P1131 and P1152

[desertbum8]

Ok. So my CEL is on and I scanned my computer and got those two codes. The engine hesitates and sounds like it misfires when I try to accelerate from a stop while the engine is cold. When the engine comes to temp. it accelerates fine but has a rough idle. Someone suggested testing my O2 sensors to make sure they weren't burned out when my Cats went bad. If anyone can tell me how to do it I would greatly appreciate it. Also I replaced the DPFE sensor because I thought that was causing the problems. It helped but didn't fix it. Thanks in advance!

 

[Tbars4]

...This should help..Check out post #4...
http://www.explorerforum.com/forums/showthread.php?t=237134&highlight=p1131

 

[desertbum8]

Oh that was some good info to have =-D. So that means my up-stream sensors are being screwy. Do you know what they are supposed to OHM out to so I can test them to see if they need to be replaced? I really don't want to replace them if I've got a vacuum leak somewhere that I just can't find lol.

 

[Tbars4]

...The odds of both sensors going at the same time is almost unheard of...

...It is that you have a problem before the sensors and they are the ones that are trying to compensate and failing to do so...

...If you ask in that thread I'm sure they will have an answer for you...

 

[Dilbert5]

Have you done any work on the engine recently? Especially the intake manifold? Some things like RTV silicone, and other gasket dressing can contaminate the O2 sensors, also fuel additives can cause problems (but this is much more rare, since most manufactures have formulated their fuel aditives to prevent sensor damage).

 

[desertbum8]

Yes actually. I recently put an 01 Ranger engine in since I blew the heads on the original engine. Other than that I can't think of anything.

 

[Dilbert5]

Did the cats go bad when the heads blew? What happened, did the headgaskets go and you had a lot of white smoke out the exhaust?

As far as testing the O2 sensors, the best way is with a scanner that will show you what the sensor voltage, and cross counts are. You mentioned that you had the codes read with a scanner. Was that a basic one that only told you the code number? There are some USB port scanners that interface with a computer, which I believe will tell you more advanced information (verify this yourself if you are interested). They have several different types for sale on ebay, for around $50.

Now back to the sensors themselves, if your engine blew up and contaminated the cats with all the junk going down the exhaust, then I would believe that the O2 sensors were contaminated at the same time. The sensors are sensitive, and easily damaged, if the cats were destroyed, then it is very possible that the sensors were too.

 

[desertbum8]

Did the cats go bad when the heads blew? What happened, did the headgaskets go and you had a lot of white smoke out the exhaust?

As far as testing the O2 sensors, the best way is with a scanner that will show you what the sensor voltage, and cross counts are. You mentioned that you had the codes read with a scanner. Was that a basic one that only told you the code number? There are some USB port scanners that interface with a computer, which I believe will tell you more advanced information (verify this yourself if you are interested). They have several different types for sale on ebay, for around $50.

Now back to the sensors themselves, if your engine blew up and contaminated the cats with all the junk going down the exhaust, then I would believe that the O2 sensors were contaminated at the same time. The sensors are sensitive, and easily damaged, if the cats were destroyed, then it is very possible that the sensors were too.

I blew a head-gasket and had water leaking into the oil. So I rebuilt the engine and about 20k miles later the radiator got a crack and leaked tranny fluid into the water which gunked up the whole engine. So I dropped the new one in. The Cats went bad at about the same time that I did the engine swap and I had to drive it around for a couple weeks until I got the money to replace the Cats. There was no white smoke that I was aware of.

 

[Dilbert5]

Sounds like you've had a rough time with the vehicle. The way I see it you have two options right now. 1) you could purchase a usb scanner to try to verify the O2 sensor function, (the learning curve is not very high, just make sure that the one you purchase can read things like sensor voltage).

2) purchase a couple O2 sensors off ebay, and just replace the upper sensors. In a earlier post TBARS7 stated that the odds of both going out are slim. And normally I would totally agree with them. BUT with your engine blowing up, and taking the cats out, I would consider that being extenuating circumstances . If enough junk went down the exhaust to kill the cats, then it is easy to believe that the O2 sensors were damaged too.

 

[desertbum8]

Yeah that's what I was afraid of. I'll try getting the scanner and sensors and post what happens. I really appreciate your help

 

[desertbum8]

Oh I found something. When I was looking at my intake manifold I realized there was a small gap where the upper and lower meet. The gap is on the passenger side. No matter how hard I try I can't get the gap to close up nicely. So could this small gap be causing these codes? Also with the gap on only one side would it still cause problems in both cylinders?

 

[Dilbert5]

Have you checked for intake leaks? It sounds like you did not. Take a propane torch (not lite of course) and go over the suspected area. If the propane finds it's way into the intake, it should affect the idle.

 

[desertbum8]

Yeah I was just about to try the propane in that gaped area.

 

[brenda00]

ford explorer 2000 code p1131 comes up changed all h20 sensor still coming up p1131 called the parts store said it was runnig to lean just dont know what to do can anyone help