User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-09-2020, 02:37 AM #1
Crackership's Avatar
Crackership Crackership is offline
Junior Member
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Crackership Crackership is offline
Junior Member
Crackership's Avatar
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Missfire Cyl#2

Hi all,

I recently purchased a 1996 Limited with 260k on the clock. I got it for a steal with a P0302 CEL for missfire cylinder #2. I've read every thread I can find that might help, but I've still got the missfire. I'm hoping someone can point me to something I've overlooked.

Here's what I've done so far:

- checked all the vacuum lines, some don't look great but no apparent leaks
- cleaned the MAF
- replaced the spark plugs (yes, got the correct 2-prong guys)
- replaced spark plugs wires
- replaced the coil for 5 and 2
- cleaned the throttle body and IAC
- Bench tested the IAC and it checks out
- replaced injectors

The only things left that I can think of are compression test and then check the timing. Any other ideas?

TIA!
Crackership is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 07:15 AM #2
LittleCaesar's Avatar
LittleCaesar LittleCaesar is offline
Elite Member
 
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,779
LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough
LittleCaesar LittleCaesar is offline
Elite Member
LittleCaesar's Avatar
 
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,779
LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough
Perform a compression or leak down test to get an idea of the physical health of the engine. The latter would be better.

Any coolant loss?

O2 sensors look original?

Check all the grounds as well.....
LittleCaesar is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 07:57 AM #3
thegipper's Avatar
thegipper thegipper is offline
Senior Member
 
Join Date: Mar 2016
Location: West Bend, WI
Posts: 2,266
Real Name: Mike
thegipper has a spectacular aura about thegipper has a spectacular aura about thegipper has a spectacular aura about
thegipper thegipper is offline
Senior Member
thegipper's Avatar
 
Join Date: Mar 2016
Location: West Bend, WI
Posts: 2,266
Real Name: Mike
thegipper has a spectacular aura about thegipper has a spectacular aura about thegipper has a spectacular aura about
Quote:
Originally Posted by LittleCaesar View Post
Perform a compression or leak down test to get an idea of the physical health of the engine. The latter would be better.

Any coolant loss?

O2 sensors look original?

Check all the grounds as well.....
Leak down test is needed, it's the gold standard on checking the engine for major issues.
__________________
1997 SR5 4x4 Auto, 99' tall coils up front, OME 906's, Truetrac LSD, Airaid MIT
1999 SR5 4x4 Auto for parts
2011 Camry SE V6
2011 Highlander Limited
thegipper is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 11:57 AM #4
Crackership's Avatar
Crackership Crackership is offline
Junior Member
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Crackership Crackership is offline
Junior Member
Crackership's Avatar
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Quote:
Originally Posted by LittleCaesar View Post
Perform a compression or leak down test to get an idea of the physical health of the engine. The latter would be better.

Any coolant loss?

O2 sensors look original?

Check all the grounds as well.....
I'll do a compression test today.

No coolant loss at all.

The O2 sensors look original or, at least, very old. But I would think more of a general fueling issue would present with a bad O2, rather than a single cylinder miss. Is there something I'm missing there?

I've been checking every ground I find, is there a diagram of their locations that you're aware of?

Thanks!
Crackership is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 12:40 PM #5
spartacus's Avatar
spartacus spartacus is offline
Senior Member
 
Join Date: Mar 2010
Location: denver
Posts: 1,993
spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold
spartacus spartacus is offline
Senior Member
spartacus's Avatar
 
Join Date: Mar 2010
Location: denver
Posts: 1,993
spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold spartacus is a splendid one to behold
Quote:
Originally Posted by Crackership View Post
I'll do a compression test today.

No coolant loss at all.

The O2 sensors look original or, at least, very old. But I would think more of a general fueling issue would present with a bad O2, rather than a single cylinder miss. Is there something I'm missing there?

I've been checking every ground I find, is there a diagram of their locations that you're aware of?

Thanks!
Ground point diagram
Attached Images
Missfire Cyl#2-screenshot_2020-06-09-10-34-55-1-jpg 
spartacus is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 01:20 PM #6
Crackership's Avatar
Crackership Crackership is offline
Junior Member
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Crackership Crackership is offline
Junior Member
Crackership's Avatar
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Quote:
Originally Posted by spartacus View Post
Ground point diagram
Thank you!
Crackership is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 01:34 PM #7
LittleCaesar's Avatar
LittleCaesar LittleCaesar is offline
Elite Member
 
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,779
LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough
LittleCaesar LittleCaesar is offline
Elite Member
LittleCaesar's Avatar
 
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,779
LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough
Quote:
Originally Posted by Crackership View Post
I'll do a compression test today.

No coolant loss at all.

The O2 sensors look original or, at least, very old. But I would think more of a general fueling issue would present with a bad O2, rather than a single cylinder miss. Is there something I'm missing there?

I've been checking every ground I find, is there a diagram of their locations that you're aware of?

Thanks!
Usually that is the case with 02 sensors, though in a blue moon I have seen a lazy one cause such, though it is usually mated with a PO300.

Post up your numbers when finished. As @thegipper alluded to, a leak down test takes away all guesswork.
LittleCaesar is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 02:02 PM #8
Crackership's Avatar
Crackership Crackership is offline
Junior Member
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Crackership Crackership is offline
Junior Member
Crackership's Avatar
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Quote:
Originally Posted by LittleCaesar View Post
Usually that is the case with 02 sensors, though in a blue moon I have seen a lazy one cause such, though it is usually mated with a PO300.

Post up your numbers when finished. As @thegipper alluded to, a leak down test takes away all guesswork.
I'll do a compression test today. I don't have a leakdown tester, but I'll see if I can cobble something together with the hose form the compression tester. Is there a way to get the timing covers off enough to verify TDC without removing the upper radiator hose? I'm guessing not, but I can hope.
Crackership is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 02:32 PM #9
Bad Luck Bad Luck is offline
Senior Member
 
Join Date: Feb 2019
Location: Hot Springs, AR
Posts: 1,886
Real Name: Patrick
Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold
Bad Luck Bad Luck is offline
Senior Member
 
Join Date: Feb 2019
Location: Hot Springs, AR
Posts: 1,886
Real Name: Patrick
Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold
I'm not sure if your year has it, but you may see if you have an igniter module. When I was dealing with my 4Runner misfire I diagnosed that module some to verify operation. Something to consider.

I'd also ohm out all your coil packs on the primary and secondary circuits.
__________________
2000 Limited V6 Auto E-Locker
Bad Luck is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 03:54 PM #10
JohnMc JohnMc is offline
Member
 
Join Date: Jul 2011
Location: St. Louis
Posts: 704
JohnMc will become famous soon enough JohnMc will become famous soon enough
JohnMc JohnMc is offline
Member
 
Join Date: Jul 2011
Location: St. Louis
Posts: 704
JohnMc will become famous soon enough JohnMc will become famous soon enough
Is it noticeably running on 5 cylinders? Only at idle or accelerating/higher PRM's as well?

It takes a fair amount of compression leak to show up as a miss. SO much so that usually a 'shade' tree compression test can spot it.

Pull the wires on all three coils, then crank the motor around for a short bit. So you don't flood the motor with gas, just do it a few times round and round. And listen as the start labors over each compression. Whir, whir, whir, whir... LIsten for any spot int he cranking where it sort of sails on by a compression without slowing down (as much).

Easy, quick to do, no tools needed, and if you hear uneven cranking, then yes, you've got big problems and will need to do more diagnostic work. Leakdown tests are great because they tell you where the compression is going. Out the PCV system - bad piston/rings, maybe a HG. Out the cooling system, probably a bad HG. Out the intake or exhaust, something wrong with a valve.
__________________
'99 Highlander 5-spd manual e-locker no-running-board
gray wire/1" body lift/32" tires/'Snowflake' TRD Taco wheels/231mm Tundra brakes/Rola rack
JohnMc is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 04:40 PM #11
Crackership's Avatar
Crackership Crackership is offline
Junior Member
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Crackership Crackership is offline
Junior Member
Crackership's Avatar
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Quote:
Originally Posted by JohnMc View Post
Is it noticeably running on 5 cylinders? Only at idle or accelerating/higher PRM's as well?

It takes a fair amount of compression leak to show up as a miss. SO much so that usually a 'shade' tree compression test can spot it.

Pull the wires on all three coils, then crank the motor around for a short bit. So you don't flood the motor with gas, just do it a few times round and round. And listen as the start labors over each compression. Whir, whir, whir, whir... LIsten for any spot int he cranking where it sort of sails on by a compression without slowing down (as much).

Easy, quick to do, no tools needed, and if you hear uneven cranking, then yes, you've got big problems and will need to do more diagnostic work. Leakdown tests are great because they tell you where the compression is going. Out the PCV system - bad piston/rings, maybe a HG. Out the cooling system, probably a bad HG. Out the intake or exhaust, something wrong with a valve.
It is noticeably running rough. It's fairly smooth when cold, but gets progressively rougher as it warms up.

I pulled the plug quickly during lunch in preparation for a compression test this evening and noticed that the plug is black with fuel. So I did a quick spark test and have spark.. I'm not sure what to make of this..
Crackership is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 04:43 PM #12
Crackership's Avatar
Crackership Crackership is offline
Junior Member
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Crackership Crackership is offline
Junior Member
Crackership's Avatar
 
Join Date: Jun 2013
Location: Duvall, WA
Posts: 15
Real Name: Dave
Crackership is on a distinguished road
Quote:
Originally Posted by Bad Luck View Post
I'm not sure if your year has it, but you may see if you have an igniter module. When I was dealing with my 4Runner misfire I diagnosed that module some to verify operation. Something to consider.

I'd also ohm out all your coil packs on the primary and secondary circuits.
Was this on a 3rd Gen 4Runner? I did a quick Google search and didn't find an igniter for the 3rd Gen, but maybe I'm just missing it?
Crackership is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 05:01 PM #13
plcfcng's Avatar
plcfcng plcfcng is offline
Member
 
Join Date: Apr 2017
Location: Southern California (please don't hold it against me)
Posts: 419
Real Name: michael
plcfcng will become famous soon enough plcfcng will become famous soon enough
plcfcng plcfcng is offline
Member
plcfcng's Avatar
 
Join Date: Apr 2017
Location: Southern California (please don't hold it against me)
Posts: 419
Real Name: michael
plcfcng will become famous soon enough plcfcng will become famous soon enough
What did the plug look like when you pulled it out ? If it looked different it can tell you alot. You can Start the engine remove radiator cap let the engine come up to temperature at idle when the engine is at operating temp look down the radiator neck see if there are any bubbles.
plcfcng is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 05:01 PM #14
Bad Luck Bad Luck is offline
Senior Member
 
Join Date: Feb 2019
Location: Hot Springs, AR
Posts: 1,886
Real Name: Patrick
Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold
Bad Luck Bad Luck is offline
Senior Member
 
Join Date: Feb 2019
Location: Hot Springs, AR
Posts: 1,886
Real Name: Patrick
Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold Bad Luck is a splendid one to behold
Quote:
Originally Posted by Crackership View Post
Was this on a 3rd Gen 4Runner? I did a quick Google search and didn't find an igniter for the 3rd Gen, but maybe I'm just missing it?
Igniter Failure?
The dtc is P1300, but I didn't have any codes with a dead miss somehow so I did the diagnostics for P1300 as wells as everything for P0300. Ended up being one of my coil packs. The secondary side was about 100 ohms higher than the other 2 coil packs, but was still well within the specifications listed in the factory service manual.
__________________
2000 Limited V6 Auto E-Locker
Bad Luck is offline   Reply With QuoteReply With Quote
Old 06-09-2020, 05:16 PM #15
LittleCaesar's Avatar
LittleCaesar LittleCaesar is offline
Elite Member
 
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,779
LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough
LittleCaesar LittleCaesar is offline
Elite Member
LittleCaesar's Avatar
 
Join Date: May 2011
Location: OBX, NC and Obamaville
Posts: 6,779
LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough LittleCaesar is a jewel in the rough
Quote:
Originally Posted by Crackership View Post
It is noticeably running rough. It's fairly smooth when cold, but gets progressively rougher as it warms up.

I pulled the plug quickly during lunch in preparation for a compression test this evening and noticed that the plug is black with fuel. So I did a quick spark test and have spark.. I'm not sure what to make of this..
Well then either it isnít firing (ignition) or the injector is bad, even though you said you replaced them? OEM replacement?

Got a helper to crank over the engine as you test for spark?
LittleCaesar is offline   Reply With QuoteReply With Quote
Reply

Tags
cleaned , missfire , plugs , replaced , spark

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Missfire cyl 5 and 2 Jackthewack 3rd gen T4Rs 36 12-30-2017 12:47 PM
96 4Runner missfire issue mmankins 3rd gen T4Rs 7 11-22-2013 06:36 AM
cylinder # 1 missfire gremlin curt4x4 3rd gen T4Rs 10 01-30-2013 12:57 PM
Missfire when cold alan_2011 3rd gen T4Rs 4 08-01-2011 11:34 PM
missfire fhornerguy 3rd gen T4Rs 5 08-19-2006 06:06 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 02:10 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2020