Mike "Wuzzy121". Rest in peace, brother

Go Back   Tacoma World Forums > Tacoma Discussion > 1st Gen. Tacomas

Notices

Bad engine misfire?

Reply
 
Thread Tools Search this Thread
Old 04-14-2013, 07:20 PM   #1
Junior Member
tweak240s14 is on a distinguished road
Name: Jerome
Joined: Apr 2013, #102092
Location: Jasper Al
Gender: Male
Posts: 4
tweak240s14's Tacoma Gallery
Bad engine misfire?

Hey ya'll. Im a newbie on this forum. I have a bad engine miss on my 99 prerunner. Here's a little background....
99 PreRunner 2.7L
319,000 mi. ( 125k on engine)
AUTOMATIC
replaced radiator (20k ago)
CEL : coded p0420 for 10k miles or so.
New wireset, new denso plugs, new twin coil packs, new fuel filter

Recently started experiencing a bad miss. Pulled a p0301 misfire code. Changed the plugs, wires, fuel filter and "seafoamed" the intake via the brake booster vacuum.
No change.
Did compression test today. Numbers all over the plce. Not exactly sure if i did it right.... pulled efi fuse and relay then turned the engine over for 7 seconds. Then recorded my #'s one at a time after 6 seconds crank on each cylinder test.
#1 - 99
#2- 120
#3- 109
#4- 114

Used jumper cables to keep battery hot...
Do i need to crank it for a longer period if time for each cylinder? Or could it really be that bad?
I use BG44K fuel treatment monthly.
i am open to any and all help.
Thank you all!
  Reply With Quote
Old 04-14-2013, 11:35 PM   #2
4WD 4WD is offline
cRaZy oLdmAn
4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed
 
4WD's Avatar
Name: Doug
Joined: Jul 2009, #19185
Location: Lakeside,CA
Age: 56
Gender: Male
Posts: 20,942
4WD's Tacoma Gallery
Quote:
Originally Posted by tweak240s14 View Post
Hey ya'll. Im a newbie on this forum. I have a bad engine miss on my 99 prerunner. Here's a little background....
99 PreRunner 2.7L
319,000 mi. ( 125k on engine)
AUTOMATIC
replaced radiator (20k ago)
CEL : coded p0420 for 10k miles or so.
New wireset, new denso plugs, new twin coil packs, new fuel filter

Recently started experiencing a bad miss. Pulled a p0301 misfire code. Changed the plugs, wires, fuel filter and "seafoamed" the intake via the brake booster vacuum.
No change.
Did compression test today. Numbers all over the plce. Not exactly sure if i did it right.... pulled efi fuse and relay then turned the engine over for 7 seconds. Then recorded my #'s one at a time after 6 seconds crank on each cylinder test.
#1 - 99
#2- 120
#3- 109
#4- 114

Used jumper cables to keep battery hot...
Do i need to crank it for a longer period if time for each cylinder? Or could it really be that bad?
I use BG44K fuel treatment monthly.
i am open to any and all help.
Thank you all!
Welcome to TW , did you pull all the plugs first ? & actually your numbers are within specs for the most part..
  Reply With Quote
Old 04-15-2013, 05:30 AM   #3
Junior Member
tweak240s14 is on a distinguished road
Name: Jerome
Joined: Apr 2013, #102092
Location: Jasper Al
Gender: Male
Posts: 4
tweak240s14's Tacoma Gallery
Thx Doug. Yes, i did remove all plugs at one time, then I began the compression test.
Could it be an issue that is symptomatic from the EGR code? I still havent corrected that yet. Forgot To mention I replaced the o2 sensors about 4,000 miles ago.
Any other suggestions?
  Reply With Quote
Old 04-15-2013, 03:43 PM   #4
Senior Member
tan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shed
 
tan4x4's Avatar
Name: Rick
Joined: Nov 2011, #67982
Location: Folsom, CA
Age: 59
Gender: Male
Posts: 1,398
tan4x4's Tacoma Gallery
P0420 means "Catalyst System Efficiency Below Threshold (Bank 1)"
Did you mis-type? P0402 relates to the EGR system.
  Reply With Quote
Old 04-15-2013, 04:56 PM   #5
Junior Member
tweak240s14 is on a distinguished road
Name: Jerome
Joined: Apr 2013, #102092
Location: Jasper Al
Gender: Male
Posts: 4
tweak240s14's Tacoma Gallery
Yes sir. My bad p0402.... mis type. I was trying to narrow down cleaning the egr..... the vacuum switch replaced.... or the temp sensor? Too many variables to decide... hate to just throw $ at it. Ive never seen the specs on the conpression test i did... do u happen to agree with Doug? I am clueless.clueless
  Reply With Quote
Old 04-15-2013, 07:43 PM   #6
Junior Member
tweak240s14 is on a distinguished road
Name: Jerome
Joined: Apr 2013, #102092
Location: Jasper Al
Gender: Male
Posts: 4
tweak240s14's Tacoma Gallery
Its is entirely possibly a typo..... ill have to check it again in the a.m. thanks for noticing Rick. Any other suggestions are greatly appreciated!
  Reply With Quote
Old 04-15-2013, 09:45 PM   #7
4WD 4WD is offline
cRaZy oLdmAn
4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed4WD is one of the sharper tools in the shed
 
4WD's Avatar
Name: Doug
Joined: Jul 2009, #19185
Location: Lakeside,CA
Age: 56
Gender: Male
Posts: 20,942
4WD's Tacoma Gallery
Quote:
Originally Posted by tweak240s14 View Post
Yes sir. My bad p0402.... mis type. I was trying to narrow down cleaning the egr..... the vacuum switch replaced.... or the temp sensor? Too many variables to decide... hate to just throw $ at it. Ive never seen the specs on the conpression test i did... do u happen to agree with Doug? I am clueless.clueless
No one ever agrees with me..... I say your numbers are within specs for combustion, if you take your lowest (99) & if the highest (120) that makes a 20lb +/- difference which may be a tad wide but you'd still have enough to fire pretty normally, but I notice that the highest & lowest are next to one another cylinder wise, something could be suspect.. How's the CAT ? Any unusual odors coming from exhaust ? Bad CAT doesn't always throw a code I'm told..just throwing it out there
  Reply With Quote
Old 04-16-2013, 08:07 AM   #8
Senior Member
tan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shed
 
tan4x4's Avatar
Name: Rick
Joined: Nov 2011, #67982
Location: Folsom, CA
Age: 59
Gender: Male
Posts: 1,398
tan4x4's Tacoma Gallery
Quote:
Originally Posted by tweak240s14 View Post
Yes sir. My bad p0402.... mis type. I was trying to narrow down cleaning the egr..... the vacuum switch replaced.... or the temp sensor? Too many variables to decide... hate to just throw $ at it.
P0402 - "Exhaust Gas Recirculation Flow Excessive Detected"

This sounds like there is too much exhaust being recycled.
2 possible culprits come to mind:
- the main EGR valve stuck partially open (which should also cause a bad idle)
- bad EGR modulator

The valve can be removed and cleaned (via soaking in a solvent ?)
The modulator can be VERY EASILY swapped out with a known good one for a test. I'd go to a nearby pick-n-pull for the modulator.
  Reply With Quote
Old 04-16-2013, 08:17 AM   #9
Senior Member
tan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shedtan4x4 is one of the sharper tools in the shed
 
tan4x4's Avatar
Name: Rick
Joined: Nov 2011, #67982
Location: Folsom, CA
Age: 59
Gender: Male
Posts: 1,398
tan4x4's Tacoma Gallery
Quote:
Originally Posted by tweak240s14 View Post
Ive never seen the specs on the conpression test i did... do u happen to agree with Doug? I am clueless.
Yes, I agree with him. The compression is a bit low on all cylinders, but pretty consistent (therefore has less power, more blowby, but shouldn't cause a mis-fire). However, I'm not a real expert in this area. Doug likely has more experience in rebuilding than I do (I've only done one).
  Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Truck is running really bad... Misfire... 99GreenYota 1st Gen. Tacomas 33 01-17-2014 07:50 PM
Cylinder misfire 2 and 3 random misfire. Meangene Technical Chat 4 12-12-2012 04:58 PM
Engine Code P0304 - Cylinder 4 Misfire harshest 2nd Gen. Tacomas 2 10-21-2012 02:58 PM
Diagnose this! (check engine light on, misfire) Singlecab Technical Chat 7 05-24-2012 04:40 AM
misfire in engine 3.4 liter V6 2002 ak90799763 Technical Chat 0 03-17-2010 01:22 PM


Copyright © 2014 Tacoma Forum. Tacoma World is not owned by, or affiliated with Toyota Motor Corporation.