- 6,930
- 9,587
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- Papalote, TX
I would do a cylinder rpm drop test as suggested earlier, If you had a cylinder issue it would narrow it down.
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White smoke at idle and driving.
- Thread starter flyn2low737
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If the unburnt fuel is bad enough, start it when cold….turn it off within a few seconds of starting, start pulling glow plugs till you find the wet one, there is your problem cylinder….done it may times
flyn2low737
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I will give that a shot. Do I need a specific glow plug tool for these? I have done plugs and injectors in my truck 7.3 Ford with just standard tools.
- 6,930
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- Papalote, TX
If you have a dead cylinder the idle will not change when you loosen the injector line to that cylinder, no real need for a tach.
If you have a dead cylinder it will be pretty obvious and busting the injector lines is allot easier than pulling the glow plugs.
If you have a dead cylinder it will be pretty obvious and busting the injector lines is allot easier than pulling the glow plugs.
flyn2low737
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Any chance a sticking/failed injector would cause smoke to come out the intake? I ask as the intake bolts were loose on that side and I had soot on the exterior of the intake runners and an exhaust ticking that disappeared when I tightened the intake bolts. Kinda worried I have an issue in the head.
- 6,930
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- Papalote, TX
I am not sure what you were seeing, I would bust the lines loose one at a time and see if I had a dead cylinder, then I would do as RWH said and pull the glow plug on that cylinder and do a compression test.
Usually a bad injector will cause a knock, not always but most of the time.
If you do have raw fuel comming out of the exhaust it is likely a compression issue, if raw fuel is somehow being dumped into a cylinder with compression it will fire early and knock like hell.
- 6,930
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- Papalote, TX
you can also remove the run solenoid wire and if you have a cylinder that has no compression you will hear it "skip" or speed up when it comes to compress that cylinder, will not help to figure out which one though.
flyn2low737
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flyn2low737
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which wire is it? Are we able to attach videos?
flyn2low737
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disregard I found it on top of the injection pump. Other question still. Can we post videos here?
- 6,930
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- Papalote, TX
I post to Youtube and attach a link, others may have better ideas.
flyn2low737
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- Houston
Well correction. Which wire do I pull. There are two I see on the top of the pump?
flyn2low737
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- 6,930
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The one towards the front of the vehicle
flyn2low737
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Alright I found one cylinder that makes the idle worse when it’s tight. When I loosen that injector the cylinder idle drops slightly but the idle overalll is better. There is also a knock I am getting from it but not consistently when the injector is snugged up. The knock definitely subsided when it’s allowed to leak. Sooo sounds like I need an injector but I will verify tomorrow and do a quick start and pull the glow plug on that cylinder. Should I go ahead and do a compression check?
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- 6,930
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- Location
- Papalote, TX
I would be tempted to drop an injector in, unless you just have a diesel compression gauge with the correct adapter handy.
Hopefully it is an easy one to get to.
flyn2low737
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Of course I don’t have that tool yet. Good excuse to get one.
Passenger side 2nd one from the front. Not the best spot. Any suggestions on a good source for the injectors. All the ones I find are for a turbo.
- 6,930
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- Papalote, TX
You can open a can of worms pulling a glowplug, most say if its bad it needs to be pulled anyway, just be ready to purchase a quality extractor if only half of the glowplug comes out.
You might look at the usual places for an injector, mac motors, Seco, hummer parts guy, AMG does not seem to have any listed, you can also put a want out in the SS classified but you have to be a supporting member (everyone should it's a great forum!)
You need to get the numbers off of your pump to match what injector you want
You might look at the usual places for an injector, mac motors, Seco, hummer parts guy, AMG does not seem to have any listed, you can also put a want out in the SS classified but you have to be a supporting member (everyone should it's a great forum!)
You need to get the numbers off of your pump to match what injector you want
- 6,930
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- Papalote, TX
Or you can pop it out and have your local diesel injection shop look at it if you have one.
Seco lists the same injector for both the 6.2 and 6.5L NA engine
Seco lists the same injector for both the 6.2 and 6.5L NA engine
blutow
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If the motor runs better without fuel to that cylinder, it seems like it might be a problem with the cylinder rather than the injector. Did the smoking stop when you cracked the line? I’d consider swapping injectors with another cylinder and repeat the test. If the problem moves to the other cylinder, good chance it’s the injector. It it stays with the original cylinder, it’s something unrelated to the injector.