Why does it sound like I have an aftermarket exhaust between 2100-2900 RPM?

[beavis195]

It's really weird. I have a stock muffler that's a year old and all of a sudden it would do it for a second going up hills, but now it does it all the time between 2100-2900 RPM. The tone becomes kind of cool, but to me it sounds kind of like the Dodge Caravan minivans. Anyway, I got under the car to look for pinched off pipe or holes in the muffler and couldn't find any. I don't think it has anything to do with the exhaust. When I started it a few minutes ago, the engine almost died and it shook the whole car, but then it started and ran fine. I hope someone has an answer. Thanks

 

[beavis195]

bump

 

[RFR2212]

It's 22 minutes later and yer bumping? Well, it's not exactally, the most active time of the board, don't expect some immediate response.
Pete

 

[01EB5.0]

Is the check engine light on? It may be running bad caused by weak spark plugs, weak plug wires, or clogged injectors or O2 seosors?

 

[beavis195]

no the check engine light isn't on.

 

[yob_yeknom]

Possibly one of the cats are becoming clogged or are starting to crap out on you.

 

[01EB5.0]

beavis,
do you have O2 sensors behind the cats? If you don't then I agree it might be the cats. i didn't really think about that before. i know on the newer ones it has O2 sensors behind the cats so the check engine light would come on if the cats were bad, but I an not sure about you 94

 

[beavis195]

What's a new cat going to cost me? Someone told me it be like $600. That sucks.

 

[BUCHVILLEMAN]

clean the heck out of your maf, throttle body and IACt the computer and run the codes. also the air/fuel ratio could be off and causing something screwy.

my fake dad says when it does that get onthe highway and run it wide open for a minture to "blow it out" of course if its sick it might blow it up.

 

[Frshpwdr2k]

Clean everything

Just clean everything like MAF and throttle body, and then disconnect negtive, see if she runz betta then.

 

[01EB5.0]

If you buy new aftermarket hig flow cats I have seen them for like $200. after installation it may be more (unless you do it) and you get better exhaust flow and more power from that . Good luck!

 

[yob_yeknom]

There are no O2 sensors after the cats. That didn't start until '96.

A new cat, like Travis said, should be around $200. Expect at least $150 to have one installed. Question is, do you have one cat or two?

 

[01EB5.0]

yob_yeknom,
do you have high flow cats? if so what brand and how you like them?

 

[yob_yeknom]

Travis, unfortunately I do not have aftermarket cats. I wish I did though, but have had no luck in finding any high flow models for Explorers.

Weren't you trying to find out if ones for a Ranger would work? How'd that turn out?

 

[01EB5.0]

The ones for the ranger will not work. they are different i was told. i know someone who is having high flow cats installed at an exhaust shop. I will find out what brand. he has a 96