Questions tagged [ignition]

For questions related to the process and components that generate the spark that ignites the fuel-air mixture in gasoline engines.

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14
votes
12answers
103k views

Couldn't start my Volvo due to Key Error. Called assistance and he fixed it by hitting the key with a screwdriver. What could be the error?

My Volvo S40 (06) would not start when I turned the ignition key. I got a message that was somewhat like "Key Error, please try again". I tried with both my keys so it wasn't the key itself. I think I ...
11
votes
2answers
14k views

My Ignition Timing is Retarded, no seriously, it's really screwed up

I logged some test data to try and help me figure out why my 98 Mazda 626 GF 2L ATX has a rough idle and is suffering from hesitation. (Speed k/h),(TPS_v),(MAF g/sec),(RPM),(SparkAdvance),(EngineLoad)...
14
votes
5answers
35k views

What Color Should the Spark Be When Using a Spark Tester?

If I'm using a spark tester with an adjustable gap set to the correct gap for my car's ignition system voltage, what should the spark look like? I ask because I've seen conflicting opinions on this ...
8
votes
1answer
4k views

How to check if spark plugs are firing? Coil-on plugs

While trying to diagnose a tricky car not starting problem I was asked to check if the spark plugs were firing at all. I've found plenty of resources on inspecting the condition of spark plugs after ...
8
votes
2answers
3k views

What Could Cause Flash Over / Arcing to Reappear on New Plugs?

I had been having some hesitation problems on my 98 Mazda 626 which after a great deal of research seemed to be solved by replacing the plugs: As you can see, there seems to be signs of flash over / ...
8
votes
1answer
12k views

Acceptable amount of slack in a timing chain with high mileage?

1995 Chevy S-10 Blazer - 4.3 L Vortec V6 (vin W with PCM) - 230,000 miles original owner. FWIW, this model car/engine does not have timing chain inspection and/or changing as part of the routine ...
4
votes
1answer
4k views

2004 GMC Yukon Denali, intermittent no crank/no start/no noise

OK, it started doing this a few months back with no rhyme or reason. Before this happened, sometimes would start beeping after engine start. A long 18 beep procession. Don't know if related. When ...
6
votes
2answers
62k views

OBD II power when key not in ignition

I can't get to the OBD connector on my car at the moment. As far as I know the OBD II voltage is active even when the key is in lock. Can anyone confirm this? edit : It's for a product that will be ...
5
votes
3answers
8k views

Start a circuit or device when you insert key in car ignition

I want to start a circuit in my car when I insert my key in car ignition and let it turn off when the key gets removed. I have Honda Civic 2007. Can someone just help me out as to from where do I take ...
17
votes
3answers
14k views

How does the car's ECU detect a misfire?

I was wondering what the specific mechanism used by car ECU's to detect misfires is, or are if there is more than one method.
3
votes
1answer
9k views

What is an igniter?

In researching this question about the behavior of the tach on a Mazda Miata I came across references to a part called the "igniter" that apparently has a role in generating the signal that drives the ...
5
votes
2answers
297 views

2000 Honda Accord - Attempts to start cause lights to go out with no clicking and fails to start

I tried to start my car less than a minute after turning it off last night and it wouldn't turn over... it wouldn't even click. I tried a few times and then let it rest. After a 30 minute phone call ...
5
votes
2answers
7k views

Diesel engine timing?

A petrol engine can fire the spark plugs slightly earlier or later to account for factors like revolution speed and engine temperature. However a diesel only fires when the mixture is compressed. ...
5
votes
2answers
12k views

What is an acceptable amount of up/down play in a distributor shaft?

1995 Chevy S-10 Blazer - 4.3 L Vortec V6 (vin W with PCM) - This is the distributor style with vertical cap posts. 230,000 miles original owner. EDIT: Please click on link below to see a photo of ...
5
votes
4answers
2k views

Emissions Problem: Lambda AND CO Slightly High on my 98 Mazda 626

I just took my 98 Mazda 626 for it's inspection and they said the carbon monoxide is slightly high. The test is done using a tail pipe gas analyzer while holding the RPMs between 2500 - 2800 for ...
4
votes
2answers
1k views

Intermittent no crank issues

My girlfriend has 2003 VW Beetle (2.0L, 5-speed manual). Sometimes, when you turn the key to crank over the car it tries to turn over but then hits a wall. No clicking happens at all. It starts to ...
4
votes
3answers
96k views

Car will not start Sometimes?

Hey i just wanted to ask about my girlfriends car she has been having problems with for over a year.. we had it checked but they always say nothing is wrong (usually because the car starts when they ...
4
votes
2answers
4k views

Ford Focus - bad starter?

Car 1.6L Ford Focus estate, made in 2000. It is right hand drive, although I doubt that matters. Issue When the ignition key is turned from "On" to "Start", there is a click (sounds like a relay ...
4
votes
1answer
183 views

What Is The Output Voltage For The Mazda 626 GF 2L 98-2002 Coil Pack?

I've seen aftermarket "high voltage" coils that output 40kV, but what is the output voltage for the standard OEM coil pack? I want to use a spark tester with an adjustable gap to check the strength ...
2
votes
3answers
14k views

Screeching noise when attempting to start car

I have a Ford Bantam 1.3l pickup (South African) with 31 000 km on the clock. This morning when I tried to start the car (cold start), it made a loud scratching/screeching noise (like when turning ...
1
vote
1answer
78 views

car wont start after attempt to change ignition switch and battery sparks

Car is a honda civic vti 1999. was going to change the ignition switch since its faulty though by holding crank you can get it to start. first i tried to disconnect battery(safety since starting ...