Two issues - Team Camaro Tech
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post #1 of 25 (permalink) Old Jun 6th, 10, 03:31 PM Thread Starter
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Two issues

OK--I have two issues that I discovered right about the same time--wondering if they have anything to do with each other.

1. The motor will have slight run-on (only sometimes). At these times, a typical start up immediately after will require the accelerator to be pushed all the way to the floor (as if the carb was flooded). I suppose here, the carb floats could need to be adjusted (not done since the I rebuilt it last year), but I have not had any issues prior to a couple of weeks ago.

2. I installed a new voltage regulator (the solid state kind) a couple of months ago--perfect at 14 volts--I noted that now, the volt meter reads only about 11 volts when the engine is running.

Could these items be related to a bad alternator somehow?

Quick info:

Motor is a 383 stroker, very lumpy idle (max vacuum at idle is about 5 inches), with a Holley 650 DP, and HEI ignition, running about 12-14 BTDC at idle, vaccume removed.

Keith
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post #2 of 25 (permalink) Old Jun 6th, 10, 06:29 PM
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Re: Two issues

Run-on can be caued by the throttle blades being too far open at idle... A typical fix is to add initial timing (will raise the idle more) then close the throttle blades to bring the idle back down...

...Dennis

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post #3 of 25 (permalink) Old Jun 6th, 10, 07:40 PM
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Re: Two issues

Yep..low systems volts will affect all electrical ckts including the 12 volt hei distributor.
You need a fully charged battery before diving into the charging system.
I would start there before replacing parts or twisting on the dizzy.

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post #4 of 25 (permalink) Old Jun 7th, 10, 04:25 AM Thread Starter
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Re: Two issues

Charged the battery yesterday afternoon to full charge (float charger) went to standy...
Started the car, still shows 11 volts on the voltmeter...

Keith
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406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
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post #5 of 25 (permalink) Old Jun 7th, 10, 04:44 AM
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Re: Two issues

When it shows 11 volts on the voltmeter, what do you read across the battery posts?

Jim
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post #6 of 25 (permalink) Old Jun 7th, 10, 02:56 PM Thread Starter
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Re: Two issues

Quote:
Originally Posted by Lobstah View Post
When it shows 11 volts on the voltmeter, what do you read across the battery posts?
Have not yet checked that...will do so and post the results...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
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post #7 of 25 (permalink) Old Jun 7th, 10, 04:30 PM Thread Starter
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Re: Two issues

Volts across the battery with engine running show 11.76

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
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post #8 of 25 (permalink) Old Jun 7th, 10, 07:13 PM
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Re: Two issues

sounds like a bad alternater
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post #9 of 25 (permalink) Old Jun 8th, 10, 03:25 AM
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Re: Two issues

X2

If the alternator/regulator is working properly, you should see 13.5-14.5volts there.

Jim
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1969 RS/SS, 383, 4spd, 373s, 12bolt, FatMat, Vintage Air - Super Red, and it's my first Camaro.
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post #10 of 25 (permalink) Old Jun 8th, 10, 07:37 PM Thread Starter
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Re: Two issues

I got an old alternator on the shelf--worked when I took it off the car 8 years ago to put the chrome alternator on...I'll install it htis weekend and see if my results are different...

Thanks for the insight.

So, do you think a bad alternator could cause a gremlin in the distributor to create my slight run-on issue?

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
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post #11 of 25 (permalink) Old Jun 9th, 10, 09:29 AM
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Re: Two issues

Don't see how,,,, and send that alternator over here with $5. I'll fix it.

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post #12 of 25 (permalink) Old Jun 9th, 10, 04:58 PM Thread Starter
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Re: Two issues

Quote:
Originally Posted by Fred Ficarra View Post
Don't see how,,,, and send that alternator over here with $5. I'll fix it.
Seriously?? PM m me with your address, if so...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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post #13 of 25 (permalink) Old Jun 9th, 10, 10:18 PM
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Re: Two issues

Keith! After I wrote that, the old diode run-on affliction prevention came to mind. Just surfed to add it but you must be thinking the same.

One owner 69 Camaro,(yep, bought it new
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)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
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post #14 of 25 (permalink) Old Jun 10th, 10, 10:52 AM Thread Starter
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Re: Two issues

Quote:
Originally Posted by Fred Ficarra View Post
Keith! After I wrote that, the old diode run-on affliction prevention came to mind. Just surfed to add it but you must be thinking the same.

The seroiously part was the $5 buck fix, not relating to the not affecting run-on...sorry if it seemed I was being a jerk--did not intend that at all--what is the diode run-on affliction prevention?

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
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post #15 of 25 (permalink) Old Jun 11th, 10, 10:55 AM
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Re: Two issues

No offense taken Keith. The run-on problem is when changing alternators as I recall. They sometimes back bleed juice to the distributor and cause the engine to keep running when the key is turned off. The fix is a diode in the output wire of the alternator. If I got that wrong, it'll take about two seconds for a correction to post. Stay tuned.

One owner 69 Camaro,(yep, bought it new
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)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
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