ignition timing
Have a strange one here, started out as an intermittent shudder when hard accelerating. rotor button and dizzy cap had scene better days so swapped them out. didn't fix it and it progressively got worse. checked fuel filter absolutely chocked with crap. swapped it and cleaned fuel lines. got worse so had injectors cleaned and tested they where pretty bad but after a day in the bath tested fine. didn't fix it got worse get the car to 2500 revs and you can here it gurgling in the air intake checked valve timing belt a had scene better days was a little stretched so replaced didn't fi
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Hello. Depending on your model of vehicle a few different things can cause these symptoms. If you believe the issues may be timing related then a few things I would look at are the ignition module, the cam position sensor, and the crank position sensor. All three of these components play a significant role in the engine’s timing, and any faults with them can cause the timing to be thrown off. Similar symptoms can also be caused by mechanical issues. If the engine uses a timing belt or distributor, and either of them as a mechanical issue, such as jumping a tooth due to wear, it may throw off experience performance issues like the ones you describe. Depending on the model of engine you may be able to remove the ignition module and have it tested before deciding to replace it. If you are unsure, I would recommend having a professional technician, such as one from YourMechanic, come to your location to (determine the cause of the performance issues)[https://www.yourmechanic.com/services/engine-is-sputtering-inspection].
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Ideally, the time at which the mixture should be fully burnt is about 20 degrees ATDC. This will maximize the engine`s power producing potential.
Most stock street engines call for 6 to 8 degrees of initial advance, but this is not set in stone. Engines with longer duration camshafts and other modifications often demand more initial timing. It`s not unusual to input 14 to perhaps 18 degrees of initial timing for engines with big cams.
Initial timing, or the 10 degrees we mentioned earlier, is your timing setting at idle. Total timing, which may be something like 34 degrees of advance, is what the timing changes to when the engine is up to speed. The reason the timing needs to change is due to the increased speed of the engine.
When any changes are made to the engine of a car, the ignition timing is adjusted accordingly. If not, you could experience several problems with your engine with improper ignition timing like knocking, hard to start, increase fuel usage, overheating, and reduced power.
Fifteen degrees before TDC means the spark plugs would fire when the crankshaft is still 15 degrees of rotation away from when each piston reaches the top. In reality, the timing of the spark is supposed to vary. At idle, it`s supposed to be TDC.
That is typically 15-35 degrees before TDC (top dead center) of the power stroke depending on the engine speed.
The relationship between crank and cam timing events can also cause no spark, especially on Chrysler products. On these vehicles, the PCM won`t trigger the ignition coil if the cam and crank are out-of-sync.
Different types of timing
There are two kinds of timing, cam timing and ignition timing.
A broken timing belt can cause severe engine damage that could cost you thousands to repair. To avoid this from ever happening, have the timing belt changed at the mileage milestone recommended in your owner`s manual.
A flat surface has an angle of 180 degrees.
Most engines set ignition timing somewhere between zero and 20 degrees before top dead center. This is called base timing. When set, the ignition system and engine are timed so the fuel in a cylinder is at its peak burn just as the piston compresses the fuel vapors into the smallest amount of space.
The metric that identifies when the spark plug is going to be arced is the piston`s location in reference to top dead center (TDC). Thus, if the timing specification is 6 degrees before TDC (BTDC), the spark plug will arc when the crankshaft is 6 rotational degrees before the piston is at TDC (BTDC).
Typically a spark advance of 1 to 1.5 degrees increase per 1,000 RPM is characteristic of an engine demand.
1. Timing Advance. Timing advance means your spark plugs fire earlier in the compression stroke, farther from Top Dead Center (TDC). Advance is required because the air-fuel mixture in the combustion chamber doesn`t burn immediately, and it takes time for the flame (spark plug fire) to ignite the mixture.
1. Timing Advance. Timing advance means your spark plugs fire earlier in the compression stroke, farther from Top Dead Center (TDC). Advance is required because the air-fuel mixture in the combustion chamber doesn`t burn immediately, and it takes time for the flame (spark plug fire) to ignite the mixture.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
At times my jeep will start fine and at times I have a hard time getting it to start. It seems like the wireless ignition node is
ANSWER : The recommended diagnostic to resolve this is a hard starting diagnostic. The work is performed by a certified mechanic right at your location. Among the first things the mechanic will check is whether required maintenance is up to date because old spark plugs, clogged fuel and air filters, and the like are potential causes of the hard starting you are describing. Other possible causes include a failing coolant temperature sensor, or bad connection to the sensor, problems with other sensors such as the cam and crankshaft position sensors, a defective fuel pump, and many other causes, all of which will be familiar to YourMechanic’s experts. With regard to the fuel pump, if the engine is not getting enough fuel it will be hard to start. If you request a hard starting diagnostic, YourMechanic will get this issue diagnosed and resolved for you.
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need a way to retain the timing chain
ANSWER : The best way to approach this unfortunately is by using a timing chain tool retainer/holder tool. You may consider having an expert from YourMechanic come to your home replace the timing chain.
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Timing chain positioning
ANSWER : This system is a bit complex. I can give you some instructions, but I highly recommend getting a hold of a repair manual or purchasing a yearly subscription for just your vehicle from AllData. It is only $25 for a years subscription from AllData.
There are two separate sets of marks on this system. One set is for aligning the timing chain to the camshaft gears and the intermediate shaft gear. There will be marks on the chain that raps around the crankshaft gear as well. These marks will not line up after you turn the motor over.The other marks are on the inside of the camshaft gears and align with the cylinder head parting line. If you were to draw a ling through the center of both camshaft gears, they should line up with that imaginary line.
The crankshaft key way should be aligned with the mating face of the main bearing cap. You can confirm it is in the correct position by verifying the number one piston is at top dead center. If you have removed the balance shaft timing chain, these marks really need a visual diagram to understand where they should be aligned. Without a diagram I am not very confident it can be explained very clearly.
This may be difficult to to follow, so again I highly recommend purchasing a repair manual in digital form or a book. If you feel this is over your head, I recommend the following inspection to help you out. Timing chain replacement
Good luck! I hope I was able to help you.
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hi- i got an estimate to replace my timing belt and water pump for my 2012 pilot. Do these figures seem right? Timing belt (35.00)
ANSWER : Hi there. That is a fairly good and detailed estimate for this type of service. It also falls within the price estimation to have a mechanic shop complete this service. However, you might want to consider a third option, of having a professional mobile mechanic come to your location and complete the timing belt replacement and water pump replacement. Simply click the blue links to receive an estimate for both services.
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My car twice out of 4 times today would not start on the first time. Second time started fine. At 2 read lights it was sort of je
ANSWER : Hello, thank you for writing in. Your symptoms point towards an issue with fuel or spark. If you just had work done on the fuel system, you may wan to have your fuel pressure tested at the engine. This will let you know that the lines, filter, and pump are all working correctly. You should also have the ignition system tested. This would mean inspecting the spark plugs to make sure they are in good condition, and making sure the plugs are receiving spark. Testing for spark is best done with a simple spark tester that is inserted into the plug’s wire. If having trouble starting, turn the key to the "On" position before starting, and let it sit. This give the fuel pump a moment to prime. If you do not hear the faint buzzing of the fuel pump priming (you may have to listen closer to the fuel tank), then you may be having issues with the pump. Only further testing will tell. For more help with testing and repairs, contact our service department to schedule an appointment.
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1992 Acura Legend, when the timing belt goes, is it common for the valves to bend?
ANSWER : If the timing belt break off, the engine’s pistons will hit the valves as the pistons are moving. The engine is an interference engine and can cause damage to the internals of the engine. The last time the belt came off, the engine may have been running at an idle or not under power. It is possible for the valves to be bent. What I recommend doing is performing a leak down test on the engine with a timing belt on the engine and properly timed to determine if the valves were in fact bent. If all of the cylinders have a 80 percent hold and not leaking, then the engine is fine. If there is a mass leak on a cylinder, then the piston did some internal damage. I recommend seeking out a professional, such as one from Your Mechanic, to help you check your engine’s valve train with a leak down tester.
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Billing and parts question was sent to CS for the cost of parts and labor for valve train and related parts from a broken timing belt for a 1992 Acura Legend with a V6-3.2L engine.
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Car hesitates and slows down badly at times. It almost stalls at times. It keeps slow speed at 20-30KM.
ANSWER : Hello. I would need to know the year of the vehicle to know where the fuel filter is located. If this is an older model, it is located under the vehicle. Most of the newer models only have a filter on the fuel pump.
From what you are explaining, it sounds like the fuel pump is failing. When the fuel is low, the pump will get hot and a weak pump will lose pressure causing this to occur. I would usually check the fuel pressure to see if it is low, especially when the fuel level is low. If it is, then the pump needs to be replaced. If you plan on having this done, consider YourMechanic, as a certified technician can come to your home or office to diagnose the hesitation problem and guide you with repairs.
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When I went to change the timing belt there were 25 teeth were missing but it didn’t jump time – how is this possible?
ANSWER : Not all the teeth need to be present in order for the pulleys to turn. However, the only way to tell if the cam and crankshaft were really in the right position relative to one another is to line them up before taking the belt off and when the engine is at TDC on cylinder 1. If all the pulleys were lined up to the marks that are embossed on the engine, the only explanation is that the few remaining teeth were stout enough to turn the pulleys without breaking. However, even that doesn’t seem likely, especially since 25 missing teeth in a row would suggest that there weren’t even enough teeth for the belt to fully engage the crankshaft timing gear, thus slippage would have been inevitable. If the 2.0L engine you have has a double overhead cam, that is an interference engine (the single cam version of the 2.0L is a non-interference engine). If you’d like a professional technician check out the engine for damage, due to the failed belt, and/or install the new timing belt, consider YourMechanic.
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