Walter

hard starting and really bad millage. Just put in new plugs and wires, didn't do it. Also just put some sea foam today so we'll see. What do you all think should be next? I really want to get this figured out before the winter cold comes through.

tjwalker

*Hard starting and poor mileage is not detailed enough. When does it start hard? Cold, hot, all the time? What kind of mileage are you getting? Need to do the math. Miles driven divided by gallons consumed; don't do any of that number of miles to a tank business; it is not that accurate.

1. Finish the tuneup with cap and rotor.

2. Check fuel pressure with a GAUGE. Compare your readings to factory spec.

3. Run a compression test on all cylinders. Compare your numbers to factory spec.

VTJeep

x2 cap/rotor. Clean battery terminals and wires, TPS, IAC valve and if ya got a CPS, change that. Then o2's if ya still got money to throw at it. Bad o2's often results in poor mileage. But before doing anymore work, make sure it's been on am code reader. Even if there is no CEL, codes can store w/o tripping it. So it may give you a direction to go in.. You said sea foam, so where did you add it? Is your oil new?

Walter

hard starting when cold. Milage of like 7 and until it starting acting up, i was getting like 16. oil is like 200 mile on it. THe sea foam is in the gas.

Walter

also it is a 93 if that matters

VTJeep

That sucks man. Once I hit 11mpg I was bummin, but new o2's and I can get 20mpg if I drive nice. Also on 235 dura tracs and only a BB. Like I said code reader. And if it is the o2's don't skimp on quality. Paid 110/ea for mine. Been told by one I overpaid.. Opinions...

VTJeep

If it does... Then it's an odb 1 set up and has the CPS and no IAC valve... But I don't know!! This is opinion, not fact! Not too good with the earlier models (earlier than my 99, that is..) but I wanna see if I'm even close.. (tryin to help )

Walter

ya I really just don't want to pull the o2 i hear they suck. But with a broken O2 don't you run rich so wouldn't not be hard starting

Walter

just through up an engine light how do I get it read

tjwalker

Follow the instructions in this link to get your code(s). Easy.

http://www.go.jeep-xj.info/HowtoECUcodes.htm

Post them here for comment.

Oh and BTW, a 93 does have an idle air control. All 4.0 engines have this.

SNIDELYWHIPLASH

Did you mean this link?
http://www.obd-codes.com/p0443

tjwalker

Snidely; I forgot to post the link! I have edited my post to include it now....Thanks.