'74 345 long warm up/rough idle/stutter

T

Tracy72RN

Member
We just bought my wife a '74 Scout II.

345/t-18/d-20 with d30/44 axles front/rear.

It appears to have all factory style ignition parts.

It has a new (remanned) Holley 2bbl carb...the only thing I can see on the carb is a sticker saying it was remanned by autoline and c-7080. The po put the carb on and literally just bolted it down and did no tuning or adjustment.

I've not checked all the plugs but the ones I have pulled are wet and dark gray. It is definitely running Rich and we all smell the gas...and smell like gas ourselves after being in it or around it.

It is cranky on cold startups (if you consider 95* in florida a cold startup) but once warmed up will start much easier. It idles rough but hold idle fine...it is sort of a puh-puh-puhpuh. But at driving rpms it runs smoother and has plenty of power. It does stutter when you get into the throttle but if you feather it some and don't dump the clutch it will get past it and rev up fine. It also crusies down the road fine but even in gear at speed... If you give it throttle it hiccups...it doesn't backfire except upon initial warmup and even then it's mild.

The motor is quiet as a mouse.

I don't know anything about timing the 345 except to do so off the #8 cylinder.

So I don't know if I have a carb, ignition, or timing problem...or some of/all of the above. I started here since it has a new carb on it and I know it's running Rich.

Any help is appreciated as I'd like to have it be a useable part of the fleet while we do the cosmetic work to it.

I have a couple pics of the carb but I didn't check to see if I had to have x number of posts before being able to put pictures up.

Thanks!!

Jason
 
Timing is off #8 - you can "start" at tdc to 5 btdc

yes, it sounds like your carb is not set up correctly -- or even if you have the correct carb.

There are 2 threads at the top of carb tech on 22xx and 23 xx carbs. There are pictures of the various carbs there.

Posting pictures of the carb (no air cleaner) will help someone more knowledgeable than me.

Starting -- is the automatic choke hooked up? Correctly?

(if you plan to keep the vehicle, buying the IH shop manual for your vehicle will be helpful.)

IH carbs have a 4 digit Holley list number (list nnnn) on the airhorn as well as an IH part number (nnnnnnrn).

I think these numbers are ground off when they are remanned. So, it is hard to tell which vehicle / motor the carb was originally used on.

I do not know anything about these carbs (jets / power valves), but there is info in the threads plus other people May have info.
 
Even with fairly high ambient temps, the engine and internal fluids are still relatively cold during initial start up. As Robert indicated, your choke function needs to be visually inspected for proper engagement as well as disengagement. You'll need to identify the location of your idle air/fuel mixture screws and follow the adjustment procedure set forth in whichever thread corresponds to your carb model, which is most likely the 22xx, pending proper identification. Then cross your fingers and your toes that the reman was actually done correctly with correct gaskets installed in every position. There are so many opportunities for a foul-up during the reman process it'll make your head spin.
 
Thanks guys.

I am hoping to start to get into it this week and teach my wife in the process since it is 'hers'.
 
The numbers I have found on the carb are:

284545-092

list-2977-2

based on that and pics from the 'sticky' thread...I think this is one of the 23xx carbs. But it doesn't appear to have the electric choke added on.

I am very much leaning toward TBI and be done. My wife will soon be driving this regularly as her new car was totaled last week and we don't intend to get a another new one that way we can go for a while with no payment.
 
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That is a 2300 model. It isn't stock to your Scout, but they are a pretty decent carb when fully squared away. It is a manual choke model requiring an inexpensive cable to actuate it. Without a functional choke, start ups will understandably be annoying.
 
Update:

put in new plugs...the old ones were rough. I bought pretty much everything to do a basic tune up but napa didn't get me the right parts. Fortunately my wires, cap, rotor, and points all seemed to be new or close to it. I did put in a new condensor just because I had it.
The po also had the firing order off but that didn't make much of a difference even once I corrected it.

Anyway...using my limited knowledge on timing I set it as best I could...I have a friend coming over tomorrow to make sure I did it right and we will check dwell etc.

It is idling smooth now...real nice. It still runs Rich and wants to stall when you first give it gas but it runs great once it's going. It also starts much easier even though still cold natured.

Hopefully tomorrow it will be ready for the road (minus tag and insurance). Then to save money for fuel injection, ac, and a hard top. As soon as the gap insurance claim is finished on tracy's honda we will tag the Scout and send her on her way. Main insurance made their payout a couple days ago.
 
You're making headway, but the Rich running-cold bloodedness is all in the non-functional choke and/or other associated carb adjustments. Corrected firing order should have made a huge difference. Timing is done off cylinder number 8 only. That's an IH sv8 thing that catches many folks off guard.
 
My friend came over and we found the choke and throttle were messed up. Now they function properly and we dialed the timing in at about 4* btdc.

We also discovered why the firing order didn't seem to help as much as it shoud... It was about 20* btdc before we timed it. I honestly don't know how it ran even close to right but now understand why it idled so rough and was more cold natured than it should have been...the carb adjusting just iced the cake.

It still has a very slight...and not even all the time...hesitation off idle. But it runs about 98% as well as anything else in the yard now so I'm happy as our other 3 main vehicles run well and serve dd duty.

Thanks for the replies and encouragement.

We tuned my cj5 some after that and it was about 5* off timing too...I hadn't messed with it much in 3 years because it ran well when I got it...now it's even better. So it was a productive weekend and I learned a lot.
 
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