Stumble & Hesitate

Zerokool · 02-24-2012, 03:37 PM

Hi, I have 1991 300sl. The car stumbles and hesitates off the line, very annoying. Everybody I speak to, has a different answer. Has NEW plugs, wires , cap, rotor. Check all hoses, dosent seem to have any vacum leaks. Crack open each fuel line on fuel Distributor , all lines seem to be flowing fine.

Appreciate any advice,

Thanks Drew

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grays · 03-09-2012, 12:52 AM

maybe egr valve

boulevardier · 03-25-2012, 09:21 PM

Drew - I have a 1991 300sl with the same problem. it is intermittent and seems to be worse when the car is restarted when hot. I share your frustration because I have also checked various forums and there seems to be no clear-cut answer. My indy feels that it is due to tired injectors (the car has 175xxx miles). He changed one injector (the one he felt was the worst) and there was some improvement. Guess I'll try replacing the other five. Let me know if you come up with anything!

cdrusn · 04-01-2012, 03:45 PM

I had exactly the same problem. Sometimes it felt like the car was going to stall after starting out from a stop sign. I changed all the plugs, no improvement. I looked at the top of the intake manifold with the air cleaner off and 2 vacuum hoses were off. Put them back on and car ran perfect. A few weeks later, same problem. Looked at the front of the engine and another vacuum hose had pulled off. Even if your vacuum hoses look connected they could also have pulled off at the other end so you might want to trace them to their final point or also you could deliberately pull them off one at a time to see if the engine bogs down then you would know they are connected.

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03-09-2012, 12:52 AM	#2
grays Senior Member Garage is empty, add now Join Date: Oct 2011 Location: longisland newyork Posts: 471 Drives: 1995 SL320	maybe egr valve

03-25-2012, 09:21 PM	#3
boulevardier Newbie Garage is empty, add now Join Date: Mar 2012 Posts: 1 Drives: 1991 mb 300sl	Drew - I have a 1991 300sl with the same problem. it is intermittent and seems to be worse when the car is restarted when hot. I share your frustration because I have also checked various forums and there seems to be no clear-cut answer. My indy feels that it is due to tired injectors (the car has 175xxx miles). He changed one injector (the one he felt was the worst) and there was some improvement. Guess I'll try replacing the other five. Let me know if you come up with anything!

04-01-2012, 03:45 PM	#4
cdrusn Newbie Garage is empty, add now Join Date: Apr 2012 Location: Ewa Beach, Hawaii Posts: 6 Drives: 1992 500sl	I had exactly the same problem. Sometimes it felt like the car was going to stall after starting out from a stop sign. I changed all the plugs, no improvement. I looked at the top of the intake manifold with the air cleaner off and 2 vacuum hoses were off. Put them back on and car ran perfect. A few weeks later, same problem. Looked at the front of the engine and another vacuum hose had pulled off. Even if your vacuum hoses look connected they could also have pulled off at the other end so you might want to trace them to their final point or also you could deliberately pull them off one at a time to see if the engine bogs down then you would know they are connected.

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