11-25-2019, 04:22 PM
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#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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11-25-2019, 04:32 PM
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#2
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Quote:
Originally Posted by jminz
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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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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11-25-2019, 04:35 PM
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#3
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Quote:
Originally Posted by jminz
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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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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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread: https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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11-25-2019, 05:43 PM
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#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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11-25-2019, 09:36 PM
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#5
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All great info. Thanks guys
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2000 T4R SR5 Black-Sold
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2006 T4R Sport, V8, Shadow Mica. OME lift. JBA UCAs. Firestone bags. 265/70/17 BFG KO2. FN fx pro wheels.- Sold (mistake)
2007 Lexus GX470, Dobinson 2'', Firestone bags, TRD Pro wheels, General Grabber ATx
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11-25-2019, 11:27 PM
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#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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11-26-2019, 11:48 AM
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#7
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Quote:
Originally Posted by HiLife
The exhaust would produce a sweet smell if the head gasket has failed with antifreeze entering the combustion chamber .
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+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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11-29-2019, 12:10 AM
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#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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11-29-2019, 10:05 AM
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#9
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Quote:
Originally Posted by 2owner4runner
all 6 cylinders were good at 170ish but I guess I need to pull the heads
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That's a little low, but still good. Why do you think you need to pull the heads?
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11-29-2019, 11:05 AM
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#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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11-29-2019, 01:48 PM
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#11
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Quote:
Originally Posted by I_bRAD
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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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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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread: https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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11-29-2019, 01:52 PM
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#12
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Quote:
Originally Posted by 2owner4runner
all 6 cylinders were good at 170ish but I guess I need to pull the heads
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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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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread: https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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11-29-2019, 04:48 PM
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#13
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Quote:
Originally Posted by brillo_76
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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11-29-2019, 05:19 PM
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#14
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Quote:
Originally Posted by 3bears
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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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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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread: https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer: https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information: https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html
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