Last post on Aug 03, 2010 at 6:39 PM
You are in the Subaru Legacy & Outback
What is this discussion about?
Subaru Legacy, Subaru Outback, Sedan, Wagon
#21 of 30 Re: crank sensor? [xwesx]
Apr 26, 2010 (4:37 pm)
No my car didn't throw a CEL. I think I'll give the grounding strap a try though for elimination purposes.
I'm in the middle of looking at wiring diagrams to see if the PCM has a ground along the line somewhere.
Also want to try and checkout the ECT sensor somehow, as I've heard that this could be a major cause. .
#22 of 30 Re: Revs dropping and rising again. Help ! [xwesx]
Apr 27, 2010 (8:00 pm)
Sorry, I didn't see that I was being paged the other night.
I doubt that it applies here. P0420 - Cat efficiency below standards - is a code usually triggered if the downstream oxygen sensor doesn't think that the cat is properly cleaning up whatever hydrocarbons are being produced.
The front sensor directly relates to engine performance. When I had trouble with one of those, there was stumbling and other driveability issues as the system kept tweaking mixture, timing, etc., to reduce emissions.
Whatever does get produced should be cleaned up (assuming it is not excessive) by the cat. The second O2 sensor is then a monitor to be sure that the cat is doing the job. I don't believe that It does anything to engine performance - just monitor and report.
#23 of 30 Message to xwesx
Apr 27, 2010 (8:16 pm)
Hey brother I have a question about wheels tires in Chrysler Town & Country what 16" wheels discussion .Would you mind looking at that please ? thanks timbodey
#24 of 30 Re: Revs dropping and rising again. Help ! [fibber2]
Apr 28, 2010 (4:05 pm)
Even if the CAT got really clogged ? maybe
#25 of 30 Re: Revs dropping and rising again. Help ! [motoman984]
Apr 28, 2010 (7:56 pm)
Last time I experienced a really clogged cat, the engine ran rough all the time. Stick an obstruction into the tailpipe and see what I mean. No power if it cannot breath. Plus, I'd think that the rear detector would throw a constant code, not the one brief time that you reported. Of course, I could be wrong!
#26 of 30 Re: Revs dropping and rising again. Help ! [fibber2]
Apr 29, 2010 (6:00 am)
My 1980 Mustang 3.3l straight six had that problem. It basically stumbled and choked. Never ran properly until I swapped the cat out.
#27 of 30 Re: Revs dropping and rising again. Help ! [fibber2]
Apr 30, 2010 (8:25 pm)
Scary thing is that the car doesn't run rough all the time and even when it does, you'd think it would give a CEL
#28 of 30 Re: Revs dropping and rising again. Help ! [ateixeira]
Apr 30, 2010 (8:27 pm)
The last week it has been brilliant and hasn't missed a beat, shouldn't of said that without touching some wood first. Oh well the missus is gonna use the car this weekend hee hee hee
#29 of 30 Re: Revs dropping and rising again. Help ! [fibber2]
Aug 02, 2010 (5:51 pm)
Car has been fine now for ages, with only about once every 2 weeks missing a beat. I just turn the ignition off and back on and it runs brilliant for the next couple of weeks. The only extra sympton I smell now is a smell of rubber or plastic burning.
Have had a look underneath and can't see anything. My next project is to change the coolant before winter and at the same time change the ECT sensor while I'm at it
Have heard that this has a major part to play in cooling and vehicle running. No my vehicle isn't overheating, well the temperature gauge doesn't say it is.
Aug 03, 2010 (6:39 pm)
I looked underneath the hood as I could see smoke eminating from it, the engine did smell very hot, I saw smoke rising up and got on the ground and looked.
Oil was leaking from the sump pan gasket on to the exhaust and that's what the smell was. Why would this be happening? it's like it is under pressure or something like that