00 automatic misfiring mystery, Please help!
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00 automatic misfiring mystery, Please help!
I just picked this prelude up cheap, about two months ago. It was doing all kinds of nasty stuff when I first picked it up, like misfiring badly, and pre detonating. She had 183,000 miles. So far I have changed the plugs, ( NGK Irritium x) wires, (also NGK) valve cover gasket ( two plugs were submerged in oil) cap, rotor, catalytic converter, air filter, knock sensor, rear hub assembly, changed the oil, and tyranny fluid. All in all she runs great, has virtually no rust, and handles great. I like this car a-lot...other then the automatic trans...I really don't like the trans much, but what could I do...I got her for under a grand.
Now for my issue...every once in a while I get a flashing cell, while driving at low speeds. When the cell is flashing, I feel no loss of power, or misfire of any kind ( If I didn't see it flashing...I would not know anything is wrong) the codes are P0301 and P1399. I know P0301=cylinder 1 misfire, and P1399=random multiple cylinder misfire. Anyone have an idea of what would be the most likely culperate? Could this be a clogged egr port, even though there is no egr code? Could this be caused by a vacuum leak? Could I have a fuel delivery problem? I know this problem could be caused by quite a few things. Thanks in advance for any help.
And, before someone asks, yes I fill up with premium gas.
Now for my issue...every once in a while I get a flashing cell, while driving at low speeds. When the cell is flashing, I feel no loss of power, or misfire of any kind ( If I didn't see it flashing...I would not know anything is wrong) the codes are P0301 and P1399. I know P0301=cylinder 1 misfire, and P1399=random multiple cylinder misfire. Anyone have an idea of what would be the most likely culperate? Could this be a clogged egr port, even though there is no egr code? Could this be caused by a vacuum leak? Could I have a fuel delivery problem? I know this problem could be caused by quite a few things. Thanks in advance for any help.
And, before someone asks, yes I fill up with premium gas.
Honda-Tech Member
Joined: Sep 2012
Posts: 718
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From: Kuopio, Finland
Re: 00 automatic misfiring mystery, Please help!
quick what to do list
usually these things fix bad idle or/and hesitations:
- new spark plugs & wires
- new distributor cap & rotor
- new air/fuel filters
- clean injectors/iacv/egr/fitv
- bleed the coolant
- new pcv
- adjust valves and ignition
- adjust idle from tb's screw and throttle cable
- check does sensors work properly: map, iat and tps (and try calibrating tps)
- then check wires, connectors and hoses
- check ICM and ignition switch (there was 5th gen repair call for this also)
check o2 sensors and vacuum/exhaust leaks (check all the seals - IM/header/TB gaskets, injector seals, maybe even buy valve cover gasket set...)
check timing. after that: double check timing
clogged cat might you give some trouble as well (usually when driving) - check cats condition
if none of these seem to work - do compression and leak tests
and if you have chipped ecu and youre running it just with basemap, it might not work as well than properly tuned one
those are basic maintenance as well.
usually these things fix bad idle or/and hesitations:
- new spark plugs & wires
- new distributor cap & rotor
- new air/fuel filters
- clean injectors/iacv/egr/fitv
- bleed the coolant
- new pcv
- adjust valves and ignition
- adjust idle from tb's screw and throttle cable
- check does sensors work properly: map, iat and tps (and try calibrating tps)
- then check wires, connectors and hoses
- check ICM and ignition switch (there was 5th gen repair call for this also)
check o2 sensors and vacuum/exhaust leaks (check all the seals - IM/header/TB gaskets, injector seals, maybe even buy valve cover gasket set...)
check timing. after that: double check timing
clogged cat might you give some trouble as well (usually when driving) - check cats condition
if none of these seem to work - do compression and leak tests
and if you have chipped ecu and youre running it just with basemap, it might not work as well than properly tuned one
those are basic maintenance as well.
Thread Starter
Honda-Tech Member
Joined: May 2018
Posts: 41
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Re: 00 automatic misfiring mystery, Please help!
Well it has a new cat, plugs, wires, cap, rotor, valve cover gasket, air filter, and knock sensor. I guess I will change the pcv, change the fuel filter, do a valve adjustment, check the timing, check the injectors...and go from there.
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