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Old 03-26-2015, 09:21 AM   #1 (permalink)
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Default 2004 Forenza... I'm so lost...

So I just bought this car not even a month ago "As is" and at the time it was running great. A week later the car stalled out at a red light. It happened a few times throughout the next few days and also lost some acceleration power when going up hills. Then the check engine light came on. Took it to O'Reillys and it popped up p0108. Ordered a MAP sensor online and while waiting for it to get here it got worse, started bucking and jerking constantly while in drive. Replaced the MAP sensor, changed the plugs and wires and ran a tank of gas out with a seafoam treatment. The check engine light went off after the sensor change but it's still doing the same thing. It seems to do quite a bit better when I activate the hold button to the left of the shifter. When it's in park it revs up fine. What could be the problem? I've also checked the air filter and there doesn't seem to be any obvious air leaks anywhere. I'm so lost, I went to the guy I bought it from and he said basically it's not his problem. Any advice on what I should check next?
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Old 03-26-2015, 04:56 PM   #2 (permalink)
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Try the following (I really wish this were "stickied")

Idle Relearn Procedure:

Turn the ignition ON for 5 seconds.
Turn the ignition OFF for 5 seconds.
Turn the ignition ON for 5 seconds.
Start the engine in park/neutral.
Allow the engine to run until the engine coolant is above 185 F (85C ).
Turn the A/C ON for 10 seconds, if equipped.
Turn the A/C OFF for 10 seconds, if equipped.
If the vehicle is equipped with an automatic transaxle, apply the parking brake. While pressing the brake pedal, place the transaxle in D (drive).
Turn the A/C ON for 10 seconds, if equipped.
Turn the A/C OFF for 10 seconds, if equipped.
Turn the ignition OFF. The idle learn procedure is complete.
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Old 03-26-2015, 05:30 PM   #3 (permalink)
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I saw this before but didn't know if it was related to my issue or not. I will definitely try that though and let you know if it helps. Thank you so much for the advice! It almost feels like something is plugged up, if that makes any sense?
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Old 03-27-2015, 05:08 AM   #4 (permalink)
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Ok I tried that and it's still doing the same thing. It has somewhat of a "wheeze"when I accelerate and it really starts bucking and jumping in drive at around 2500 to 3000 rpms. Anything else I can check at home? My mechanic is apparently at a bowling thing in Montgomery, AL until Monday so I have a few days to troubleshoot before I go spend a bunch of money unnecessarily.
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Old 03-27-2015, 05:41 AM   #5 (permalink)
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Look at the instrument panel, is the "D" blinking? (Indicates the transmission is in drive)

Also - Even though the "Check Engine" light may not be on, the ECM remembers any codes that may have been set , then self cleared.

Do you have any ECM fault codes -?
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Old 03-27-2015, 06:53 AM   #6 (permalink)
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The "D" is there but it's never blinked even when it starts the jumping and bucking.

I haven't checked for any new codes since the check engine light went off. I guess I just kinda assumed that no codes would show if the light wasn't on. The only code I received when I checked was p0108. I plan on going to check it again today since you informed me it keeps the codes.

I did notice something though that I just thought of. It might be completely stupid and irrelevant but hey, you never know. When I was checking clamps on hoses and everything I removed the clamp between the throttle body and the big square plastic thing connecting to the top of it (excuse my layman's terms, I'm still learning automotive lingo plus I worked a ten hour overnight shift and haven't been to sleep yet lol) and there was some red melted-plasticy looking stuff all around the inside of the hose connecting the box to the throttle body and it looked like some was seeping out where it was connected. I just assumed it was some kind of sealant and it wasn't down in the throttle body or anything so I didn't think much of it. Could that be a sign I have a leak around that area? Maybe the guy that sold it to me did a quick fix just long enough to sell it? It's just a thought but I'm at my wits end with this car.
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Old 03-27-2015, 11:56 AM   #7 (permalink)
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The plenum (that big box that sits on the throttle body) has a habit of breaking where it connects to the throttle body. This air leak should not be causing your problem.

P0108 is a MAF sensor, but you said you replaced it.

Check for any stored codes.
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Old 03-27-2015, 01:58 PM   #8 (permalink)
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Thank you! Plenum. I couldn't figure out what that was called for the life of me lol!

I replaced the MAP sensor, not the MAF sensor. It was my understanding the 04 Forenza doesn't have a MAF sensor?

That's the only code I've gotten so far but I'm checking it again here in a little while. When I do I'll update.
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Old 03-29-2015, 07:31 PM   #9 (permalink)
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Update: No new codes popping up. Just dropped it off with my mechanic and he's thinking maybe its the fuel pump or catalytic converter. He made me a little nervous though because he said he doesn't have a lot of experience with Suzukis so it might be going to another shop after he gets done trying to figure it out.
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Old 04-04-2015, 03:53 PM   #10 (permalink)
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Update #2:
My mechanic can't figure out the problem but he's not the greatest at working on newer cars. The CEL came back on and said it was the EGR valve so he took it off, cleaned it, the light went off but the car is still doing the same thing. Its also now making a squealing noise like letting the air out of a balloon when I accelerate and it sounds like it's coming from under the car. Could it be the catalytic converter stopped up?
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