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Old 11-25-2019, 04:22 PM #1
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Head gasket vs bad coil/wires

Going to potentially look at a 97 weds. It has a misfire, cyl 3. Guy says it just needs new wires. How am I to know it only needs wires vs needing a new head gasket just by looking at it?
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Old 11-25-2019, 04:32 PM #2
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Quote:
Originally Posted by jminz View Post
Going to potentially look at a 97 weds. It has a misfire, cyl 3. Guy says it just needs new wires. How am I to know it only needs wires vs needing a new head gasket just by looking at it?
Look for oil frothing under oil fill cap. Look for low coolant, dirty coolant, etc. If the misfire goes away after warming up this could indicate HG leak.

100% way to find out? Bring a boroscope with you and look in 3rd cylinder.
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Old 11-25-2019, 04:35 PM #3
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Quote:
Originally Posted by jminz View Post
Going to potentially look at a 97 weds. It has a misfire, cyl 3. Guy says it just needs new wires. How am I to know it only needs wires vs needing a new head gasket just by looking at it?
White smoke when you fire it up and run it for a while. Antifreeze level. Oil level and smell.

Unless you do a compression check and antifreeze leakdown tests, it's sometimes hard to verify if head gasket leaking.


Engine would have to goto full operating temperature as well.


If at night and dark you can mist the wires and look for any arching.

Why not just fix the wires, coils if that causing the misfire.

Maybe an injector plugged too causing misfire or even a bad spark plug.

It could be a pile of things causing a misfire and just looking at it makes it kinda hard to find the exact cause.

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Old 11-25-2019, 05:43 PM #4
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I use a combustion leak tester to check out used cars. I've heard it isn't always the most reliable test but its quick and easy to use. Look for common HG symptoms others have mentioned but the leak tester I linked is nice to have & they're pretty cheap. I've seen cheaper leak testers in the $30-$40 range.

Combustion leak tester:
https://www.amazon.com/UView-560000-...s%2C146&sr=8-7
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Old 11-25-2019, 09:36 PM #5
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All great info. Thanks guys
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Old 11-25-2019, 11:27 PM #6
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The exhaust would produce a sweet smell if the head gasket has failed with antifreeze entering the combustion chamber .
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Old 11-26-2019, 11:48 AM #7
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Quote:
Originally Posted by HiLife View Post
The exhaust would produce a sweet smell if the head gasket has failed with antifreeze entering the combustion chamber .
+1 for this. also ask him to not run the car for a while before you check it out so you can hear a cold start. it'll produce more white smoke on the start if the vehicle has sat and more coolant has had a chance to drip and collect in the cylinder.
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Old 11-29-2019, 12:10 AM #8
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I am starting to think my head gaskets are toast

all 6 cylinders were good at 170ish but I guess I need to pull the heads
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Old 11-29-2019, 10:05 AM #9
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Quote:
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all 6 cylinders were good at 170ish but I guess I need to pull the heads
That's a little low, but still good. Why do you think you need to pull the heads?
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Old 11-29-2019, 11:05 AM #10
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I think generally speaking, any time you hear the statement "It just needs" you can go right ahead and assume the end of that is "a whole bunch of work"

If it just needed wires, I wonder why he didn't spend 30 bucks and a few minutes to get it running tip top. Surely it would be worth more that way.
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Old 11-29-2019, 01:48 PM #11
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Quote:
Originally Posted by I_bRAD View Post
I think generally speaking, any time you hear the statement "It just needs" you can go right ahead and assume the end of that is "a whole bunch of work"



If it just needed wires, I wonder why he didn't spend 30 bucks and a few minutes to get it running tip top. Surely it would be worth more that way.
Valid point. That phrase "It just needs" tells you it needs some serious


Yes like mine, Just needed some Frame work...LOL.




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Old 11-29-2019, 01:52 PM #12
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Quote:
Originally Posted by 2owner4runner View Post
all 6 cylinders were good at 170ish but I guess I need to pull the heads
Even or close to even is always very good for even lower compression.

As like Bad Luck why do you think you have to pull the heads??

You don't have a dead cylinder?? Is it because the compression is at 170??

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Old 11-29-2019, 04:48 PM #13
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Quote:
Originally Posted by brillo_76 View Post
Even or close to even is always very good for even lower compression.

As like Bad Luck why do you think you have to pull the heads??

You don't have a dead cylinder?? Is it because the compression is at 170??

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yep , if they are all about the same...even if low but equal..I would just suspect tired rings...but I sure would not start pulling stuff apart unless I had other issues
other issues like one dead or lots lower hole....fluid loss or cross contamination...a miss you cant fix otherwise with other fixes
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Old 11-29-2019, 05:19 PM #14
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yep , if they are all about the same...even if low but equal..I would just suspect tired rings...but I sure would not start pulling stuff apart unless I had other issues

other issues like one dead or lots lower hole....fluid loss or cross contamination...a miss you cant fix otherwise with other fixes
Sometimes we dont have a choice. I 100% agree but if I have a choice of leaving an engine be or tear it apart. I will leave it be for as long as I can. However, this is me. Others can do as they wish it's their rigs. ;)

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