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Unread 07-20-2014, 08:01 PM   #1
Chase0808
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Please help CEL

I had a cel a couple days ago for the crankshaft position sensor. I replaced it with one from napa. The light went away but then I got a cylinder 3 and 4 misfire code. I replaced all spark plugs and the light went away. Now it came back on today with the same codes. P0300 P0303 P0304. Do I need to get a the oem crankshaft position sensor through jeep? Has anyone had the same problems? Also, when I'm driving the CEL will both blink and be solid. What does that mean? Id like to try to fix this do I don't have to take it to troncalli and have to pay a ton of money.

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Unread 07-20-2014, 09:37 PM   #2
WhiteMtnJeep
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When the CEL is blinking a misfire has been detected, when solid a code is set.
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Unread Yesterday, 12:54 AM   #3
Chase0808
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Quote:
Originally Posted by WhiteMtnJeep
When the CEL is blinking a misfire has been detected, when solid a code is set.
Could a bad cps cause a misfire

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Unread Yesterday, 05:07 AM   #4
SCWrangler01
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Quote:
Originally Posted by Chase0808 View Post
Could a bad cps cause a misfire

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I don't believe so, you might want to make sure nothing was knocked loose while installing the CPS. It is tight working on the passenger side of the engine.
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Unread Yesterday, 02:46 PM   #5
Chase0808
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Yeah I did. I'm getting a blinking CEL so I took it in to jeep. I know it's going to cost me an arm and a leg too

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Unread Yesterday, 03:15 PM   #6
Robbie13
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Been fighting a random misfire on mine as well. Seems it can be several different things to cause this. Found a vacuum leak. Repaired. Replaced spark plugs a second time. Dropped from 93 octane to 87. Have ordered a new coil pack. Have ordered a complete new exhaust system. May be unrelated but was not satisfied with cat readings I did. Do please post and let us know what they come up with.
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Unread Yesterday, 11:30 PM   #7
Chase0808
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Okay I will

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Unread Today, 11:19 AM   #8
JStMarie
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Quote:
Could a bad cps cause a misfire
A bad Crankshaft Position Sensor (CKP) can cause a misfire issue. We've seen it on this forum many times when swapping in a non OEM sensor as they are notorious for this exact problem.

A bad Camshaft Position Sensor (CPS) can also cause misfire issues as well. In a distributor-less engine a bad CPS will allow the cylinders to go out of time.

In your case I would start with replacing the non OEM CKP with an OEM version. If your dealer is worth it's weight in salt and has been made aware that the CKP was recently replaced they will check this first.

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