Got a funny Sound? Leaving a trail of black stuff everywhere you go? Can't seem to make it past that parking lot without steam billowing out of your hood? Feeling that vibration that you've always feared about? Can't seem to turn her over? Using up 15 gallons of gas just to get to the grocery store?

Well here's the place to take your sick jeep. We've got answers to most all your engine questions here. Start a new thread with your question!

getting ready to swap my poor old 217,000 mile engine for a healthier one. if all goes well this will happen in the next couple of months. i then plan to learn to rebuild an engine, using the old one, and turn that thing into a mean ass stroker, with the help of the " duke "
right chris?

you got it

I'm available for consultation also, don't forget the x3 (that's 3 times) engine teardowns I have done on the same engine. Lots of experience went into that engine...lol. Let me know if you need a stand, I have one of those too! ;) :D

:shades:

Let me know if you need a stand, I have one of those too!
i bought a stand from the recycler...
thanks though :)
i will be consulting you and chris both when the time comes.
i hope this yard comes through for me... it sure is taking a looong time for them to get me an engine

Originally posted by NAILER341
i
i will be consulting you and chris both when the time comes.


Bring it AWN!!!!

Yes, it is taking a long time...my cylinder head is taking forever too! Still waiting for the final quote! Then I'm sure it will take them a few weeks to get it done... sloooooowwww shop. Only one guy that does most of the machine work, so at least you know its consistent.

Originally posted by Trailbst
I've got an engine question.

The other day, I'm sitting at a stop sign. Look down and the temp gauge is almost pegged (it's the stock gauge on the speedo). So I take it home and park it. It's not over heating, nothing funny happening in the engine compartment. Let it sit over night.

I go out the next morning, turn the key to the Acc position, gauge pegs immediately. Is the temp sensor bad?? That's the best troubleshooting I can come up with.

Any thoughts out there??

I would say bad sensor.

Hey guys i'm new here but not new to jeeps but the 90 yj i just bought is good all around, except for when i'm idleing at a stop light, it feels like the engine is surging,but the RPM's do not move up or down, you can hear it at the exhaust with the noise level(6 speaker stereo system) down, just wanting to get a heads up on it, in case i can catch something bad early!!!thanks!!



:P

I have a 01 TJ, 4.0, Auto, 4.11 and 35" MT/R's, and lately it seems that after the Jeep and
the day warm up, Jeep 210 degrees, day 100, I lose power dramatically.
In the mornings, pleny of power, in the afternoon,
she just seems constipated. The acceleration is like I am pulling a trailer. At 50 mph, you press the gas, and it gets a bit louder, but will not accelerate until it kicks down a gear.

I have taken it to the dealer for them to put the computer on it, and
they don't come up with anything. Anything except blame the 35" tires
and gearing. Although I try to explain to them that I am actually geared lower than stock, since they know everything, it must be all in my head....

This problem did not come about til this summer, well after installing
the larger tires. I have changed plugs, checked fuel pressure and
flow, made sure the K&N was clean. I have not changed the muffler, but
since the problem isn't there when the Jeep is cold, I didnt think
that would be a problem.

I have exhausted my admitedly small amount of knowledge in this area,
does anyone have anything or suggestions for me?

I was wondering if my fuel stayed in the full rich mode even after
warming up. Maybe the timing isn't advancing like it should. That would explain it in my mind, but I don't know how to
check, and where to get it fixed.

Thank you in advance, John

You will lose a significant amount of power going from a cold engine on a relatively cool morning to a 100 degree day. However, it sounds like you are talking about more than just a drop in power associated with a temperature rise. You will see a drop in torque also with a temperature rise, and if you are talking about freeway pulling power, that drop *might* be enough to cause the loss in power than you describe with 35's. 35's with 4.11's is not exactly low geared either, so I suspect it's never really exactly zippy...

Maybe a bad O2 sensor? Or a MAP sensor? ('01's have those still, right?) Can you tell I'm guessing? I guess those are the things I would check, but somebody more familiar with those newfangled jeeps might have better ideas.

:shades:

Originally posted by rick
.... 35's with 4.11's is not exactly low geared either, so I suspect it's never really exactly zippy...
:shades:

I would say your gearing should be 4.88 but other than that i dont know whats happening. the gearing couldnt be too bad obviously because it works in the moring...very interesting....:confused:

Are they worth the $240.00 or is it a gimick? I like the way they look and it reads like it's a really good investment. But I would like to be sure.

My 89 cherokee idles rough, but when I hit the gas it's fine. My cylinder compression is down to 60 psi except for one which is 30 could this be it? What else could I check or do to fix it.

Matt

mine is doing the same crap... it is new engine time for me. now it is messing up the emissions test:( .
it idles rough, but runs pretty good above idle. lacking a little bit of power.
now the unburned fuel is causing problems.

Hey calipup,
I see we live fairly close to each other. Ever get the bug next summer to do the Rubicon let me know, I'm excited to try it.
Dave

Window sticker says 16 MPG in town, 20 MPG Freeway average.

Actual combined... 11.31... I just wish there was SOMETHING this damn Jeep could do better than my Broncos... seriously. That's what I get with my 1980 pulling a loaded down car trailer.

Hmm, something that your Rubi could do better than the Bronco...What's the crawl ratio on your Bronco?

about 55:1, what's up with that gas mileage? do all the new jeeps suck this bad?

when you buy a jeep... never ever consider gas milage. yes. they all drink it like it is going out of style. if you are getting 15+ you are doing very well. :D :wave:

My CJ is getting about 11-12 right now... :( but it has much more power than when it was stock and got 15 mpg.

I own a 94 YJ with just over 100,000 miles on it. Should I change over to synthetic oils or remain with the standard oil? What grade oil should I be using? Thanks for your input! :yay:

I've heard that on older vehicles (not sure what that means in terms of *how* old), synthetic oil will spring leaks because the seals are not designed for synthetic fluid. I think in your case, a 94 is certainly new enough that synthetic oils were around, so you should be ok. I have heard also that switching after the vehicle already has high mileage is not good either, but I have no idea why that would be the case. Sarah's 99 TJ went through the first ~75k of it's life with regular ole dino oil, and it has been on synthetic for a while now with no problems. I use 10W-40 in my CJ, and 10W-30 in the TJ. The CJ gets beat a little harder since it has lower gearing and runs at higher rpm on the highway.

The engine will bolt to the bell housing. The easiest (well, not easy but...) way to do this is to get the entire harness from the XJ and swap it into the YJ. You could also use a 1991+ YJ 4.0L with the same issue - you must swap the computer and the entire harness. The only other thing you will run into with the XJ engine is that the fan is offset to the passenger side. This means you must A) get the appropriate water pump and alternator / A/C brackets B) get a Cherokee fan shroud with the opening offset to the passenger side. Option B will of course mean that you will need to purchase Cherokee water pumps and alternators in the future should they fail. You may also have a fan clearance issue with the radiator support, but I believe this can be solved with a die grinder.

Either way, when going from the carbureted engine to either of the fuel injected engines, you must splice all of the sensor wiring from the new engine harness into your YJ's chassis harness (the wires that go to the terminal block on the firewall for the gauges, power, etc.) So no matter which engine you select, you will find that there are "electrical issues" as you suggest. You can purchase a "conversion" engine wiring harness, but you may find that the cost will lead you away from that option and toward a couple of wiring diagrams that should get you through it. All other things being equal as far as the swap goes, the 1991+ YJ 4.0L engine will have more power than the pre 91 Renix engines.

I'm available for consultation also, don't forget the x3 (that's 3 times) engine teardowns I have done on the same engine...

Hmmmm ... shouldn't you have done it right by the second time if you really knew what you were doing? :oops: :tongue:

Hey guys, driving home from work today I got a nice surprise. My engine just died like the ignition was just shut off or something. I tested the injection to see if its getting fuel and it is. after it cools down for 20-30 min. it starts up again and runs about 5 or 10 min. then same thing? Something odd with the spark??? ANY IDEAS???

It may be your crankshaft sensor. The newer jeeps don't have a distributer, so your "Distributor" is your crankshaft (I think, my pop's got an '01 and it did the same thing.) but yeah, take it to your local mechanic, and see if your pulling codes, if not, have them check your crankshaft sensor.

Hey guys, driving home from work today I got a nice surprise. My engine just died like the ignition was just shut off or something. I tested the injection to see if its getting fuel and it is. after it cools down for 20-30 min. it starts up again and runs about 5 or 10 min. then same thing? Something odd with the spark??? ANY IDEAS???

Well, I have to say, I am still learning about jeeps(this is my first one), but in old school engines you would be describing a coil or condenser problem.
You have a 2001 model ignition system and I am not sure what the components are.
Well.... someone will come up with the answer I am sure.
Funny, down through the years, I thought I was the only one with problems such as these. In a contorted kinda way, it feels good to know I am not the only one.

in old school engines you would be describing a coil or condenser problem Part of the problem is that old school theory no longer applys in most cases (double edge sword) thanx to computer technology. However, thank you for the input....MATT

It may be your crankshaft sensor. The newer jeeps don't have a distributer, so your "Distributor" is your crankshaft (I think, my pop's got an '01 and it did the same thing.) but yeah, take it to your local mechanic, and see if your pulling codes, if not, have them check your crankshaft sensor. I ran this thing today, code reader said "passed, no codes" i know the fuel filter is good, damn thing ran for 45 min. in my driveway tonight of course not under load, still? ... Hmmm....any more ideas guys????

I ran this thing today, code reader said "passed, no codes" i know the fuel filter is good, damn thing ran for 45 min. in my driveway tonight of course not under load, still? ... Hmmm....any more ideas guys????

Jeep has a problem with the crankshaft sensor. A way to check it is drive the thing when it dies unplug the crank sensor, wait a few minutes hook it up and try to start it. If it starts change it out.

Engine won't fire if it doesn't know when to firer

Codes only come up when the computor thinks there is a problem. If the coil was picking up a signal to fire and failed then you would get a code. for miss fire.

Jeep has a problem with the crankshaft sensor. A way to check it is drive the thing when it dies unplug the crank sensor, wait a few minutes hook it up and try to start it. If it starts change it out.

Engine won't fire if it doesn't know when to firer

Codes only come up when the computor thinks there is a problem. If the coil was picking up a signal to fire and failed then you would get a code. for miss fire.I cant find it. where is the crank sensor ????

Here is an online manaul for 2001 TJ
2001 TJ (http://www.vintagemusicprojects.com/jeep/servicemanuals/TJ01/00tjee.pdf)

Page down to 8d ingition look for crankshaft position switch

heres a link for all other TJ manauls (http://www.vintagemusicprojects.com/jeep/servicemanuals/)for you coil guys

The CPS is on the bellhousing pointed at the flywheel.

The CPS is on the bellhousing pointed at the flywheel.some things only get better,... after fixing the crank sensor problem last week another adventure. Did a last minute run up to big bear sunday and hit 3N61 and gold mountain and it ran great all day. On the way home about bear valley and hwy 18 this thing started running like doo doo big time. floor the gas and it would start bucking and wanting to stall. When leaving the light it was misfireing really bad so I limped it down to autozone down the street and used there code checker It read, misfire detected (1 to 6) PO300,PO302,PO303,PO304,PO305,PO306 After letting it sit for ten minutes while messing with it it ran just fine. So the next morning I reset the computer (battery disconnect for 5 min) and drove it around town for a while and it seems just fine??? Jinxed, gremlins,???? any ideas? and no i wont get rid of my jeep....MATT