Honda B20A ECU CEL Code Error

Honda B20A ECU CEL Code Error

Honda Prelude B20A Water Pump Pipe Replacement

This time I'd like to share some experience to replace corroded water pump pipe.

First remove exhaust as in the photo.
This will give some space to replace water pump pipe.

And the 2 intake mounts.

The 2 intake mounts.

Cut the hard to remove hose.
Make the job more faster.
Just replace with new hose.
Save time and save sweat.

The old and new water pump pipe.

Local made.

Corroded water pump.
It just running for 30,000km.
I installed it with timing belt kit.

Close picture.
Clean it as clean as possible.
Limited view to see with eyes.
I used phone camera to take this picture.

Picture with water pump pipe removed.

The right one is from Mitsubishi Pajero V6.

Use gasket maker to seal the water pump pipe.

For other hose, use grease to protect the pipe and avoid hose to stick hard to pipe.

You can use pipe clip or standard car clip to hold the hose.
They have pro and cons.

Tight enough to hold the hose.

Replace all hose for assurance the cooling system.
Hose is cheap.
Dont repeat the same repair.
Do it in package.

For reference Honda B20A.

Honda B20A Prelude FIV and EACV Operation

Honda B20A Prelude FIV and EACV Operation During Cold

During cold FIV open and EACV also open...
In this video, both FIV and EACV opens.

Honda B20A Prelude FIV and EACV Operation During Hot

During Hot FIV close and EACV will control idle...
In this video, the FIV have some leaking.
It is not supposed to let any air into intake.

FIV operation depends on coolant temperature (mechanically).
while EACV operated by ECU...(electronically)

Honda B20A Valve Clearance Adjustment

Hi All,

If you hear some knocking from valve cover, 
most probably the valve clearance needs re-adjustment as the gap is increase due to wear and tear.
Using good lubricant oil will prevent the gap from increasing.
In Malaysia, i recommend JTX1000 as it has EP/AW Extreme Pressure / Anti-Wear.
JTX1000 really can save a lot of money due to engine protection and less maintenance.
Buy JTX1000 before you buy new vehicle.

Feeler gauge brand King Toyo model KT-FG25M.
For easier process, take out the necessary blade.
For this B20A Honda Engine, you can refer to photo.
0.08-0.09 for intake
0.16 (0.10+0.06)-0.17(0.10+0.07) for exhaust.
For exhaust, the feeler gauge doesn't have the 0.16-0.17.
So i add up 2 blades to make gauge blade.

Remove the necessary and valve cover.

I recommend the timing belt shall be cover with paper or any clean material.
Protect it from any oil.


Turn steering to the left.
Use socket bolt sized 17 to turn the crankshaft.
Turn Anti-Clockwise to get the each cylinder on top position.
No ClockWise Turn as it will stretch the timing belt.

Some short note for guide.
Avoid any mistake and finest adjustment.

I used ratchet to loosen as old sludge jammed the thread.

Easy to adjust compared to H22A.
H22A needs some special tool.
Loosen the nut and adjust the center screw.

For this example(intake valve), adjust until the 0.08 feeler gauge blade can slightly move in and out.
Make sure 0.09 is unable to move in between.

You have total 16 valves clearance to adjust.
Slow and accurate will be worth it.

Good Luck!

Some videos.. before and after adjustment...

Honda Prelude Thermostat Replacement

Hi All DIYers...
Luckily the thermostat is suspected stucked closed.
That leads to this DIY creation to help others.

When the temperature is over half of the gauge, the fan will not turned ON.
To test the fan and switch, you can refer to the past DIY 

The lower hose or lower radiator cover is COLD enough to touch while the upper hose is HOT.
The temperature keep rising and you can hear weird hot water sound.

This is where the thermostat LIVE.
Need to loose only 2 BOLT sized 10. Easy enough.

Gently pull thermostat out by using flat screwdriver.

Never use tap water. The corrosion is minimal.

To confirm the thermostat is faulty, boil it in a water.
In this photo, it will never open.

19301-P08-316 Honda Thermostat.
Comparable with local one.

On the left is new Honda genuine thermostat.
While on the right is local one.
The local looks similar with genuine except the middle rubber valve.
FYI the local failed after 2 years or 30000.
Maybe the different material.

Softer springs.

A bit harder springs for local.

Test/boil it out before put it back into thermostat housing.

Open when Hot!

Close when Cold!

Clean the housing before put it back.
Follow marking on top or it will not fit.

Put some thin silicone gasket (optional but recommended).

Tighten the bolts.

Wipe off the excessive silicone gasket.

Reference. Click for bigger view.

Good Luck!