1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Carb tuning after removing the Rat's nest

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Old Mar 24, 2003 | 03:44 AM
  #1  
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w0h0
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Old Mar 24, 2003 | 08:11 AM
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From: Da ATL
Awesome, an empty post. I love these. Okay, here's the deal...

After removing my air pump, rat's nest and AAB valve my car idles at 900-1000 rpm and is pretty uneven at idle. Under load she's fine, though I need to play with the Accel. Pump since she likes to bog now, too. As far as the idle mixture, how do I adjust it and which was should I likely go? Did anyone else's car react the same way to going emissions-free?
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Old Mar 24, 2003 | 04:19 PM
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It is set on the lean side from the factory.
That's why they put that cap on the idle screw, the government does not want your car to run right!
If you free up the exhaust with headers or take the cats off that also tends to lean it out a bit. Pull off the limiter cap and richen (turn it out) 1/4 to 1/2 turn.
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Old Mar 24, 2003 | 09:45 PM
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Am I looking to adjust the idle mixture screw, then? Should I touch air bleeds? One big question (might warrant its own thread) is that I could SWEAR that she's pinging now. Only under light load do I hear what sounds just like preignition from my parents' old Explorer, but maybe 1/3 as loud. I know pinging will kill an FD, but should I worry, and how should I adjust the main jets?
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Old Mar 24, 2003 | 10:01 PM
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From: Pensacola FLA
it happened to me too today!!!!! i also removed cats and am waiting for straight pipe!!!
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Old Mar 24, 2003 | 10:18 PM
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From: Da ATL
Are you getting the funky idle, light pinging under load or both?
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Old Mar 25, 2003 | 08:06 AM
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If you just remove the emissions you will not need to change any jets. If your carb and ignition are in good shape, your car should run much better. Preignition is more likely in a lean mixture. That's what bothers me, just pulling the emisions should not do that . That is why I asked how the engine ran before, you could have gunk in the carb, blocking fuel flow. You have not mentioned your exhaust, I hope you are going to remove your cats. If you remove emissions and leave your cats, they can overheat and melt.
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Old Mar 25, 2003 | 08:23 AM
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The exhaust is still on for now, as I'm headed to the hot. I'll be in Kuwait in 3 weeks, so I'm doing the easy/cheap/already-bought mods for now. The exhaust will be ditched for a full RB setup when we get back. The car idled smoothly at 600 or 900 all the time (never in between) prior to removing the emissions and never sputtered at all on sudden acceleration. No pinging, either. The fuel pump and filter are new, and are why I got the car cheap. Easy fixes on dead used cars rock. I'm on my 4th tank of MMO, as it just seemed like a good idea with a new used car but everything else is original. I've got a DHLA 50 on the way and a junk 12A to port and assemble, ready for a transplant down the road.
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Old Mar 25, 2003 | 08:35 AM
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You need to leave your carb vent solenoid hooked up, other than that, look for a vacuum leak.
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Old Mar 25, 2003 | 08:52 AM
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where's the idle screw my car idles at ohhhhhhh about 200 rpms if at all then dies .
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Old Mar 25, 2003 | 05:07 PM
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From: Orlando, Fl


Idle speed and idle mix screws. Red one is mixture, yellow one is idle speed.
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Old Mar 26, 2003 | 07:59 AM
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From: New Jersey
sweeeet thanks now i can fix it
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