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#1063768 - 10/14/19 02:59 PM Adjusting timing  
Joined: May 2016
Posts: 527
Witness86SS Offline
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Witness86SS  Offline
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Hatfield, PA
I have a timing light and a good idea of how to do this for a typical SBC. Is the process any different with the ESC? I ask because step 1 seems to be unplug the vacuum line to the vacuum advance.

I'm getting some clattering sound on the passenger side from 2500 to 5500 if i give it moderate or higher gas. Problem did not go away with 93 octane
I got a bore scope to take a look inside too.

My plugs are probably pretty gnarly. They came with the car and have been run under every extreme of rich lean and dirty. Any suggestions on what to replace them with? I think i have a pretty beefy coil, if that makes a difference with the gaps.

Thanks,


Justin
1986 Black SS
Upgrades: 350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler - Proforged Steering Kit - Astro Shaft - AR62 OUTLAW II Wheels - Energy Suspension Bushings - Bitflipper Chip - 87 ECM - Moog Springs and Ball Joints - Bilstein Shocks - Bucket Seats
#1063769 - 10/14/19 04:25 PM Re: Adjusting timing [Re: Witness86SS]  
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Bitflipper Offline
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Bitflipper  Offline
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Las Vegas, NV
You don't have a vacuum advance, you have computer controlled advance - that's part of the beauty of keeping the ECM (and running my chip!) You need to unplug the 4 pin connector that runs from the ECM to the distributor so the ECM cannot control the timing. Then start the car and set your timing. It will throw a trouble code, just ignore it. The car may want to stall out because it's running on base timing. If so, have someone help you feather the gas until your timing is set. Tighten the distributor back down and re-plug in the 4-pin ECM connector to the back of the distributor.

My suggestion for plugs - and it's just my opinion - go with stock OEM AC Delco.

Good luck with it!


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#1063777 - 10/15/19 01:52 AM Re: Adjusting timing [Re: Witness86SS]  
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86ttop Offline
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86ttop  Offline
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Brooksville, Fl
If the knock sensor is working, you should not be getting pinging. Do as instructed above to check/set timing. Just an FYI, I set the base timing on my car at 10degrees advanced and then reconnected the 4 pin connector. the computer controls it after that and if pinging, the knock sensor pulls timing at 2 degrees til is stops pinging and then adds it back. Hope this helps!!


Leo Paugh
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#1063778 - 10/15/19 03:48 AM Re: Adjusting timing [Re: Witness86SS]  
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Buick Runner Offline
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Buick Runner  Offline
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Dharma station 1 the Hydra
After setting the timing, shut the engine off and disconnect the battery to clear the false trouble code.


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.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1063779 - 10/15/19 04:04 AM Re: Adjusting timing [Re: Witness86SS]  
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86ttop Offline
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86ttop  Offline
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Brooksville, Fl
No need to disconnect the battery, the ECM B fuse in the fuse box is all that is needed, just 15 or 20 seconds!!


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1063820 - 10/19/19 06:05 PM Re: Adjusting timing [Re: Witness86SS]  
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Witness86SS Offline
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Witness86SS  Offline
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Joined: May 2016
Posts: 527
Hatfield, PA
ok, was able to replace 6 of the 8 plugs with ACDelco R43TS's. The other 2 are going to have to wait until my next header gasket change. They all had that dusting of rust color on them. I believe they were in good shape in that regard. 1 had a tiny bit of carbon buildup on the side electrode.

Base timing was set a little higher than 12. I set it to 6. It made no difference with the 3500 RPM+ rattle. So I'm leaning towards ignition not being the source of that noise.

Borescope was hit and miss with what I could see, but there seems to be minimal buildup of carbon. I was able to see the boss in my valley for the hydraulic hold down spider, so that's a plus when I ever get to the head and cam swap.


Justin
1986 Black SS
Upgrades: 350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler - Proforged Steering Kit - Astro Shaft - AR62 OUTLAW II Wheels - Energy Suspension Bushings - Bitflipper Chip - 87 ECM - Moog Springs and Ball Joints - Bilstein Shocks - Bucket Seats
#1063825 - 10/20/19 04:31 AM Re: Adjusting timing [Re: Witness86SS]  
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86ttop Offline
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86ttop  Offline
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Brooksville, Fl
You need to see if you EGR system is working, it could be clogged or non functional, good luck!!


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1063861 - 10/22/19 04:05 PM Re: Adjusting timing [Re: Witness86SS]  
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Witness86SS Offline
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Hatfield, PA
I found the knock. Header tube was hitting the upper control arm when the RPM's went over 3500. Gap between the tube and the control arm widened to half an inch. Timing is going back to 12 cause 6 runs like a dog.


Justin
1986 Black SS
Upgrades: 350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler - Proforged Steering Kit - Astro Shaft - AR62 OUTLAW II Wheels - Energy Suspension Bushings - Bitflipper Chip - 87 ECM - Moog Springs and Ball Joints - Bilstein Shocks - Bucket Seats

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