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My truck is mis-idling

Installed spark plugs

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If this is a 2011 avalanche need to hook a scanner up to it may not be the spark plugs bad but the coil packets if maybe bAd

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

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Idles smooth, sputters coming from muffler like its running on one cylinder


Hi T:
Interesting as smooth idle and sputter are contra-indications.
- Smooth idle should be healthy
- Sputter could indicate problem:
- mis-fire? Possible bad spark plug or bad exhaust valve. Pull spark plugs to check to see if any are fouled. Compression check will help depermine why fouling is happening.
How many cylinders?
How many Km on engine?
With engine hot, Remove oil filler cap and see if any vapour indicating blow by (bad rings)
My suggestion?
Do some more checking and reply as a comment on this post. Will assist if I can.
Cheers.

Oct 18, 2015 | Cars & Trucks

1 Answer

Ugh


you have a mis get a complete tune up its worth a try even if it dont work atleast u.know ur maintnance is goo

Jul 30, 2013 | 1998 Ford Expedition

1 Answer

Mis when idling runs crapy plz help


Well you can pay to have it put on a scope OR start replacing parts.I would start with a tune-up Thats//// spark plugs/spark plug wires/distributor cap/ and rotor if applicable.Make sure the plugs have the right gap. They can tell you at the part store

Jun 09, 2011 | 1997 Chevrolet Tahoe

1 Answer

Hello, I just replace the spark plugs on my 2005 Cadillac CTS. After everything was installed and I powered up the car it began to idle very high. I double checked my work and couldn't figure out what...


High rpms could be caused by an intake leak or vacume leak check your vacume lines maybe in the process of replacing your plugs you might have accidently damaged a vacume line.

Jan 11, 2011 | Cadillac CTS Cars & Trucks

1 Answer

I changed my front 3 spark plugs and a broken wire now and i have very bad rough idle and i could hear clicks? whats going on? should I put the old ones back on? the new ones were bought from...


The spark plugs should be matched up with the old ones to be sure that are the same as the new spark plugs and that the threads are not too long or too short and if the spark plugs were pre-gapped or if they need to be gapped, and the auto part store should have given you that information along with any spark plug gap because some spark plugs you can not set the gap on or they will be damaged. The spark plug gap should also be printed on the emission label out under the hood. Also, the other three spark plugs and wires should be changed to complete the ignition tune-up.

The spark plug gap should be the same amount between all of the spark plugs, and the farther apart that the gap is between the spark plugs the rougher the engine will run and idle, and the closer that you get to the same spark plug gap between the spark plugs the smoother the engine will run and idle.

It is also very important that the spark plugs be connected to the correct terminals on the coil pack or the engine will have a severe mis-fire and it will set a mis-fire DTC (Data Trouble Code) and cause the check engine light to come on.

Here is a firing order diagram to help assist you and let me know if need help with this diagram or if you require any further assistance.




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Sep 21, 2010 | Hyundai Sonata Cars & Trucks

1 Answer

I have ford explorer sport 4.0l mis fires @3000 rpm changed spark plugs wires idles under a grand is it plugged injectors??


intake manifold gasket leaks are a problem.spray carb cleaner around the intake and if the rpm jumps when sprayed,the gasket leaks

Jan 29, 2010 | 2003 Ford Explorer Sport

2 Answers

Where are the spark plugs located?


i would suggest that you change all of the plugs. if i remember correctly cyl # 3 is the middle one in the front.if not its the middle one in the back (sorry its been a while since ive worked on a maxima)

Nov 22, 2009 | 1997 Nissan Maxima

1 Answer

No check engine light on runs rough while in gear


Plug Mis-firing (firing-but not adequately) no light and no fire.
Causes: Spark plug bad, spark plug wire leaking.
If you can pull the spark plugs - and you find that one of them is wet or very dirty - compared to the others....the you have the wire/plug source identified.

Oct 14, 2009 | 2002 Ford Taurus

1 Answer

My 1992 chevy s-10 blazer, starts, but dies out when in gear.


Sounds like it could be a mis-fire. At an idle, remove a plug wire to see if it stalls. If it does, re-install it and go to the next one. If you remove one and get no change, that cylinder is the problem. Test for spark.

Oct 06, 2009 | 1992 Chevrolet S-10

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