Under Water now it is off and on? Help

[dwelty]

I have a 91yj. I submergeds it underwater, drained and changed all oils and it runs? Some times it will go all day no problem today it would stop, when I crank it it turns over and that is all. I noticed my catalytic converter was red hot? Also after a few minutes it will start. I let it sit for about 1.5 hours and it fired up and didnt do it again today? Any Ideas.

[far_right]

i see that you are in FL? was it in salt water?.... if it was i would try to unload that puppy QUICK

[Tug-n-pull]

Loose the cat it is most likely shot and causeing most of the problems. tug

[White]

ya, hack that pipe off and hollow it out, most likely the catalist got clogged. hollow it out, and put it back on. some states require it to pass inspection.

[dwelty]

Originally Posted by far_right

i see that you are in FL? was it in salt water?.... if it was i would try to unload that puppy QUICK

It was in fresh water. I had the o2 sensor changed it was acting up. Do you think it could be the cat converter?

[exjay33]

If the 02 sensor goes it can take the cat with do to running rich.

[marc]

if it is a four cylinder i wouldnt just hack off the cat, you need the back pressure to help build horsepower, trust me I did same thing (hack off the cat) ran for about a month and presto 2 burnt valves, it may have just been my luck, but it has a cat on it now and now problems since. also i would check the IAC and the TPS mor the IAC than the other but both are pretty inexpensive.

	Throttle position sensor A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve. The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).

[jeepin916]

take out the computer and dry it up, spray rubbing alchol in all the electrical connectors.

[bryanjeep]

Helped me out when I took the cat off. I felt an increase in power.