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Old 05-25-2015, 07:35 PM   #1 (permalink)
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Default Need help diagnosing a problem sputters/stalling

I have a 04 suzuki forenza that has ran fine up until about 6 months ago, it accelerates slow, sputters almost, stalls when putting it in neutral backing out and pushing in the clutch when coming to a stop light.

I had a code for a catalytic converter, so I replaced both cats which I thought would be the cause of the problem but I was wrong..

I cleaned the throttle body, cleaned the EGR valve, replaced the air filter, replaced the spark plugs and wires?

I don't know what else it would be? I thought maybe fuel filter but the filter is inside of the pump? would it still get plugged up?

Any advice would be great
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Old 06-24-2015, 02:01 PM   #2 (permalink)
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im having a similar issue. I would love to hear what others can share
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Old 07-16-2015, 02:24 PM   #3 (permalink)
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Hi! What it sounds like to me is a bad, or dirty, IAC valve. You have an 04 so it's easy thing to check. It's on the rear of the throttle body on the drivers side. It's plugged into the harness and is held in place by two screws. Go to a auto parts store and get yourself a can of electronics safe cleaner. I think it's the one that's safe to clean MAF sensors. Unplug and remove the IAC. Don't push down on the pintle, the tip of the valve, you don't want to break it by accident. Then give it a generous spray down with the MAF cleaner until it looks clean. Now let it dry for a bit. You can also clean out the air chambers. There's a plate on the driver side side of the throttle body. It has 4 screws I think. This covers the air chambers for the IAC. Be sure to put a rag Inside the throttle body to stop any cleaner from passing back Into the throat of the throttle body. Now replace everything and start the car. The car will run rough for a few minutes so don't get scared. Then take it for a drive and see how it works. If it's ok it was a dirty or faulty IAC valve . What happens is they get dirty from blowby gasses leaving the engine and getting put back into the the intake hose and then into the throttle body. Now you can either drive it or replace the part. That's up to you. GaFooB this won't work on an engine newer than 05 if you have the drive by wire system. Let us know what happens. Anything else
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