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SL/R129: 1991 500sl running issues

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Old 07-05-2022, 01:45 PM
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2007 SL65, 2009 SL550, 1991 SL500
1991 500sl running issues
i have a 91 sl. Will start just fine when cold but when warmed up runs like poop. If I shut it off it will not start until it is cold again. Any ideas of what is going on?
Thanks
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Old 07-05-2022, 08:03 PM
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06' Audi Quattro, 00'SL500
Does it have a lot of miles on it? Maybe original fuel pump, filter and spark plugs still in it. It could use a fuel bath like 33k B&G fuel systems cleaner, it helps clean injectors about 30.00 a can. And it could be your fuel injector pressure regulator.
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Old 07-07-2022, 12:29 PM
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2018 E300 4Matic Sport
Originally Posted by BenzBopper
Does it have a lot of miles on it? Maybe original fuel pump, filter and spark plugs still in it. It could use a fuel bath like 33k B&G fuel systems cleaner, it helps clean injectors about 30.00 a can. And it could be your fuel injector pressure regulator.
BenzBopper -- how often do you use the B&G fuel system cleaner? Easy to use? Thanks in advance!
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Old 07-07-2022, 04:12 PM
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2007 SL65, 2009 SL550, 1991 SL500
Originally Posted by BenzBopper
Does it have a lot of miles on it? Maybe original fuel pump, filter and spark plugs still in it. It could use a fuel bath like 33k B&G fuel systems cleaner, it helps clean injectors about 30.00 a can. And it could be your fuel injector pressure regulator.
113k miles
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Old 07-08-2022, 11:11 PM
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06' Audi Quattro, 00'SL500
Originally Posted by BoMB
BenzBopper -- how often do you use the B&G fuel system cleaner? Easy to use? Thanks in advance!
Its easy to use. Make sure your wearing gloves and safety glasses.I think that cleaner is really potent and might absorb through your skin,just use caution. Pour a can to a full tank of fuel with a funnel. You should a difference after a 10 mile drive.
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Old 07-09-2022, 08:28 AM
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2018 E300 4Matic Sport
Originally Posted by BenzBopper
Its easy to use. Make sure your wearing gloves and safety glasses.I think that cleaner is really potent and might absorb through your skin,just use caution. Pour a can to a full tank of fuel with a funnel. You should a difference after a 10 mile drive.
Got it, thanks. How often are you using it? Every tank? Every other? Once a month? Six? Thanks again.
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Old 07-09-2022, 11:18 PM
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06' Audi Quattro, 00'SL500
Originally Posted by BoMB
Got it, thanks. How often are you using it? Every tank? Every other? Once a month? Six? Thanks again.
about every 40k miles.
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Old 07-10-2022, 12:29 AM
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2018 E300 4Matic Sport
Originally Posted by BenzBopper
about every 40k miles.
Got it...thanks again!!! Even I can buy something and pour it into the gas tank! LOL.
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Old 07-10-2022, 11:46 AM
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SL500
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Search for BG44K.
I use it once a year in each car I own.
I've had best results when I add it right before a long drive when I use at least half a tank of fuel.
The stuff's amazing IMHO. YMMV.
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