Question about 1998 Chevrolet S-10 Pickup

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Computer says irratic misfire. cylanders 1'3'5 plugs are carboned up after about 5 miles 1

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  • Marvin
    Marvin May 11, 2010

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  • 6 Answers

I had that problem. Changed the spark plug wires and the cap and rotor.

Posted on Aug 01, 2009

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PO306 cylinder 6 misfire I've already changed the plug/wires/coil pack/fuel injectors/crankshaft/throttle body sensors/and no vacuum leak what else could be the problem?


Sounds like there could be carbon on the valve and not allowing the valve to go shut after firing. There is treatment you can buy to clear the carbon.Then reset the computer and drive the car/ truck approx. 50 miles and see if the misfire returns. Hope this helps.

Mar 15, 2018 | Ford Cars & Trucks

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05 kia Sorrento #5 misfired already replace spark plug coil & injector same code still comes up #5 misfired can someone help me with this problem


you replaced the plug and injector but there is no mention of the HT lead or distributor cap being replaced or checked
It is possible that there is a crack or carbon track inside the cap which is also misfire for that cylinder. HT leads are carbon filled tracks with a wire insert at each end and if that wire fails to make contact with the carbon ( incorrect method of pulling from plug or cap) then the resistance in that lead makes the spark late which results in a misfire report.

Jul 26, 2015 | Kia Cars & Trucks

2 Answers

2001 cherokee # 5 misfire..switched spart plug with another cylander still # 5 changed coil and injector didnt fix problem..HELP


Did you put a "noid" light on the injector connector to ensure it's getting the pulse to open? Do you know that you are getting spark at the plug? The HV could be leaking out of the cable or connector(s). Finally, if all that's good you may need to do a compression test.

Jan 03, 2015 | 2001 Jeep Cherokee

1 Answer

I have a misfire on my toyota camry 2002 v6 3.0 on cylinder number 1 3 5.


Did you check compession it looks like you have low compression and posisibly fuel injector problem or just do a complete valve job if you see any white smoke

May 13, 2014 | Toyota Camry Cars & Trucks

1 Answer

Cylinder 1 is misfiring. The plugs and wires have been replaced.


Misfire condition can cause by few items.

1) mis-gap / worn / damaged plug.
One Hyundia and small displacement engine,it can also be loose plug.

2) oil leak / vapor covering the cermaic portion of the plug.

3) clogged air flter. // change interval for small car is 12,000 to 18,000 miles.

4) clogged PCV on // 140,000 or higher mile vehicle

5) worn valve cyclinder // 160,000 miles +

6) worn timing belt with an old water pump //// 140,000 miles+


Please reply with the currrent odomenter reading and recent repair record.

Feb 03, 2011 | Hyundai Motor 2004 Accent

1 Answer

I have an upper (or lower, not sure) valve train problem. Cylinder #5 misfires almost all the time, and engine makes chirping sounds when running. What's wrong and how do I fix it?


The first thing to check is the spark plug. Pull out the #5 (or all plugs) and check the color on the isulator. It should be golden brown. If the color is black, the cylinder is running rich and this could be a valve or timing issue. If the color is light, the injector pintle may be dirty or there may not be spark in that clyinder. Test for spark and if there is none, it may be the plug, wire or the coil. Replace the plugs if they look worn or if there are lots of miles on them. Replace the wires if they also have lots of miles on them and show signs of wear. To clean the injectors I recommend the Lucas gas treatment. This will clean and lube the fuel and valve train. It will also help remove any carbon build-up in the pistons and carbon can cause misfires. If there are trouble codes, have them pulled to see what the computer is reading for errors. If you use Shell gas, stop using it. This gas is proven to be harmful to GM but Esso and Chevron are the ones to use.
As for the chirping, it is either the exhaust system or a motor mount making the noise.

Jul 06, 2009 | 2001 Pontiac Firebird

3 Answers

Cylinder #1 misfire


#1 cylinder is the first one on the front of the engine on the drivers side. the reason for your misfire is most likely either a bad plug, bad plug wire, the coil pack or all of the above

May 20, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

MAP sensor / does a 2006 f150 have one? and if it


Bad MAP sensor....located on your intake manifold....one connector...1 o-ring

Mar 04, 2009 | 2006 Ford F-150

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