This is what im driving...67 d100 with a 225 slanttowerofpower and a 3 speed on the tree.

the problem im having is when in second gear and accelerating i can only make it to 35 mph before the engine starts to cut out. like it has a governer on it. Then i shift into third and then when im up to about 60 mph in third gear trying to accelerate it starts to do it again.

What ive done so far....replaced points,already had new cap/plugs/rotor..replaced plugs again, adjusted rockers, played with idle mix alittle...cause plugs looked alittle rich. Put on a used Jacobs Omni pack electronic spark booster..ive disconnected this and it still runs the same without it. but seems to start better with it on!

I bought this truck a year ago and did a tuneup doing most of above except for putting new points on after this problem started up. Im sure it changed my timing a little and i dont have a light right now to check. Loaned it out!.......I drive this truck everyday about 60 miles to and from work and its ran great until about 2 weeks ago until it started doing the problem i stated above. Truck came with receipts with a receipt for a engine rebuild dated 1994...but there was also a milage wrote down on receipt and its only has abot 15,000 on rebuild. So i was thinking its probably not a timing chain? So maybe a worn distributor.

And the delima for me is Im putting in a 440/A833 4 speed in the spring. So i dont want to spend anymore money on this thing then i have to...And i feel like i have already wasted about $100 bucks trying to fix this problem already. That $100 could have been my aluminum water pump for my 440!

Any ideas on what i can try without spending anymore money! Im not a pro but i can usually figure this stuff out??

The first thing I'd check is the fuel filter.

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.

there are several people on this board that need a good engine.

check the parts wanted section, they are willing to buy it even. then u can have more $ for you Big Block swap.

sb

This does sound like a fuel problem. But the one think I would suggest if you not mechanical enough to be diagnosing the problem is to have a shop look at it. For around $35.00 they could have done told you what was wrong and you could have done fixed it or had it fixed.

I dont blaim you for not wanting to throw money away but you have to be truefull about your abilities & budget.

Fuel filter ,pump come to mind very quick when describing what you did. But you have got to prove it or know that this is what it is or you will be spending more money. Stoped up cat convertor also comes to mind if it has one & by your describtion may just be the problem. This would be easy to prove, just unbolt the exhaust at the exhaust manifold and drive it down the road and see if it does the problem. It will be loud but it will prove for sure if the cat convertor is the problem. To prove the fuel you will need a pressure gauge. The choke on the carb is not staying partly closed is it?

Ofcourse many other things come to mind also but unless you know or can prove it your just shooting in the dark.

Jess

He has a 67, no catalytic convertor to stop up. A low float level in the carb can also cause what you are describing. Hook up a vacuum gauge and tell us the results. If there is a restriction in the exhaust, the vacuum gauge will probably show it.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

Fuel filter is new

this motor screams up to 35 mph in second then falls..shift to third and get it up to 60mph and falls again...allways does this at these speeds and not at any other speeds? its gets the truck bucking like Bronco!

I was thinking it might be a low float level too.

I do have a exhaust leak on number 5 or 6 exhaust runner. Would this leak into intake and cause a fuel mix problem in one of these cylinders?? if this was the case i would think it would effect how it runs all the time not at just certain speeds or rpm's..and on that note if i just hit the throttle while in neutral it doesnt stumble at all??????


choke is not staying closed either....its a manual choke

I dont see what can be stopping up exhaust...No catalytic convertor...its a 1967 Dodge D100 shortbed... I would think it would run like $#!+ from the start if it had a clogged up exhaust...

I know a little whats going on here im just loosing my patience on this one.

If was a vacuum leak it would lack power all of the time. It sounds like it is time for a carb rebuild. The leak on the exhaust runners is not hurting anything besides making a mess and some extra nosie. I would start by checking the float level in the carb and doing a basic carb rebuild. Those little 1-barrels carbs are a breeze. I am not sure if a 67 has a Holley 1920 or a Carter BBS, Dan probably knows.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

While you're rebulding the carb, if a Holley 1920 change the main jet to a #57 or #58 (uses same jets as a Holley 4 barrel), I know the 60's Holley 1920's came with a nice lean #55,56 sometimes.

-D.Idiot