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saiko · 05-08-2018, 08:45 PM

Looking for some advice / help.

2004 Honda Civic SIR (K20a3, motor apparently has 135k km, replaced by PO, body has 280k).
- car has an aftermarket exhaust and an aftermarket intake.

CEL on, codes say misfiring cylinder 1, 2, 3 and 4. Cannot reach past 5k RPM either in neutral or in gear and under load. Engine has power (not a lot) up to 5k RPM but falls flat. I tried revving the engine in neutral and it felt like it hit a redline protection at 5k. (bouncing).

Codes:
P0301, P0302, P0303, P0304.

My first time tinkering this much with a car on my own. Did the following:
- Open Valve Cover to check timing between cam gear and chain, looks to be aligned based on what I read (the dots, arrows and lines on the gears).
- Performed a compression test, bought a compression test gauge. I don't know how to tell on the K20a3 motor which cylinder is 1,2,3,4.
- From left to right passenger side to driver side (cam gear onward) it read 165psi, 175psi, 170psi, 175psi. I have a feeling my first time using the gauge is not accurate or the gauge quality sucks.
- the spark plugs looked dry. 3/4 plugs are "tar'd" and burnt, 1/4 plug was clean.
- The car idles perfectly fine, with AC on, accessories turned on, no problem. No surging.
- Engine oil is topped up.
- Car does not blow smoke on start up or smell rich.

Ran another CEL scan after resetting it and it is now only showing P0303 No. 3 Cylinder Misfire

I don't know what to try next. Was going to meet with a friend who has a RSX Type-S to see if we can swap MAP sensors? Try new coil plugs? New spark plugs?

Thank you in advance for taking the time to read. I may bring the car in for professional help but wanted to exhaust whatever basic troubleshooting I can do/try.

05-08-2018, 08:45 PM	#561
saiko easy e Join Date: Jul 2004 Location: burnabee Posts: 3,593 Thanked 111 Times in 48 Posts Failed 9 Times in 6 Posts	Looking for some advice / help. 2004 Honda Civic SIR (K20a3, motor apparently has 135k km, replaced by PO, body has 280k). - car has an aftermarket exhaust and an aftermarket intake. CEL on, codes say misfiring cylinder 1, 2, 3 and 4. Cannot reach past 5k RPM either in neutral or in gear and under load. Engine has power (not a lot) up to 5k RPM but falls flat. I tried revving the engine in neutral and it felt like it hit a redline protection at 5k. (bouncing). Codes: P0301, P0302, P0303, P0304. My first time tinkering this much with a car on my own. Did the following: - Open Valve Cover to check timing between cam gear and chain, looks to be aligned based on what I read (the dots, arrows and lines on the gears). - Performed a compression test, bought a compression test gauge. I don't know how to tell on the K20a3 motor which cylinder is 1,2,3,4. - From left to right passenger side to driver side (cam gear onward) it read 165psi, 175psi, 170psi, 175psi. I have a feeling my first time using the gauge is not accurate or the gauge quality sucks. - the spark plugs looked dry. 3/4 plugs are "tar'd" and burnt, 1/4 plug was clean. - The car idles perfectly fine, with AC on, accessories turned on, no problem. No surging. - Engine oil is topped up. - Car does not blow smoke on start up or smell rich. Ran another CEL scan after resetting it and it is now only showing P0303 No. 3 Cylinder Misfire I don't know what to try next. Was going to meet with a friend who has a RSX Type-S to see if we can swap MAP sensors? Try new coil plugs? New spark plugs? Thank you in advance for taking the time to read. I may bring the car in for professional help but wanted to exhaust whatever basic troubleshooting I can do/try. __________________ My Feedback Go CANUCKS!!