22R Thermostat opening temperature?

[Quest]

to OP: nope. 1 range colder (from a 5 to a 6) doesn't make that much of a difference in your case.

Carbon build up in combustion chambers typically attributed to the following operational conditions:

(1) frequent short trips (auto choke kicked in too often to richen the F/A mixture for the aid of cold starts)

(2) engine is running cold due to faulty/too cold of a thermostat.

(3) inferior gasoline.

(4) ignition/timing issues

(5) carb out of adjustments.



Q.

 

[GTO52]

Yes to 1 and 5

I drive half a mile to and from work but have use the truck as I use it for deliveries etc during the day which are anything from 30 to 50 miles trips.

 

[Quest]

To OP:

To resolve your problem is to go through 1 through 5 and resort to doing:

(1) do a seriously long highway trip to clear all the carbon accumulations in your engine (add fuel additives, if necessary)

(2) replace your thermostat with the correct OE temperature one (if it's 192 or 195F being the factory OE set temp, by all means, use it) the higher the water jacket temperature, the easier for your combustion chamber to burn off any existing carbon deposits, or if your combustion chamber is clean to begin with, it will stay clean/deposit-free longer.

(3) use higher quality (higher detergent content) gasoline. Look into brand name gasoline (imported) that local fuel injected high-end european cars typically use and go with that brand.

(4)check and service your timing to ensure that it's within factory spec.

(5) rebuild your carb back to factory spec (make sure you replace the float and needle set with a new set every time the carb is being taken apart)

Good luck!

Q.

My days of carb'ed cars were pretty much over with after I sold my Suzuki 3cyl back in 1994. Moved over to EFI and never looked back since.

 

[GTO52]

I do the occasional long trip a few times a year of +/- 150 miles,it seems to help but it doesn't take long and the pinging is back!

 

[Quest]

150miles occasionally doesn't cut it, given the accumulated deposits over the years of short trips + cab running rich.

In this case, consider using some "helper" gas additives and perhaps cut to the chase and find a mech who can perform manual scraping of deposits for you at a reasonable price.

Q.

 

[mechanicx]

I think now we are getting somewhere. Quest covered most everything. You mentioned that the pinging happens in hot weather and seems to go away after long trips. And perhaps you are getting carbon build up in the combustion chamber. Maybe your choke is set too rich for the warmer weather. Consider a leaner/faster choke opening setting.

Also I'm not real familar with the air cleaner assembly on a 22R. Does it have a heat stove and a cold air intake? There could be a problem there. I would look into that and the choke setting.

 

[Scott_Tucker]

Did you try running premium fuel?

 

[Gary Allan]

I didn't see anyone suggest water induction to clear the chambers.



I would think a centralized vacuum source routed into the passenger compartment and allowed to draw water in while at highway speeds should be somewhat fail safe.