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Originally Posted by mustang67408
I have seen this before and it's a B$T$H to diagnose.
I think your on the right track.
ARE S&S Headers LONG TUBE? Is the 02 located in the same spot as the factory spot, or does it isolate it to 1 tube in the approximate location?
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The sensor is located at the end of the headers close to the cat.
Here's a picture of the sensor on my truck that I took after the install. It's from the front looking to the rear.
Quote:
Originally Posted by mustang67408
You probably already answered this, but I dont remember, t-belt ok?
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The timing belt has not been replaced yet, but my engine problems started almost 2 years and 20K miles ago.
Quote:
Originally Posted by mustang67408
Brake booster vac leak?
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Haven't tested this yet. Wouldn't there be some brake performance problems associated with that?
Quote:
Originally Posted by mustang67408
I wish I was closer to look at this thru the toyota scan tool.
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I have seriously considered driving to Vegas with my truck so that you could take a look at it.
By the way, I purchased a PC based scan tool from Auterra a few months ago in hopes that it would help point to the cause of my engine problems. I initially looked closely at the trim figures for the O2 sensors but didn't see anything unusual. I'm not sure what the short and long term trim figures are supposed to look like but each sensor value was close to its counterpart on the other bank.
Something that did surprise me was the timing advance figures. According to the scan tool, the engine's timing is almost constantly advanced at around 25 degrees ± 5 degrees while driving at a constant speed. I can't find anything that tells me if this is normal.
I can record live engine data while driving and play it back later. I can then take a screen shot of either the numerical data or a graph of the data. Now that all of my coils have been replaced, I plan to take a few more data runs. Which parameters would you recommend that I record?
Cupidstoy,
I'll do the waterspray test to see if my engine reacts to it.
Many thanks,
Paul