Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [spark]

45 questions
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Car only runs when I am cranking the car

I have a 1973 Datsun 240k that will only run while I’m turning the key and engaging the starter. As soon as I let go of the key the car immediately dies What would cause this?
Barney Chambers
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Spark plug working fine in free air, but hard miss in engine

This is mostly a curiosity question as replacing the spark plugs solved the problem. I have a mercury 40HP outboard two stroke motor. It is a twin cylinder and after running it out of gas it began to have a hard miss on one cylinder. I diagnosed it…
Brydon Gibson
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Engine cranks but won't start

I finished assembling my old Skoda Estelle engine, fully tighten, valves calibrated, etc. It turns, a bit "tight" i.e, not "loose" like before but it may be because I put new rings and different liners. It turns but it won't start. I didn't mess…
Aram Alvarez
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Is there a risk of igniting the incoming charge with wasted spark systems?

I came across a question about wasted spark systems, and I was wondering whether there is a risk of prematurely igniting the incoming fresh mixture charge with that wasted spark. At the top of the exhaust stroke, the inlet valve is opened already.…
Bart
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WOT uphill, no increase in RPM, consuming more gas?

I own a city car Chevrolet Spark 2016. When going up a steep hill say in 4th gear, having the throttle down at 60% or WOT is practically the same. There's a minimal increase in RPM and power. Will the vehicle consume the same amount of gas if at 60%…
Fideon
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Car won't start

My Chevy Spark 1.2 L 2012 model overheated and blew the head gasket. I replaced the gasket and spark plugs. The engine is turning, but it won't start. Plugs do get petrol. Engine sounds like sewing machine when turning. Any suggestions.
Koos
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Engine Misfire: Which is cylinder 2? 2007 Hyundai Santa Fe

I have a 2007 Hyundai Santa Fe that gave me error code: P0302 - cylinder 2 misfire How do I identify which of the coils is cylinder 2? There are 3 on the front (bottom of pic) and then 3 on the back underneath that silver thing. The picture was…
sushi
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Small spark can be seen after replacing spark plugs

I have replaced spark plugs for my 2005 vw fox. I noticed that in one cylinder I can see a small spark coming from the spark boot. It only appears on one spark wire. Do you guys know if this is important issue? Also the wires are quite new and I…
Mantelijo
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Do I Need to Ground the Spark Plug When Testing

When I'm using a known good spark plug to test spark at each wire, do I need to ground the threads of the plug to the engine block like the guy in this video is doing? What happens if I don't ground the threads and just let it jump through the air…
Robert S. Barnes
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Car turning off everytime I idle

My car currently has multiple fault codes: P0031 - Heater control unit (HO2s) P0037 - Heater control unit P0403 - Exhaust gas recirculation P0342 - Camshaft sensor My mechanic says we will need to replace the O2 sensor and it will fix it, but…
Anand
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any downsides to early spark plug changes?

Are there any downsides to early spark plug changes? some say 10k 15k etc and some do it as early as 5k =S but would it be okay to get into the habit of changing them after each oil change (6k) miles or am I going to get any problems doing it this…
ceefax12
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No ignition lights and spark

I have a VW Golf 3 GSX 1995 carburetor. Yesterday it just died after a few attempts cranking the engine. I noticed the ignition lights were not lighting up. I then checked all fuses: all OK as well as the No18 as indicated as engine but not sure of…
Victor Visser
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Does starting the engine with one of the spark plug wire disconnected damage the starter coil?

A friend of mine (he is not my friend anymore) decided to pull a practical prank on my new motorcycle. He pulled the wire of one of the spark plug (my bike has three of them in the cylinder) and let it hanging by the engine case. I cranked up the…
Sandepp
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1993 Ford Probe GT that has no spark and can't hear fuel pump kick in?

I had this car for three days. On the first day it was perfect and then the second day it just stopped out of no where. I started it up and it kept doing it every now and then until it never started up any more. I now have no spark and no…
David.T.W
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When does the spark plug ignite the air fuel mixture?

Some people say it's at the end of the compression stroke, some people say beginning of the power stroke.. What do you guys think ?
venomx
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