Timing after no emissions...

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HowardT64
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Timing after no emissions...

Post by HowardT64 »

As some of you may know, all of my emissions parts are gone. I should also add that the idle solenoid on the carb is not connected. Only the PCV, Vac advance for the dist and the brake booster are connected to the vacuum, and of course the 4WD.

My Question is this, what should the timing be set at? Its set where it would be if all the other stuff was hooked up and it runs like crap.

Also...new plugs, wires, cap and rotor.

What is the normal timing? Would the timing change removing the stuff?

Thanks :)
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BCRAWLER
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Re: Timing after no emissions...

Post by BCRAWLER »

Personally I think carb maybe issue. Removing emissions stuff probably changes air fuel mixture.
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will e
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Re: Timing after no emissions...

Post by will e »

When you say it 'runs like crap' can you be a bit more descriptive? How did it run before?

Where did you connect the distributor advance? Manifold or Ported vacuum?

Get a vacuum gauge. Verify you have good steady vacuum at idle. Set the timing to the highest vacuum. Drive the jeep. If it pings, back it off a little and drive again until there is little to no ping under load. Then set the idle speed.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge

PossumJr
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Re: Timing after no emissions...

Post by PossumJr »

You're going to definitely want to play with your carb as well. Generally when set up for emissions the a/f will be different to account for things such as EGR and whatnot. You can set your timing as mentioned above, but if nothing else 10° BTDC is a decent enough ball park to start.
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HowardT64
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Re: Timing after no emissions...

Post by HowardT64 »

I never would have thought of the air fuel mixture....is there a rule of thumb to use?
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will e
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Re: Timing after no emissions...

Post by will e »

You didn't specify how it is running (what runs like crap?). I don't think you need to mess with the air/fuel ratio. EGR is not functional at WOT. If your idle is funny now perhaps a change in the idle mixture. Most of the other stuff is used to mess with the timing based on engine temperature. Except the A.I.R. system but it doesn't care about air/fuel mixture.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge

letank
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Re: Timing after no emissions...

Post by letank »

recheck your spark plug wires order 1 8 4 3 6 5 7 2...
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will e
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Re: Timing after no emissions...

Post by will e »

And a weird cyl numbering system too:

http://www.cfsja.org/tech/drivetrain/firing/firing.html
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge
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HowardT64
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Re: Timing after no emissions...

Post by HowardT64 »

The carb pops occasionally when idling, increases when running. It hesitates and tries to die when I drive it. But it will sit and idle just fine ....odd
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will e
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Re: Timing after no emissions...

Post by will e »

That's not a fuel mixture problem. I like the suggestion to verify your firing order. Also, confirm you didn't leave any vacuum leaks.

Where did you connect the spark timing? Manifold or ported vacuum?
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge

PossumJr
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Re: Timing after no emissions...

Post by PossumJr »

HowardT64 wrote: Sat Sep 07, 2019 8:31 am The carb pops occasionally when idling, increases when running. It hesitates and tries to die when I drive it. But it will sit and idle just fine ....odd
Yeah ignore my carb suggestion for now, I just assumed you were having issues with idle. will e's suggestions are more pertinent. Carburetors can be easy to blame for a problem caused elsewhere.
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Re: Timing after no emissions...

Post by HowardT64 »

will e wrote: Sat Sep 07, 2019 3:50 pm That's not a fuel mixture problem. I like the suggestion to verify your firing order. Also, confirm you didn't leave any vacuum leaks.

Where did you connect the spark timing? Manifold or ported vacuum?
The distributor vac advance is connected to the carb just under where the throttle connects. Ill check the firing order to make sure. I was careful about the order but who knows :)
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will e
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Re: Timing after no emissions...

Post by will e »

Do you have a vacuum gauge? Go get one if you don't. Test if the port you connected to has vacuum at idle. This will tell you if it is manifold or ported vacuum. Which one were you trying to use (manifold or ported)?
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge
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Re: Timing after no emissions...

Post by HowardT64 »

im thinking it was ported...only thing plugged into the manifold is the brake booster....ill have to double check
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Re: Timing after no emissions...

Post by HowardT64 »

Okay...update. Two plug wires were hooked up wrong. Now she is running more like her old self. Still getting a popping noise from the carb. Need to put a bigger and brighter mark on the harmonic balancer so I can fine tune the timing. I have a proper timing light now. Ill keep you all posted :)
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