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I'm posting this in advanced because I believe it is advanced tech. Feel free to move this, but we're dealing with two issues at the same time here, which can be closely interwoven...anyhow...
A little background info. I was a while overdue on an oil change (65000 mile engine on Blend 10w-30). I usually go every 3000 to 3500, but I was closer to 5000 or so. Well, it started to misfire, and since the plugs were used, I figured I'd knock out two birds with one stone. I noticed though that under load, not only would I misfire, It would miss so nastily it made a knocking noise. nearly bad enough to make it sound like the catalytic converter was going. Bit of info number two, I had the converter replaced (stock for stock) about 15-20k ago. At one point I got the flashing SES.
Go on a little farther, change the oil and plugs. Idles smoother. Seems to have a little better pickup. Problem solved? No. Go to pass someone at 20mph in second gear, WHACKWHACKWHACK says mr Knock. CRAP. I checked on the wires when I got home from class that night, and yeah, they had some nice shiners on them. So i swapped those back in for the stockers, which have seen probably 25000 miles total use. ALL connections perfect, so it seems. Idles better, when revved up in neutral the kind of PULSE that would come from possibly(?) an intermittent misfire was eliminated. All connections were good on autolite 606's and stock wires, BUT i could see very intermittent few and far between little blue spots of light in the darkness. Arcing? Don't know.
Move on to today. Car is absolutely SLUGGISH. Just trying too hard to accelerate. Not misfiring, at least not bad enough to cause jerkiness or that loud knocking noise, but NOTICEABLY sluggish non the less. Backpressure building up? Coil packs going out? Plugs and wires have been replaced...One or two coils was replaced at ~30,000 miles. Could one of those, or another be going sour as well? But TONIGHT, car ran absolutely like a scalded dog. Awesome getup and go.
The reason I go asking these questions, Is because one, after much resarch, and talking to member "Jason", who is a mechanic at a GM dealership, we hadn't come to a definite answer. it could be emissions related (O2 sensor replaced at ~53000???), it could be ignition related, it could be both.
I don't know, I'd like to have a 'meeting of the minds' of those who peruse adv tech to help me out. I could just as easily Hack the convertor off and weld in a straight pipe, or go buy a new ignition module and coils, But trial and error just isn't in order here. Thanks for help in advance.
A little background info. I was a while overdue on an oil change (65000 mile engine on Blend 10w-30). I usually go every 3000 to 3500, but I was closer to 5000 or so. Well, it started to misfire, and since the plugs were used, I figured I'd knock out two birds with one stone. I noticed though that under load, not only would I misfire, It would miss so nastily it made a knocking noise. nearly bad enough to make it sound like the catalytic converter was going. Bit of info number two, I had the converter replaced (stock for stock) about 15-20k ago. At one point I got the flashing SES.
Go on a little farther, change the oil and plugs. Idles smoother. Seems to have a little better pickup. Problem solved? No. Go to pass someone at 20mph in second gear, WHACKWHACKWHACK says mr Knock. CRAP. I checked on the wires when I got home from class that night, and yeah, they had some nice shiners on them. So i swapped those back in for the stockers, which have seen probably 25000 miles total use. ALL connections perfect, so it seems. Idles better, when revved up in neutral the kind of PULSE that would come from possibly(?) an intermittent misfire was eliminated. All connections were good on autolite 606's and stock wires, BUT i could see very intermittent few and far between little blue spots of light in the darkness. Arcing? Don't know.
Move on to today. Car is absolutely SLUGGISH. Just trying too hard to accelerate. Not misfiring, at least not bad enough to cause jerkiness or that loud knocking noise, but NOTICEABLY sluggish non the less. Backpressure building up? Coil packs going out? Plugs and wires have been replaced...One or two coils was replaced at ~30,000 miles. Could one of those, or another be going sour as well? But TONIGHT, car ran absolutely like a scalded dog. Awesome getup and go.
The reason I go asking these questions, Is because one, after much resarch, and talking to member "Jason", who is a mechanic at a GM dealership, we hadn't come to a definite answer. it could be emissions related (O2 sensor replaced at ~53000???), it could be ignition related, it could be both.
I don't know, I'd like to have a 'meeting of the minds' of those who peruse adv tech to help me out. I could just as easily Hack the convertor off and weld in a straight pipe, or go buy a new ignition module and coils, But trial and error just isn't in order here. Thanks for help in advance.
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