P0305 CODE
From : ace1
Q: i have a 1999 dodge ram.the other night out of the blue it started to run rough and check engine light came on.checked it with scanner and it came up p0305 cylinder 5 misfire detected.any ideas of what this could be plugs and wires seem to be ok. .
Replies:
From : tbone
could be a plugged or dirty injector. -- if at first you dont succeed youre not cut out for skydiving i have a 1999 dodge ram.the other night out of the blue it started to run rough and check engine light came on.checked it with scanner and it came up p0305 cylinder 5 misfire detected.any ideas of what this could be plugs and wires seem to be ok. .
From : tom lawrence
up p0305 cylinder 5 misfire detected.any ideas of what this could be yep - its a misfiring cylinder sorry - had to state the obvious. could be due to lack of fuel clogged/non-functioning injector/damaged injector wiring/failed pcm lack of spark fouled plug bad wire bad distributor cap or lack of compression stuck/burnt valve blown head gasket cracked head - just to name a few possibilities. quick tests to eliminate problems are swap plugs and wires #5 to #7 on both ends - plug end and distributor end. clear the codes and run it again. if the misfire moves to #7 youve got either a bad wire or bad plug. next bleed the pressure from the fuel rail either through a test port or pull the fuel pump fuse and run the engine till it quite then unbolt and pull up the drivers side fuel rail and swap #5 and #3 #7s harder to work on injectors. put it back together and see if the misfire moves to #3. if so - bad injector. next thing would be to perform a compression test at least on #5 but id do the whole left bank so you have numbers to compare to - do the other 4 if youre ambitious. if compression is low 130lbs. or greater than a 10% difference compared to the other cylinders a leak-down test is in your future to determine where the compressions going. at that point you get into more serious engine work. of course - theres always the off-the-wall type of causes... a friends truck started running rough acting like it was down a cylinder. he was also hearing some valvetrain noise. after doing some basic tests we pulled the valvecovers not as easy on a v-10 - damn intake plenum and discovered a missing yep - mia pushrod with a rocker arm just flapping loosely back and forth doing not much of anything. pulling the lower intake manifold revealed the missing pushrod laying at the back of the lifter valley minding its own business and slightly bent. sometimes you just never know until you tear into things... .
From : Annonymous
tom is right literally could be anything and you could even get misleading successes. i chased a p0307 problem on a 97 ram 5.2l for over a year. with the help of this group we tried many things and several times thought we had it nailed until the problem came back a few days weeks or few months later. always on the same cylinder and progressively harder to keep it cleared for any length of time. one of my symptoms we discovered late in the diagnosing was that once we had the code cleared just by resetting it with a scan tool we could keep it cleared by never allowing the engine rpms to *ever* fall below 800 i.e. holding your foot lightly on the gas while at a traffic light. solving this could be as easy and cheap as rerouting & separating your plug wires to prevent cross-firing; it could be as hard and as expensive as a cracked cylinder head. cylinder misfire codes can sometimes be really tough to accurately diagnose because as we discovered there are so darn many variables that can cause it. we ended up finally going to a dealer where they did a full top end overhaul replacing both cylinder heads complete all new heads valves springs rockers plugs wires etc. i honestly cannot say with any degree of certainty that the dealer actually pinpointed the cause as much as they literally shotgunned the whole top end by replacing literally everything it could possibly be. only after teardown did it become evident that the #7 intake valve seat was cracked. hopefully yours wont be as difficult or as expensive to find. lawrence tnloaswpraemnmcien5g@earthlink.net writes up p0305 cylinder 5 misfire detected.any ideas of what this could be yep - its a misfiring cylinder sorry - had to state the obvious. could be due to lack of fuel clogged/non-functioning injector/damaged injector wiring/failed pcm lack of spark fouled plug bad wire bad distributor cap or lack of compression stuck/burnt valve blown head gasket cracked head - just to name a few possibilities. .
From : marsh monster
====== ====== ace1 wrote fixed the problem.plug wire was burnt.thanks for all the ideas. ======= ======= like i always tell folks.......... nevereverneverever................................ start diagnosing from where the last guy stopped or.....take his word for it that what he checked..... checked good. i refer you to yer original post g marshmonster takes a toke.....sips his crownroyal .
From : tom lawrence
with your luck you might want to pick up a lottery ticket. nah - his was actually pretty typical. with your luck id stay away from ladders black cats and anyone hoisting a safe or a piano up to a 10th floor apartment .
From : Annonymous
ace1 acombs4@verizon.net writes fixed the problem.plug wire was burnt.thanks for all the ideas. you *really* lucked out! my p0307 ended up costing over $2k after a year-plus of trying just about everything. just goes to show the wide range of things that can cause a cylinder misfire code. with your luck you might want to pick up a lottery ticket. .
From : Annonymous
lawrence tnloaswpraemnmcien5g@earthlink.net writes with your luck you might want to pick up a lottery ticket. nah - his was actually pretty typical. with your luck id stay away from ladders black cats and anyone hoisting a safe or a piano up to a 10th floor apartment understood. i had a similar costly experience a number of years ago with a chevy -after- putting in a brand new not rebuilt long block. worst mistake i ever made aside from buying the chevy in the first place. the initial 100k was uneventful but it sucked a valve at 105k. silly me rather than sell the bones for scrap i thought the pristine body and never-smoked-in interior was worth dropping a new mill in it. then the tranny went... then the rear end started howling. somebody ended up with a p.o.s. 69 camaro with a whole bunch of brand new parts in it. .
From : ace1
changed #5 plug ran good for about 4 miles then started running rough again. .
From : Annonymous
ace1 acombs4@verizon.net writes changed #5 plug ran good for about 4 miles then started running rough again. be sure to clear the code each time either with a scan tool or by pulling the battery cable for about 30 secs. .
From : ace1
fixed the problem.plug wire was burnt.thanks for all the ideas. .