• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

Air fuel, O2 readings off, causing weird acceleration

F

footballplaya3k

New member
For the first couple minutes of running it will accelerate nice and smooth. After the first couple minutes, it will accelerate with a very slight hesitation every second or so. My AFR doesn't seem too bad, stays around 14.6 to 15. I think the problem is visible in the O2 readings though. It will stay around 800-900ish then drop to under 100 for a fraction of a second, when I presume the hesitation is occurring. Also idle will jump in neutral if the car is warm. No codes.

Thought it was the O2 sensor but replaced that to no avail. Ideas?

Thanks
 


Bio, good because its a new O2 sensor so I'm glad that's not the issue.

Bill, I don't go over 2500 RPM's until I'm over 160*. Aeroforce says no misfires or KR at any point. The issue always occurs when the car is warm (over 160*).
 
Other things I can think of, when car is warm and in neutral and the idle is surging, Lift's are pegged at 16.4. I would think this is a vacation leak but wouldn't it surge when its cold too, not just when its warm?
 




egr tube?

If you have an intercooler, are you still running garleaks?

O2 sensors oscillate because they're only accurate at finding lambda of one, thus they have to go above and below to attempt to stay close to the centre.
 
matt5112 said:
egr tube?

If you have an intercooler, are you still running garleaks?

O2 sensors oscillate because they're only accurate at finding lambda of one, thus they have to go above and below to attempt to stay close to the centre.
Click to expand...

Haven't checked the EGR, will do.

No more Garlocs, right stuff RTV now. I couldn't believe how horrible the Garlocs were when I took them off. Oil everywhere.

My wondering about the O2 osculation was, could it be osculating enough to cause an RPM surge or slight hesitation when accelerating.
 


On the way to work today I had p1133 pop up. Looks like bad O2 but I just replaced. I cleared the code and drove for about 20 more minutes and it didn't come back. I recall having this happen on my previous O2 that I thought was bad but turned out not to be. Ideas?
 
You must log in or register to reply here.
Back
Top