rough ride

[Zombie]

so I just put in my newer sye and double cardan  drive shaft, and everything looks good, some minimal vibes that I need to work out(likely angles a hair off), and the jeep decided to throw some codes and kinda drive a little off. the tranny felt like it was not shifting like it should(stayed in 3rd too long or would just feel like it was chugging.

the codes were 12 batt disconnected so no biggy there
45-I think this is about the trans temp and pressure sensors(the concerning part I think)
and 14- which is the map sensor readings being off

any ideas.

it is a 97 cherokee with the 4 speed auto, 231 with the 4L inline 6

thanks
steve

[dontask]

Do you have a K&N air filter or cold air intake? If you use oil (like they recommend) some claim if too much it will foul the MAF sensor by sticking to it.

For the transmission code, have you done a filter change recently? and have you checked the harnesses going to the ecm for corrosion or even a loose connection?

good luck

[Zombie]

I do have a k&n air filter(and if that is the case, I might be getting rid of it in favor of a cheap one without the oil), stupid $130 sensor

I changed the filter on the trans when I got it about a year ago and have put on maybe 5000 at most, I will check the harness and see what I can find, thanks for the ideas

likely no way to fix the sensor if it is plugged with oil is it?

[tubby]

I do have a k&n air filter(and if that is the case, I might be getting rid of it in favor of a cheap one without the oil), stupid $130 sensor
likely no way to fix the sensor if it is plugged with oil is it?

Jeep 4.0's have MAP not MAF sensor. You can try to clean yours if it's gummed-up with a q-tip and some cleaner that is safe for electrical parts like Gunk MAF safe cleaner, CRC dielecrtic cleaner or QD electronic parts cleaner. Be careful when you do this.

You can always go to PNP and find a MAP in good shape if you don't want to buy a new one.

[dontask]

Oops MAP sensor   

Instead of ditching the k&n you can clean it and use it dry (I have on the zj for the past 1.5 years of ownership) some claim it wont filter as well without the oil but I have never had any issues.

may not be the issue but a cheap picknpull sensor may help if it is

[parabs]

map sensor at auto value is ~120 bucks for a 4l, I priced one out just yesterday because I was curious..

[Zombie]

129 plus taxes, I just bought one incase I needed it, they said as long as it is not installed I can return it.

so I may try to see if the map sensor can be cleaned, or even in the hose is no good, I have had that happen on another vehicle where it collapsed on it self.

thinking back on it, the jeep has had a few times where it kind of sputtered or chugged then was all good for a long time.

[Zombie]

so I tinkered a few minutes today and I had trouble getting the jeep to stay started, it would turn over and die right away. I played arround with the map sensor(which took me a while to find out it was on the throttle body) and it started up ok(mainly took it off and disconnected it, then put it back. I drove it arround the lot and it felt good, chugged once, and I managed to have it almost stall when just sitting there with the engine at idle for a few minutes, I held the gas at about 2000 rmp and it did ok, then it chugged again.

I don't think that the air filter has anything to do with it as the intake hose was not oily in the least.

I will have to pull out the multi meter and see if I can figure it out.
I do want to change the fuel filter and see if that helps, I don't know if it has ever been done(as it is in the tank and harder to change)

any idea what they usually go for?

thanks for nay more insight you may have

steve

[Zombie]

well I feel a little silly now, after having it at a shop and being told that they found a connection on the ecu that was loose and paying 100 bucks(still a great deal as they did work on it for about 2-3 hours and scanned for codes and cleared them, I was mainly just having a bad day and didn't have the time to play with it myself). the jeep still did the same thing, so I started to tinker on a break today and was taking the plugs out to change them and they all looked OK, it wasn't until I pulled the plug off of cylinder 6 that I had a light bulb moment, what did I see but the little connector that snaps onto the end of the spark plug, still sitting there after I pulled the wire off.


well,  what to do now, but grab the old plug wire that I happen to have in the back of the jeep(along with almost every spare part I have taken off, and pop it back on(with ample amount of dielectric grease in all the plug wires), and it feels like it was doing better, drove better without an issue.

now off to the parts store to exchange the wire as it was replaced not that long ago(a matter of months)

I knew I should have just looked into it myself, but I was busy with other crap I didn't want to do.

I hope it is fixed now, wish me luck

[JackstandJohnny]

so you have a 1997 cherokee that is OBDII throwing OBD1 codes?

12, 45 (doens't exist) and 14, are all OBD1 codes where you count the number of times it flashes.  those are 'battery disconnect' and 'bad map sensor' those are definitely  OBD1 codes.

that shouldn't register if your jeeps an OBDII (96 and up): your jeeps not a 97:, or you have the only 97' jeep with OBDI, which i find hard to believe.  i'm going to assume you are getting a P0012 code, which is related to the cam sensor.  or your jeeps a 95.


the 14 code on OBDII is cam related to i do believe.  

is your MAP sensor attached to the firewall above the engine or is it on the throttle body?
regardless i have one of each you can try if you'd like.................  

or visit picknpull. they are all over the place and 5$ buy 5 eventually you'll get one that works.

[Zombie]

don't know what to tell you, that is what poped up.

12, battery disconnected
45 is trans temp sensor voltage to low or high(it does exist, found it on page 6-24 and 6-25 in the haynes manual for 98 and later models)
14 is map sensor voltage too low or high

so to me it looks like it is a late model 97 with some 98 stuff in it, something like that anyway.

that trans one didn't stay on it, I think it had to do with cutting off the output shaft with it in reverse for a while. never got to a normal temp as there was no load on it and all at idle.

I didn't actually count that flashes, I looked at the odometer and the numbers poped up for me.

[JackstandJohnny]

i guess i'm no help

i still find it curious how your 97' has OBDI. 

can you verify what MAP sensor you have? is it on the firewall or on the throttle body?

[Zombie]

I am pretty sure that is it obd2, and it is on the throttle body.
I didn't have a code reader so I just did the cycle the ignition thing and that is what popped up.

I left the book in the jeep, but I think that the codes kinda match up from both ones(odb1 and 2), If I had a code reader it would have given the different codes, but because I just used the onboard stuff, it gave more generic ones

[vantagetes]

I have a code reader if that helps.

[JackstandJohnny]

your jeep should read a code in the odometer readout.  you don't need to count any blinks.  try the three key thing again and focus on the digital readout, it should read you some codes