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Guess what?

01-25-2005, 06:49 PM
its a 97 honda civic hx
check engine light came on again today
P0301 misfire detected cylinder 1
P0302 " " cyl. 2
P0303 " " cyl. 3
P0304 " " cyl. 4
P1300 dont know
P1399 manufacture controlled igntion system or misfire (pending code)

The spark plugs are gapped to specifications
The distributor and cap are in excellent shape
The timing is within specifications which is at 13 degrees

Still can't figure it out??? Any ideas?

01-27-2005, 12:19 AM
valve and vaccuum problems can cause misfires too.

01-27-2005, 04:25 AM
map sensor and tps are not reversed? all connectors are firmly clamped on the terminals of the ICM using needle nose pliers? you still never answered if you checked your coil? im assuming when you say you checked your timing, there are also no noticable pauses in flashes. you checked injectors? hows the idle? hows the fuel pressure? dont forget to check what GScivic7 mentioned.

big bad mohawk guy
01-27-2005, 08:06 AM
get a b18 vtec

01-27-2005, 11:49 AM
get a b18 vtec
how about you shut the fuck up if you don't having anything relevant to add to the tread :disappoin

01-28-2005, 01:46 AM
Thanks for adding to the AF community, with your informative posts.

01-28-2005, 01:53 AM
Here is a start:

The scan tool indicates Diagnostic Trouble Code (DTC) P0301: Cylinder 1 misfire detected.

Misfire detection is accomplished by monitoring the crankshaft speed with the crankshaft speed fluctuation (CKF) sensor which is attached to the crankshaft.
If misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and DTC P0301, P0302, P0303 or P0304 will be stored. Then, after the misfire has ceased, the MIL will come on.
If misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and DTC P0301, P0302, P0303 or P0304 will be stored.

NOTE: If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then recheck for the misfire DTC.

P0106*4, P0107, P0108, P1 128*3, *5, P1 129*3, *5: MAP sensor
P0131, P0132: HO2S
P0171, P0172: Fuel supply system
P0335, P0336: CKF sensor
P0401, P1491, P1498: EGR system
P0441: EVAP system Insufficient purge flow*6
P1359, P1361, P1362: TDC sensor
P1381, P1382: CYP sensor

*4: '96 models
*6: '96 D16Y5 engine, '96 D16Y7 engine, '96 D16Y8 engine (sedan), '97 D16Y5 engine, '97 D16Y7 engine (coupe: KA, KC models, sedan KA, KC, KL (DX) models, hatchback: all models), '97 D16Y8 engine (sedan: KA, KC models)

Possible Cause

Fuel injector clogging, fuel leakage, air leakage
Fuel injector circuit open or shorted
Spark plug carbon deposits, fouling, malfunction
Ignition wires open, leaking
Distributor malfunction
Compression low
Valve clearance out of spec
VTEC system malfunction (D16Y5, D16Y8, B16A2 engine)
HO2S circuit

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