Need help in determining why my car is running rough

ROB77518

MEMBER
2006 SUZUKI VERONA
56,000 MILES

Hello if anyone can help it would be greatly appreciated my check engine light came on tellin me that 2 of my coil packs went bad so I changed those 2 out and my car does not have wire just coil packs and spark plugs took the plugs out and they are good then it said that my oxygen sensor is bad so changed that out but its still running real rough checked my hoses for leaks but like I said when I rev the engine it hesistates to get up to speed just tryin to see if anyone can help thanks

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

From your first post, you did not change the plugs. You should start with 2 things. Compression test and replace the plugs.
Stop replacing other parts till the basics are covered.
The o2 code came from the engine miss, the o2 was doing its job and asked for help.

Roy

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Friday, September 30th, 2011 AT 2:56 AM

ROB77518

MEMBER
9 POSTS

I already changed out the plugs along with the coil packs along with the o2 sensor

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Friday, September 30th, 2011 AT 3:02 AM

ASEMASTER6371

MECHANIC
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Compression? You stated in your other post you checked them and they were ok. I assumed you did not change them, sorry.

Compression is still pending.

Roy

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Friday, September 30th, 2011 AT 3:11 AM

ROB77518

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9 POSTS

And what exactly does compression mean

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Friday, September 30th, 2011 AT 7:51 AM

MHPAUTOS

MECHANIC
31,937 POSTS

A compression test is do to determine if there is sufficient compression when the piston reaches TDC, this is done with a gauge that screws into the spark plug hole, the compressions are read in PSI. Ideally you do not want more than 10% variation between cylinders, if a compression is low, this will cause a miss fire, rough idle, poor fuel economy and low power, the worse the compression the worse the symptom will be, compression test is a fairly easy task on most cars, this is a major diagnostic tool for tune related problems.