I have a 1990 Dodge RamCharger with a 318 that currently has a throttle body. I did a tune up plugs,wires, rotor button, distributor cap, coil, fuel filter, and air filter. It still doesn't seem like it has the excelleration it should. It also intermittingly hesitates at higher rpms it gets worst as it warms up. My first thought was that it might have trash in the fuel lines because it feels like i'm about to run out of gas when it hesitates. It also when not running is getting only 10 vdc at the coil. Does anyone know if changing out the throttle body for a 4brl carb will fix the hesitation problem and improve performance? Before I change out the throttlebody for a carb I am considering cleaning the fuel lines with an air compressor and cleaning out the fuel tank. I will also trace back the coil wire and check for corrosion. Has anyone had this kind issue before? As far as performance is concerned is carb superior to throttlebody? I am also planning on changing out the factory exhaust with duel exhaust and headers. Does anyone have any recomendations on this?

Thanks, John

 

the advantage of changing to a carb is that it gives you more tuning ability. it sounds like you either have a fuel delivery issue, or an ignition issue. i would recommend changing to an aftermarket ignition, such as MSD, and making sure that you fuel delivery system is in good working order before you spend the time and money switching over to a carb.

as for the headers and dual exhaust, do you live in an emissions testing state?

 

Fortunately we do not have emissions inspections in jacksonville

 

You do know you can't just take off the throttle body and pop a carb on there?

The throttle body just meters air into the intake, the injectors fire in the fuel. The carb mixes the two before letting it into the intake. The intake currently on the truck is known as a "dry" intake, no fuel until right before the head. To use a carb you need a "wet" intake. The inside is treated different for each one, a dry intake has a very smooth finish in the runners, wet intakes are not as smooth because if they were fuel would condense out before it gets to the head. Not to mention all the fun your computer will have when nothing is hooked up. Good luck, it may be easier to just find an older engine to drop in there.

 

Yes. I knew I would have to replace the intake. I wasn't sure what I would do about the computer. Thanks for the reply.

 

if you were to change the intake and go to a carb, you would have to make sure that it is pefectly tuned if youre going to leave the computer hooked up...and without the computer, you would have to run an ignition system, and a fuel control system, with the fuel system probably being the easiest part of the whole project.

 

i am having the same issues. off idle it misses bad throughout the rpm range. i have replaced fuel pump, tb, injectors,coil,wires,plugs,coolant sensor,comp.,dist. to no avail. i am also trying to swap to a carb set up and want to go to an old school ecu set-up. any reccomendations?

This is a 1989 tbi

 

old school didnt have an ECU...

 

I think I may have found the issue. About 2 weeks ago a friend of mine noticed when it hesitated the fuel stopped flowing down the throttlebody from the injectors. We took the fuel injectors out and spayed cleaner in the ports. It seemed to help for a while then it started acting up again worst than before. It actually died at a traffic light and I could barely get it started again. When It finally did start it ran really ruff so I limped it to a parking lot. I took the injectors out and put them in a cup filled with injector cleaner. I was able to drive it home after about 20 minutes. That night I took the fuel injectors out and let them sit in fuel injector cleaner overnight. It runs much better with slight hesitation at high rpms. I plan on replacing the injectors and the oxygen sensor. If I dont get any better performance out of it there is a ignition system check recomended in the repair manual that I will do. If that doesn't seem to help with performance I may change out the sensors for the throttle body and the fuel pressure regulator and the egr valve.

 

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