13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHP0491 and P0492 drive while troubleshooting?
Leading reported evidence
Check ’ dictum once again true
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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 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.
Performed · outcome unconfirmed
The old ‘last thing touched, first thing checked’ dictum once again true.
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
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
Leading evidence: 'Check ’ dictum once again true' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check cracks and i found very small crack in the' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. 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 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.
Performed · outcome unconfirmed
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
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 contain suggestions
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.
Suggestion
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
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 contain suggestions
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.
Suggestion
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check cracks and i found very small crack in the
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
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
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
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.
Performed · outcome unconfirmed
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
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
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
Test by isolating the vacuum system at the check valve
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
You can test by isolating the vacuum system at the check valve, then use a hand vacuum pump to apply vaccum to the canister and associated lines/valves and check for leakdown (sometimes the crack in the vacuum canister will not leak until sufficient temperature is reached)
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.
13 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
But as long as you don't live on a dirt road, and can get it fixed fairly quickly shouldn't be a big problem.
Last night pulling in to the garage, I had a slight stumble followed by check engine light. P0941 and 2. Verified through scanner. Been reading lots of good troubleshooting posts. My question is can I drive it while working through trouble shooting if it�s not a quick obvious fix?
thx Brian
P0491/2 are for secondary air injection, while running without proper secondary injection will NOT cause any problems, whatever is causing the secondary air injection not to work properly (like a vacuum leak) may be damaging to the engine ie. dirt ingestion. But as long as you don't live on a dirt road, and can get it fixed fairly quickly shouldn't be a big problem.
Would secondary air injection even be on if you are pulling IN to the garage? Meaning, isn�t the car warmed up and you are returning home?
My advice is that ANY check engine light on these cars should require immediate fixing. It�s just too expensive to wait for something that was working to now fail because of improper timing or fuel delivery, etc.
As you know, the secondary air injection is used to heat up or "light-off" the cats during cold start and warm up. Then after everything is warmed up and functioning properly, the DME will preform "self tests" on the secondary air injection under certain conditions by activating the air injection system and watching for 02 sensors to detect additional oxygen.
I found the FC would light off after a long idle time such as a long red light, the issue was one of the vacuum hoses going to the vacuum reservoir was leaking. it never lit off on cold start, only during test cycles.
At start up today, the SAI was not as noticeable as usual. No high pitched whine. I disassembled it and it spun with a little resistance. I lubed it up, reassembled and now it sounds normal. Cleared codes. Went for a drive. So far no check engine light.
Update - after 2 weeks, code popped back up yesterday. since it is my daily, i would think that if it were a vacuum leak, i would have gotten the code a lot quicker. i am leaning towards SAI pump. i have started another thread on borrowing one. i will keep this thread up to date on final outcome.
I had both of these codes popped up on me for over two years and i checked and replaced every thing had to do with vacuum you can imagine and smog except the SAI pump , the code always came up after getting off the freeway going through town , Finally as i was changing my starter i took the Vacuum canister out to double check for cracks and i found very small crack in the under side that i missed while checking the first and the second time .
^^^ this. Have seen that many times. You can test by isolating the vacuum system at the check valve, then use a hand vacuum pump to apply vaccum to the canister and associated lines/valves and check for leakdown (sometimes the crack in the vacuum canister will not leak until sufficient temperature is reached)
Today I took out the SAI. Tested just fine. Decided to tear in. Air filter and intake boot out. As I stared at what was ahead of me, I noticed one of the hose clamps on the intake off. Got it on and tightened. Decided to check the others. In my haste on reassembly from my starter replacement, I neglected to tighten any of them. All tight now. Will go on a test drive when the rain stops this weekend. I sure hope that�s it.
