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Unread 08-17-2014, 03:41 PM   #1
restrantek
Registered User
2005 WK 
 
Join Date: Aug 2014
Location: Orlando, FL
Posts: 3
3.7 2005 Overheated Now Missing

My Grand Cherokee overheated. Replaced radiator, thermostat (Super Flow), water pump seems ok, not leaking and impeller is not loose or wobbly. Lower hose seems too cool, top hose is extremely hot. Temp seems OK idling but Guage goes to max when I drive it a short distance. Radiator fan does comes on.

When I disconnect lower hose water flows out so probably not clogged.

Now it idles rough and misses badly. All plugs changed and coils seem good. Still overheating! I see no smoke coming out of exhaust pipe and hear no 'leaking'
sounds. Still missing. I got codes P0300, P0302, P0175

I think vacuums are good. Put Lucas for injector cleaning.

I would like to solve the over-heating issue first if they are unrelated.
Perplexed

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Unread 08-18-2014, 05:42 AM   #2
JMH21814
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1997 XJ Cherokee 
 
Join Date: Jan 2013
Location: Enfield, CT
Posts: 258
Gotta change that water pump. If the impeller broke off you'll have no coolant flow. Got to do it and verify the water pump works.
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Unread 08-18-2014, 04:44 PM   #3
restrantek
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2005 WK 
 
Join Date: Aug 2014
Location: Orlando, FL
Posts: 3
Thanks JMH21814
Water pump is good. I took out the t-stat and engine is running normal temp with just water. Antifreeze once I'm sure it's cooling. Perhaps two bad (new) t-stats? Not likely! Now on to the missing issue. One battle at a time.
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Unread 08-23-2014, 07:50 AM   #4
restrantek
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2005 WK 
 
Join Date: Aug 2014
Location: Orlando, FL
Posts: 3
Jeep 3.7 Mis-Fire

Would you change the crankshaft and/or camshaft position sensors before replacing the fuel injectors?
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Unread 08-23-2014, 10:55 AM   #5
JMH21814
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1997 XJ Cherokee 
 
Join Date: Jan 2013
Location: Enfield, CT
Posts: 258
Lets start with dtc codes:
P0175: system too rich bank 2
P0300: random/multiple misfires
P0302: misfire cylinder 2

Based on these codes and what you are describing, I would not be considering injectors, crank, or cam sensors at all. At least, not yet. You need to do some diag, don't just throw sensors at it.

Was it skipping first, then you changed the plugs? Or did you change the plugs then it started skipping? When you say it overheated, do you mean close to red or actually into the red? If into the red, how long was it there? Have you done a compression test on cylinder 2? Wet and dry? How about a leak down test? Did you verify fuel pressures?

I know it sounds like a lot to do, but you can rent most or all of these tools from parts stores and find procedures on line or YouTube. Diagnose the problem, don't just throw parts at it and hope something works.
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Unread 08-23-2014, 12:49 PM   #6
mndog75
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2006 TJ Wrangler 
 
Join Date: Aug 2014
Location: street, md
Posts: 51
Make sure stat is in correctly,not backward.Not doubting your mechanical skills just something to check.
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