Recent content by Beherrschen

pagrey, I got a scanner that graphs everything out. The graphs of the two O2 sensors you suggested are different. Different spikes at different times (different large and small spikes). I'm not sure what would count as unusual behavior though. I took a screenshot of them. I haven't...

Thanks for the idea but I do not have a scanner that graphs. I'll take a look at the one you suggested.

Thanks again. I have replaced the TPS and it was no help. I have also replaced the fuel injectors. Feel like I've been guessing and checking a lot to fix this. It has been a few months since it cut off on me (it was only twice). I have heard that the RPM range is not really that low but...

Thanks for your reply and help. Thanks for pointing out the odd rpm markings. There are two marks between 0 and 1000 rpms. I never thought the first one was 250. I took the first mark as one third of 1000 and so it would about 333. Looking at it now I see that there are 3 marks between the...

So, as soon as I unplug the vacuum line to brake booster the idle goes up and stays steady. Probably up from normal rpm of 500- 600 at idle to 700 (this is a guess as I wasn't smart enough to look). The rpm when it is idling low is closer to 400. Also, it never seems to happen in the AC or...

Thanks and I'll take a look at the brake booster as you mentioned. I tried to see if the engine reacted at all to sudden presses of the brake pedal but got nothing. I have replaced the IAC.

Thank you for your replies. I thought about the torque converter but I have no other symptoms and it has been going on for months now. My understanding is that when torque converters go bad it happens fast. That true? I didn't think about the brake booster. Would that only cause the...

I have searched and searched and found no one with my particular problem. 2004 Unlimited with 4.0L and auto transmission with no error codes. So the problem is intermittent low idle at a complete stop. The idle jumps up and down about 100 rpms around the 400rpm range at a period of about 1...