please help, i am so confused

[danzafeeva2005]

i have a 2001 suzuki esteem sedan, recently my car has been having some hard starts. but after starting my car the other day, the car idles at about 3 grand (sometimes 4) but drops to about 2, and fluctuates on and off between 1.5 and 2 grand. the air filter as well sounds like a jet engine, it seems like it is sucking more than enough air into it. thinking that it my idle air control valve, i removed it, and cleaned all the built up crap out of it with high hopes that this would surely work, well i was wrong, so i cleaned out my egr valve as well. unsure of what the problem might be, i started to disconnect the sensores while the car was running to see if i could possibly find one that would change its rpm, unfortunatley, with about 4 of the sensors disconnected it still ran. but it didnt change anything. would anybody be able to diagnose this strange occurance i am having with my car. i will also throw out that the check engine light is on, but it only tells me about my catalyst.

[Isuzuzuki man]

1.6 or 1.8, (thinking 1.8 is the only 01 option)
First get all the codes from the computer, you will now have codes set from all the sensors you disconnected. The catalyst codes means the rear O2 sensor is reading wrong or the catalyst is actually bad.
Sounds like maybe its running really rich, that might throw a cat code from the excess hydrocarbons in the converter, and would also explain the high idle, the computer is adding air to get the mixture back right, no way to bring the speed down until the excess fuel is taken care off. Maybe a leaky injector?
Check the plugs for color, sooty or black would conform this, also if you can get a scan tool on it, the front O2 should be saying rich if my hypothesis is correct.

[danzafeeva2005]

yes, it is a 1.8. after discussing it with the dealership, they tell me that it is probably a bad sensor, but after discussing it with my buddy, he says that it is my fuel pressure regulator which is only able to be gotten from a dealership.

[Isuzuzuki man]

Originally Posted by danzafeeva2005

yes, it is a 1.8. after discussing it with the dealership, they tell me that it is probably a bad sensor, but after discussing it with my buddy, he says that it is my fuel pressure regulator which is only able to be gotten from a dealership.

That is a possibility. I suggested getting the codes first, if no codes are present other then the sensors you disconnected then yes look at the fuel system.

[jim_naisium]

Yeah, I think you are getting way too much fuel in there too and the engine computer is correcting the a/f mixture so that the engine will stay running, end result though is the high idle you are getting.

My Honda motorcycle has a gas enrichment system (its not exactly a choke) that feeds extra gas into the engine as the engine is warming up from being cold from sitting all night, if I don't turn this down as the engine is warming up I end up with an extremely high idle, so kind of the same thing as what is happening to you.

[danzafeeva2005]

well i figured it out, it was the idle air control valve, the little pain in the butt thing right above the egr valve. but as soon as i put it on, it worked fantastic. so very confusing of an automobile.

[jim_naisium]

Glad you figured it out, yes it is a bit confusing its one of those engines where there are parts everywhere but no obvious reason as to why they are there or what they do, yet the engine runs wonderfully.

[Isuzuzuki man]

Yes they can be a bit goofy, I had an Evap code haunt me. Never buy a Motormite brand cap, may be sold under a diff name but the "M" on it will tell you, go with Stant or OEM.

[RebelPC`]

I have noticed with the Suzuki that a lot of idle problems are caused by the IAC.......This can be cleaned and it usually works out fine.