help with neon only hitting on 2 cylinders

5

Asked by May 15, 2011 at 09:57 AM about the 1995 Dodge Neon 4 Dr Sport Sedan

Question type: Maintenance & Repair

ok I just bought this neon they said a mechanic put a new timing belt on it it is only running
on cylinders 2&3 if you pull the plug wires off of 1&4 it doesn't change the way it runs at all it
is getting fire to 1&4 plugs already checked that  and is running very rough but after you get
it out on the road and it goes into 2 nd gear it smooths out and then back to rough in 4th  

11 Answers

475

check the timing i guess it skip

2 out of 2 people think this is helpful.
35

i have a 2004 dodge neon sxt 2.0 . replaced the camshaft posistion sensor and the o/2 sensor..no change. i then changed the spark plugs and wires.. a little better.. then i put a can of pressurized air conditioning compressor oil in the a/c system and no more jerking or running rough.. i hope this helps you or others searching for a fix brizz

3 out of 3 people think this is helpful.
6,275

sounds like either bent valves or burnt valves, injectors on cylinders 1 and 4 move to 2 and 3 see if the oposing cylinders change. Or the coil pack has a crack 1 and 4 run off the same pack and 2 and 3 run off the same pack it is a strong posibility its a coil pack issue.

3 out of 3 people think this is helpful.
925

this sounds every much like a coil pack issue that i once had. get some in line spark tester and check it that way. try asking someone on http://forums.neons.org/ they might have a better idea

2 out of 2 people think this is helpful.
6,275

why ask someone on neons.org when i am a certified chrysler tech and own 4 neons?

6 out of 6 people think this is helpful.
50

ok, 2004 sxt. 135,000 miles on it. i have replaced every sensor, all ignition components, fuel injectors, motor mounts(all 4), timing belt water pump and tensioner, fuel pump filter and pressure regulator, catalytic converter, o2 sensors, idle air control valve, air filter, intake gaskets. still have rough idle... still throwing p300 and 303. yes i changed the cam knock and crank sensors, rewired the battery to the starter and the ground to the transmission replaced clutch and speed sensor. you name it i have done it.... any suggestions?

4 out of 4 people think this is helpful.
1,575

I think the better question would be "Why did the mechanic put on a new timing belt? Was it due to be changed, or was it overdue and it broke?"

1 out of 1 people think this is helpful.
50

Matt... I changed it out at 80000 miles because i was doing motor mount... It did not break... But good question. Y did the dude that started this string have it changed...

1 out of 1 people think this is helpful.
1,575

If the belt was changed because it broke, it's probably why the engine isn't running right.

1 out of 1 people think this is helpful.
6,275

CHECK YOUR VALVES...PROBABLY A BURNED VALVE!!!!!!!!!!!!!!!!!!

1 out of 1 people think this is helpful.
75

if if was a burnt valve wouldnt it show up on a compression test? i mean why pull the head off if you dont have to? i just put a head on one we shipped out to the machine shop. rebult the whole motor.but the car seems to have a miss fire and a rough idle. but drives like a bat out of hell and doesnt break up when under a load. if i unplug the injector wire at idel no change, i can unplug both cylinder 1&2 injectors and see no change.... compession is fine, is getting spark, the injecotrs sray out fuel, the computer is sending signal, verified by noid light. so i have fire fuel and spark.... but still have a rough idle... replaced the pcm, the plugs, wires, injectors, comprsion test was good 175 all the way across its a rebuilt head with brand new valves and a brand new cam. new rings on the pistons etc.. all freshly rebuilt... what say you now? 00 neon 2.0 stock with a k7n airfilter manual trans....

5 out of 5 people think this is helpful.

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