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2000 XJ purchased on e-bay, Diagnostic COdes


 
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Reader
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Joined: 11 May 2007

PostPosted: Sat May 19, 2007 9:59 am    Post subject: 2000 XJ purchased on e-bay, Diagnostic COdes Reply with quote

I am a newcomer to workng on cars and to purchasing a used car on e-bay. I hope the sinking feeling in my stomach is premature.

I just got back from taking it to the inspection station. It failed for emissions problems.

They advised the check engine light does not work and it produced three codes:

P1491

P1491 Radiator Fan Control Relay Circuit An "open" or "short" circuit detected in the Electric Radiator Fan Control Relay circuit

I know there was a recall to install a fan shield on this model. Mine still needs it.

P0303

P0301 - P0304 Cylinder Misfire Misfire condition detected in cylinder #1/2/3/4

and

P0305

P0305/P0306 Cylinder Misfire Misfire condition detected in cylinder #5/#6


Is this an indication the cylinder head might be cracked? It does not seem to run rough, but perhaps the idle is very slightly high.

How about just a little SeaFoam and all will be well?

What is your best guess as to what is the matter with it? What should I do first? How do I get the check engine light working again. I guess first thing is to check the fuses?

Thank you


Last edited by Reader on Sun May 20, 2007 1:41 am; edited 2 times in total
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dancerman
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Joined: 08 Jun 2006
Location: Atlanta

PostPosted: Sat May 19, 2007 12:43 pm    Post subject: Reply with quote

CEL not working probably the bulb or wire cut (a common trick by dishonest sellers).

As for the other codes.... I'd look into the misfires first. Check the basic stuff like plugs, wires and ignition. I assume it runs. I wouldn't think it's a head crack but more likely ignition related because all 6 cylinders are flagged. Do a compression test, too.

Just curious, how much did this gem cost on eBay?
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Reader
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Joined: 11 May 2007

PostPosted: Sat May 19, 2007 5:43 pm    Post subject: Reply with quote

2000 XJ - 97,000 miles- $4,205.00

I thought the codes meant Number 3 and Number 5 were misfiring and the others were fine. Was I wrong? P0303 and P0305 refer to the third and fifth cylinders, I believe.

I have changed the oil, changed the air filter and purchased plugs. Will try to install them tomorrow.

If that does not work then on to replace the wires. Do you have any recomendations for a set of wires? OEM or are there better aftermarket sets?
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DelmarvaXJ
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Joined: 28 May 2007
Location: Naptown Maryland

PostPosted: Mon May 28, 2007 7:25 am    Post subject: Reply with quote

Haynes makes a good manual you can pick up at any automotive store, and in the back should have all of the codes listed. I've yet to pick one up, but very soon I will need to....
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Tue May 29, 2007 4:25 pm    Post subject: wires Reply with quote

IMO it's OEM all the way when it comes to plug wires. I've had so many issues with aftermarket ones.
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Mike

Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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Glowyrm
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Joined: 27 Mar 2007
Location: Long Island NY

PostPosted: Wed May 30, 2007 5:55 am    Post subject: Reply with quote

Save 1 or 2 of your old wires for emergency spares.
_________________
'87 XJ Chief w/tow pack. Dana 30/44 f/r
3.5" lift 4.88 gears NP242 t-case
Numerous junkyrd doodads
31x10.5's
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