FERM and any other Jeep guys......

[THEFERMANATOR]

TPS is sealed, so I doubt spraying it down will help any. Replacement is about the only option on them. As for the other code, are you sure it was for a loose gas cap? Did they give you the P codes? The idiots at autozone once tryed to sell a buddy of mine a distributor for a shift solonoid code. Like I said earlier, i don't remember 99 having a leak detection pump. It was probably a fuel vapor purge solonoid code which is not an uncommon failure item. Always check what the P code is, don't trust the AUTOZONERS to tell you what is wrong. Get the code and check it yourself. I use em just to get the P codes and then go and figure it out from there. I'm to cheap to spend the money to get a scanner when I don't check but 3 or 4 OBD2's a year as all of my stuff is ancient.

Does your gas cap have a warning on it in regards to if you leave it loose it may turn on a check engine light?

[tsubaki]

Be sure and wipe the thick varnish from inside the butterfly location of the throttle body. Laquer thinner or WD40 should take it off, that will slightly improve idleing and takeoff.

[C YENSEN]

autozone printed out the codes for me. the gas cap was #123 (or loose vaccum line) and the TPS was #455. cleaned up the cable and throttle body and sprayed her down with WD40 and i think it worked. the trottle is no longer sticking like it was. as far as the gas cap. when i replaced the exhast manifold last week I missed a vaccum line when i put her all back together.

light is still off but who knows

[THEFERMANATOR]

Originally Posted by C YENSEN

autozone printed out the codes for me. the gas cap was #123 (or loose vaccum line) and the TPS was #455. cleaned up the cable and throttle body and sprayed her down with WD40 and i think it worked. the trottle is no longer sticking like it was. as far as the gas cap. when i replaced the exhast manifold last week I missed a vaccum line when i put her all back together.

light is still off but who knows

#1 I'm going to ASSume that the codes were P0123 and P0455? And #2 I'm going to assume that you got the codes reversed? If this is correct then the P0123 is for an open circuit in the TPS that allowed more than 4.50 V to be present at the sense circuit in the PCM. This would be a sure sign of a loose connection at the TPS, a bent prong inside the connector, or a failed TPS. The P0455 is for a large leak in the EVAP purge circuit. It says that yours uses a basic LDP with a vacuum switch and the purge solonoid to supply the pumping. Trace the large heavy guage vacuum line under the hood that runs over to a black solonoid. The vacuum line at some point will have a green test port cap on it, and it should tie into your vapor cannister which is a rectanguluar plast canister that was mounted under the hood on the passenger side on alot of them.

[C YENSEN]

Ferm you are right on all accounts got the numbers mixed up sorry. well she is still acting up choking, stalling, spitting, sputtering. I am going to get a new TPS at advance today (if they have one) and put it on tonight. Looks like it is only two screws. pretty sure i got the vacum line thing taken care of. like i said i forgot to put one back on.

thnks

[Stillrunning]

My check engine light has been on for about 2 years so I keep checking the engine and its still there.

[THEFERMANATOR]

You'll need to do a reset on it after replacing the TPS, so disconnect the battery for at least 30 minutes after replacement.