Misfiring problem. Always at 3800-4000 rpm under load ? ( gt28rs SOHC )
04-20-2006, 04:02 PM
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Re: (yellowturbo)
Under load huh.
Well since its compression, proper timing of the ignition and the correct air/fuel ratio to have a smooth running engine. How ever everyone has been mentioning its only under load. Sounds like a spark issue if you ask me. I had a similar issue where my spark plug fouled so i replaced them with new ones and re-gapped.
It did fix my problem, however you mentioned that you partial throttle it when underload then it acts up after you give it gas to accelerate.
Any check engine codes?
Do you know exactly what cylinder is misfiring?
A while back a customers crankshaft position sensor was bad and was the cause of misfiring however it occured at idle and under load.
From the honda website possible problems could be (DTC's applie to obd2 vehicles):
If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then
troubleshoot the misfire DTC.
P0171, P0172: Fuel metering
P0505: Idle Control System
P1361, P1362: TDC sensor
P1381, P1382: CYP sensor
P1508: IAC valve
Possible Cause
11-118 section 23 section 23 11-100 section 6 section 6
NOTE: If misfire doesn't recur, some possible causes are fuel that doesn't meet owner's manual spec, lack of fuel, carbon
deposits on spark plug, etc.
Fuel pump insufficient fuel pressure, amount of flow
Fuel line clogging, blockage, leakage
Fuel filter clogging
Fuel pressure regulator stuck open
Distributor malfunction
Ignition coil wire open, leakage
Ignition control module malfunction
Valves carbon deposit
Compression low
IAC valve malfunction
Fast idle thermo valve malfunction
Fuel does not meet Owner's Manual spec., lack of fuel
VTEC system malfunction
be back to post more, off work now
Well since its compression, proper timing of the ignition and the correct air/fuel ratio to have a smooth running engine. How ever everyone has been mentioning its only under load. Sounds like a spark issue if you ask me. I had a similar issue where my spark plug fouled so i replaced them with new ones and re-gapped.
It did fix my problem, however you mentioned that you partial throttle it when underload then it acts up after you give it gas to accelerate.
Any check engine codes?
Do you know exactly what cylinder is misfiring?
A while back a customers crankshaft position sensor was bad and was the cause of misfiring however it occured at idle and under load.
From the honda website possible problems could be (DTC's applie to obd2 vehicles):
If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then
troubleshoot the misfire DTC.
P0171, P0172: Fuel metering
P0505: Idle Control System
P1361, P1362: TDC sensor
P1381, P1382: CYP sensor
P1508: IAC valve
Possible Cause
11-118 section 23 section 23 11-100 section 6 section 6
NOTE: If misfire doesn't recur, some possible causes are fuel that doesn't meet owner's manual spec, lack of fuel, carbon
deposits on spark plug, etc.
Fuel pump insufficient fuel pressure, amount of flow
Fuel line clogging, blockage, leakage
Fuel filter clogging
Fuel pressure regulator stuck open
Distributor malfunction
Ignition coil wire open, leakage
Ignition control module malfunction
Valves carbon deposit
Compression low
IAC valve malfunction
Fast idle thermo valve malfunction
Fuel does not meet Owner's Manual spec., lack of fuel
VTEC system malfunction
be back to post more, off work now
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