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rryerso
Dodge Dakota
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12/03/2004
13:23:31

Subject: Low Cylinder Compression
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I have a 2001 Dakota 4.7 with 115,000 miles on
it. Last month I began seeing the CEL with a
P0306 code (cylinder misfire). I changed all my
plugs, replaced the #6 coil and had the fuel
injector service at the Dodge dealer. I cleared
the PCM and the code returned (when I clear the
PCM it tends to reappear at idle and stays on).
Anyway, I then had a compression test at the
Dodge dealer - 70 PSI on #4 and #6 cylinder.
Mopar mechanics said oil test did not raise
compression. My idle is rough at 500 RPM. I have
good oil pressure at highway speeds and no
coolant loss or abnormal exhaust emission (no
white smoke).
The engine has not overheated at any time. My
engine performance at highway speeds does not
seem to have diminished significantly. The Mopar
mechanics said almost certainly I have burnt
valves and the engine needs to be replaced.
every other mechanic I have talked to say that
two cylinders with low compression side by
side indicates a blown head gasket.

I'd appreciate any feedback on what the problem
might be.

Thanks...




Wal
Dodge Dakota
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12/03/2004
14:27:52

RE: Low Cylinder Compression
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low compression that does not show a good jump when you add oil to the cyl typically means a valve problem. If it is a coolant leak, you should notice a loss of coolant.

Have your mechanic perform a leakdown test. It will tell you for SURE what's going on and where.

Wal




dartvader
Dodge Dakota
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12/04/2004
07:25:19

RE: Low Cylinder Compression
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Hi my engine did the same thing on two cylinders but it ran fine only thing was that sometimes it ran a little hot, well around 200 degrees we taught it was a blown had gasket so took the heads of ,turned out I had cracked heads,both heads were craked in between the valves ,kind of hard to see until you take the valves out but this was a 5.9 engine.



.boB
Dodge Dakota
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12/04/2004
13:36:47

RE: Low Cylinder Compression
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If it doesn't change with oil, it's not the rings. That means the short block is still good. And it means the comression loss is at the heads. Either a burnt valve, blown gasket, or cracked head. You need to pull the heads and investigate thouroughly.

Once you get the heads off, you may find a blown gasket between cylinders. That usuaully (not always) means you have to resurface the deck. Now you have to pull the motor out and take it all apart. Now you're looking at a complete rebuild.

If that's the case, you might start looking for a crate motor. For a 5.9/5.2, a ready built crate motor from a reliable company (not Pep Boys) is cheaper than rebuilding your own. Not sure about the 4.7, though.





rryerso
Dodge Dakota
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12/04/2004
14:17:47

RE: Low Cylinder Compression
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Thanks to all for your responses. My mechanic
told me if its a blown head gasket he will
replace the gasket and do the resurfacing
for $1200.00 (labor and parts). Unless the
block is cracked I'm going to have the work
done and put some money away for a new engine
at a later date.



vern
Dodge Dakota
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12/04/2004
16:07:38

RE: Low Cylinder Compression
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if you pay $1200 for that your getting took,
$250-350 will buy the gaskets and resurface the heads,more than likely less,make a couple calls to a parts store and a machine shop for prices,
try napa or carquest

whats he get a hr? $75-100

for another $1200-1500 you could buy a rebuilt motor



Rv
Dodge Dakota
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11/06/2016
15:36:54

RE: Low Cylinder Compression
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Message:
Ok on 2and8 says I have no compression ,but
no code came other than map Sencer n
throttle sencer.I blew radiator but put new
one next day and sparkplugs and map sensor,
but runs like vacuum leak or foul plug.can't
find any problem. Some say head gasket..no
white smoke and no milky oil ... what you
think about that......




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