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  #1  
Old 08-23-2007, 12:14 PM
meltedpanda's Avatar
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Join Date: Mar 2003
Location: Central Ky
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I have looked but... Most common reason for acceleration miss -450SL

Seems to be varrious factors that make the Djet system want to miss. Mine is a bit perplexing. It seems it only occurs after I first start and only the first few accelerations, then is dissapears and may reappear at random intervals. It almost always is there on start up , hot or cold. Seems to be fuel delivery related but sometimes she just purrs and comes off the stop like a rocket, other times, not so good, I am currently running some injector cleaner through it, as this car was not driven much over the last few years.
Ideas, suggestions
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2011 Porsche Cayman - Bond,James Bond
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72 450SL, Pearl-SOLD
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  #2  
Old 08-23-2007, 09:35 PM
meltedpanda's Avatar
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Would running rich be a cause, timing?
What about injectors, seems likely, I can't be the only one with this issue can I ............
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Ron
2011 Porsche Cayman - Bond,James Bond
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #3  
Old 08-26-2007, 04:00 PM
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Location: Napa Valley
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How long has it been since the fuel filter was changed? That is generally the first place I look.
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  #4  
Old 08-26-2007, 09:03 PM
meltedpanda's Avatar
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I just changed it but I am on the second full tank of gas this car has had in the last 12 months or so, I am using some additives to get rid of any gunk, could that also give me these symptoms?
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Ron
2011 Porsche Cayman - Bond,James Bond
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #5  
Old 08-26-2007, 10:06 PM
88Black560SL
 
Join Date: Oct 2004
Location: NC
Posts: 2,989
Generally for misfires under load, like in your case, I look to ignition. A good scope test will rule out your ignition right away. Since you probably dont have a scope, how old are your plugs, wires cap etc. Plugs are the only thing I would consider replacing as a shot gun approach. Wires and cap are very expensive and should last along time, a real long long time but your car is very old.

Fuel system is a posibility, that is why I wouldent go down the path as so many have in replacing a bunch of parts.

John Roncallo
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  #6  
Old 08-27-2007, 10:32 AM
meltedpanda's Avatar
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cap, points,, condensor all new, trigger points cleaned.
Wires were not changed but look great, I regapped plugs as PO said they were new, they are the NKG most suggest.
I am still leaning to fuel delivery, this morning it ran like a champ, no misses, it was cooler out so don't know if that is a factor.
Should I use a different plug? I have thought about that - cooler, hotter?

Thanks for the advice.
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Ron
2011 Porsche Cayman - Bond,James Bond
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #7  
Old 08-27-2007, 12:59 PM
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Join Date: Aug 2005
Location: Napa Valley
Posts: 349
I can highly recommend "How to tune and modify Bosch Fuel Injection" by Ben Watson. Step by step procedures for testing every component. I know it's available thru Amazon.
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