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Old 07-01-2013, 06:47 PM   #1 (permalink)
Flatblack
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1993 GMC 6.5L turbo 2500 4sp 4x4

Hi I have a 1993 6.5 turbo diesel, that has issues starting, when it ran in winter and was warm from previously running it would start first crank! When it's cold it takes 3 to 4 try's of 10-15 cranks before it starts and it shoots out lots of blue smoke! It's summer and I am trying to fix this problem, I have tried moving the injector pump but not really any difference?
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Old 07-01-2013, 06:53 PM   #2 (permalink)
Mase94
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Glow plugs?
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Old 07-01-2013, 07:21 PM   #3 (permalink)
Flatblack
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I have not changed them because a friend told me to hook them up to an om meter and they seemed to register good do you think that is still the problem ?
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Old 07-01-2013, 09:21 PM   #4 (permalink)
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Ohm meter test isn't always reliable - they will pass if even a little of the plug is working, but old worn out plugs will sometimes only glow on a tiny fraction of the tip but the rest of the plug doesn't properly heat. This won't provide sufficient heat to start the engine.

Of course, if the plugs aren't getting power they won't work either - I'm presuming you've checked that all 8 are getting power when the relay closes and the WTS light is on?
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Old 07-01-2013, 09:26 PM   #5 (permalink)
bk95td
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Only real way to test glow plugs is out of the engine connected to a battery. Resistance check isn't fool proof. You could have a air leak in a fuel line causing it to loose prime overnight. Worn injectors won't atomize the fuel very good causing hard cold starts also.Lift pump not working and slow cranking speed are other causes. Battery cables can be bad without looking bad on the outside.
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Old 07-01-2013, 09:39 PM   #6 (permalink)
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Quote:
Originally Posted by bk95td View Post
Only real way to test glow plugs is out of the engine connected to a battery. Resistance check isn't fool proof. You could have a air leak in a fuel line causing it to loose prime overnight. Worn injectors won't atomize the fuel very good causing hard cold starts also.Lift pump not working and slow cranking speed are other causes. Battery cables can be bad without looking bad on the outside.
Agree with all the above. The only reason I focused on the glow plugs solely and directly is because he mentions that once the truck is warm it starts fine, but cold starts are the issue with plenty of white smoke. Having had serious glowplug issues in my past (watch the before/after video in my links below) I'm all too familiar with those symptoms.
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Mark - Courtice, Ontario, Canada.
'97 C3500 Crew Cab Long Box Dually 6.5 Turbo Diesel.
Rebuilt with Navistar 506 block spring 2012
Special thanks to Racer55 and WhiteK2500 for their invaluable assistance!
Commercial OTR Driver Since '95

Find my list of reference information HERE
New members, please introduce yourself HERE
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Old 07-02-2013, 08:00 AM   #7 (permalink)
Flatblack
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ThAnks guys, I will start buy replacing the glow plugs!
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Old 07-02-2013, 08:47 AM   #8 (permalink)
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Again, I'm presuming you have checked that they are all getting power, correct? Ohm check is one thing, voltage check is another.
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Mark - Courtice, Ontario, Canada.
'97 C3500 Crew Cab Long Box Dually 6.5 Turbo Diesel.
Rebuilt with Navistar 506 block spring 2012
Special thanks to Racer55 and WhiteK2500 for their invaluable assistance!
Commercial OTR Driver Since '95

Find my list of reference information HERE
New members, please introduce yourself HERE
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Old 07-02-2013, 11:15 AM   #9 (permalink)
Flatblack
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Yes I did when the problem surfaced during the winter but I could do the ohm check again! Also last night my dad and I were reading a Haynes manual and it said that for the year 93 6.5 L take 9G (6 volt) glow plugs and so I popped one out and it said 10.5 V I am understanding that these are the wrong voltage of spark plug! Also while it was out I connected a battery negative cable around the outer sheath and hooked it up to the glow wire and turned the key, it did not glow red it just got warm and smoked a bit? Do glow plugs glow bright like fire?
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Old 07-02-2013, 11:26 AM   #10 (permalink)
JMJNet
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It is 12V system. Yes, GP should glow bright red to heat the fuel so it can combust.
That 9G is known to swell also if not replaced over time.

Replace it with Bosch Duraterms 80034.

RockAuto has them for around $8 each shipped.
There is a coupon in the RockAuto vendor section in this forum for 5% off that should cover some of the shipping cost.

During the process, you may want to check all the electrical connection.

Make sure LP is running when engine is running, etc.
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