'99 Accord misfire

Tiny
MDL115
  • MEMBER
  • 1999 HONDA ACCORD
I have a '99 4L Accord DX, 5 spd manual. The check lamp had been lit then started blinking, with noticable loss of power, enginie missing in fifth gear. Then began roaring like muffler was shot. Mechanic diagnosed cat gasket and replaced. Car runs almost normally, but runs rough while idling and in low gears. Don't notice miss at highway speeds. Check light still intermittently blinking/or just lit. Comes back with misfire diag code. Mech suggested a tune up, then after testing plugs advised that it's a compression problem and could be a valve. Suggested replacing motor is only fix due to high miles. Someone else mentioned the ignition coil as a possible problem. Car has 200k miles but was running perfectly before initial problem. Will an ignition coil cause the misfire code? Should I have a compression test done? Thanks.
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Sunday, September 9th, 2007 AT 5:33 PM

3 Replies

Tiny
BRUCE HUNT
  • EXPERT
Bad plug wires could cause the problem. How old are the. Coil I would rule out. If you wish to get a test on the engine, I would recommend a leak down test. Do a google search on it. It is a rather inexpensive but great finger pointing tool to determine what is happening. You might try pulling the plugs and see what they have to tell. Do they look the same, are they burning black, etc.
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Monday, September 10th, 2007 AT 9:36 AM
Tiny
MDL115
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Thanks for the reply Bruce. Had a tune up about 10 mths ago. The mech checked the plugs and wires and said are fine. The diags come back with the codes: P0300, 0301, 0304, 0303, cylinder misfire codes for #'s 1, 3, 4, and "random cylinders".
Also, since this problem occurred car sometimes hard-starts, sometimes catches immediately - as it always has in the past. At one point yesterday, it sounded like it wasn't going to start, finally started weakly, and idled very low for several seconds.
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Tuesday, September 11th, 2007 AT 3:41 PM
Tiny
BRUCE HUNT
  • EXPERT
Even if it is a compression problem, which I am unsure of, it would still cause consistant pressure. A valve is a possible but again that would be consistant. Mechanical items are usually very consistant in nature. They may were out or break but when they wear it is usually a slow over time process. I am lost between thinking this could be a fuel delivery issue or an intermittent electrical problem. I suspect the injection system based on your comment about the poor starting. Loss of pressure at the injectors due to a leak can cause misfire and when the car tries to start it needs to repressurize the system. I think I would be starting with this first.
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Wednesday, September 12th, 2007 AT 9:27 AM

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