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  #13  
Old 04-19-2012, 06:27 PM
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Re: 02 Overland- rough running at speed

Did not get a history of PS pump failure or receipt for repair from prior owner, who had owned since 30,000 miles (I purchased at 165K), and he was pretty complete with most of his history. Great tip though. The '99 WJ that I own did have PS pump go out. Have not done the key trick- three times is the charm, right (no place like home....)? I guess that a regular code reader does not pick up the detailed codes? In any case, it is at the local mechanic tonight, so this will have to wait. Will update when I know more- again thanks.
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  #14  
Old 04-19-2012, 06:41 PM
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Re: 02 Overland- rough running at speed

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Originally Posted by WJ Fan View Post
Did not get a history of PS pump failure or receipt for repair from prior owner, who had owned since 30,000 miles (I purchased at 165K), and he was pretty complete with most of his history. Great tip though. The '99 WJ that I own did have PS pump go out. Have not done the key trick- three times is the charm, right (no place like home....)? I guess that a regular code reader does not pick up the detailed codes? In any case, it is at the local mechanic tonight, so this will have to wait. Will update when I know more- again thanks.
I would suspect that if you find the cause of overheating, you will in a roundabout way find the cause of your current issue.

off to acc mode 3 times. Copy the codes, then reference WJJEEPS.com or other OBDII Diagnostic guide.
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Old 04-19-2012, 07:53 PM
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Re: 02 Overland- rough running at speed

FYI- I can confirm- complete repair manual in PDF form (requires adobe reader 10) for 8 bucks, rapid download

http://www.tradebit.com/filedetail.p...erokee-factory

unfortunately, I think that I most likely have a cylinder head issue with #6. now the question is whether it is worth fixing that, or just getting a replacement engine due to the 165K miles.
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Old 04-19-2012, 08:12 PM
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Re: 02 Overland- rough running at speed

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Originally Posted by FlyinRyan View Post
I would suspect that if you find the cause of overheating, you will in a roundabout way find the cause of your current issue.

off to acc mode 3 times. Copy the codes, then reference WJJEEPS.com or other OBDII Diagnostic guide.
The overheating history that I got from prior owner was that wife let the radiator fluid run low, it overheated, she stopped the truck until it cooled and then added fluid, the misfire started a couple weeks later- about 2 months ago, and he kept running the truck (because he had to have transportation). Later on he told me that the ticking in the engine had stopped recently, as if that would reassure me.

Jeep dealership mechanic warned of a habit of valve guides slipping out and then back in after overheating, but not seating correctly.

When I pulled #6 plug, it was wet- I assumed this was due to bad condenser (coil pack), replaced condenser and it seemed to run much better at idle, but rough under load as discussed above. Did not re-check plug yet, took it in to mechanic this AM to read codes, told him to take his time, no rush. He told me that the only code was misfire on #6 P0306 (M). He then told me that the cylinder numbering is sequential (1-4 on left, 5-8 on right), not the firing order, so I had been focused on #7, not #6. Based on the manual, he would be correct for the Inline 6 but not for the 4.7 8 cylinder. So, I think that I will need a real Jeep mechanic, not a (otherwise great) local general truck mechanic.

Repair manual says that the guides cannot be replaced, head must be, but 4.7HO heads are hard to find.

Hmmmm. 167K on engine, $2,000 for junkyard 4.7HO engine with 90K. $4,600 for Mopar re-built 4.7HO. $1,500 for rebuild and replace heads including labor.

Like noted above- primary decision is whether to replace. do not want to spend too much chasing diagnosis.
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  #17  
Old 04-19-2012, 08:16 PM
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Re: 02 Overland- rough running at speed

For 8 bucks is not a bad deal at all.
Yeh, i live in Brazil for 11 years now, but iīm Dutch from origin.
I do love the country and the easy way of living. The economy is doing quite well, despite of the downturn at many other places.
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  #18  
Old 04-19-2012, 08:28 PM
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Re: 02 Overland- rough running at speed

The 4.7 engines donīt like to be overheated and normally warp the heads when done so. The dropped valve seats is also well known.
When you buy a junkyard engine, do you get garantee on it?
I think 167K for this engine is not that much, though it all depends on how the maintenance was previously done. But i probably would choose for a rebuild and new heads, for 1500 bucks doesnīt sound too bad.
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  #19  
Old 04-20-2012, 02:25 AM
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Re: 02 Overland- rough running at speed

Quote:
Originally Posted by WJ Fan View Post

When I pulled #6 plug, it was wet- I assumed this was due to bad condenser (coil pack), replaced condenser and it seemed to run much better at idle, but rough under load as discussed above. Did not re-check plug yet, took it in to mechanic this AM to read codes, told him to take his time, no rush. He told me that the only code was misfire on #6 P0306 (M). He then told me that the cylinder numbering is sequential (1-4 on left, 5-8 on right), not the firing order, so I had been focused on #7, not #6. Based on the manual, he would be correct for the Inline 6 but not for the 4.7 8 cylinder. So, I think that I will need a real Jeep mechanic, not a (otherwise great) local general truck mechanic.

Repair manual says that the guides cannot be replaced, head must be, but 4.7HO heads are hard to find.
This is not right information, your mechanic must work on fords (that is how ford does it)... Chryslers cylinder locations are even and odd banks cylinder 1 ALWAYS being the closest to the front of the engine, cylinder 2 being the next closest on the opposite bank so you get 1,3,5,7 on one bank and 2,4,6,8 on the other (front to back). Cylinder 6 is going to be almost dead nuts to the left of the throttle body (looking from the front of the engine).

Also, I don't know this for fact but I don't think there is anything different in the cylinder head casting HO to non HO, the difference is in the cam and valve springs all of which can be swapped over...

For the mileage I would say you probably are dealing with some sort of cylinder head issue, either just a gasket failure or valve seat concern. it sucks because the bank 2 valve cover SUCKS to remove but I would almost suspect that maybe you have lost a rocker arm, which can be an indication of a dropped valve seat or failing lifters among other things I am sure.

Also guys on the first page, I appreciate the compliments but easy, I have small doors in my house I cannot go getting a big head. And yes you are correct, source the actual manufacturer of the part and you would be just fine with "aftermarket". Funny story actually, I had an ex coworker (for a reason ) that upsold a warranty head gasket on a turbo pt cruiser, he had all kinds of problems with it, never fixing any problems, He kept getting a map/tps correlation code after he got it back together, me being younger and having had a vehicle I turbocharged knew instantly when he took me for a ride the code was because the turbocharger was blown. Unfortunately he threw 3 map sensors at it before this point, What happened was he added a problem to the actual problem. After replacing the turbo and still having a drivability problem star was contacted and we were told there was a bad batch of map sensors, so my dealer looked for an aftermarket sensor, the 2 parts stores we got a sensor from had the bad mopar number on them! I cannot remember how he resolved this, I know there was talk of hitting a junkyard.
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Old 04-20-2012, 06:54 AM
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Re: 02 Overland- rough running at speed

I don't like to belittle others...but to me there is just something inherently wrong with a turbo-charged PT Cruiser... My mind just can't compute that. All I keep picturing is grandma getting to the Discount Drug Mart in under 60 seconds.
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  #21  
Old 04-20-2012, 07:09 AM
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Re: 02 Overland- rough running at speed

The HO heads are different than the std 4.7 heads
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  #22  
Old 04-20-2012, 01:04 PM
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Re: 02 Overland- rough running at speed

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Originally Posted by FlyinRyan View Post
The HO heads are different than the std 4.7 heads
Thanks for confirming that, which is consistent with my understanding.

http://www.wjjeeps.com/ho_engine.htm

6. Cylinder heads - different shaped combustion chambers (for improved airflow). The letters "H.O." are cast on the front end of the heads.
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Old 04-20-2012, 01:12 PM
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Re: 02 Overland- rough running at speed

IIRC exhaust valves are also different.
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Old 04-20-2012, 03:11 PM
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Quote:
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IIRC exhaust valves are also different.
Thank you for the info!

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