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Engine is misfiring why?

Tiny
BIGBADSPOON
  • MEMBER
  • 9 POSTS
I finally had a chance to sit down with the car and here are some values I measured for sensors on the ECU through the attachment you gave me as well as the coil.

The engine is the d16y8, so I used the 3rd diagram for the pins.
8 and 9: 521 ohms
20 and 21: 204.4 ohms
29 and 30: 299.4 ohms

coil pimary: 1 ohm
coil secondary: 20680 ohms
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
The ignition coil readings are out of specs. For secondary readings, it is neither here nor there whereas for primary it is completely out of range.
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
BIGBADSPOON
  • MEMBER
  • 9 POSTS
Well, those specs are at 68 degrees, and I have to drive over to someone else's house to test, which raises resistance. The temp was prob around 200 degrees, at that point. I will try to let the engine cool down more next time I'm over there for a more accurate test.

I'm not convinced those readings are off far enough on a hot engine to be the cause.

Were the distributor sensors in spec?
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Specification for those sensor resistance are 350 - 700 ohms.

The lower 2 are out of specs.
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
BIGBADSPOON
  • MEMBER
  • 9 POSTS
Are both of those sensors located in the distributor?
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Yes they are.
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
LINDAVH
  • MEMBER
  • 2 POSTS
  • 1999 HONDA CIVIC
Engine Performance problem
1999 Honda Civic 4 cyl 175, 00 miles

My 99 Honda Civic starting chugging at stops. I took it in and they gave me an estimate of $600 for parts and $100 for labor for a new distributor. They also recommended a $100 fuel service. Is this normal pricing? How long can I wait before getting this replaced and serviced?
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi LindaVH,

Thank you for the donation.

Pricing differs region to region so it is best to ask around for the prices. Get a second opinion if necessary.

Why does the distributor requires replacing? When the distributor goes bad, the engine would fail to start. If it is the ignition coil, it can be replaced as a componet and not necessary to treplace the complete distributor.

Depending on the problem, it could be the spark plugs, wires, distributor cap and /or rotors and how lont it can lat would depend on the condition of the fault.

Is the Check Engine Ligh t indicating and have you tried to retrieve for trouble codes?
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
BIGBADSPOON
  • MEMBER
  • 9 POSTS
Bought a new distributor, but before install traded coils just for fun and the misfire persisted. When I replaced the distributor, problem solved!

Thank you so much for helping me narrow that down. I have invested way too much time diagnosing this problem.
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
LINDAVH
  • MEMBER
  • 2 POSTS
They said my cylinders are misfiring and that's why my engine acts up at stops. They told me the spark plugs and wires are ok except that one spark plug can't be removed to be looked at. My maintenance light didn't come on, but there were messages retrieved saying Misfire codes: P0300, P0303 and P0304.

I will try to get another estimate then. I'm based in Austin, TX.

Thanks!
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Glad to know you have fixed the problem.

Have a nice day.
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+1
Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Misfiring codes are seldom due to the distributor.

P303 and P304 indicates misfirng in cylinder 3 and 4 repecively and if it is a fault with the distributor, most likely all four trouble codes should show. I would suggest getting a second opinion as well.

If there is a sprak plug that is stuck, then you should try to get it out. Any bad spark plugs could cause the problem.

You are recommended to replace the distributor and service the fuel, I have an inkling the guy is going by a do-this-and-hope-it-works way. I would be looking for a new mechanic as this shop does not seem up to the mark for the job.
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
TRINIFLY12
  • MEMBER
  • 1 POST
  • 1999 HONDA CIVIC
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 89,628 MILES
While im driving I could feel the car jerking. Like is pulls back like if u are on a roller coaster. But its keeps moving and I feel it jerking all the time. What do u think is the problem. Do u think the car will just stall after a while
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Monday, January 4th, 2021 AT 12:44 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Sometimes engine misfires are mistaken for trans problems. Is or has the check engine light been on? If so have it scanned for codes, this will help figure it out. Start basic first though, have you ever tuned it up? If so did you use OEM parts?
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Monday, January 4th, 2021 AT 12:44 PM (Merged)

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