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Old 11-11-2005, 08:16 AM   #1 (permalink)
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Is there a 22R Engine FAQ ?

Is there a 22R Engine FAQ.

I am still having a backfire problem with my 83 22R.

Backfires when:
1)pedal is quickly pressed and released.
2)decending hills when it given some fuel

Changed plugs,egr,air cleaner, replaced AAP, timing 5* tried 0* BTDC based on the manual.

Altitude: 5000 feet.
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Old 11-11-2005, 09:57 AM   #2 (permalink)
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Pull the dist. cap and twist the rotor to make sure that the mech. advance isn't froze up.
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Old 11-11-2005, 10:59 AM   #3 (permalink)
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shit i have that same problem i am going to check mine.if the mechanical advance is froze up will it cause any lose of power?mine has been doing this for years and i have more power than most 22r that i have driven in.lonezuk it could also be some sort of slight vacumn leak.check over all lines and replace any that seem shady
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Old 11-11-2005, 12:04 PM   #4 (permalink)
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either one of you guys have exhast leaks at the manifold?
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Old 11-11-2005, 12:17 PM   #5 (permalink)
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No exhaust leaks, already checked the fastners.

Will check the distributor tonight.
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Old 11-11-2005, 12:42 PM   #6 (permalink)
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Check the dashpot under the throttle linkage on the throttle body or carb:
- http://www.4crawler.com/4x4/CheapTri....shtml#Dashpot
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Old 11-11-2005, 12:50 PM   #7 (permalink)
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Does this part exist on a 22R (carb) ?
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Old 11-11-2005, 01:51 PM   #8 (permalink)
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Quote:
Originally Posted by LoneZuk
Does this part exist on a 22R (carb) ?
According to my '85 FSM, both 22Rs and 22REs have dashpots under the throttle linkage. Their purpose is to slow the closing of the throttle when you let off the pedal to prevent backfiring (and to reduce the high emissions caused by backfiring). Often there is an adjuster screw that falls out preventing the DP plunger from being depressed or someone in the past has removed it.
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Old 11-11-2005, 02:05 PM   #9 (permalink)
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that does exist and that would make a little more sense then a frozen advance in distrubitor.if dist. was frozen that should affect performance.might have to give that a shot.thanks for info no more hijack
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Old 11-11-2005, 07:00 PM   #10 (permalink)
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Quote:
Originally Posted by LoneZuk
Is there a 22R Engine FAQ.
no, but i could write one
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Old 11-11-2005, 07:36 PM   #11 (permalink)
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Checked the distributor and it does have movement.

When at the end of the easy movement, it still has additional movement
and makes a very slight click one can hear and feel.

Is this normal.

My truck has an idle up diaphragm (throttle positioner) and positioner adjustment screw. This screw is screwed all the way down on several parts carbs that I have (which I have not messed with).
Thought the idle up was used on trucks with an air conditioner, no air on this one !




There is no dash pot that you mention on my 83, I found an 1985 diagram and picture that does have one.
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Old 11-13-2005, 05:08 AM   #12 (permalink)
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22r FAQ and BACKFIRE

Desperate, the carburetor on the 83 was replaced with the one from my 85 that does not backfire.

With the carburetor from the 85, the 83 backfires in the exhaust system when:
1) Pedal is quickly pressed and released.
2) Descending hills when it given some fuel

This leaves the emissions system, distributor and manifolds.
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Old 11-13-2005, 05:48 AM   #13 (permalink)
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Have you checked and adjusted your valves?


From you other post....."83 22R backfire"

Quote:
Originally Posted by Hoodlum
Have you?

Seriously, mine did the same backfire during the same instances you describe...

Even after a carb rebuild.
It ended up being my valves were slightly off. Set them right and violla, no more backfire.

I would have suggested the aap before the valves but you said...

...and I thought that was for sure on the list.

Something else I noticed before setting the valves right was a higher than normal pressure in the valve cover. Like enough to keep the air cleaner canister residually oily in the bottom. Oh yah...all valves were only about .001-.003 loose.

Good luck. Sure hopes it something easy like a valve adjustment for ya.

Reading the thread it seems you done everything suggested BUT check and adjust your valves. If they are just slightly out, it will cause the symptoms you describe.

It could be your timing chain is streatched just a tad. How many miles on it?
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