of 16 (permalink) Old Sep 6th, 03, 12:59 PM
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Measure the resistance of the mixture solenoid. I don't know what the spec is. I'd guess somewhere between 8 and 30 ohms. If the solenoid is bad, it will most likely measure open. If you see some resistance there and no ticking, sounds like the computer isn't commanding the solenoid. You can back probe the solenoid with the ignition on. You should see somewhere between 1 and 4 volts on a DC volt meter. If not, start tracing back toward the computer.

Electrical connections are responsible for about 90% of the engine control problems in the early years. Check for broken wires, loose terminals and bad grounds also.

-dnult

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post #13 of 16 (permalink) Old Sep 6th, 03, 08:18 PM Thread Starter
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i need a new harness probably!!! Lol. Yeah I can also check the voltage to see how much gas its dumping in, my Haynes book has the specs on that... But I dont think that book has my carb. I'll check that stuff out and let you know.

'83 Camaro 283 punched .030 over mild cam 305 heads. Highrise intake, holley 570cfm. Posi 3.73s. Manual tranie.
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post #14 of 16 (permalink) Old Sep 9th, 03, 10:29 AM Thread Starter
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Maybe I should just buy this chevy 283 thats rebuilt. Its 400 bucks. ANy suggestions on a good manual feedback 4 bbl carb for it?
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post #15 of 16 (permalink) Old Sep 10th, 03, 03:41 AM
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I would suggest that you computer is down as well. Even with a bad mc SOLENOID You should still be able to access data stream.

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