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Need help my only transportation, just replace glow plugs now runs really bad

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  • Angelo Attard
    Angelo Attard May 11, 2010

    why did u change glow plugs

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Did you undo any fuel lines if so try and undo the fitting a turn and then crank the engine till a good amount of fuil comes out then lock them up and run the engine see how it gos

Posted on Dec 21, 2008

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Posted on Jan 02, 2017

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1 Answer

My ford 6.7 diesel cranks over fast,but does not start


There can be several reasons for this. The cheapest reasons to look at are spark to the glow-plugs and fuel to the cylinders. If you have a "ready light" on the dash that tells you when the glow-plugs are ready, you need to listen for the clicking of the glow-plug relay and the blinking of every other light that is on in sync with the clicking sound.

If the clicking and light dimming is not observed your power relay to the glow-plug relay is probably bad. A voltmeter will be needed to test for juice passing through the the power relay. If you have juice going to the glow-plug relay from the power box relay and it does not cycle off and on, your glow-plug relay is bad or the glow-plugs are bad.

You can test the power to each glow-plug with a test light or meter (when the power relay and glow-plug relay are cycling). Glow-plugs are similar to spark plugs and they can be tested. It can be tricky or you can just replace them.

Fuel, this time of year is subject to freeze-ups. Additive will help, noting Diesel additive and NOT gasoline additives. In short, Pyroil makes a starting fuel which has protective oil in the spray to help the cylinders. A spray of starting fluid will diagnose that fuel starvation is the problem. It is tricky to use when the glow-plugs are hot. On injector systems with O rings the cold weather can sometimes cause the O rings to shrink when sitting and leak. Your fuel will run back to the tank. Cranking will not be enough to draw up the fuel. Another way is to change fuel filters BUT to put some diesel into the fuel filter to prime the system. No guaranty that the problem will not reoccur because you have not permanently fixed anything. Hope this helps, if not then something has let loose like a fuelpump.

Jan 08, 2018 | Ford Cars & Trucks

2 Answers

P0674 GLO PLUG #4 CODE. WHAT COULD BE THE PROBLEM. THANKS RAY


ill only speak from my expierence with glow plug.they are designed to warm fuel temperture so you have combustion on cooler days like fall and winter.the ford i worked on had similar codes,it all boiled down to a shorted out glow plug.i replaced glow plug and cked wiring for bad cuts or rubbing against anything.fired truck up and it runs perfect .hope this helps you.

Jul 07, 2011 | 2001 Ford F250 Super Duty Super Cab

1 Answer

Hyundai Accent 1.5 Diesel. Intermittent problem with starting. Sometimes starts and runs fine. However sometimes on starting car will not run above 750 rpm and throws out HUGE clouds of black smoke. ...


it sounds like a glow plug issue. perhaps a bad glow plug relay. I would think its the relay if the problem comes and goes. If it were a bad glow plug the problem would be constant. check for volts at the glow plugs next time the car acts up. If you find no volts, tap on the glow plug relay next time you turn the key on. This may cause it to activate. if so then replace relay

Jan 05, 2011 | 2003 Hyundai Accent

1 Answer

My 2001 F350 seemed to have gelled up overnight with cold temps. I had fuel additive in the system. Once it warmed up today and batteries fully charged, it cranked very slow and then after 3 tries it...


glow plugs may be bad,when starting try turning switch on several times,each time you do,wait for the wait to start light goes off, if it starts like that,then your glow plugs need replacement. you can start it with either spray,but when you do that the motor gets addicted to the bottle,so to speak, then you'll really need to replace the glow plugs if you keep either starting it.when using either spray it into the air induction,use very little either,if you can't find the either,you can use regular starting fluid,but either one you choose,it takes just a quick spray to start. thank you for choosing fixya.com

Jan 04, 2011 | 2001 Ford F350 Super Duty SuperCab

2 Answers

Where are the glow plugs located on 96powerstroke


in teh cylinder head next to the injectors

Dec 24, 2009 | 1997 Ford F250 SuperCab

1 Answer

Glow plug indicator blinking


Your glow plugs are going bad and need to be replaced. This is a sign to you that they are basically running all the time because they dont know that thye are heated up and the car is running. Common problem with diesels

May 28, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Trouble code indicates all four glow plug on the left side bad


The garage should be able to test the glow plugs without removing them. All the need to do is use an ammeter or amp clamp and measure the current drawn by the glow plugs. the glow plugs should draw 16 - 20 amps each. much less than that and they want replacing.

Nov 09, 2017 | 2000 Ford Excursion

1 Answer

Glow plug light


Thats not good, if the glow plugs are being charged the whole time They will burn out quickly if not already. Even if the glow plugs are burned out the engine will still start unless your in a really cold region. Sounds like the GP (GP = glow plug) relay is fused in the open position, its located above the fuse panel refer to your owners manual to its exact location above the fuse panel. Just pull this relay out and your light should go out while engine is running. If this works simply replace the relay from your local Volkswagen dealer, but the bad news is I would highly recommend pulling the GP's out and checking to see if theres anything left of them. There not built to be on constant. Good luck Hope thats your problem just a relay.

Dec 19, 2008 | 1991 Volkswagen Golf

5 Answers

02 VW engine light that stays on


You probably need to replace the glow plug harness. The contacts in the boots that connect to the glow plugs get corroded and throw off the resistance of the circuit. The controller in the VW measures whether your glow plugs are good or not by testing the resistance in the circuit. Test all the glow plugs like DickyIV1 stated and if they are all good try cleaning out the crud on the contacts in the glow plug harness. You will then either need to clear the error code or wait several trips for it to clear itself. If it never clears itself or if it comes back on after you clear it then the glow plug harness is too much of a mess. This is really common on the TDIs (mine needs to be changed but i have been putting it off and ignoring the mil light). When I first tried cleaning the harness on my car it didn't give me a problem for another year and a half. But I knew I'd eventually be changing it.
The other thing to keep in mind is that you should change out glow plugs as a set. It causes less problems in the long run since if one failed you will probably find other will soon fail and it keeps all the resistance close to the same value.

Jul 16, 2008 | 2002 Volkswagen Jetta TDI

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