4x4Wire TrailTalk

Loss of power

Posted By: lochabay

Loss of power - 05/04/12 01:52 PM

1997 Sportage, 4x4, auto. Car is experiencing a loss of power. Engine runs good, has new plugs, coils, wires, and coil feed cable. No transmission slippage or other tranny problems. Just very little power. Will barely go up a long hill near my house when it has always gone up this hill with ease. Acts like it has a back pressure problem, but there seems to be plenty of exhaust coming out of the tailpipe. My obd tester has apparently quit as I cannot retrieve any codes. Check engine light is on, although I may have created this when I disconnected the MAF sensor to see if it would make any difference (it did not). As usual, you insights will be appreciated.
Posted By: Lou

Re: Loss of power - 05/06/12 01:04 PM

Not experienced this with mine but from previous threads here, this looks very much like a clogged catalytic. Then I'd proceed to a disconnect and test a bit of extra noise

....you know, the exhaust CANNOT accumulate...ALL the exhaust will eventually go out, otherwise the engine would not run at all....but getting it out with a restriction will require more (back) pressure (thus restricting the intake) , which is precisely what you said ..
There might be a second explanation..but probably not as impairing as what you describe. Knock sensor failure would set a default mode that retards spark...hence less power, but the clogged catalytic is my best guess.

Here's even another hint from "brettclancy" on another forum:
"I removed the #1 converter only to find it mostly empty. Seems the guts of the cat have crumbled and collected in the exhaust pipe between the #1 and #2 cats. "
Posted By: Everet

Re: Loss of power - 05/06/12 11:11 PM

Your 97 only has 1 catastrophic converter. It sounds like either that or you have slipped some teeth or have a broken/wallowed out key/keyway on the crankshaft for the timing belt gear.
Keep us posted on what you find.

Everet <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />
Posted By: Lou

Re: Loss of power - 05/07/12 09:02 PM

everet is right: slipped timing belt is a common issue...that slipped my mind.. <img src="/forums/images/graemlins/smile.gif" alt="" />
Posted By: lochabay

Re: Loss of power - 06/22/12 02:21 PM

It was the cat. As I cannot read the codes in that car for some reason, I was reduced to guessing. I guessed fuel pump. I was wrong. Where I live (Pacific island) there are lots of folks below the poverty line. No money is spent on parts that can be avoided. The mechanic I eventually took it to just cut it off and put a straight pipe in without asking me. Anybody who would buy a cat when you can do without it would be regarded as a fool here. Oh, well, there is zero air pollution here, with or without cats. Is not having a cat going to be harmful to the engine? If it's going to cause problems I will go ahead and buy one.
Posted By: homerdog

Re: Loss of power - 06/22/12 03:36 PM

I ran mine without cats for quite a while with no problems. Some have said there is a loss of low end power on the automatics but I've got a manual transmission and it felt like it had a little more power to me.
Posted By: lochabay

Re: Loss of power - 06/23/12 03:51 PM

I agree. With the new fuel pump and filter and no cat, car jumps like a jackrabbit.
© 2021 4x4Wire TrailTalk