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26 votes
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How does the car's ECU detect a misfire?

This comes directly from this web site: http://www.obdii.com/articles/Onboard_Diagnostics_Demystified.html What it says, is that early OBD-II systems could not detect misfires, but since then a few ...
cdunn's user avatar
  • 9,296
26 votes

How can I disable my 2002 Ford Explorer so someone with a key can't start it?

If your friend is moving your vehicle without your consent and does so deliberately your friend is committing a crime. Vehicle theft. If you are asleep when this happens then consent was not given. I ...
Old_Fossil's user avatar
  • 3,962
26 votes

How can I disable my 2002 Ford Explorer so someone with a key can't start it?

I'll make it very simple for you, Dave. Just remove the relay highlighted, in yellow, from the diagram above. This goes to the starter.
Lawyer Aidroos's user avatar
26 votes
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What is the most cost-efficient solution when door keys do not fit ignition?

Being a auto locksmith, I can 100% recommend that you have your door lock rekeyed to match your current ignition key. Cost will depend on location and if you remove the the lock yourself and take it ...
narkeleptk's user avatar
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20 votes

How can I disable my 2002 Ford Explorer so someone with a key can't start it?

Remove the publicly available key. Make one copy of the key for each person or household who needs to be able to move the car. Give a key to each person and have them sign an agreement that they ...
barbecue's user avatar
  • 1,597
12 votes

How does the car's ECU detect a misfire?

Engine misfire can also be detected by looking at the coil voltage just after the plug is fired. When the fuel/air mixture actually ignites there are lots of ions and radicals floating around. This ...
Autistic's user avatar
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10 votes
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What Could Cause Flash Over / Arcing to Reappear on New Plugs?

I think your problem is your plug wires. I think they are leaking along the boot and down to ground (earth). With this loss of energy, you'll also see the large carbon buildup on the business end, due ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
9 votes
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Diesel engine timing?

Diesel engine timing is accomplished through the fuel injectors (they inject fuel at the proper times). Proper timing prevents pre-ignition because there's no fuel in the cylinder yet to ignite. Glow ...
Jason C's user avatar
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9 votes

How can I disable my 2002 Ford Explorer so someone with a key can't start it?

As stated in other answers, you really need to get your new housemate to start listening to you. If he doesn't respect your property, do you really want him living with you? With regards to the ...
Steve Matthews's user avatar
8 votes
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How Common are Voltage Drop Problems?

Voltage drop problems are very common in multi component, multi interface systems. For instance the starter motor has a cable that runs from the battery to the starter. The cable has ring terminals ...
vini_i's user avatar
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7 votes
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How to check if spark plugs are firing? Coil-on plugs

You should have 2 coil packs on the back side of the engine near the throttle body. Wires run to individual cylinders. I don't know how easy it would be to find locally but you can use an inductance ...
Ben's user avatar
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7 votes
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Effects of shutting off Nissan altima (or any car) while in drive

The transmission and its control systems will not be damaged by this practice. Safety could be compromised if the shifter is left in this position. The park lock will not be engaged so the vehicle ...
Fred Wilson's user avatar
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7 votes
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Simplest installation of car-powered car-pc

Most everything external of the ECU is going to be 12vdc (+/-2v). (NOTE: As @juhist points out, more and more cars are supporting 5vdc output to charge handheld devices through USB ports. 5vdc may ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
7 votes

Key won't turn in Honda Fit after ignition cylinder repair

I repair these quite often, even for Honda dealerships in my area. Its possible you just lost the key buzzer lifter and the now the key buzzer is dropping past the cylinders sheer line. Other then ...
narkeleptk's user avatar
  • 3,780
6 votes

How does the car's ECU detect a misfire?

Variations in current drawn by the "high-tension" (HT) coils can also identify misfires to the engine ECU. This is one reference that I found to back this up AutoTap: Analyzing Ignition Misfires (...
HandyHowie's user avatar
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6 votes
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Is it normal that a cold engine takes longer to start?

I don't know about longer (this is relative to the exact engine being served and the ignition type), but it is harder to start a cold engine. There are a couple of things going on with the engine ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes
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1996 Nissan Sentra won’t start after refueling

I think you are looking at the wrong area of the car. If the electronics didn't come on, this is an electrical power issue, not a fueling issue. I'd check to ensure all connections are good from the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
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Are There any Benefits to a High Voltage Coil Pack?

Go with the standard replacement (the warranty choice is left up to you). High output coils are used in modified engines that have higher combustion chamber pressures from either higher compression, ...
race fever's user avatar
  • 3,353
5 votes

what happens when you hit engine button on a keyless ignition?

I rented a ford mustang, while reaching to adjust the a/c controls while driving on the interstate my finger accidentally hit the stop start button and at 70 mph the engine immediately shut down. The ...
Ken James's user avatar
5 votes

Is there a way to test ignition coils with built-in ICM?

Honda Coil Over Plug setups have three wires. As mentioned they have an internal Ignition Control Module. Pins 1 & 2 are power and ground while pin 3 is the control signal from the Electronic ...
Ben's user avatar
  • 10.7k
5 votes

mercury milan key stuck in ignition, shifter will not come out of park

Yes, there is an interlock between the ignition and the shifter, as well as an interlock between the shifter and the brake pedal. Something could have gotten messed up somewhere. There is a ...
zipzit's user avatar
  • 6,559
5 votes

What are the disadvantages of wasted spark ignition? (Consider single cylinder engine)

I think you miss understand the reason for waste spark. The example you give of a single cylinder engine puts you in the realm of lawn and garden equipment. 90% or more of such engines use a magneto ...
vini_i's user avatar
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5 votes
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How does the Prius (2011) re-ignite the gas engine without causing too much wear on the ignition?

The Prius doesn't start traditionally. It actually has two motors, MG1 and MG2 (MG = Motor Generator.) MG1 replaces a traditional starter motor in the sense that it is responsible for spinning up ...
Tedwin's user avatar
  • 413
5 votes
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What are the benefits of direct ignition (coil on plug) system?

Coil on plug has several advantages over conventional distributor type systems: 1) Less voltage loss from the coil to the plug. With fewer connections and the elimination of the distributor rotor to ...
Fred Wilson's user avatar
  • 11.6k
5 votes

How can I disable my 2002 Ford Explorer so someone with a key can't start it?

Remove fuse #26 (Brake-shift interlock) and the starter relay. This will prevent the "friend" from starting the car, and will also prevent the "friend" from simply putting it in neutral and pushing ...
Eirc's user avatar
  • 51
5 votes
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Is it possible to actually run on fumes

It's just an expression, car engines require liquid fuels. Once you get down to vapors the pump cannot pressurize the fuel system, even if you had pure gasoline/petrol fumes there simply isn't enough ...
GdD's user avatar
  • 17k
4 votes

My Yamaha cut off while idling and now there is no power

I would suspect one of two things. Your main fuse is blown. This would disable your entire electrical system and prevent the bike from lighting up or starting. Your ignition switch has failed. If ...
DucatiKiller's user avatar
  • 32.9k
4 votes

volvo ignition key

If you are looking for a method by which you can diagnose the problem to confirm your suspicions that one of your keys has failed I can suggest the following. In close proximity to the ignition ...
Steve Matthews's user avatar
4 votes
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2000 Honda Accord - Attempts to start cause lights to go out with no clicking and fails to start

This problem is usually indicative of a bad connection at the battery (or one of the battery cables). It almost behaves like a resettable fuse. When there is a connection, the lights work because the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

2008 Grand Prix GPX

Mitchell shows original equipment plugs are ACDelco 41-962 for the 5.3, which are double platinum plugs. Plug gap is 0.040". I've never used nor sold Bosch plugs before. From talking to people, I've ...
Ben's user avatar
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