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Diesel engine tune-up

How to test fuel injector and glow plug?

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Gas engine tune up

Posted on Sep 12, 2011

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Ford e 350 runs rough blows black smoke until you restart it


the truck is either an e350 0r f250 right? now which?
Gas powered rigs ? call the dealer to inquire about outstanding recalls. inspect your fuel pressure regulator for the correct number
F4TZ or newer should be seen. check the oil dipstick for a fuel smell. if the spark plugs show excessive fuel or carbon. change the oil first, and the filter. then use an update regulator, and tune up.
diesel rigs? theres a possibility of fuel injector pump and or injector problems. first determine the glow plug system is right. see a diesel tech about what diesel fuel system yours is equipped with, do the required maintenance, and with good parts does it smoke cold only, warm only or both. then you can begin to get answers. several systems were used and engine displacement must be known to look it up. a faulty glow plug controller or inoperative glow plugs can contribute to cold smoke, a faulty injector pump or leaky injectors can cause warm smoke. some diesels have the newer system and there are a series of updates you must have. parts are very expensive so do your homework first. build date, engine size, injector type, outstanding recalls, tsb's tech service messages. these can all be found at the ford dealer. they will be happy to answer your questions.

Feb 02, 2014 | 1994 Ford F250 Supercab

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Replaced engine in bobcat. It a diesel, and I know nothing about Diesel engines. There is only two wires coming from the injector pump. That's it. I bleed all the air out of the lines and it still won't...


Not sure about that particular engine - but one of the thing that needs to work, assuming the timing and compression etc are good, on a diesel engine in order for it to work is the fuel solenoid. It has to have 12v of power to it in order to let fuel pass to the engine. When power is turned off the valve shuts and stops all fuel. It is located on the injector pump and will have one hot wire when the ignition is on. You can hear and feel it click open with the ignition turned on/off.

You also need power going to you glow plugs prior to turning it over - check you are getting power to the plugs with the ignition on(power should come one for 5-15 seconds or so and then turn off), a simple test light works to test power - I have also installed an engine that had all four glow plugs that were bad, if it is a used engine I would just change these so you know. You may have power to the glow plugs, but that doesn't mean the plugs themselves are good.

If you have this working properly try using a low volume inline fuel pump before the injector pump just to get it primed and running.

Sep 20, 2013 | Isuzu Cars & Trucks

1 Answer

Landcruiser early 80 turbo diesel wont start


Presuming it is swinging (starter turning engine) and the glow plugs are working well and diesel is clean, the other alternatives are a drop in fuel pressure through the injectors which is necessary to ignite the diesel, or engine compression. If the compression is too low the diesel will not ignite. Test the injectors and compression across al cylinders. Being a turbo the compression si already lowered and the slightest drop will have an effect. Happy hunting.

Apr 16, 2013 | Cars & Trucks

1 Answer

95 Courier with Mazda diesel is hard to start, runs rough, blows lots of blue smoke and won't go over 60kph in top gear


I'd get your injectors rebuilt, and tune up your injector pump. Run a little seafoam in the diesel tank, and in the oil. Should make it clear right up.

Mar 29, 2012 | Cars & Trucks

1 Answer

2003 f250 6.0diesel will not start has fuel at fuel filterwill try to run on starting fluidwith interminent spray


fuel at fuel filter doesnt mean its getting the correct pressure to operate the injectors. do not spray starting fluid into a diesel motor, you will damage the rings, score cylinder walls, burn valve guides... etc . starting fluid is not designed for diesel engines. the only way to test the fuel system is to test it by hooking up a pressure test gauge to the service port. the next most likely issue would be a faulty glow plug relay or 1 or 2 faulty glow plugs.

Mar 13, 2012 | 2003 Ford F250 Super Duty Crew Cab

2 Answers

Does a toyota hilux surf 1995 diesel have spark plugs and points as in the days of yore??


Diesel engines don't have spark plugs. They use compression and heat to fire the diesel. Most diesel engines have glow plugs which are designed to preheat the combustion chamber to help burn the diesel fuel when you start it up. Hope this helps.

Aug 14, 2011 | Toyota 4Runner Cars & Trucks

1 Answer

Glow plugs might be on when starter is not engaged. wont cold start. have new g plugs no fuel leaks


That is a self priming system on the 6.0 diesel. It has an electric fuel pump check to see if you have fuel getting to the filter up on top of the engine. If you crank the engine and immediately loosen the upper filter housing or crank the engine over with the cap loose it should spray fuel. If you have fuel spray up on top than you most likely have a computer or injector problem. I did have a 6.0 once that would not start because of a shorted out fuel injector. Also check your engine oil level the injectors in that engine are operated by oil pressure. No oil no start.

DO NOT USE STARTING FLUID of any kind on that engine or any engine with glow plugs. Severe engine damage can and will result from use of starting fluids in diesels with glow plugs or heating grids.

The only exception is if you disable the glow plugs or heating grid before using a starting fluid and even then you need to be certain that you know what you are doing

Feb 28, 2011 | 1988 Ford F 250

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I am driving a 2006 KB 250 fleetside, just over 101250km. This is my first diesel vechile and i`m abid worried about my fuel consumption. Done a trip to luderitz recently and used about 38 lts for 390 km...


The injectors have o-rings that will wear and cause fuel leak into engine and cause same smoke problem ,but glow plugs are only for engine firing.........you can change o-rings only but if it has lot of miles i would do injectors...
however make sure the fuel rail isnt leaking at injector connection.also check exhaust for excessive heat or noise inside cat.converter if you can shake it.....some come apart inside.....
it would be worth having the engine scanned to make sure 02 sensors are good..they control air/fuel mix and if oxygen level is incorrect it will burn more fuel and sometimes fuel scent but not very bad.

Feb 19, 2011 | 1985 Isuzu Pickup

1 Answer

Slugish start on my excursion


Glow plugs do not "fire". You may be confusing the function of glow plugs as analagous to spark plugs in a gasoline engine; the purpose of glow plugs is to heat the air-fuel mixture to a temperature that will support the diesel auto-combustion process. The diesel process is not one in which the air-fuel mixture is ignited via spark like a gas engine; rather, the air-fuel mixture undergoes much higher compression and spontaneously explodes, generating the combustion in a self-sustaining manner. High compression produces much higher heat, but before it can begin, heat must be introduced into the system to get it started.

If you're having sluggish engine performance from your diesel engine, you may have fuel system issues such as fuel pump failure or fuel line restrictions (including fuel filter or strainer clogging), etc. At the "worst" end of the spectrum, one of more of your fuel injectors may have a problem - the fuel injectors on the Powerstrokes not only inject the fuel into the combustion chamber, but are also cooled and lubricated by the fuel - if the vehicle has ever been run out of fuel, the injectors may have been damaged and will need to be inspected for replacement.

Jun 29, 2010 | 2004 Ford Excursion

3 Answers

Will not start in cold weather. Starts great if temperature is above 20 degrees. New battery and no problem found by mechanic.


There is a 5th injector called the cold start injector, that is electrically controlled off the starter. You can easily unscrew it while still attached to hoses and wires, and watch it squirt. You can also verify it is getting voltage with a test light or meter. There is also a thermal timer for it that could be bad and preventing current from the starter.

Jan 03, 2010 | 2002 Volkswagen Jetta TDI

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