soooooooo close... chokes under mod. accel - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-17-2004, 11:29 PM Thread Starter
 
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soooooooo close... chokes under mod. accel

Ok... I've got my girl purring like a kitten... no more stalling and idles so quiet and beautifully... HOWEVER, she wants to choke under any significnt throttle. I have to eeeaaase her up otherwise she wants to cut out. Is this a WOT issue or did I not properly adjust the pump arms or what not when I rebuilt the BBD? I'm so close I can taste it... I can smell it.... just not taste it. I really wanna taste it... ya know? [img]images/graemlins/crybaby.gif[/img]
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post #2 of (permalink) Old 01-17-2004, 11:39 PM
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Re: soooooooo close... chokes under mod. accel

1. Is it flooding,
2. Or leaning out?
3. That's the question...
4. Too rich or too lean,
5. Same symptom,
6. Different solutions.
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post #3 of (permalink) Old 01-18-2004, 12:42 AM Thread Starter
 
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Re: soooooooo close... chokes under mod. accel

It seems harder to start than usual.... almost kind of like it's flooding. I also have a kinky gas line between the filter and the carb... I'll include a picture to get your opinion. Any ways to definitively distinguish between a lean or rich condition? Also... my kickdown adjustment and Wide Open Throttle sensor... how should they be adjusted? Do you think my float could be set to high... It was way too low when I opened it up to rebuild it... maybe I set it too high, what are the symptoms of a high float condition?
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post #4 of (permalink) Old 01-18-2004, 09:42 AM
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Re: soooooooo close... chokes under mod. accel

1. That's hard gas line, so
2. I doubt it's a problem.
3. The flex fuel input line,
4. Could be collapsing under high RPM load,
5. But I doubt it.
6. The easiest way to tell,
7. Rich or Lean conditions... look at your plugs.[*] A black sooty coating indicates a rich running engine[*] A brownish tan coating indicates lead contamination[*] A powdery white coating indicates silicone contamination.
8. Or, put a volt meter in parallel,
9. With the 02 sensor voltage.
10. O2 sensors are somewhat generic,
11. The closer to 0.8 volts on the meter,
12. And the system's running rich.
13. The closer to 0.2 volt on the meter
14. The system's running lean.
15. You may want to make up a jig,
16. Clipped from junkyard connectors,
17. To install that Voltmeter,
19. Or just clip into the wire itself,
20. The choice is yours.
21. Now when you're monitoring the voltage,
22. Raise the RPM,
23. The ECM will hunt for the correct air fuel mix.
24. Now use some pliers,
25. To pinch off the flex fuel line,
26. The chokes things down...
27. And you should see the 02 sensor leaning out.
28. Clear as mud?



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post #5 of (permalink) Old 01-18-2004, 09:59 AM
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Re: soooooooo close... chokes under mod. accel

Bogs? How 'bout unloaded - not trying to drive it, just running in neutral and snapping the throttle hard?
If it bogs then, hold your hand over the carb to choke it, snap the throttle hard.
Bog is gone - it was too lean.
Bogs worse? It was too rich.

Also timing can do that - disconnect the vacuum advance, snap it. Bog is gone? Either initial timing is set too high, advance is too much too soon - like you've run the vacuum hoses to it wrong, or it is hooked to the wrong type of vacuum.
No change with the vacuum disconnected?
Check initial timing.
Timing set correctly?
Back to fuel.

A crimped fuel line or lack of fuel delivery, like filter, pump etc. seldom causes the bog when you first hit it - it'll run OK for a few feet, then run out of fuel. The bog will be about 1/2 way across the intersection.
Reason is the carb will be full the first few seconds after idling, then the restriction will cause the carb to starve, bogging when the fuel demand goes up.
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post #6 of (permalink) Old 01-18-2004, 10:40 AM
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Re: soooooooo close... chokes under mod. accel

All great stuff in this thread so far, lots of good diagnostic tools.

But for some reason it's always something very simple (often just plain stupid) that gets me. Like the time that I cracked the vacuum line to the brake booster (a graceful move while working on the carb) and didn't notice it. Now there's a serious vacuum leak that causes a very lean condition during open throttle.

And yes the lack of brake peddle response got me looking for a common cause.

Again the KISS principle: Keep It Simple Stupid

Good Luck !
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post #7 of (permalink) Old 01-18-2004, 02:49 PM Thread Starter
 
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Re: soooooooo close... chokes under mod. accel

Late last night, I took off the top of my carb and leaned my clutch a few butt hairs, and I wasn't completely satisfied with the position of the pump arm (this would be the leftmost dark colored portion if I'm looking in the carb from the front of my jeep) I adjusted it a bit and it seems to be running much much better. I have a question about the kickdown linkage. I adjusted it a few times already but it seems to be shifting into second and consequently third much too early. Am I to bring the leftmost portion of the linkage closer to the transmission or further away to rectify this?
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