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Can an alternator cause a cylinder to mis fire?
LoP Guest
lop guest
User ID: 423816
10-12-2018 03:56 AM

 



Post: #46
RE: Can an alternator cause a cylinder to mis fire?
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The Ghost Of LOP  Wrote: (10-12-2018 02:22 AM)
I think I got a bad alternator...

But also my #2 Cylinder is misfiring...

Can the issues be related to the Alternator ?

Some cars have the voltage regulator in the ECU for the engine, jeep Cherokee from the late 90s and some others I think.
If you had a bad diode the alternator might drain the battery when not running.
Use a volt meter and check the battery voltage running, and not.
12 volts not running, 13.8 or so running.
Check battery terminals, check grounds.
If low voltage and misfire on one plug, if you have coil on plug ignition then a coil is getting weak or bad connection on coil. If distributor or coil pack style then it is unrelated or the plug gap is too wide on one cylinder.
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LoP Guest
lop guest
User ID: 467475
10-12-2018 04:00 AM

 



Post: #47
RE: Can an alternator cause a cylinder to mis fire?
The Ghost Of LOP  Wrote: (10-12-2018 02:26 AM)
silversides  Wrote: (10-12-2018 02:24 AM)
Distributer cap, wires, spark plugs...

I just had the plugs / wires replaced last year.

Get two bottles of Redline SL1 and dump one bottle into two consecutive tanks of fuel. Do a mixture of highway and short trip driving.
That will clean a clogged injector without ultrasound or replacing it.
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Hrd2Stbd
Banned
User ID: 462768
10-12-2018 04:00 AM

Posts: 3,252



Post: #48
RE: Can an alternator cause a cylinder to mis fire?
There's about 2 people in here who know what they are talking about. The rest is just noise.

You have an electrical problem. We all know you can't fix it yourself, so take it to a mechanic. Did your car get water logged in the flooding? Fix that, then address the ignition issue.
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LoP Guest
lop guest
User ID: 467475
10-12-2018 04:03 AM

 



Post: #49
RE: Can an alternator cause a cylinder to mis fire?
LoP Guest  Wrote: (10-12-2018 04:00 AM)
The Ghost Of LOP  Wrote: (10-12-2018 02:26 AM)
I just had the plugs / wires replaced last year.

Get two bottles of Redline SL1 and dump one bottle into two consecutive tanks of fuel. Do a mixture of highway and short trip driving.
That will clean a clogged injector without ultrasound or replacing it.

If you smell raw fuel at idle, it would be leaking injector flooding the cylinder with more fuel than can burn, also leading to a missing cylinder symptom.

Don't waste money on anything other than the Redline. Techron is the only other thing worth its salt, but not as concentrated as the SL1
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LoP Guest
lop guest
User ID: 423633
10-12-2018 04:22 AM

 



Post: #50
RE: Can an alternator cause a cylinder to mis fire?
LoP Guest  Wrote: (10-12-2018 04:00 AM)
The Ghost Of LOP  Wrote: (10-12-2018 02:26 AM)
I just had the plugs / wires replaced last year.

Get two bottles of Redline SL1 and dump one bottle into two consecutive tanks of fuel. Do a mixture of highway and short trip driving.
That will clean a clogged injector without ultrasound or replacing it.

No
Check plug, coil/wire first. Usually first things before clogged injector.

What year/make/model?
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beans
lop guest
User ID: 397554
10-12-2018 04:39 AM

 



Post: #51
RE: Can an alternator cause a cylinder to mis fire?
Use seafoam.. serious...

I know a master mechanic and saw this done...

[Image: osndZfI.jpg]

Then he revved the engine to the limit... chuckle

If it is a clogged thing , that will work well... New engine lol...

If you got a leaky gasket or such , you may have a mess...

See , how being able to diagnose your own car problems is a plus...chuckle
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LunaC
¯\_(ツ)_/¯
User ID: 441651
10-12-2018 04:40 AM

Posts: 6,044



Post: #52
RE: Can an alternator cause a cylinder to mis fire?
beans  Wrote: (10-12-2018 04:39 AM)
Use seafoam.. serious...

I know a master mechanic and saw this done...

[Image: osndZfI.jpg]

Then he revved the engine to the limit... chuckle

If it is a clogged thing , that will work well... New engine lol...

If you got a leaky gasket or such , you may have a mess...

See , how being able to diagnose your own car problems is a plus...chuckle

I vouch for that.

Fléctere Si Néqueo Súperos Acheronta Movebo
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LoP Guest
lop guest
User ID: 467479
10-12-2018 05:15 AM

 



Post: #53
RE: Can an alternator cause a cylinder to mis fire?
You have a bad Earth/Ground . It will either be the the Earth strap from the engine to the battery or the Earth strap from the engine to the body/chassis .

A bad/loose Earth will cause your lights to be dull and cause ECU faults that will bring the CEL on . It will also reduce the amount of power going to the fuel pump and also to the injectors and coils. Any one of these will cause your misfire .
The battery obviously has some charge in it as it still starts the engine and you didn't mention needing a jump start at any time .
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beans
lop guest
User ID: 397554
10-12-2018 05:19 AM

 



Post: #54
RE: Can an alternator cause a cylinder to mis fire?
LunaC  Wrote: (10-12-2018 04:40 AM)
beans  Wrote: (10-12-2018 04:39 AM)

I vouch for that.

:thumbup
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LoP Guest
lop guest
User ID: 452464
10-12-2018 05:25 AM

 



Post: #55
RE: Can an alternator cause a cylinder to mis fire?
The Ghost Of LOP  Wrote: (10-12-2018 02:30 AM)
LoP Guest  Wrote: (10-12-2018 02:27 AM)
The timing belt may need adjusting. When the timing belt goes your engine will be rekt.

I don't know, The reason I thinking it's the Alternator is
My lights are really dim of a night to the point it looks like it not even on at times and when it rains. Also my left turn signal in the dash is doing strange things and fluctuating speed when my break is pressed and headlights are on. When I roll up my windows the lights flicker and also when i hit the breaks.


I think I may have a bad diode or something with the alternator....

You have a bad connection from the negative battery post to the frame of the car...somewhere, good luck finding it.

In most vehicles the negative cable goes from the Battery (-) to the engine block , and then to the frame and body of the vehicle.

One of these is loose, broken or missing.

the easiest way to check it is to take a voltmeter put one lead in the negative post on the battery and the other to the frame of the car ( while it is running ) and see if you have a voltage difference ( it should be near zero ).

Another way is to turn the headlights on , hook your jumper cable up to the Negative battery post and clamp the other end to the frame , if the headlights get brighter you need to start checking all the negative cables.
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LunaC
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User ID: 441651
10-12-2018 05:29 AM

Posts: 6,044



Post: #56
RE: Can an alternator cause a cylinder to mis fire?
LoP Guest  Wrote: (10-12-2018 05:15 AM)
You have a bad Earth/Ground . It will either be the the Earth strap from the engine to the battery or the Earth strap from the engine to the body/chassis .

A bad/loose Earth will cause your lights to be dull and cause ECU faults that will bring the CEL on . It will also reduce the amount of power going to the fuel pump and also to the injectors and coils. Any one of these will cause your misfire .
The battery obviously has some charge in it as it still starts the engine and you didn't mention needing a jump start at any time .

LoP Guest  Wrote: (10-12-2018 05:25 AM)
You have a bad connection from the negative battery post to the frame of the car...somewhere, good luck finding it.

In most vehicles the negative cable goes from the Battery (-) to the engine block , and then to the frame and body of the vehicle.

One of these is loose, broken or missing.

the easiest way to check it is to take a voltmeter put one lead in the negative post on the battery and the other to the frame of the car ( while it is running ) and see if you have a voltage difference ( it should be near zero ).

Another way is to turn the headlights on , hook your jumper cable up to the Negative battery post and clamp the other end to the frame , if the headlights get brighter you need to start checking all the negative cables.

With everything ghost has said I think this is the best think I've heard yet.

Fléctere Si Néqueo Súperos Acheronta Movebo
(This post was last modified: 10-12-2018 05:30 AM by LunaC.) Quote this message in a reply
LoP Guest
lop guest
User ID: 467481
10-12-2018 05:29 AM

 



Post: #57
RE: Can an alternator cause a cylinder to mis fire?
2am Breathe  Wrote: (10-12-2018 02:33 AM)
The Ghost Of LOP  Wrote: (10-12-2018 02:28 AM)
Never heard of them....

click the link chuckle they are sooo funny. listen to a few podcasts.

Click and Clack may have a podcast specifically about your problem.

They both went to MIT and owned a garage and are expert mechanics.

One is dead now and the other is retired, last I heard, but their material is timeless!

They have great laughs and are quick to laugh.
I loved when they would have callers try and imitate the noise their car was making.

And their law firm Dewey, Cheatham, and Howe.
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beans
lop guest
User ID: 397554
10-12-2018 05:33 AM

 



Post: #58
RE: Can an alternator cause a cylinder to mis fire?
With all this positive encouragement and help...

What do you think the odds are of Ghost solving this problem... chuckle
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LunaC
¯\_(ツ)_/¯
User ID: 441651
10-12-2018 05:36 AM

Posts: 6,044



Post: #59
RE: Can an alternator cause a cylinder to mis fire?
beans  Wrote: (10-12-2018 05:33 AM)
With all this positive encouragement and help...

What do you think the odds are of Ghost solving this problem... chuckle

If you factor in gofundme they become workable.
Anon

Fléctere Si Néqueo Súperos Acheronta Movebo
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beans
lop guest
User ID: 397554
10-12-2018 05:37 AM

 



Post: #60
RE: Can an alternator cause a cylinder to mis fire?
LunaC  Wrote: (10-12-2018 05:36 AM)
beans  Wrote: (10-12-2018 05:33 AM)
With all this positive encouragement and help...

What do you think the odds are of Ghost solving this problem... chuckle

If you factor in gofundme they become workable.
Anon
chuckle
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