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21119 2120 running on one cylinder

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I have a 1999 VW Beetle and it's not running on all 4 cylinders. It's only running on 3 cylinders.


Probably runs better on three cylinders than most american made cars do on four! LOL.

Is that cylinder getting spark? Is the injector working? Plug fouled?

Sep 21, 2015 | Cars & Trucks

1 Answer

Started sputtering back fireing I think its only running on one cylinder.coil or fuel pump ? I changed plugs no change.please help.


Try swapping over the coils. You will need to completely swap over, not just the HT leads. There should be 2 electrical wires that push onto contacts for each coil, swap these to the other coil along with the plug leads. If it doesn't change anything (i.e. still runs on the SAME one cylinder) then there is nothing wrong with the coils. If, however it runs on the other cylinder, then the coil feeding the non-running cylinder is faulty.
Won't be the fuel pump as it is feeding the running cylinder and there isn't a separate pump for each cylinder. However, fuel may not be getting to the non-runner and that is most likely carb related IF you have more than one carb. I have 4 but some multi cylinder bikes may only have a single carb.

Aug 29, 2015 | Motorcycles

1 Answer

One cylinder running only


check the cam lobes,valve springs, the valves them selves especialy the inlet, without looking if its a push rod or chain, but check the cam shaft mechanism ie chain

Jul 17, 2013 | Harley Davidson FLHT Electra Glide...

1 Answer

1200 sportster not running on back cylinder


Verify the cylinder is not firing by measuring the temperature on the exhaust right out of the cylinder. If it is not firing the tempature will be much cooler than the front cylinder. Once you have determined the rear cylinder is not firing then you need to perform a compression test on the rear cylinder. If it is not with in specifications, you may have broken rings, burned valves or hole in piston. Until you run compression test you will not know which way to go.

Apr 05, 2013 | Harley Davidson XL 1200 C Sportster Custom...

1 Answer

Only running on the number 1 cylinder and 4 cylinder


One coil works #1 and #3 cylinder and the other one works #2 and #4, it could be a bad coil or fouled plugs on the dead cylinders.

Dec 27, 2012 | Suzuki GSF 400 Bandit Motorcycles

1 Answer

88 softail custom starts up on one cylinder and only runs on two after about 5 miles. Changed plugs , leads & coil. Can you help


Sorry but I don't know anything about the electronics on the newer Twin Cam engines. I work on the carburetor equipped Evos and earlier model bikes. The first thing I'd do is to check the compression when the engine is cold. Check both cylinders and get the reading off the running cylinder to compare the not-running cylinder. If the compression is lower by about 15-20 psi, you may have a blown head gasket. This is one of the three things that you must have in order for any internal combustion engine to run. If the compression is alright, you need to check for fuel to the cylinder and ignition spark to the cylinder. The other two components necessary to run.

Good Luck
Steve

Mar 10, 2011 | Harley Davidson FXST - FXSTI Softail...

2 Answers

1975 Honda 500T runs but only on one cylinder. Any ideas why?


It could be a lot of different thing... compression in the cylinder could be too low to support proper combustion, it also could be electrical. If you don’t have compression gauges you cant really do that test yourself, but as far as the electrical goes I can help

First off you will need a water spray bottle, and a spark plug wrench/socket and any tools needed to remove the coils and inspect to see if they are still properly grounded (free of rust/corrosion, and any breaks in the wire or wires insulation)

First let the bike run for about 2-3 minutes to let the exhaust system heat up, the exhaust from the cylinder that is running should be allot hotter then the cylinder that isn’t (yes the none running cylinder is still hot due to heat transfer so don’t touch it!!!)
At this time spray a light mist of water on each of the exhaust in the same spot on the first bend of the exhaust you can reach closest to the cylinder (try not to spray cool water on the cylinder head, in theory it could heat stress, causing it to crack) You should be able to tell which exhaust is hotter by the rate of water evaporation, in turn telling your which cylinder is running

Once you’ve determined which cylinder is running or not for sure take the spark plug and coil's and switch them with the non running cylinder (its a good idea to ark them with a sharpie so they don’t get mixed up, while switching them inspect the coils and spark plugs as well as all grounds and wires for obvious signs of malfunction or breaks in wire insulation

Once you have swapped out the know good components from the running cylinder with the parts in question try to re-start the bike< If it starts let it run again for another 2-3 min and test to see which cylinder was running....

If the problem jumps cylinders you know its either the coil or spark plug...if both cylinders start up now...it was an improper or loss ground causing insufficient spark

If it stays in the same cylinder then depending weather you have an ecu or not, im not sure for that old of a bike, but you could check the pins at the ecu for corrosion and clean them......if not then your last option is to check the non running cylinder compression


Aug 19, 2009 | Honda CBF 500 Motorcycles

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