89 charade, first piston not getting spark, although lead is delivering spark, new plugs in it, but if idling when i pull the spark plug lead off of number one there is no difference to its running, unlike the other leads when pulled off. any sugestions
Check the connection inside the lead wire boot. If you have spark at the wire and not at the plug it can only mean you are not connected fully (or at all) to the plug via the connection point inside the boot. You may need new wires or you may not have pushed the boot on to the plug far enough to make a connection.
Compression has nothing to do with spark so I wouldn't worry about that just yet.
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Do you know which cylinder is number one? Does the balancer have timing marks? if so, put the timing marks on zero, hopefully the number one piston is all the way up. Sometimes you can use a piece of wire in the spark hole to feel the top of the piston, then move crank by hand to feel the piston come up.
You could use a piece if fuel line hose that fit snuggly in the spark plug hole, if you can't blow air into the cylinder, it should be on the compression stroke. There are many ways to check that.
Once you stab the distributor, which ever spark plug tower the rotor is pointing at/leading into, becomes number one. Then you follow the firing order around the cap in direction of rotation. It is possible you may have to move spark plug wires around to get everything to reach.
This info is basic info, your year--make--model didn't post for some reason? I can't look anything up? Because of that, I accept no liability.
I don't know your year--make--model? You should be able to remove dist cap, crank the engine, watch which way the rotor turns, then you know the direction of rotation. Most chevy rwd v8, firing order, 18436572. The driver side bank is odd numbered, 1357.
The passenger side bank is even numbered, 2468 from front to back. Put your number one piston on tdc of compression stroke. Then whichever spark plug tower the rotor is leading into, should be number one, then you follow the firing order around the cap.
The misfire could be being caused by a number of things, such as:
1. Worn/dirty spark plug - Clean/replace spark plug/s
2. Spark plug lead breaking down - Replace spark plug lead
3. Or possibly the intake gasket. If the intake gasket is leaking it causes a vacuum leak. with this vacuum leak at idle it will cause a misfire. - To check this, take a can of carb cleaner (or WD-40 may also work) and when the car is running, spray it along the intake by cylinder number If you see/hear the engine change then you have a leaking intake gasket.
Trust this helps
depending on how you pulled the plug leads off the plugs will result on wether or not you have damaged the leads. It is very easy to separate the wire end from the carbon track inside the lead and so they will misfire.. Suggest you get new plug leads and be careful on how you handle the leads when pulling them off the plugs.
Several factors can contribute to spark plug fouling:
- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system. - Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling. - The ignition system may not be performing properly. - Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem. - A dirty air cleaner can create a too-rich condition which can lead to fouling.
Have each of the above checked and corrected.
Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.
In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.
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Could be a lot of things,
Check spark plug wire
If those are good, get a compression test done to see how the cylinder is.
You could also have a bad fuel injector, which will not deliver fuel.
remove the dizzy cap, crank motor over to find out the rotation of the rotor. Remove the no.1 spark plug and bring no.1 piston up to top dead centre on compression stroke, mark side of dizzy body where the end of the rotor points to, replace dizzy cap and see which lead it lines up with.
that will be your no.1 lead, find the firing order and put the leads back on the dizzy cap in the direction of the rotors rotation, run those leads to the corresponding plugs and it should start.
Hi Roy, You say you have compression? is it well within the range of the other cylinders? if it is i.e. around 100 psi then possible bent or sticking valve? although you have a spark when plug earthed out of head is there possibly some foreign matter isolating the plug or is it the plug itself breaking/tracking down when in situe? Failing all these, try a small amount of fuel direct into the cylinder to see if it fires briefly (Not too much just a couple of mls) Maybe possible Head gasket failure? (I doubt it as all other cyls fine) Can't think of anything else I would try, Hope this helps! Paul 'W' Onyer~EDson(:0)~[><U.K.
Hello darren625, the firing order will be 1-3-4-2, #1 will be at the front of the block,I am not familiar with volks wagon but you can disconnect the power (to be safe) turn the engine over by hand with plugs out for ease use a piece of stiff wire or small screwdriver in the #1 plug hole and you will feel the piston come up make sure it is on the compression stroke (you will feel air escape) when it is at the top before it starts to travel down that will be tdc (top dead center) the rotor will now be in line with #1 connect wires as per firing order and you should be good to go,hope this helps, good luck