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Unread 02-04-2012, 08:12 AM   #1
BulldogTJ04
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Join Date: Nov 2011
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Evap and crankshaft position sensor?

Hey guys just a question here kinda weird. I'm losing top end power and sounds like my engine is starving when I get up around 60mph. Any ideas would be helpful thanks a lot in advance

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Unread 02-04-2012, 08:13 AM   #2
BulldogTJ04
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Oh sorry 2004 TJ 4.0
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Unread 02-04-2012, 02:21 PM   #3
jnicewan
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I would probably start with checking the simple things. Check for codes, check air filter, spark plugs etc. Maybe do a fuel pressure test. Loss of power under load at higher RPM can be any number of things, but stopped up air filter, restricted fuel filter or weak fuel pump are most common, maybe even worn spark plugs. On top of that a restricted exhaust or catalytic convertor could be the problem too.
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Unread 02-09-2012, 01:58 PM   #4
BulldogTJ04
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Ok so I changed all the plugs (they didn't look bad). Did an oil change, air filter. Checked the codes and am getting a misfire 4,5,6 cylinders. Says possible crankshaft position sensor or camshaft position sensor. So I bought the crankshaft position sensor to try out first since its the cheaper of the two. Where is this thing located???
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Unread 07-06-2012, 07:19 PM   #5
thegreenbastard
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On top of the transmission bell housing the easiest way to get to it is to (as bad as it sounds) cut a hole in the floor right next to your 4x4 shifter. It's a tough little guy to get at
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Unread 07-07-2012, 01:06 AM   #6
jnicewan
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1995 ZJ 
 
Join Date: Dec 2010
Location: Norman, OK
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Keep in mind, (and I am only pretty sure about this for your application) Cylinders 4,5,6 all share one catalytic convertor, 1,2,3 share another. If a convertor is clogged and depending on which one, it will affect 4,5,6 or 1,2,3. A clogged convertor also usually causes a loss of power under load at higher rpm.
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