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Toyota No 2 plug fouling, engine running rough like a miss fire. have changed plugs, leads, rotor, rotor cap. compression tested and all cylinders are between 130 to 150 psi. have checked timing and it appears ok. unsure of what to check next could it be rocker adjustment? as I used the timing light to check firing lead by lead and no 2 cylinder miss fires every now and then.engine miss fire, run on.

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  • 11 Answers

I think you have burnt valve seat or head gasket either cylinder head has to be removed

Posted on Nov 23, 2013

  • Jamie Harrison
    Jamie Harrison Nov 23, 2013

    souldn't a burnt seat or valve show on a compresion test, there are no bubbles in the cooling system or water in the oul either. when the timing light is put onto lead no2 it cuts in and out.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Check engine light comes on temporarily - engine chuggs at idle

Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

Posted on Mar 12, 2009

  • 100 Answers

SOURCE: miss fire on # 3 cylinder after complete engin overhall

check your firing sequence.

Posted on Jun 21, 2009

luv2tango
  • 36 Answers

SOURCE: 90 corvette with 22,000 miles running very rough and back firing

Well it sounds like you've started to do your "due diligence", but there are several things left out. Your problem could be many things. Something as minor as a vacuum hose left off, loose, or in the wrong place. And just because you changed the plugs and wires, don't mean you fixed your problem. Open your hood at night and see if you have any sparks "dancing" around. Another way to check this is to open your hood and spray a soapy water solution on your plug wires and look for sparks jumping around. If so replace your wires. You didn't mention what type of wires and plugs you used. I would reccommend NKG platnum plugs and a Bosch wire. I know this from experience,(the hard way teacher). It could even be the gas you are burning. I've owned a lot of Vettes, and I am the kind of guy who believes they should be driven. If not it's like having a beatiful wife and never taking her to bed.I know a lot of people who only drive them "once in awhile". Sitting in thier garage can cause many fuel problems, condensation, sludge in the carb, or filters etc. This can all lead to the problem you are describing.
Low speed miss- usually plugs
High speed miss- usually wires or valves
intermitten miss, fuel or electrical.
I hope I gave you some places to look to find your problem.


Posted on Jul 07, 2009

  • 79 Answers

SOURCE: rough idle

Barring any mechanical issues you most likely have a failed injector.

Posted on Aug 14, 2009

mikehitchner
  • 28 Answers

SOURCE: No compression in #5 cylinder V6 SOHC?

Sounds like a blown head gasket,bad valves or bad rings.If this is the only cylinder affected then the head gasket is more than likely the problem.

Posted on Jan 01, 2010

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3 Answers

Engine running rough why?


did you replace the plugs leads one at a time
and not mix up the firing order

is this plug lead layout the same as your engine ?


if the car was running rough before

could be fuel related
or a burnt valve = uneven cylinder compression



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Apr 29, 2017 | Cars & Trucks

1 Answer

Miss fire #6 cyl 2000 dodge 3500 van 5.9 egine


100 PSI is way to low, I think you have a burnt valve. Check the cylinder compression on all cylinders, no cylinder should be 5% lower than the highest cylinder pressure measured or the engine will run rough or misfire.

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1990 geo storm sohc is running rough. Parts that are new: cap, rotor, plugs wires,plugs, pickup coil, and the ignition module looks brand new. The coil is old, but is still sending spark through all t


the timing is 180 degrees out so ignore where no 1 lead should be and rewire the HT leads to the new position for no1 cylinder. The crank timing mark should be on 10 degrees advanced. Engines are timed off the crank position so forget the cam position.
Or you can start again. Remove no 1 plug and turn the engine over until you feel compression under your finger over the plug hole. Set the timing on the crank to 10 degrees before tdc. Position the distributor so that the point of the star is directly opposite the exciter coil in the distributor. The rotor button should now be facing no 1 cylinder plug lead adjust the HT leads so that they will fire in the 1342 firing order. Start the engine and with a timing light attached to no 1 plug lead adjust the timing mark to specifications by turning the body of the distributor.

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2tg wont run properly and help would be very much apreciated -i am by no means a mechanic-


Didn't say if you pulled the sparkplugs on 2 and 3. Are the plugs good and not oil fouled? Also, possible they got a crack in their porcelain when putting the engine in. Do a compression test and see if all cylinders have good compression, especially 2 and 3. Check the distributor cap and rotor for wear. Just throwing out a few suggestions, Jack. (Sure wish I had your webers.) Good luck. Do let us know the outcome.

Jun 27, 2012 | Toyota Celica Cars & Trucks

1 Answer

Engine run rough and miss 3 cylinder


maybe a bad plug switch plugs from 3 to to 2 see does it affect 2

Mar 23, 2010 | 1989 Chevrolet S-10 Blazer

1 Answer

Running rough, spark plugs, distributor cap, rotor


First thing you need to know is which cylinders are missing. Then, don't forget there is an engine beneath the electronics. Do a quick test with a vacuum gauge and do a compression test. Check the distributor shaft for side play. If everything checks out good, then do electronic component testing. have a code check run (many parts stores do this free) and get a chiltons or haynes manual and follow test procedures in there.
I refrain from giving repair suggestions with problems like yours because people keep changing instead of testing parts. When I work on my vehicles or other peoples cars, I do testing to avoid buying expensive parts that most times won't correct the problem. At this point the most I'd suggest is to clean the mass air flow sensor wires with a Q-tip and carb cleaner...that often helps and is free. If you run into a problem with whatever you find, ask and I'll try to help.
good luck

Oct 05, 2009 | 1996 Chevrolet Suburban

3 Answers

No spark number 6 cylinder v-8


does not fire where? at the plug? have u checked the wire, cap..hmmm..77 ..how many miles on that motor? have u done a compression check? could be burned valve, fouled plug bad wire worn cap and or rotor ..check the obvious first. start at the plug..if it's not firing, swap it for a known good one.. if it doesn't fire, swap the wire, if it still doesn't fire swap cap and rotor..if that doesn't solve or identify where the bad component is.or if you find you have fire at the plug but still misses on the cylinder.... start looking inside.. run compression check... if it's low squirt oil in cylindeer and check again.. if it comes up drastically.. it's worn rings..but if it stays low probably worn valves. but i'm thinking its somewhere between the distributer and the plug.. good luck...

May 19, 2009 | 1988 Jaguar XJ6

1 Answer

Check engine light comes on temporarily - engine chuggs at idle


Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

Mar 12, 2009 | 1999 Jeep Cherokee 4WD

1 Answer

Fuel injectors or Distributor Cap?


the blinking CEL light is an indication of a miss-fire, run the code retrival test to find out what cylinder is the one missing, at your miles it could be almost anything from a low compression issue to a bad distributor cap, a fuel injector could be the problem, run the test and get back to me, Kragen and other chain parts stores will test the system for codes for FREE!

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