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Old 06-20-2016, 10:31 AM   #1 (permalink)
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Default Suzuki Forenza Misfires and revving problem.

Alright, so here's the story. About a month and a half ago, I replaced the spark plugs on my 2007 Suzuki Forenza. NGK brand. And about a week and a half ago, I did an oil change and replaced the oil filter, since my car used to be my parent's car, and they rarely did anything for it, no maintenance, nothing. Anyways, I replaced the filter with a Napa gold filter, added 5w-30 Synthetic Castrol oil, added 4 quarts, and yes, I did drain the old oil. The next day, as my mother was "borrowing" it to go to work, she said that as it was going uphill, the car made a thunk noise and lurched forward, then she felt the car lose power dramatically. So later that day, I took it for a run, then I felt the car not accelerate even with the pedal all the way down. Then the check engine light came on and it gave me 5 codes. The codes were p0300, p0301-p0304, and p0314. I checked first the spark plugs to see if they were the problem of the misfires, and thing is that they looked a bit worn out already. And I was wiping down my spark plug wires, and they broke, and they didn't look too bad. So I ordered some new spark plug wires, and I replaced the old ones with those and I put back the spark plugs. Now I felt the car have a bit more power, but I can tell it's still misfiring, and when my car shifts, it lurches forward a bit. I know this isn't the transmission range sensor, because it doesn't stay stuck on third gear when I put it into drive, and I know the symptoms of that, I've replaced it twice. Anyways, That happened and now, when in drive and not accelerating, the rpms rev up from 500 to about 1200 rpm, and it does the same on park. Any ideas why? And why only after I replaced the engine oil? Please Help, I'm a bit lost.
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Old 06-20-2016, 11:50 AM   #2 (permalink)
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The P0134 is an O2 code no signal...

Check that the B1S1 is still connected, is not against exhaust and is not coated with oil...
Are the HT wires on the correct plugs??

What did you mean "wiping down my spark plug wires, and they broke"?

Might be easier if you tell us which engine you have and where you are...

... Philip
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Old 06-20-2016, 11:57 AM   #3 (permalink)
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The surging (know as hunting), is the ECU attempting to control the idle.. most often a maladjusted TPS..

However you seem to have several issues, fix the misfires first...

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Old 06-20-2016, 02:40 PM   #4 (permalink)
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Well, I pulled my old spark plug wires off of the spark plugs and I was gently wiping the dirt off of them with a towel and the boot just tore apart.
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Old 06-20-2016, 03:00 PM   #5 (permalink)
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I live in New Mexico, so it's a lot of hills here, and my engine is the 4 cyl Forenza engine. It's has about 145k miles on it.
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