HELP to solve: Engine misfires, ECL
#1
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Location: Mississauga, ON, Canada
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HELP to solve: Engine misfires, ECL
I have Honda Civic SI '98 (109,000km)
Recently got CEL (Check Engine Light), took it to honda shop to have it tested
result: PGM misfire codes detected PO302, PO304;
They recommended to start with sprk plugs,
Replaced spark plugs Bosh Platinium
Problem persists, sputters a bit between 2500-3000 RPM and more over 3000.
OK on lower rpm,
Please provide me with the checklist of other potential mulfunctioning components.
Thanks in advance
les_sos
Recently got CEL (Check Engine Light), took it to honda shop to have it tested
result: PGM misfire codes detected PO302, PO304;
They recommended to start with sprk plugs,
Replaced spark plugs Bosh Platinium
Problem persists, sputters a bit between 2500-3000 RPM and more over 3000.
OK on lower rpm,
Please provide me with the checklist of other potential mulfunctioning components.
Thanks in advance
les_sos
#2
Re: HELP to solve: Engine misfires, ECL (les_sos)
was there an o2 sensor code too? I know that honda put out a TSB on a common problem with a wire shorting out on the back side of the intake manifold that was throwing CEL. Do you have access to this info?
#3
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Re: HELP to solve: Engine misfires, ECL (95b16hatch)
No, I do not. The only thing on the report is:
"PGM MISFIRE CODES PO302, PO304. REC START WITH SPARK PLUGS and RE ROAD TEST, REST ECU"
I replaced SPARG PLUGS and RESET ECU but problem continues.
r,
les_sos
"PGM MISFIRE CODES PO302, PO304. REC START WITH SPARK PLUGS and RE ROAD TEST, REST ECU"
I replaced SPARG PLUGS and RESET ECU but problem continues.
r,
les_sos
#4
Honda-Tech Member
Re: HELP to solve: Engine misfires, ECL (les_sos)
Are Bosch Platinum spark plugs the actual stock spark plugs for that engine? If not, get the correct plug. Your Si is our Ex, correct? Our Ex doesn't use those plugs.
What about the other ignition components? Cap, rotor, and wires? Have you run some injector cleaner through it lately?
Does the car have any mods or did you do any maintenace recently?
What about the other ignition components? Cap, rotor, and wires? Have you run some injector cleaner through it lately?
Does the car have any mods or did you do any maintenace recently?
#5
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Re: HELP to solve: Engine misfires, ECL (les_sos)
No, mods;
Yes , Canadian SI is eq. to US EX
The car was for the routine maint .checkup 108,000km (67,500mi) just when after the first ECL showe-d up.
Did not run any injector cleaner nor checked cap, rotor or wires.
The plugs are not the type recommended in owners manual.
I'll need to do it tonight
r,
les_sos
Yes , Canadian SI is eq. to US EX
The car was for the routine maint .checkup 108,000km (67,500mi) just when after the first ECL showe-d up.
Did not run any injector cleaner nor checked cap, rotor or wires.
The plugs are not the type recommended in owners manual.
I'll need to do it tonight
r,
les_sos
#7
Honda-Tech Member
Re: HELP to solve: Engine misfires, ECL (les_sos)
So are the cap and rotor original? As in, they too have 67,500 miles on them? They are way overdue for a service change, if yes. The wires should probably be changed too, but the cap and rotor need some attention if it's original stuff.
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#8
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Re: HELP to solve: Engine misfires, ECL (les_sos)
Yes, Cap & Rotor & wires are original stuff. I get a replacement and recomended s.plugs & see if that helps.
Thank you for recommedations.
R,
leas_sos
Thank you for recommedations.
R,
leas_sos
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