Question about Cars & Trucks
A strong engine has new distributor cap and rotor plugs and wires about a year old. I have thought it could be a intake leak but only 1 cylinder don't seem right and want to check a few other options first I hope
Hello What is the year make and model? Also, have you scanned the system for fault codes? Misfires can be caused by a number of different things including anything as small as spark plug spacing to a failed ECU and I would be happy to run the codes if you can get them. Feel free to call if need be 561 615 0103 hope this is helpful! -Tim
Posted on Nov 24, 2014
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Posted on Jan 02, 2017
burned valve is likely the culprit.... or bad rings.... hook air up to that cyclinder one at a time.... and listen where the air is escaping... be aware that the motor will rotate till the piston is at the bottom of it's rotation. if it's a burned valve you will have to remove the head and replace it but somewhat easier job then replacing the rings. darn almost forgot.... it can also be a blown head gasket.... same procedure but you might need a brush and some soap water to test for an air leak at the side of the head. when you are done spray some wd 40 on it to get the water off so the spark plugs do not arc.
Posted on Sep 26, 2008
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
Posted on Dec 10, 2008
Aloha We have just replaced all of what you have replaced, plus water pump, fuel pump, pcv valve and 02 sensor. Took it to mechanic today we had misfire on 1,2,6,7. Mechanic said that the 99 dodge is known for bad computers, he checked ours and works great turns out that it was the coil. Ours was jumping 1/4 inch and had a orange/yellow spark. it is supposed to have a 1 inch spark and be blue. This has solved our problems after 527 dollars later.
Check the coil!
Posted on Feb 26, 2009
SOURCE: p0300 (random misfire) code
I would suspect your distributor is faulty. It isn't too hard to remove it and inspect for wear. Set the engine at TDC, then unbolt and remove distributor. Remove cap and check for bearings and/or metallic debris inside of distributor. If so, it is toast. Even if you don't see any metal particles inside, check that the distributor rotates freely by hand. If not, you will need to replace the distributor assembly soon.
Posted on Nov 15, 2010
Tips for a great answer:
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Oct 09, 2013 | Subaru Outback Cars & Trucks
Bad miss at idle?
While stop engine idles like cylinder missing?
Engine Misfire codes for car?
Engine Misfire codes?
Misfire on cylinder 4?
Oil on spark plugs and car misfires?
This will help.
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P0303....Cylinder 3 Misfire Detected
P0304....Cylinder 4 Misfire Detected
sounds like a new set of HT leads and plugs wouldnt go amiss(fire wires) weird name that fire wires HT stands for high tension leads in proper english .
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