Replaced head gasket
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Replaced head gasket
We replaced the headgasket on a 2000 civic with a d16y8 engine. Got it back together and wont start. We are currently checking for spark and timing but found a broken plug. It was hanging down by the oil filter and has a green plastic with what looks to be a probe inside. Anyone know what this is and if it is crucial to starting?http://s58.photobucket.com/user/85deuce/library/Mobile%20Uploads?sort=3&page=1
Last edited by 85deuce; Jul 4, 2016 at 10:19 AM.
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Re: Replaced head gasket
Looks like half of an oil pressure switch (does the idiot light work or not?) or half of a knock sensor (got a fault code?)
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Yup. Found the knock sensor and its broken don't think that would cause no start though. Looks like we dont have spark. We pulled the timing belt off the cam gear and slid it back over and really feel it could only go on one way. If it is off a tooth would that kill spark?
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If it is off a tooth would that kill spark?
Bad ignition coil? Got dwell?
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From: Midwest. Aiming about mid-chest
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A dwellmeter can be used to determine if the ICM (Igniter) is trying to fire the coil or not.
Same dwellmeter was used for checking and adjusting ignition points in an OLD cars distributor.
Quick check:
Remove dist cap, check for spark output directly from the coil tower.
How big of a lightning bolt can it produce?
Attach a ground wire to a screwdriver, hold it against the tip of the tower, have someone crank it and slowly pull the screwdriver away to see how much spark can be produced.
If it can throw a spark across a 3/4 inch gap, that's great. If it can barely spark a gap of 1mm, that coil is bad (but the system is trying to fire the coil so the rest of the dist is ok)
If zero spark is seen, then I get out the dwellmeter to see if the ICM is working or not.
Same dwellmeter was used for checking and adjusting ignition points in an OLD cars distributor.
Quick check:
Remove dist cap, check for spark output directly from the coil tower.
How big of a lightning bolt can it produce?
Attach a ground wire to a screwdriver, hold it against the tip of the tower, have someone crank it and slowly pull the screwdriver away to see how much spark can be produced.
If it can throw a spark across a 3/4 inch gap, that's great. If it can barely spark a gap of 1mm, that coil is bad (but the system is trying to fire the coil so the rest of the dist is ok)
If zero spark is seen, then I get out the dwellmeter to see if the ICM is working or not.
If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
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From: Midwest. Aiming about mid-chest
Rep Power: 518 If you think a good mechanic is expensive, try hiring a bad one
Joined: Dec 2011
Posts: 32,017
Likes: 256
From: Midwest. Aiming about mid-chest
Rep Power: 518 Re: Replaced head gasket
The igniter controls the coil.
This is where I'd use the dwellmeter to see if the igniter is doing its job or not.
If dwell is present in any amount during cranking (I usually see 3-5 degrees during cranking) that means the igniter is ok and the coil is bad.
Coil is usually the first thing to fail.
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