#11
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The strange thing is all these plugs were within spec for resistance (identical to brand new duraterms) but clearly the quality or design is inferior. They were $4 a pop wholesaler discount from rockauto, so I got what I paid for. Good thing I didn't buy an extra set
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1985 744 D24T M46 49mm t3 @20psi 280k |
#12
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One more observation was that the car doesn't want to start right away when warm. It started faster when cold. The GPs didn't cycle. Indicator of low-ish compression? I lost the quote, but somewhere in this thread or another a member said that in good condition the car should start immediately on the first spin of the starter. Now I can't settle for anything less At it's fastest, it's still the 2nd or 3rd crank. Maybe that's an indicator of lowish compression as well, although I suppose it could be any number of things in the fuel system. How fast do your cars start up?
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1985 744 D24T M46 49mm t3 @20psi 280k |
#13
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1985 744 gle d24t 1985 745 gle d24t |
#14
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Mine always starts faster and smoother as long as The temperature in the engine is high enough that the glow plugs are not needed.
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99 Ram 2500 24V Cummins 199k 85 745 TD M46 170k (silver) 85 745 TD M46 251k (white) Holset HY35, 4" turbo back, n/a intake manifold, intercooled, GTD nozzles set to 2400psi @18psi. super pumped 86 745 TD auto 254k sold Several other current gasser Volvos. 67 122S 72k (barn find) 89 760 TIC for sale non running. 93 850 5spd 396K. 94 850 Turbo (race car) 12.55@112.4 95 850 T-5R wagon yellow 199k 04 V70R Titanium/Atacama M66 245k 04 S60 2.5T awd 255k 06 XC90 V8 305k |
#15
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Cold starts have been much better since new GPs, but yesterday it ran a little rough after starting. It had snowed overnight and gotten into low double digit temps, so I attributed it to that. This morning it started well after only one cycle, but quickly started to run rough, bouncing rpms, similar to before with bad GPs. I wonder if there is some issue with my control unit that is making the GPs wear out really fast, or if it's just the colder than usual temps. Odd that it initially starts fine they quickly runs crappy. I haven't made any changes to the car except driving it a little harder than usual up some hilly areas. It's supposed to be cold all week so I'll see if the issue stays the same or gets worse.
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1985 744 D24T M46 49mm t3 @20psi 280k |
#16
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Is the cold start waxstat functioning? Is the cold start lever and ball set correctly?
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1985 744 gle d24t 1985 745 gle d24t |
#17
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The waxstat looks to be functioning, there is much tension on the cable when the car is cold (hard to disengage CS for setting timing) and when warm it is relaxed. I believe there is a procedure to test precisely but this seems adequate.
I'm not sure what you mean by cold start lever. Do you mean the lever on the pump? I haven't touched that. The ball stud has been moved around a few times, I need to get that fine tuned. The odd thing is that my cold start RPMs start lower and raise in the first minutes of driving. Then when the car is hot, they drop back down. Usually I just keep them up with my foot until the idle clears up. I tested the entire GP system and everything works exactly as it should. I didn't realize that in certain temps the controller keeps the plugs on for a few moments after the indicator light goes off. I have yet to test it, but my theory is in very cold temps the controller isn't holding them on long enough. That's why it starts strong, then takes a dump after a moment or two. Will have to get out the test light one morning. Not really my cup of tea first thing in the cold but only way to be sure. Also lost 1st and 2nd gear right before the snowstorm here in NY, the bushings at the bottom of the shifter rod were missing and broken. In a pinch cut up some 240 endlinks I had in the scrap bin to make solid bushings
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1985 744 D24T M46 49mm t3 @20psi 280k |
#18
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The cold start mechanism does two things:
1. Pulls a lever that internally advances low-rpm IP timing 2. The same lever has a ball stud (item #2 in this diagram) that nudges open the IP's "throttle" lever slightly off its normal resting position on the idle speed set screw. So you get smoother idle when cold, as well as higher idle. Check the IP throttle lever position at idle when warmed up. It should be resting on the idle set screw. Compare that to its position when cold. When cold, you should see the same throttle lever several mm away from the idle speed set screw. (Correlating to approx. 1100-1200 rpm.) Note how the ball stud on the CS lever is pulling the throttle lever open. You can adjust that ball stud on its slot mount for higher cold idle speed. NOTE: The cold start lever is extremely hard to manipulate by hand while the engine is not running (i.e. IP is not spinning.) HERE is a great CS troubleshooting checklist. Highly suggested you follow it. Here are a couple of forum threads on the subject. There are more. d24t.com/showthread.php?t=822 d24t.com/showthread.php?t=1201
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1985 744 gle d24t 1985 745 gle d24t |
#19
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Thanks for the link. Unfortunately I don't see any green dash in the pic (colorblindness or it's just unclear), so I'm not sure about the arm resting on the pump body. My cold idle was around 1000 so I bumped it up to 1200 by adjusting the ball stud. I'll see how it starts tomorrow after sitting overnight with corrected CS idle. When warm it idles right at 900.
I don't have a pic of the pump with CS connected in front of me right now, but it seems to me that if the ball stud was adjusted to be too far away from the throttle tab (as it was in my case) then the CS lever on the pump would be allowed to move more and advance timing excessively (?). Maybe that can affect cold starting as well.
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1985 744 D24T M46 49mm t3 @20psi 280k |
#20
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Green dash? sorry, you lost me there.
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Many have found, that for a reasonably sound engine, that the CS mechanism is not required for starting, at least for temps down into the teens F. Might take marginally more cranking, and a few more seconds of rough running, but will start relatively quickly w/o the CS. We're talking an engine with decent compression, good cranking speed, and all 6 functioning GPs.
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1985 744 gle d24t 1985 745 gle d24t |
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