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#1
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240d misfire at idle
hi all,
1983 eurospec 240d. 113k miles. auto. When i got the car, it would start right up but stall without being given throttle. Idled really low and misfired. Thus far I have changed the hand primer pump to the new bosch style (old one was leaking), changed the idle on the back of the injection pump to bring it to an acceptable range, adjusted the valves, changed out both fuel filters. After all of the above, the car would start right up without stalling out. However, still had a rough idle with random misfire (but better than before). When in gear and stationary, the rough idle and misfire almost disappear. When driving around at speed, the misfire is nowhere to be found. I'm at a loss at to what to try next, ideas? Thanks |
#2
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Cold or hot, or both?
Make sure that your not getting air in the fuel lines. If its not air its most likely the fuel injectors, pull them out and have a diesel injection shop check and rebuild them if needed.
__________________
1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#3
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both hot and cold, maybe a bit more when it's cold.
next step will be to replace the supply lines. the ones from the primer pump to the screw on fuel filter and from that filter to the IP. can those lines be bought at any auto parts store? If that doesn't work i have another friend with a 300d and i'll try swapping in his injectors to see if that solves the problem. any other ideas? thanks! |
#4
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btw there is a bubble of air in the clear filter, i'm assuming that's normal? no little bubbles fizzing or anything though.
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#5
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1 large bubble is fine in the filter.
No need to replace the hard plasitc lines unless they are broke. Replace the rubber fuel line with 5/16 fuel rated hose.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#6
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Hmmm
Answer
Valve adjustment OM615, 616, 617 FYI. http://www.peachparts.com/shopforum/showthread.php?t=107729 * Air entering the fuel system/contaminated fuel, partially plugged filters. Fuel Delivery: http://www.peachparts.com/shopforum/showthread.php?t=142399 * Diesel Injector issue. Injector + Heat shield + Nozzle, Prechamber + Collar and Nailing. LINK THREAD http://www.peachparts.com/shopforum/showthread.php?t=211750 * Diesel Injection Pump Timing issue. Diesel Injection: http://www.peachparts.com/shopforum/showthread.php?t=142405 * Fuel pressure relief valve, and/or the lift pump valvae are bad. Fastlane: REBUILD KIT, DIESEL LIFT PUMP/FUEL PUMP, DOES NOT INCLUDE THE LARGE PLUNGER SPRING OR LARGE PLUNGER COVER SEAL RING, APPLICATION: OM616.912, OM617, 910, 912, 950, 951, 952 http://catalog.peachparts.com/item.wws?sku=0000900210 pictures on install are here. OM617.951 and .952 Lift pump Repair kit W126.120 300SD W123.133 300D http://www.peachparts.com/shopforum/showthread.php?p=1461282 Fuel injection pump starvation with good a good lift pump http://www.peachparts.com/shopforum/showthread.php?p=2133911 Fuel pressure relief valve adjustment http://www.peachparts.com/shopforum/showthread.php?t=234609 lift pump test http://www.peachparts.com/shopforum/showthread.php?t=277893 fuel pressure http://www.peachparts.com/shopforum/showthread.php?p=2156755 Last edited by whunter; 08-25-2010 at 01:58 AM. |
#7
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Have you checked compression? If you've got a low cylinder (typically #1) it will miss when cold and at idle, yet often be fine at road speed.
Kurt
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- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride! - '86 190D (W201-126) - 2.5 NA engine, 5 speed, cloth interior, manual climate controls, 33-34 mpg (sold to forum member). |
#8
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Quote:
I will make a slight different comment about what happens on the highway... It may feel fine but if you are low on compression on a cylinder it will be making less power it is just not as noticable as at idle.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#9
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I doubt that it is an air leak. Usually air leaks get worse when you try to drive, because you start pulling more air into the system. I'd start with a valve adjustment. You could have valves that are way out of adjustment. On these cars as the valve clearances get out of adjustment the clearances tighten up, which causes the valves to not close all the way which causes compression to go down. I'd adjust the valves and then run a couple cans of diesel purge through the fuel system and see what happens.
You can also loosen the hard lines ones at a time to each injector, with the engine running. The engine should run rougher when you crack open a line. If you find one that doesn't change the idle as much as the others or at all you've found the culprit cylinder. This points to injector or compression. But I'd do the valve adjustment and diesel purge first. Also you should adjust the valves before you do a compression test due to the reason I stated above. Mis-adjusted valves with lower compression, and give you a false reading.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#10
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went out and bought the harbor freight tools diesel compression tester tonight. with all 4 glow plugs removed and the engine cold, tested compression through the glow plug holes. all 4 cylinders read right around 450. from what i have read, new spec was 425ish? any ideas? at any rate the compression seems to not be the issue? so most likely an injector issue?
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#11
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I agree with adjusting that valves if they are due. Tight valves will cause a miss, both hot and cold.
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#12
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Living a similar problem on my '83 Euro 240d, manual. Misses a little when cold, but fine when warm. Haven't done valves yet, but believe this is most likely it. Previous owner said he did a valve adjust, but you can't do too many...
All new filters, lines look good. Watching with interest.
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05 E320 CDI 99 SL500 02 530i 82 240D SOLD 83 240D Euro 4spd SOLD 86 300D Euro Auto SOLD |
#13
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hi-let me know out come please have a simular situation , hot/cold but great on hy,way
me thinks at idle injectors / i.p one has low pressure , higher rpm higher pressure , using infared thermometer 2&5 not as hot as others got 2 new injecters on the way,bought 5 supposed to be cleaned , ugh. u never know , any body agree with my assumption |
#14
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Adjusting the valves has been recomended several times. Is there some reason you want to skip this simple and free repair. If the valves are out of adjustment, no amount of diagnostics will solve the problem. You might get lucky by replacing the injectors, or the timing chain, or the injection pump, ect. However you could go on throwing money and parts at the misfire, and never find the real source of the problem. Adjusting the valves was suggested by some of the more knowledgeable members of this site.
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#15
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When cold are you using the high idle control knob prior to starting?
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1981 300TD 4 speed manual Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light |
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