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I have a misfire issue with my car it runs but poorly i have pics of the spark plugs after running the vehicle for a few mins. I’m trying to figure out if it an ignition problem or a mechanical problem. The first 2 plugs look fine but the other 2 that look dark 1 and 4 cylinder are he plugs that look fine but 2 and 3 cylinders look to be the problem any suggestions that I could try thanks.
Also the plug that looks bent I dropped it by accident I gap it back
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Does the car smoke, use oil, or coolant?
If it does any of the above–when cold or hot?
Next question. What in the He&& are we talking about LOL!!!
Some cars and trucks have issues that are known to act up. Knowing what we are working on can help out with the diagnoses of the issue(s)
S-
It’s a 1990 Mitsubishi galant and it smokes when cold at the muffler a little bit not much it smokes at the front on from the exhaust manifold but I think it’s for needing a valve cover gasket
I’ve actually seen worse.
It’s typical though. All that carbon build up. I’d personally dip just that end part in carb cleaner to soften it up. I would not introduce the upper section into it. That stuff tends to eat rubber and might do more harm then good.
S-
That engine will run the same EGR plugged or not but one of your spark plugs has no gap. As for the smoke at startup – valve seals.
The thing is I got the head done a few months ago seals replaced head milled installed everything correctly and won’t run correctly
I had 96 Galant with same EGR condition. Easy fix.
Your SP #3 is out of gap and #4 and #3 are fouled with what looks like carbon build up. As they also look wet, I am leaning towards unburnt petrol.
You need to regap #3.
As of smoking issue, 2 areas:
1. 100% valve cover seals
2. Valve stem seals.
I had my engine completely torn apart, I learned a thing or 2 about them. Good cars.the valve seals have been replaced I know i should replace the valve cover gasket what causes the carbon buldup on he 2 and 3 plugs but the other 2 are fine and this is a good car just got this problem with it
This a waste spark engine that fires 1 & 4 and 2 & 3 together. Well, it looks like the one plug is grounded out. That would affect both cylinders.
Also the plug that looks bent I dropped it by accident I gap it back
It’s part of the first post by this member. He dropped that plug and re-set the gap.
S-
You can’t say it’s 100% anything unless you diagnose it. No one should say it’s 100% this or that, period. Now that being said, you need to go through the diagnosing process.
1. Do you know 100% these are the cyl. that are missing? Are the plugs “fouled” from fuel because they’re missing or because of a leaking injector? Is it missing because of the plug? These are things you have to ask yourself, which is why I never say 100% anything, we must go on facts.
2. Do you have spark? From the coils? No? Do you have signal coming from the PCM to the coils or is it just a bad coil? If you move cyl. 1 coil too cyl. 2 does the misfire travel with it? Same for plugs, same for wires.
3. Do you have fuel? If you do is it the correct pressure? Does it bleed off immediately after the car is turned off? Is pressure low because of a pump? Clogged fuel filter?
4. Do you have injector pulse? If you do have pulse are the solenoids inside the injectors clicking open and close?
5. Are there any vacuum leaks?
6. Is there a loss of coolant? Sister Cyl. missing with coolant loss and white smoke. In some cases can mean a head issue.
7. Do you have compression? If not, leak down test. Where are we losing compression too? Is it because of a mechanical problem or is it the motor out of time?
These are the things we have to ask ourselves and find out, nothing can be assumed.
[quote=”ShopTech” post=112411]You can’t say it’s 100% anything unless you diagnose it. No one should say it’s 100% this or that, period. Now that being said, you need to go through the diagnosing process.
1. Do you know 100% these are the cyl. that are missing? Are the plugs “fouled” from fuel because they’re missing or because of a leaking injector? Is it missing because of the plug? These are things you have to ask yourself, which is why I never say 100% anything, we must go on facts.
2. Do you have spark? From the coils? No? Do you have signal coming from the PCM to the coils or is it just a bad coil? If you move cyl. 1 coil too cyl. 2 does the misfire travel with it? Same for plugs, same for wires.
3. Do you have fuel? If you do is it the correct pressure? Does it bleed off immediately after the car is turned off? Is pressure low because of a pump? Clogged fuel filter?
4. Do you have injector pulse? If you do have pulse are the solenoids inside the injectors clicking open and close?
5. Are there any vacuum leaks?
6. Is there a loss of coolant? Sister Cyl. missing with coolant loss and white smoke. In some cases can mean a head issue.
7. Do you have compression? If not, leak down test. Where are we losing compression too? Is it because of a mechanical problem or is it the motor out of time?
These are the things we have to ask ourselves and find out, nothing can be assumed.[/quote]
Too much shop think here. So, in your mind, limit yourself to a small box of basic tools. Now, tell the owner how to fix his or her vehicle.
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