help cel throwing 5 diff codes
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Honda-Tech Member
Joined: Apr 2004
Posts: 57
Likes: 0
From: batavia, oh, United States
help cel throwing 5 diff codes
so I just bought my first 99 prelude this week. previous integra owner. but it does have a exhaust leak, has a 2 piece megan header on it and its leaking where the 2 pieces bolt together. but its throwing 5 diff cel codes.
p0141- bank1 o2 sensor 2
p0301- cylinder 1 misfire
p302 cylinder 2 misfire
p0304 cylinder 4 misfire
p0300 random multi cylinder misfire
I replaced the plugs, distributor cap and rotor button today. it seemed to make it run a little better but it still has the misfire. its mainly at low idle and when im just running down the highway at 65 and barely touching the gas or let off the gas. but when I press down on the gas decently it seems to go away or if I just floor it runs just fine except for the exhaust leak. I ordered the gasket for it today since I couldn't get it at honda or any auto parts store because its an aftermarket header. so do you think once I fix the exhaust leak that it will fix the misfire or is it something else like maybe the coil or something. the car has 118k on it.
p0141- bank1 o2 sensor 2
p0301- cylinder 1 misfire
p302 cylinder 2 misfire
p0304 cylinder 4 misfire
p0300 random multi cylinder misfire
I replaced the plugs, distributor cap and rotor button today. it seemed to make it run a little better but it still has the misfire. its mainly at low idle and when im just running down the highway at 65 and barely touching the gas or let off the gas. but when I press down on the gas decently it seems to go away or if I just floor it runs just fine except for the exhaust leak. I ordered the gasket for it today since I couldn't get it at honda or any auto parts store because its an aftermarket header. so do you think once I fix the exhaust leak that it will fix the misfire or is it something else like maybe the coil or something. the car has 118k on it.
Honda-Tech Member
Joined: Sep 2012
Posts: 717
Likes: 24
From: Kuopio, Finland
Re: help cel throwing 5 diff codes
really depends about your maintenance history
Originally Posted by Timik
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: Apr 2004
Posts: 57
Likes: 0
From: batavia, oh, United States
Re: help cel throwing 5 diff codes
I really don't know about the maintenance history. I just bought the car like 4 days ago. the exhaust def. smells like gas pretty bad
Honda-Tech Member
Joined: Nov 2007
Posts: 982
Likes: 1
From: Lake Wylie, SC, USA
Re: help cel throwing 5 diff codes
It probably needs the EGR ports cleaned. If it's got over 110K miles, then it definitely needs done.
DIY here https://www.preludepower.com/forums/....php?p=1436304
DIY here https://www.preludepower.com/forums/....php?p=1436304
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