Question about 1998 Honda Accord
It is throwing mifire code for all 4 cylinders. I have replaced distributor cap, rotor, coil and ignition module, but when you get on it it still throws code at about 60 mph and won't accelerate past that until you let of and hit it again. what am I missing?
First I suggest scanned the ECU. The misfire counter function can help you determine which cylinder is behaving badly. Clearly this is not an option for all people and vehicles though.
NOTE: Even without engine scanners you can identify which cylinder is causing a dead misfire. Carefully disconnect one spark plug at a time. If the cylinder you are disconnecting is operating properly you will hear a change in RPM. If the cylinder you disabled is the bad cylinder you will see no change in engine behavior.
Check your ignition system. There are several steps to this.
- Remove spark plugs and check to see if the electrodes look worn down or contaminated. Check your spark plug gap with a plug gapper to see if the electrode has worn down.
- Use a multimeter to check your spark plug wire resistance. They should read roughly between 2,000 - 12,000 Ohms. What you are really looking for is an open circuit in one of the wires. Bend the wires around and see if you lose continuity.
- Check cap and Rotor. Look for carbon tracking or extremely worn down rotor.
- On newer vehicles with distributeless ignition systems coils are prone to failure. If you know which cylinder is misfiring try swapping that cylinder's ignition coil with another cylinder and see if the misfire moves with it.
If you know your ignition system is operating properly you may want to check compression. You may already have the spark plugs out from your ignition check so it only takes a minute to check engine compression.
Fuel injection Service - The motorvac service works miracles. It is available at most repair facillities. Adding a can of fuel injector cleaner to your fuel tank is not ecnough to clean out a severely plugged injector. The motorvac solvent is much more potent and should only be used with a fuel injection cleaning machine. It is a good place to check with a hard to find misfire.
Vacuum leaks - A vacuum leak will cause a misfire. If the leak is near a certain cylinder that cylinder will misfire. You can try to find a leak by spraying down the engine carefully with carb cleaner. If you spray the location of the leak the RPMs will rise. You can also inject the intake manifold with smoke from a smoke machine and look to see if it leaks out anywhere it is not supposed to.
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Posted on Feb 17, 2012
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Posted on Jan 02, 2017
SOURCE: 1992 honda accord xe
If your car is fuel injected it may be the throttle position sensor, (TPS) hook up a DVOM and check that voltage output of sensor is steady closed to open throttle, since 35MPH is near closed throttle, that is were to focus your attention, also the mass air flow meter (MAF) may be at fault, do you have any codes? These 2 parts donot as a rule set codes.
Posted on Jul 17, 2008
Horsecrap...go to an independent transmission dealer after you call the extended warranty folks and complain!
I can count the number of Honda transmissions that go bad before 300,000 miles on one hand.
Posted on Jun 22, 2009
SOURCE: vibration at 60 mph
The first thing to have checked is the wheel balance, if they are good then you need the brake system and wheel bearings checked. Please let me know if this does not help as there are a few more specific problems that could cause vibration.
Posted on Oct 27, 2009
The P1259 : is problem in the VTEC Oil Pressure Switch circuit or VTEC Solenoid Valve circuit.
check the wire on the VTEC Oil Pressure if it's loose.
Posted on Mar 22, 2010
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