Mike "Wuzzy121". Rest in peace, brother

Go Back   Tacoma World Forums > Tacoma Garage > 4 Cylinder

Notices

Rough Idle After Driving-2.7L

Reply
 
Thread Tools Search this Thread
Old 05-08-2012, 06:13 AM   #1
chuckh [OP] chuckh is offline
Junior Member
chuckh is on a distinguished road
Name: Charles
Joined: May 2012, #78412
Location: NC
Gender: Male
Posts: 5
chuckh's Tacoma Gallery
Rough Idle After Driving-2.7L

I am having a rough idle issue with a 1995 Tacoma 2.7L.

The engine has 200K on the bottom end and about 50K on a head gasket/head job.

I first noticed the rough idle after coming off the interstate and coming to a stop and it would usually clear itself up after shutting the engine off. This would only happen only occasionally at first.

Now I can short the battery terminals and restart which will get rid of the problem until I run it back down the road. A few minutes of driving will cause the issue. I can run it forever idling and sitting in the driveway with no issues and once it starts I can turn the engine off and come back the next day and still have the issue until I short the cables.

I have replace the plugs, and cleaned the MAF and throttle body. There are no CEL codes.

Unplugging the MAF after it starts runing rough only improves the idle slightly so I do not think it is the MAF.

Catalytic converter and o2 sensors have about 50K on them.

Has anyone ever experienced this? Any Ideas?

Thank you in advance for any info.
  Reply With Quote
Old 05-08-2012, 05:15 PM   #2
Member
LDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shedLDurchy is one of the sharper tools in the shed
 
LDurchy's Avatar
Joined: Apr 2012, #77643
Location: Cedar Falls, Iowa
Gender: Male
Posts: 90
LDurchy's Tacoma Gallery
I have a 1993 4cyl. Last time I encounted a bit of a vibration at idle I was due in for adjustment of the pushrods. My understanding is that my engine has solid lifters. When I idle rough again I will schedule it again.
  Reply With Quote
Old 05-08-2012, 08:23 PM   #3
chuckh [OP] chuckh is offline
Junior Member
chuckh is on a distinguished road
Name: Charles
Joined: May 2012, #78412
Location: NC
Gender: Male
Posts: 5
chuckh's Tacoma Gallery
fixed it

I think I found my problem. There was a vaccum leak on the side of the throttle plates that does not have vaccum until the throttle is opened. I guess the small amount of unmetered air that would come in while driving was affecting long term fuel trim to the point where it would not idle. Each time I reset the ECM it would clear the long term trim and it would run fine until the ECM tried to adjust and the long term fuel trim would get back out of whack. The earlier incidences of rough idle following interstate driving could have been unrelated.

Thanks,
Charles
  Reply With Quote
Old 05-09-2012, 06:03 AM   #4
chuckh [OP] chuckh is offline
Junior Member
chuckh is on a distinguished road
Name: Charles
Joined: May 2012, #78412
Location: NC
Gender: Male
Posts: 5
chuckh's Tacoma Gallery
not fixed

That wasn't it.

It ran great for a longer period of time but that was not it. Also I am noticing that shorting the cables could have been coincidental as well because today after driving I was not able to get it to run better after shorting the cables. When it is idling rough it it accelerates as if it is loading up but it still has plenty of power. The last time that it ran this way it was the head gasket.

I guess compression tests and leakdown tests will be next. It passed compression tests before with a bad head gasket but the leakdown bubbled the overflow reservoir.

Anyone have any other suggestions?

Thanks,
Charles
  Reply With Quote
Old 05-10-2012, 08:31 AM   #5
chuckh [OP] chuckh is offline
Junior Member
chuckh is on a distinguished road
Name: Charles
Joined: May 2012, #78412
Location: NC
Gender: Male
Posts: 5
chuckh's Tacoma Gallery
Update

So I figured out that the rough running/rough idle only occurs after having my foot into it which points to something that is failing under stress. I dropped in another distributor last night that I had laying around and drove it like I stole it for 30 miles to work this morning with no issues. I am keeping my fingers crossed.
  Reply With Quote
Old 05-11-2012, 05:48 AM   #6
Junior Member
Soozin is on a distinguished road
Joined: May 2012, #78005
Location: Wisconsin
Gender: Female
Posts: 4
Soozin's Tacoma Gallery
Keep the post going..i have this with my 96. Just had u tuneup done too..no fuel filter change tho..mayb should have. Shouldnt they have said something bout my distributor?
  Reply With Quote
Old 05-11-2012, 09:03 AM   #7
Senior Member
skytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shed
 
skytower's Avatar
Navy: Gunners Mate
Name: Dave
Joined: Jun 2010, #38505
Location: virginia
Gender: Male
Posts: 3,185
skytower's Tacoma Gallery
Definetly replace the fuel filter. An engine straining to pull fuel through a dirty filter will cause that problem.
Replace all of your vac lines, hunting for leaks is a waste of time on an engine that old.
Is that engine coil on plug, or coil pack? In the dark, mist the coils and wires(coil pack) with water and look for arcs. If coil on plug, did you replace the insulator boots? They will arc out, and you won't see it.
Remove the air induction hoses, stick a flashlight inside the hose(in the dark) flex the hose and look for leaks.
  Reply With Quote
Old 05-21-2012, 11:39 AM   #8
chuckh [OP] chuckh is offline
Junior Member
chuckh is on a distinguished road
Name: Charles
Joined: May 2012, #78412
Location: NC
Gender: Male
Posts: 5
chuckh's Tacoma Gallery
Soozin,

Are you still having issues with your Tacoma? If yours does have a distributor and you are experiencing the same issues as I was then I would not suggest spending the money on a distributor without having someone troubleshoot a little more. I happened to already have a whole distributor from a previous engine swap. The ignition coil is in the distributor along with a pick-up coil which appears to be a cam sensor. My guess is that the sensor inside the distributor was bad becasue I would expect misfire codes if the ignition coil was bad.

Charles
  Reply With Quote
Old 05-29-2012, 07:14 PM   #9
ASE Master Tech
BamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shedBamaToy1997 is one of the sharper tools in the shed
 
BamaToy1997's Avatar
Marines: M1A2 hull/turret technician, 4th Maint Btn. 4th FSSG.
Name: Bill
Joined: Jan 2012, #71846
Location: Marion, AL
Age: 46
Gender: Male
Posts: 8,051
BamaToy1997's Tacoma Gallery
Quote:
Originally Posted by skytower View Post
Definetly replace the fuel filter. An engine straining to pull fuel through a dirty filter will cause that problem.
Replace all of your vac lines, hunting for leaks is a waste of time on an engine that old.
Is that engine coil on plug, or coil pack? In the dark, mist the coils and wires(coil pack) with water and look for arcs. If coil on plug, did you replace the insulator boots? They will arc out, and you won't see it.
Remove the air induction hoses, stick a flashlight inside the hose(in the dark) flex the hose and look for leaks.
I believe his is neither type of ignition system you mentioned. He mentioned that he installed a replacement distributor to test. I agree with you that a fuel filter would be a good idea to consider. especially if it has not been changed for a while.
  Reply With Quote
Old 05-29-2012, 09:24 PM   #10
Senior Member
skytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shedskytower is one of the sharper tools in the shed
 
skytower's Avatar
Navy: Gunners Mate
Name: Dave
Joined: Jun 2010, #38505
Location: virginia
Gender: Male
Posts: 3,185
skytower's Tacoma Gallery
Missed that. Plugs,wires, cap, rotor, vac lines=smoooth. Fuel filter is normally a stall issue, but cheap insurance.
  Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rough Idle? BOLLINGERTACO Technical Chat 9 03-02-2012 09:59 AM
Rough idle? USNavyTaco 2nd Gen. Tacomas 11 04-14-2011 10:24 PM
rough idle viperfella 1st Gen. Tacomas 12 05-31-2010 07:32 PM
Rough Idle, Help!! 95toyotaco 1st Gen. Tacomas 13 01-24-2010 04:58 AM
help with rough idle apex9r 1st Gen. Tacomas 13 11-15-2009 01:21 PM


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