Question about 1998 Honda Civic

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1998 Honda Civic 1.6 5 speed - Error codes: po300, po302, p0304. Fuel pump pressure at idle = 35, higher rpm's around 45. Replaced plugs, wires, distributor cap, rotor, and fuel filter. Cleaned the fuel injectors. Idles perfectly after a cold start. Will run fine intermittently. Seems to misfire under load. Reminds me of the way a bad accelerator pump on an engine with a carburetor would act while accelerating. It will maintain a constant speed (had it up to 75) without a misfire until the load increases due to a hill, etc. After several miles, it will no longer idle, wants to stall but will easily restart.

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Man it sound like u needa replace the idle valve selenoid .. but try cleaning it with a sensor cleaner spray and then try it it will help trist me i did that to mine it worked

Posted on Jul 16, 2012

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When the distributer cap was removed did you check for oil in the distributer housing?

Posted on Jun 30, 2009

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COULD BE THE ENGINE CONTROL UNIT.
A PROBLEM FOR HONDA.

Posted on Jun 30, 2009

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2003 acura tl error codes po301 po302 po304 po306 p1399 po300


PO300 and P1399 are random cylinder misfire detected.
PO301 cylinder 1 misfire
PO302 cylinder 2 misfire
PO304 cylinder 4 misfire
PO306 cylinder 6 misfire
I would say that you have damage to the ignition wiring harness or you ECM is failing.

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Whats the valve clearance for my Diahatsu Mira 1998 850cc?


Mira 847 cc 1993- Engine Code ED 10
Ignition data
  • Ignition system type: El-ecu
  • Ignition coil make/type: Dia/-
  • Supply voltage: 12 + Volts with ballast resistor
  • Primary resistance: 1.35-1.65 Ohms
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  • Contact breaker gap/air: 0.2-0.4 mm
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  • Ignition Timing - leaded: Deg eng/rpm (without vacuum)
  • Timing mark location: Flywheel
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  • Spark plug type: WR6DC
  • Electrode gap: 0.7-0.8 mm
Fuel System
  • Fuel type: U/L
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  • CO level at idle speed: 1.0
  • 0.5 Vol %
Engine Data
  • Valve clearance - inlet: 0.25 mm (hot)
  • Valve clearance - exhaust: 0.30 (hot)
  • Compression pressure: 1.2-1.5 bar
  • Oil pressure: 2.5-5.6/3000 bar/eng/rpm
  • Radiator pressure cap: 0.6-1.05 bar/type
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Electrical System
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Other data
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  • it took me 3 seconds to google this then i realized that this is a older engine then yours

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1 Answer

2008chevy malibu misfire


Which code you have po300 or po301.po302 .PO301,PO302 will be coil or module.PO300 could be bad spark plugs,vac. leak,clog fuel filter,bad fuel pump,bad battery.

Feb 04, 2013 | 1996 Ford Crown Victoria

1 Answer

Po300 po302 po304 p1399


The number 2 and number 4 cylinders are misfiring.I would do a tune-up on it sparkplugs, plug wires, air filter and fuel filter.

Oct 29, 2012 | 1998 Honda Civic

2 Answers

02 hyundai accent engine quit running won t start codes come up po300 po301 po302 not familiar with 4 cylnders when turning over sounds like no compression


codes p 0300 is random misfires and codes p0301,2,3,4,5,6,7,8 are the cylinders that are misfiring
so un you statement the problem cylinders are 1 and 2
misfires are normally problem injectors and low fuel pressures so have the fuel pressure checked to make sure that the pump is running correctly, the pressure regulator is operating correctly ans the EVAP system is venting the tank correctly
use a couple of injector cleaner in the tank to clean the injectors

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2 Answers

98 gmc jimm 4x4 4.3l v6 replaced plugs, wires and distributor cap and rotor. Still getting P0304 code and rough idle. Higher rpms flatten out roughness but take off feels off. Any help??


spray carb/choke cleaner all around intake gasket mating surface on heads. (while motor is running) If rpms change you have a bad intake gasket.

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1 Answer

P0304 honda civic


P0304 Cylinder no. 4-Misfire Detected

This means that a plug, wire to the plug, or a fuel injector is not firing on this cylinder, or the compression is dead on it (not likely).

Aug 21, 2010 | 1998 Honda Civic

1 Answer

Honda 98 civic...check engine light came on P0304? how do i fix this car is running but it idles low and seems want to die down on me if driving it slow but on freeway it runs okey...my mechanic told me...


A P0304 code means that the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

A code P0304 may mean that one or more of the following has happened:

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Mar 10, 2010 | 1998 Honda Civic

4 Answers

5.3 L Missing and Rough Idle Intermittently


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