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Misfire Nightmare

 
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  #1 (permalink)  
Old 12-07-2015, 05:53 PM
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Misfire Nightmare

My mechanic and I are stunned and running out of options.
Misfire started after motor swap, everything around motor is the same as before with no misifre.

Cylinder 1-2-3 most of the time, sometimes 4th also.
Misfire tends to appear minutes after start, when cold. Runs alright tho, some little hesitations but not much.
When warm, runs like new...

What is done/checked so far:

-Spark plugs
-Wires
-Distributor, cap, rotor
-EGR valve
-EGR ports cleaned
-Fuel injectors
-Fuel pump
-IACV
-Coolant bleeded
-Engine coolant temperature sensor
-Dry compression test (180 all around)
-Vacuum leaks

Thanks for helping, what to get rid of that headache.
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Old 12-08-2015, 08:09 AM
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Re: Misfire Nightmare

Try tapping (not banging) on the iacv while it's cold. See if that changes your idle speed.
Also unplug it to see if your idle speed changes.

How's your coil looking?
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Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 12-08-2015, 02:00 PM
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Re: Misfire Nightmare

Thank u you for your answer.

IACV is good, we tried 3 (yes 3...) in the process and misfire still occurs.
Idle is fine all around, cold or warm.

Coil is new, forgot to put in the list.
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Old 12-08-2015, 07:19 PM
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Re: Misfire Nightmare

I had a horrible misfire, turned out to b the upstream o2 sensor, maybe check that out
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Old 12-08-2015, 07:54 PM
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Re: Misfire Nightmare

Both o2 sensors are new and fine.
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Old 12-09-2015, 01:47 PM
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Re: Misfire Nightmare

Misfire and rough only at idle now, even when warm.

Can't find the damn thing!
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Old 12-09-2015, 01:56 PM
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Re: Misfire Nightmare

Have you got a service manual?

Try opening the adjuster of your throttle body to see if that helps it run better.

What that does is allow a bit more vacuum break.

If that helps the service manual and a vacuum gauge can help you hunt down where the vacuum is building up too much.

Could be as simple as a clogged/non working pcv. Or it could be your idle/air bypass system is gummed up...or possibly valves not open/close properly...or...
The vacuum gauge tells all.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 12-09-2015, 02:32 PM
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Re: Misfire Nightmare

Fast idle thermal valve?? Check everything's at tdc, put your finger over the 2 holes (one at a time) at the inside of the throttle body while it's running
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Old 12-11-2015, 01:48 AM
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Re: Misfire Nightmare

Added a ground on the head near alternator.
Changed ingnition coil.
Changed pcv valve.
Did idle valve check.
Redid compression test.

Still..........

Next step, adjust valves, check for rounded cam lobes and change crank sensor.

Last edited by Acetriple999; 12-11-2015 at 01:54 AM.
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Old 12-13-2015, 02:49 PM
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Re: Misfire Nightmare

I had this problem. Try the valve adjustmentioned. Mine were all out of spec but no more random misfire when cold afterwards.
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Old 12-30-2015, 03:02 AM
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Re: Misfire Nightmare

Turn out it was valve adjustment.

Thank you for your help.
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Old 12-30-2015, 10:00 AM
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Re: Misfire Nightmare

Right on!!

Did you diy or have a mechanic do it?
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 01-05-2016, 04:41 AM
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Re: Misfire Nightmare

Good to hear you finally figured it out!
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