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-   -   Sucking sound after running (http://www.ramforumz.com/showthread.php?t=87459)

devsoul 07-18-2011 11:12 PM

Sucking sound after running
 
I am in need of some advice. My truck runs rough and is sucking massive amount of air through the IAC. It always starts and idles fine but after a few minutes it starts to run rough and sounds like there is a major vacuum leak, which goes away after another minute or two. I have changed the IAC, post converter O2 sensor and cut a section of my converter open to see if it was plugged(in which case it was completely hollow). I have just recently changed plugs(from originals to a plus four), before all this started. I originally had three codes, p0420, p1195 and p1762. Now i only get p0420 cat. effect. I also sea foamed the entire system through the brake booster line because i ran a can in my fuel one time and the problem went away.

Any advice would be greatly appreciated!

atvfamly 07-19-2011 01:00 AM

Hey, I seen that you said you changed the "post converter" O2 sensor. Did you mean pre converter, or was it the one after the cat? I had very similar issues and changed the O2 sensor before the cat, along with everything involved with the cooling system (coolant flush, hoses, coolant temp sensor, stat), but I'm pretty sure it was the O2 sensor that cured my problem.

devsoul 07-19-2011 08:51 AM

It was the one after the converter. I was getting a catalyst effect code so I thought that was the one to change.

It does seem to either be temp. or time related. It is very consistant when it happens. Also now that I am runing the A/C all the time, I can hear the IAC open and shut when driving. It also runs rough when this is happening.

I had the thought it might be my temp. sensor, but I hate chasing my tail and spending the money on things I don't need to replace.

devsoul 07-19-2011 09:03 AM

I drove it in to work this morning with the converter still open and had the same issue. Apparently the exhaust was not plugged.

RedRam10 07-19-2011 09:06 AM

Hi and a warm Carolina welcome to the best RAM ForumZ on the web. How about posting a few photos of your truck? I'd like to reccomend a solution but don't have one for you, however, I will askmthat you jump over to the Newbie Checkin and introduce yourself. See you round the site.:Hey:

atvfamly 07-19-2011 09:12 AM

I know what you mean, hate to spend money on something that doesn't need fixing. When i changed my pre-cat O2, it also helped my mpg. I was told that the pre-cat one monitors how rich or lean the engine is running by what it senses. With my sensor being bad, it never told the IAC (idle air controller) on the back of the throttle body to lean out as the engine warmed up, which led to me having to raise the engine speed up to about 2k on the tach until it reached operating temp and would smooth out its idle. Otherwise it would run real rough, like it had a huge cam in it, all rough and lumpy. Sounds weird, but true.

atvfamly 07-19-2011 09:24 AM

Maybe it has something to do with the fact that both of our trucks are 99 Ram Sports with the wonderful 5.9 in my young sons favorite color "banana"!

devsoul 07-19-2011 09:47 AM

Wouldn't a bad O2 sensor throw a code? The only code I get is effect catalyst effect.

atvfamly 07-19-2011 10:47 AM

Mine would once in a while, but sometimes be months in between throwing a code.

atvfamly 07-19-2011 10:48 AM

What code (number) is it throwing out?


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