12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHReplaced Spark Plugs Now Getting P0303 Code
Reported repair
Replace ignition coils
Reported resolution
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report a fix
1
1 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported fix · Original poster
I verified the spark plug torque and swapped coil packs on cyl 2 and 3 and still got the code. Then put one of my old plugs back in cyl 3 and that solved the issue (at least no code during a 30 minute drive).
Leading evidence: 'Replace ignition coils' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'customer' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace ignition coils' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace ignition coils', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report identifying a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause
The crap that we see from there is caused by the customer that specs such a low quality.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that report identifying a cause
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause · Original poster
Agreed, I was surprised as well that it was the plug, had that pegged as a long shot but had already eliminated the spark plug proper torque, coil pack, and the coil pack electrical connection so gave swapping the plug a shot.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace ignition coils
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1
1 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported fix · Original poster
I verified the spark plug torque and swapped coil packs on cyl 2 and 3 and still got the code. Then put one of my old plugs back in cyl 3 and that solved the issue (at least no code during a 30 minute drive).
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
Because of this I bought one new style coil pack and installed it into Cylinder 6 (easy to access in case there was an issue using 1 new style along with the 5 old style coil packs).
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported cause · Original poster
Agreed, I was surprised as well that it was the plug, had that pegged as a long shot but had already eliminated the spark plug proper torque, coil pack, and the coil pack electrical connection so gave swapping the plug a shot.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace ignition coils
1
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report a fix
1
1 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Reported fix · Original poster
I verified the spark plug torque and swapped coil packs on cyl 2 and 3 and still got the code. Then put one of my old plugs back in cyl 3 and that solved the issue (at least no code during a 30 minute drive).
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
I verified torque on spark plug and reset the coil pack and verified it was electrically plugged in for Cylinder 3 - this did not solve the issue.
I replaced the spark plugs on my 2004 C2. While doing so the Cylinder 1 coil pack was noticeably cracked. The car has the old style coil packs and the dealership only has the new style. Because of this I bought one new style coil pack and installed it into Cylinder 6 (easy to access in case there was an issue using 1 new style along with the 5 old style coil packs). Now I am getting a P0303 (Cylinder 3 misfire) code. I verified torque on spark plug and reset the coil pack and verified it was electrically plugged in for Cylinder 3 - this did not solve the issue. Is there any way the single new style coil pack installed in cylinder 6 (passenger side front) could make me throw a misfire code for cylinder 3 (drivers side front)? Although i was careful, is it common for the coil packs to get damaged during removal and install? Thanks!
It could be a bad coil or bad spark plug. Try swapping the coil on #3 to a different cylinder and see if the misfire follows it. If not, then swap the spark plug. If the misfire stays on #3 there something else going on (wire harness to coil not seating all the way? - just guessing here).
The new coil pack won't cause a problem. Check that the wire to the coil is on securely. Pull on it. Sometimes they seem like they're on correctly but they are not fully clicked in. It has happened to me. You need to hear/feel the click.
You can pull the rubber boot back, seat the connector and move the rubber boot back. That really makes sure you have the connector well seated in the coil.
Seems like it was a bad spark plug from the supplier. I verified the spark plug torque and swapped coil packs on cyl 2 and 3 and still got the code. Then put one of my old plugs back in cyl 3 and that solved the issue (at least no code during a 30 minute drive). Ordered a new plug and will get that installed. Thanks all.
Agreed, I was surprised as well that it was the plug, had that pegged as a long shot but had already eliminated the spark plug proper torque, coil pack, and the coil pack electrical connection so gave swapping the plug a shot. I ordered 6 Bosch FGR5KQE0 plugs from Pelican, only the one was an issue.
Now working closely with global engine manufacturers, Bosch produce spark plugs with 26 different electrode layouts. They have expanded their production facilities from their Bamberg plant in
Germany
and now also manufacture in
Brazil
,
China
,
India
and
Russia
, distributing their car parts worldwide.
Maybe one came from an outsource..made in China.
China can and does make high quality products. The crap that we see from there is caused by the customer that specs such a low quality. They just make it to whatever spec the customer wants and since we are all too cheap to pay more money for better quality, we end up buying them. Bad new spark plugs are rare but when you work on enough cars over the years, you will see a couple. I has nothing to do with brand, place of manufacture or anything else. Things like this happen. The elaborate the spark plug is the bigger the chance of something going wrong during manufacturing. I use regular copper core Champions in mine. They will not last as long as the platinum/iridium tipped ones but I don't care since I do all my work anyways.
Imo is correct that China is not the sole issue. Plenty of quality things are made in China. One of the biggest issues in Chinese manufacturing is unfortunately very little control over counterfeiting and counterfeit parts being mixed with genuine parts due to warehouses "batching" storage of items and not keeping shipments separate. There's an entire council dedicated to testing and identifying counterfeit parts now that it's such a huge issue.
https://a2c2.com/
This is a source reference. Confirm exact model applicability in the original material.
