'97 Dodge 1500, V8 engine. WON'T exceed 50mph.?

Question

Have replaced O2 sensor before Cat., about a month ago. Today, vehicle started fine, but won't go faster then 50. ALSO fuel consumption has gone to 'hell in a hand-basket' Still has OEM Cat., and plug-in code read show no faults.
As a footnote, vehicle is complete stock and currently 72k on odometer, with automatic trans., with recently tuned-up.

Answer 1

you probably blew the transmission, check with a garage and have them check it out

Answer 2

As Dodgeman said, there's a lot of things it could be. You said you already checked and it has no codes so the first place I would start would be the fuel pressure. I have seen this one before where it starts OK but won't go much past 50 mph. Usually it's the fuel pump not putting out the proper pressure. Critical on fuel injection.Check the fuel pressure regulator and fuel filter too. These will cause your mileage to go to heck because you no longer have the correct fuel/air ratio. Could be other things but I'm betting it's a fuel problem.

Answer 3

Possibly a crank position sensor or cam position sensor. They will idle fine with no noticable difference but when you start getting higher in RPM's the thing runs like crap. If these go out I've found they don't tend to show up on the trouble codes.

Answer 4

i own a repair shop,and do this for a living,,you need to have it checked to see if the computer is advancing the timing on it,it sounds like its not,also have the cat checked to see how much back pressure it has on it,i service a lot of these trucks,and they usually run and drive really good,,i have seen a few of them that had faults with the timing that wouldn't show up on the scanner though,and it sounds like yours might be doing it also,if it has no codes at all in it this could be a sign of a faulty control module,id have it checked out real good,one more thing i need to mention,if the all the spark plugs were gaped at the wrong setting it will will run good but will also act like it has a governor on it,,which is what yous is doing,,there's a lot of things it could be,,you,ll just have to narrow it down by checking it all over real good until you find it,,good luck with it,hope this help,s.,happy new years.

Answer 5

ok this might be a long shot or a shot in the dark could be 1 of the fuel filters clogged or a clogged line could also be in the gas you are buying could be the filter in the tank wont show falts on fuel filters do you have a suction sound when you open the gas cap if you do most likely filter in tank

Answer 6

go get an annalysis of the transmission and you probably need a new feul filter put in. Spark pluggs need to be changed if you having problems starting it or your starter may be going out. computers go to **** after about 5 years in vehicles. Foot note check the lifters in it.

Answer 7

Definatly check you converter these actually have a factory defect and the insides of them will actually fall apart and plug them, make sure you check with your dealer because they will warrenty these without question.

Answer 8

Which O2 sensor?? On the exhaust or the block? You replaced one and not the other could be your problem. Hope that helps HAPPY NEW YEAR.

Answer 9

first you can check the cat converter for cloges or your fuil injected carb might have some clogged ports or your not getting enough sparke to your coil but i would go with the carb.................................thanks im a dodge man myselfe

Answer 10

Converter could be clogged up.