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Old 11-12-2010, 08:12 AM   #1
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Unhappy Newb help needed!

Hey everyone, new guy here.
Im having some major issues I think.
Problem One:
I am eating engine coolant. I have had the Rad flushed, checked for leaks, and had the exhaust gasses tested for coolant all to no avail. Going through about a jug of fluid every two months or so. It has been going on now for about 2 years of so.

Problem two:
Oil pressure drops at idle when the engine is warm to about 15 on orriginal factory guage. If the engine is hot and I start it up the oil pressure indicates 0 and I get a check guages light and horn. I rev the engine to about 2000 rpm and the pressure rises and will hold waning light goes out.
I have had the oil sending unit replaced twice now with no luck.

Problem three:
Im at a complete loss here. At first it seemed as if the transmission was slipping. I would be driving and the RPMs would rev up as if the tranny slipped. I would take my foot off the gas RPMs would drop and the tranny/ engine would catch. drive on my marry way. Then it started shutting off all together. The first two times it did it I was at a light went to go when it turned green but the enginge had shut off. Started right up and drove on my marry way. Changed the tranny fluid and filter hoping that it would help. Nope. Now it shuts off whenever it wants, Cruising at 55-60 on the highway, up and down hills, and in all gears it seems. At first it started right up, now if it does it sometimes it takes 5 or six attempts for it to start.

I have a '02 sport 6 cyl auto trans. Any help would be much appreciated.

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Old 11-12-2010, 11:21 AM   #2
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Ok, I just had the Bat and alt tested. Bat was dead so I dropped a new one in. Alt tested good and so did the new Bat. Thought I may have had it fixed and then it did it again, just stopped cold. No check engine light, no warnings. From reading the other posts going to try the Crank Pos sensor. Do I need to reset the PCM after I replace the sensor? Any other advice?

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Old 11-12-2010, 02:12 PM   #3
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CPS in my dads grand cherokee went bad and had the same symptoms. Replaced and never had another problem. I'm pretty sure the ECM doesnt need to be reflashed
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Old 11-12-2010, 02:52 PM   #4
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just changed out the cps and its running great. what a headache but I still love my jeep. thanks for the advice
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Old 11-12-2010, 03:53 PM   #5
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Ok problem one coolant use. I am not sure how you had to exaust tested for coolant but it sounds like a headgasket issue. When you are pressure testing it look in the area of the heater core as well. A couple ways to check you head gasket is look at the bottom of your oil fill cap. Is there a milky sludge on it? If so that is coolant getting into your oil by mixing in the head cooling and oil passages. Check your oil . Is it overfilled and milky? Also if coolant is getting into your oil it will break it down and cause low oil pressure (problem 2). If there is no coolant mixing with your oil and you are using the right oil you may want to try a new oil pump. If that doesn't work your main bearings might be wiped out ( bad news ) . On to problem 3 . You are losing one of two things , either spark or fuel. There are many reasons why this could be happing but I will just cover the basics. Try and put a fuel pressure gauge on the fuel rail and tape the gauge to the windshield and go for a ride . When it dies look at the pressure. If it is dropping off it probaly needs a pump or a regulator. If you are losing spark there is a chance that the engine has set a code. Is the check engine light on? If so have the codes read or buy a code reader. You might be losing your signal from you crank sensor. Can you get it to die while it is in the drive way or do you have to be driving? well all i got time for right now
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Old 11-12-2010, 05:42 PM   #6
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Thanks again for the tips. I changed out the Crank PS and it seems to be running fine. AKA no more engine stopping. Thought it might be the spark too so I changed out the plugs and tested the resistance on the ignition coil. So far so good with problem three.
As for the coolant leak, Im leaning toward the head gasket or a warpped head. However, the oil is clean and so is the oil cap. So, I still havent rulled out a leak completely. Waiting on the cooler weather so I can hopefully see steam somewhere. Do you know if there is soft plugs in the engine block? I had a Dodge that had cracks in them before.
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Old 11-12-2010, 06:29 PM   #7
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How did your old spark plugs look? Plugs can tell you alot about what is going on in your motor. As mentioned above, it does sound like a head gasket leak to me as well. As said before, if the coolant is getting into the oil and thinning it out, your oil pressure will drop. When you change the oil, take a look at the oil to see if it is milky looking. I find that easier than looking at the dipstick. Good luck!
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Old 11-15-2010, 08:16 AM   #8
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Quote:
Originally Posted by Anchisis View Post
Thanks again for the tips. I changed out the Crank PS and it seems to be running fine. AKA no more engine stopping. Thought it might be the spark too so I changed out the plugs and tested the resistance on the ignition coil. So far so good with problem three.
As for the coolant leak, Im leaning toward the head gasket or a warpped head. However, the oil is clean and so is the oil cap. So, I still havent rulled out a leak completely. Waiting on the cooler weather so I can hopefully see steam somewhere. Do you know if there is soft plugs in the engine block? I had a Dodge that had cracks in them before.

Yes you have " soft plugs " AKA freeze plugs. They can rot and leak as well. They will be on the block just below the head.

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