guess my motor problem.
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Honda-Tech Member
Joined: Dec 2001
Posts: 186
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From: The Buckeye State
guess my motor problem.
stock civic vx motor, D15Z1 with 176K miles.
Cyl. #3 is not firing.. I can pull that plug wire with the motor running and nothing happens. (it runs rough to begin with). Any other plug wire pulled will kill the motor.
I made sure the #3 injector was clicking, and I swapped injectors with another cylinder to no avail. The plug wire arcs to the valve cover when pulled.
Compression results are:
(engine warm, WOT)
185, 180, 125, 175... 1,2,3,4 respectively.
after a cap of oil in each cylinder:
225, 210, 165, 200
I dont have a leakdown gauge set, but I pressurized each cylinder, and the results were:
Cyl.1: Blows air through the oil passages.. filler hole and dipstick hole
Cyl2: Tight. yay.
Cyl3: Blows air through spark plug holes and exhaust
Cyl4: Blows air through spark plug holes. (if those are plugged, slight air can be heard through the intake.
Any diagnosis? I have a topic going about this in the civic forum, but I wanted to present it to the techies of the board and see what the consensus is. I just want a reliable stock motor for daily driving. I am trying to get an idea if the head needs work, bottom needs work, or if I should just swap an entire motor and start fresh.
Cyl. #3 is not firing.. I can pull that plug wire with the motor running and nothing happens. (it runs rough to begin with). Any other plug wire pulled will kill the motor.
I made sure the #3 injector was clicking, and I swapped injectors with another cylinder to no avail. The plug wire arcs to the valve cover when pulled.
Compression results are:
(engine warm, WOT)
185, 180, 125, 175... 1,2,3,4 respectively.
after a cap of oil in each cylinder:
225, 210, 165, 200
I dont have a leakdown gauge set, but I pressurized each cylinder, and the results were:
Cyl.1: Blows air through the oil passages.. filler hole and dipstick hole
Cyl2: Tight. yay.
Cyl3: Blows air through spark plug holes and exhaust
Cyl4: Blows air through spark plug holes. (if those are plugged, slight air can be heard through the intake.
Any diagnosis? I have a topic going about this in the civic forum, but I wanted to present it to the techies of the board and see what the consensus is. I just want a reliable stock motor for daily driving. I am trying to get an idea if the head needs work, bottom needs work, or if I should just swap an entire motor and start fresh.
Joined: May 2005
Posts: 1,789
Likes: 1
From: Simi Valley, CA, USA
Re: guess my motor problem. (LoudLude)
Well, that's a lot of **** going on, but a fresh valve job would solve the problem of air going out through the closed intake/exhaust ports. That would be my first step.
But, with a motor that old, I'd junk it. It basically needs a complete rebuild with that kind of mileage. I bet your valve seals, valve guides, and piston rings are all toast. I don't know how I'd justify spending any kind of money fixing up a 175k mile Z1 motor. Ick.
But, with a motor that old, I'd junk it. It basically needs a complete rebuild with that kind of mileage. I bet your valve seals, valve guides, and piston rings are all toast. I don't know how I'd justify spending any kind of money fixing up a 175k mile Z1 motor. Ick.
Thread Starter
Honda-Tech Member
Joined: Dec 2001
Posts: 186
Likes: 0
From: The Buckeye State
Re: guess my motor problem. (EnzoSpeed)
I know what you mean, and its definitely an option....
But if everyone agrees the head needs the most attention, I may just have it rebuilt and be done with it until it totally dies.
But if everyone agrees the head needs the most attention, I may just have it rebuilt and be done with it until it totally dies.
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