Help with CEL - P0302 & P0300
05-12-2010, 10:12 AM
#1
Help with CEL - P0302 & P0300
My car is an '03 Wagon with about 138k miles on it. I had the timing belt/water pump/etc. done around 30k miles ago.
So, for the past year or so, I've intermittently been getting misfire codes. I usually just clear them with the AP, and all is well for a while, until I get them again. I have the plugs changes regularly, and as of now, I last changed the plugs about 20k miles ago.
Lately, I'm getting these misfire codes almost every day. The car doesn't feel any different, but I do clear them with the AP just so I don't have to stare at the CEL.
I'm beginning to think my coil packs are on their way out. I hope it's nothing more severe. Any thoughts? Should I just replace the coil packs for good measure? How much are they? Difficult to do?
I'd appreciate any help/advice. Thanks guys.
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VAPORIZER REVIEWS
So, for the past year or so, I've intermittently been getting misfire codes. I usually just clear them with the AP, and all is well for a while, until I get them again. I have the plugs changes regularly, and as of now, I last changed the plugs about 20k miles ago.
Lately, I'm getting these misfire codes almost every day. The car doesn't feel any different, but I do clear them with the AP just so I don't have to stare at the CEL.
I'm beginning to think my coil packs are on their way out. I hope it's nothing more severe. Any thoughts? Should I just replace the coil packs for good measure? How much are they? Difficult to do?
I'd appreciate any help/advice. Thanks guys.
________
VAPORIZER REVIEWS
Last edited by kyoung05; 03-30-2011 at 11:13 AM.
05-12-2010, 10:55 AM
#3
Are you saying the valves are too tight? Or that they need to be tightened? In either case, what am I looking at in terms of $/labor to have this done? Thanks.
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Rock Hard Nipples
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Rock Hard Nipples
Last edited by kyoung05; 03-30-2011 at 11:13 AM.
05-12-2010, 11:22 AM
#4
So I just called my shop, and they quoted me $975 for parts/labor for a valve adjustment, replacing valve cover gaskets, etc. Does that sound about right?
Also, he said that Subaru recommends that the valves be adjusted at 105k miles. Is this true? Any chance I royally screwed something up by driving like 30k miles over the recommended service interval?
________
The Cigar Boss
Also, he said that Subaru recommends that the valves be adjusted at 105k miles. Is this true? Any chance I royally screwed something up by driving like 30k miles over the recommended service interval?
________
The Cigar Boss
Last edited by kyoung05; 03-30-2011 at 11:13 AM.
05-12-2010, 11:40 AM
#6
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Pornstars Euro
Last edited by kyoung05; 03-30-2011 at 11:13 AM.
05-12-2010, 11:54 AM
#8
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*** Mature
Last edited by kyoung05; 03-30-2011 at 11:13 AM.
05-12-2010, 11:55 AM
#9
So I just called my shop, and they quoted me $975 for parts/labor for a valve adjustment, replacing valve cover gaskets, etc. Does that sound about right?
Also, he said that Subaru recommends that the valves be adjusted at 105k miles. Is this true? Any chance I royally screwed something up by driving like 30k miles over the recommended service interval?
Also, he said that Subaru recommends that the valves be adjusted at 105k miles. Is this true? Any chance I royally screwed something up by driving like 30k miles over the recommended service interval?
Thanks
-- Ed
05-12-2010, 11:57 AM
#10
If its localized to 2 & 4, I would recommend first swapping your coil packs from bank to bank and see if the missfires follow them. If they do, you know its the coils and can replace them. If not, you need to look further into it.
-- Ed
05-12-2010, 12:23 PM
#11
An actual miss that you can feel, especially at idle, can signal that the valve lash is too tight. Sometimes its tough to feel that especially with stock engine mounts.
If its localized to 2 & 4, I would recommend first swapping your coil packs from bank to bank and see if the missfires follow them. If they do, you know its the coils and can replace them. If not, you need to look further into it.
-- Ed
If its localized to 2 & 4, I would recommend first swapping your coil packs from bank to bank and see if the missfires follow them. If they do, you know its the coils and can replace them. If not, you need to look further into it.
-- Ed
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Yamaha Specs
Last edited by kyoung05; 03-30-2011 at 11:13 AM.
05-12-2010, 01:03 PM
#12
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Car Info: 2005 LGT wagon
How long ago did you havethe t-belt replaced?
how long after that did the car start to misfire?
In order to properly diagnose the misfire, one must follow the OEMs diag flow chart.
Here are some of the many items that could be causing the misfire:
-bad plugs
-bad injector
-damaged harness(es)
-defective ecm.
-defective crank sprocket...could have been damaged during t-belt job.
-defective coil pack
-tight valve lash clearance.
Depending on the mileage of the motor, how well it's been maintained, what quality of parts have been used, etc, any one (or combination of) of these defects could be causing the misfire.
Obviously, no one can diagnose your particular cause over the interwebs.
It takes less than 10 minutes to determine if the valve lash is suspect and usually can be done without having to remove the spark plugs.
how long after that did the car start to misfire?
In order to properly diagnose the misfire, one must follow the OEMs diag flow chart.
Here are some of the many items that could be causing the misfire:
-bad plugs
-bad injector
-damaged harness(es)
-defective ecm.
-defective crank sprocket...could have been damaged during t-belt job.
-defective coil pack
-tight valve lash clearance.
Depending on the mileage of the motor, how well it's been maintained, what quality of parts have been used, etc, any one (or combination of) of these defects could be causing the misfire.
Obviously, no one can diagnose your particular cause over the interwebs.
It takes less than 10 minutes to determine if the valve lash is suspect and usually can be done without having to remove the spark plugs.
05-12-2010, 01:17 PM
#13
How long ago did you havethe t-belt replaced?
how long after that did the car start to misfire?
In order to properly diagnose the misfire, one must follow the OEMs diag flow chart.
Here are some of the many items that could be causing the misfire:
-bad plugs
-bad injector
-damaged harness(es)
-defective ecm.
-defective crank sprocket...could have been damaged during t-belt job.
-defective coil pack
-tight valve lash clearance.
Depending on the mileage of the motor, how well it's been maintained, what quality of parts have been used, etc, any one (or combination of) of these defects could be causing the misfire.
Obviously, no one can diagnose your particular cause over the interwebs.
It takes less than 10 minutes to determine if the valve lash is suspect and usually can be done without having to remove the spark plugs.
how long after that did the car start to misfire?
In order to properly diagnose the misfire, one must follow the OEMs diag flow chart.
Here are some of the many items that could be causing the misfire:
-bad plugs
-bad injector
-damaged harness(es)
-defective ecm.
-defective crank sprocket...could have been damaged during t-belt job.
-defective coil pack
-tight valve lash clearance.
Depending on the mileage of the motor, how well it's been maintained, what quality of parts have been used, etc, any one (or combination of) of these defects could be causing the misfire.
Obviously, no one can diagnose your particular cause over the interwebs.
It takes less than 10 minutes to determine if the valve lash is suspect and usually can be done without having to remove the spark plugs.
________
FREE **** FILMS
Last edited by kyoung05; 03-30-2011 at 11:14 AM.
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