ENGINE MISSFIRES. EGR VALVE? FUEL PUMP?

  • Tiny
  • BigJ2007
  • Honda Accord

1999 honda accord 4 cyl vtec 130000
i had error codes read, said the engine is missfireing, I changed the plugs and wires. Next thing I was told to check was the egr valve, and the fuel filter. Found out there is no fuel filter to change, but there is a pump. And then was told I shouldnt do this myself. Is it that bad? The car runs but it shakes bad. Please any help out there?

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Tuesday, August 21st, 2007 AT 9:22 PM

11 Replies

  • Tiny
  • rasmataz
  • Member

What code/s are they?

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Tuesday, August 21st, 2007 AT 10:07 PM
  • Tiny
  • BigJ2007
  • Member

They are p0302, p0304, p0401, p0300, p1399, p0401. I cleared all of them ran it again for 5 min and scanned it again now it has P0302, P1399.

What should I do?

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Thursday, August 23rd, 2007 AT 4:53 PM
  • Tiny
  • rasmataz
  • Member

1399 is your engine diesel?

Open up the EGR inspect/clean/test-rescan it and comeback

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Thursday, August 23rd, 2007 AT 5:14 PM
  • Tiny
  • BigJ2007
  • Member

It is not a diesel, it I s a 4 cyl vtec. I am going to try right now. What should I be looking for? Buildup?

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Thursday, August 23rd, 2007 AT 6:09 PM
  • Tiny
  • rasmataz
  • Member

Carbon build up check the passages also make sure its getting vacuum

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Thursday, August 23rd, 2007 AT 6:13 PM
  • Tiny
  • BigJ2007
  • Member

I cleaned it out there was a lot of carbon, didnt help any, rescanned, p0300, p0301, p0304, p1399. Where should I look to check the vacuum?

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Thursday, August 23rd, 2007 AT 6:39 PM
  • Tiny
  • rasmataz
  • Member

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

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Friday, August 24th, 2007 AT 5:02 AM
  • Tiny
  • BigJ2007
  • Member

Well I changed the egr valve, no dice. Ill check the compression and fuel pressure. If its the compression, what would be my next step?

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Friday, August 24th, 2007 AT 10:19 PM
  • Tiny
  • rasmataz
  • Member

I would say concentrate on the fuel in your situation

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Friday, August 24th, 2007 AT 10:26 PM
  • Tiny
  • BigJ2007
  • Member

Its a "dead cylinder". Im gonna sell the car for $1000 as-is. Then im gonna go buy a dodge charger. Thank you so much for your help!

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Monday, August 27th, 2007 AT 7:38 PM

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