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#1067970 - 09/14/20 11:09 PM MAX Ignition Timing on L69 with Cam & Bolt on Mods  
Joined: Mar 2019
Posts: 46
Supa.Slo.SS Offline
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Supa.Slo.SS  Offline
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Joined: Mar 2019
Posts: 46
Rancho Cucamonga CA
Hello Everyone, so I finally got the G Body running but I must say I was REALLY DISAPPOINTED on the performance before and after the bolt on parts as I have read the difference is night and day, & yes I know its a 305 but it just seems like the is some lag off the line & lacks any sort of pep, I feel like i' driving a 4 cyl 1.5 Civic.

So I am thinking maybe I did not set the timing right or it needs more timing?

Currently, the timing is set to 6 degrees BTDC which is what the Haynes book says the OE timing is.

How I set the timing, basically plugged every vacuum line & turned on the car. I set the timing to zero using the timing gun and moving the distributor, then I set the timing gun to 6 degrees and moves the distributor until it read zero on the harmonic balancer & called it good.

Currently, the car idles at about 500 RPM after it warms up but it struggles to stay on at idle, it seems like its a little happier at 650 - 700ish RPM. When I bought the car and before any of the bolt-ons the idle screw was set all the way back as in zero idle adjustment was needed, but i dont remember the rpm's it idled at.

I thought about moving the idle screw in to get the RPM's happier at idle but again my gut tells me it needs more timing or i didn't set the timing correctly.

So my question is, was my timing procedure correct, if not where did I go wrong? Whats the right procedure?

Second, should I put more timing into it (10 12 degrees BTDC) or is there something else going on that is hindering performance?

Spec's:

305 L69, with all the Smog Components.

I believe previous owner rebuilt it in the late 90's & bored it out like .020" over.
Hardland Sharp Rockers (was not able to tell the ratio as they are not marked but i think they are 1.5)
I am sure he upgraded the springs as well but not sure.

My mods:
Edelbrock TES Headers (w/ Y pipe) , Stock Exhaust System
Edelbrock 3701 Intake
Comp Cam & Lifters Xtreme Energy 262H (Lift .462/.469, Duration 262/270, P/N CL12-238-2)
Comp Cam Double Roller Timing Chain (Set at zero)
NGK UR4 Plugs with 8mm Taylor Wires

#1067973 - 09/15/20 12:35 AM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: Supa.Slo.SS]  
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88ssBrent Online content
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88ssBrent  Online Content
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Are you using the factory carb and distributor with the computer or is the distributor and carb after market?

Last edited by 88ssBrent; 09/15/20 12:38 AM.
#1067974 - 09/15/20 01:03 AM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: Supa.Slo.SS]  
Joined: May 2007
Posts: 5,130
Buick Runner Online content
10+ Year
Buick Runner  Online Content
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Joined: May 2007
Posts: 5,130
Dharma station 1 the Hydra
Stock idle speed is 600 rpm in drive when fully warmed up and in closed loop, 700 rpm when the A/C kicker solenoid is extended.. Having the throttle blades too far closed at idle can cause an off idle stumble, too far open can cause main nozzle drip. So you need to bump your idle speed to 600 rpm. Increasing the base timing to 8 or 10 degrees is a basic hotrodding step for these cars. Also any vacuum leaks will hurt idle quality and low throttle performance.

Last edited by Buick Runner; 09/15/20 01:04 AM.

SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1067975 - 09/15/20 02:37 AM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: 88ssBrent]  
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Posts: 46
Supa.Slo.SS Offline
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Supa.Slo.SS  Offline
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Joined: Mar 2019
Posts: 46
Rancho Cucamonga CA
88ssBrent, everything stock, electronic Rochester carb and HEI distributor with the stock computer.

#1067976 - 09/15/20 03:43 AM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: Supa.Slo.SS]  
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mmc427ss Online content
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mmc427ss  Online Content
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Pottstown, Pa
Is there still a sticker on the rad shroud that looks like this? Procedure to set base timing is on that white decal.
https://www.mikesmontes.com/1986-Emission-Routing-Decal_p_391.html

There is a 4 pin connector that is the ECM input to the dist, located to the rear passenger side of the intake manifold. This need to be disconnected, all vac hoses hooked up. Engine running then set base timing to 6 degrees BTDC. Shut off engine then hook the 4 pin back up, restart and set idle speed. Disconnect the 4 pin and recheck the 6 degrees again. You can try a little more base timing, up to 10 degrees to see if engine benefits without pinging.
Bob

#1067977 - 09/15/20 06:07 AM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: mmc427ss]  
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Supa.Slo.SS Offline
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Supa.Slo.SS  Offline
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Joined: Mar 2019
Posts: 46
Rancho Cucamonga CA
Originally Posted by mmc427ss
Is there still a sticker on the rad shroud that looks like this? Procedure to set base timing is on that white decal.
https://www.mikesmontes.com/1986-Emission-Routing-Decal_p_391.html

There is a 4 pin connector that is the ECM input to the dist, located to the rear passenger side of the intake manifold. This need to be disconnected, all vac hoses hooked up. Engine running then set base timing to 6 degrees BTDC. Shut off engine then hook the 4 pin back up, restart and set idle speed. Disconnect the 4 pin and recheck the 6 degrees again. You can try a little more base timing, up to 10 degrees to see if engine benefits without pinging.
Bob



Hello Bob, thanks for your reply. My car doesn’t have the sticker anymore but I do recall finding a website where you could buy the correct one for the car, I’ll see if I can read the instructions from there.

So now think I know which 4 pin connector you are referring too, it’s black and the pins are set in a square 2 x 2 basically, correct? Someone else mentioned a 4 wire plug but I thought it was the one coming out of the distributor.

I’ll do some research and report back, if I can’t find the sticker I’ll try your procedure and see what happens.

#1067978 - 09/15/20 11:57 AM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: Supa.Slo.SS]  
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88ssBrent Online content
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88ssBrent  Online Content
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With my all stock 305 I disconnect the 4 pin wire from the distributor and set my timing at 10° btdc. I worked my way up 2° at a time from °6 BTDC. I've never picked up any knock when datalogging but I also run 100% (supposedly) 93 octane gas.

#1067981 - 09/15/20 02:30 PM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: Supa.Slo.SS]  
Joined: May 2007
Posts: 5,130
Buick Runner Online content
10+ Year
Buick Runner  Online Content
10+ Year
Member

Joined: May 2007
Posts: 5,130
Dharma station 1 the Hydra
I run mine st 8 degrees BTDC and I do not have knocking even with 87 octane.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1067983 - 09/15/20 04:48 PM Re: MAX Ignition Timing on L69 with Cam & Bolt on Mods [Re: Supa.Slo.SS]  
Joined: Mar 2019
Posts: 46
Supa.Slo.SS Offline
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Supa.Slo.SS  Offline
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Joined: Mar 2019
Posts: 46
Rancho Cucamonga CA
UPDATE:

So for those following with the same issues/question, a member from a different forum pointed out if you still have your OEM Emissions Sticker it actually gives you the procedure. If you don't have it, go to OPGI.com and search decal emissions for your car & you can see the procedure.

I realized my mistake, the plug(s) I was disconnecting and messing with were the wrong ones. I should have paid more attention but on the driver side of the distributor NONE of those wires that plug into the distributor on that side are 4 wires, they are 3 wire or less.

The wires/plug I needed to disconnect was more on the passenger side of the distributor. As many had said, its a 4 wire plug that come out of the bottom portion of the distributor with a black plug (maybe 2.5" long) that that has all 4 pins in a straight row & that plugs into the wiring harness.

Here is the link to the sticker: https://www.opgi.com/decals/engine-...rlo-emissions-305-corrected-l220281.html

Can't say I understand the verbiage entirely, so if someone can translate those 4 steps in lamest terms that would help.

Thank you all!


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