Have 2010 chevy silverado. C1500.4.3L
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There are some significant differences however, one of which is that the cam sensor has been moved from the distributor to the front cover. In fact the distributor is gone altogether and the plug wires plug directly into the coil. So checking cam sensor retard will not serve the same diagnostic function as on the earlier Blazer. But we can try to diagnose this one
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Cyl 1 plug
There are some significant differences however, one of which is that the cam sensor has been moved from the distributor to the front cover. In fact the distributor is gone altogether and the plug wires plug directly into the coil. So checking cam sensor retard will not serve the same diagnostic function as on the earlier Blazer. But we can try to diagnose this one
This came off cyl 1. This cyl had the most misfires. Ynable to get cyl 5 plug off. Glass part broke. And husband will have to help with that one
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Looks like engine has been flooding - too much gas - spark plug electrode is all carboned up.
Of course you need to replace the broken spark plug - then get engine warmed up and into closed loop - then display left and right pre-catalytic converter O2 sensor voltages as well as left and right fuel trims on same scanner page (these are four basic generic OBD2 PIDS, so all scanners that display live data should work here). Take and post video of the page, as they should all be cycling up and down rapidly if the fuel mix is being controlled properly. Do not allow it to display a bunch of different data, as this slows the refresh rate of the scanner down to a crawl. You should be able to choose which PIDs you wish to monitor - and limit it to the four in question. Even better if you can figure out how to graph it, but not all software has this function.
Of course you need to replace the broken spark plug - then get engine warmed up and into closed loop - then display left and right pre-catalytic converter O2 sensor voltages as well as left and right fuel trims on same scanner page (these are four basic generic OBD2 PIDS, so all scanners that display live data should work here). Take and post video of the page, as they should all be cycling up and down rapidly if the fuel mix is being controlled properly. Do not allow it to display a bunch of different data, as this slows the refresh rate of the scanner down to a crawl. You should be able to choose which PIDs you wish to monitor - and limit it to the four in question. Even better if you can figure out how to graph it, but not all software has this function.
Last edited by LesMyer; Dec 21, 2023 at 05:57 PM.
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This is video of data stream...graphed...it's not picking up any data on fuel trims
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Looks like engine has been flooding - too much gas - spark plug electrode is all carboned up.
Of course you need to replace the broken spark plug - then get engine warmed up and into closed loop - then display left and right pre-catalytic converter O2 sensor voltages as well as left and right fuel trims on same scanner page (these are four basic generic OBD2 PIDS, so all scanners that display live data should work here). Take and post video of the page, as they should all be cycling up and down rapidly if the fuel mix is being controlled properly. Do not allow it to display a bunch of different data, as this slows the refresh rate of the scanner down to a crawl. You should be able to choose which PIDs you wish to monitor - and limit it to the four in question. Even better if you can figure out how to graph it, but not all software has this function.
Of course you need to replace the broken spark plug - then get engine warmed up and into closed loop - then display left and right pre-catalytic converter O2 sensor voltages as well as left and right fuel trims on same scanner page (these are four basic generic OBD2 PIDS, so all scanners that display live data should work here). Take and post video of the page, as they should all be cycling up and down rapidly if the fuel mix is being controlled properly. Do not allow it to display a bunch of different data, as this slows the refresh rate of the scanner down to a crawl. You should be able to choose which PIDs you wish to monitor - and limit it to the four in question. Even better if you can figure out how to graph it, but not all software has this function.
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From: North Central Indiana
OK - thanks for the video. Appears one side is extremely rich and one side is extremely lean - Sensor 1 for both banks should be 200-800mv and cycling. Unfortunately I cannot read the scale and it appears to be a couple of seconds between updates (I am used to 30+ updates per second). I did notice in the very first video you posted that the system was on open loop.
Given what we are working with on unfamiliar app I'm going to have to bow out of this one. Looks like you are correct with the fuel (too much) being a problem but the cause can be much more elusive. Too much fuel can also be the effect of another problem. Better I think to take it to a reputable shop or dealer where they can work with their own equipment.
Good luck and best wishes.
Given what we are working with on unfamiliar app I'm going to have to bow out of this one. Looks like you are correct with the fuel (too much) being a problem but the cause can be much more elusive. Too much fuel can also be the effect of another problem. Better I think to take it to a reputable shop or dealer where they can work with their own equipment.
Good luck and best wishes.
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PhilBilly
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Feb 3, 2013 10:28 AM