Camry rough running

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  #1  
Old 05-23-09, 10:54 AM
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Camry rough running

2001 Camry 4cyl.sedan auto 101000 mi.

Car runs rough. My friend took it to a independent shop and they diagnosed it as needing plugs and wires. He put in plugs and wires and it still ran rough,so he took it to a Toyota dealer and they said the same thing and wanted $300 to replace them.

My friend bought a set of plugs and wires at a auto parts store and installed them and the car still runs rough.

It may be a coincidence,but all this started after he had the CAT. replaced.

Thanks for any help.
 
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  #2  
Old 05-23-09, 10:58 AM
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Has anyone put a scanner on it or at least read codes?

That car has a distributor, so in addition to plugs and wires I would have added cap and rotor as likely culprits (and they're preventive, routine manintenance items anyway).

Why was the cat replaced? Rust out?
 
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Old 05-23-09, 11:07 AM
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The CAT was "burned out". I mentioned the CAT because i thought the burned out CAT might have taken out a OXY.sensor,or two.

Good point on the rotor and cap.
 
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Old 05-23-09, 11:21 AM
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The important O2 sensor on that one is up on the exhaust manifold far from the cat. The rear O2 only helps measure cat efficiency. It is odd that the problem cropped up subsequent to cat replacement.
 
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Old 05-23-09, 11:39 AM
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The car doesn't burn any oil.
I asked him about the rotor and cap,and he said that the plug
wires go into ,don't sound like this car has one. I'm wondering if has coils,of which could go bad?

He also said that at both the independent and dealer their computer scan code said plugs and wires. No mention of oxy. sensors.
 
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Old 05-23-09, 04:19 PM
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Update:

Problem solved. Two spark plug wires were switched.
Either this was done on purpose at the shop that replaced the CAT for more business,or the wires were not placed back on the correct plugs if one had to removed for checking codes,scan,etc.

Pretty sloppy business.

At any rate,my friend is happy its running fine.

Thanks guys for your help.
 
  #7  
Old 05-24-09, 03:09 PM
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Serious brain fart on my part (since my wife drives same car); no distributor on that one. Don't know what I was thinking.

Interesting observation: Two different shops misdiagnosed it as needing plugs and wires vice wrong firing order???? Hmmmm.... Beer 4U2
 
  #8  
Old 05-24-09, 03:52 PM
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Correct me if i'm wrong,but many years ago the firing order and firing sequence could be observed on a scope/scanner. Ya,i know i'm dating myself.

I would have thought that todays diagnosing would have caught this.
 
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Old 05-24-09, 04:14 PM
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No..I think if someone had actually put it on something like they had had in the old days (didn't Snap-On make a lot?) with a scope and all..they would have seen it.

Or probably a good new scanner that someone actually looked at the real time data..instead of just jumping on the codes.

I'm not ragging on the new school guys..they're important too, but an old time MECHANIC (as opposed to a TECHNICIAN) probably would have found it first time.
 
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Old 05-25-09, 06:58 AM
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Yeah, you'd think crossed wires would be pretty early in the troubleshooting tree, but I've been guilty myself of jumping to conclusions and missing something pretty basic (but I'm not a real mechanic, so that lets me off).
 
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Old 05-25-09, 03:03 PM
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Do either of you know what the firing order is from left to right looking at the engine from the front?
Thanks
 
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Old 05-25-09, 05:26 PM
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I think it's 1-3-4-2, but don't quote me on that. Beer 4U2
 
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Old 05-25-09, 05:35 PM
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Per autozone....
Firing order 1-3-4-2 engine --- | 1 | front | | | 2 | c o i l s <- of | | --- --- | 3 | |3 2| |4 1| vehicle | | --- --- | 4 | ___


Whatever the rest means....might not have displayed right.
 
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Old 05-26-09, 04:42 AM
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Thanks again,

I very much appreciate your help. Now to find out how to clear the check engine light,or whatever its called.

Autozone wouldn't do it.

daswede
 
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Old 05-26-09, 04:47 AM
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Need a scanner/reader to do it.
 
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Old 05-26-09, 04:59 AM
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O.K. Thanks for the quick reply
 
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