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  #1  
Old 06-12-2008, 06:26 PM
BenzB0y's Avatar
BLUE BEAST
 
Join Date: Sep 2007
Location: Portsmouth, Va
Posts: 129
Exclamation 300SDL 1987, Acceleration issue....

After driving around today, I really feel like the car is stuck in 4th gear, if possible... Is there anyway the car is stuck in limp mode where it wouldn't take off in 1st or 2nd? I never even feel the car shifting gears, (no shift shock at all, just surges). The only gear change I feel is when it slams through the 1-2 or maybe some other gear ratio 2-4???? I don't know if a bad flex disc would make the gears slip badly, or once again maybe the thought of the transmission governor who nobody wants to talk about.

Maybe a bad shift linkage?? Who knows? I think its going to get to the point where it gets stuck in 1st gear, and I have to get the transmission fluid and filter changed to keep driving. It's already happened three times... twice because the modulator wasn't installed properly first time, and probably did internal damage maybe???

Does this sound like a problem someone could diagnose, or does it even make any sense?

Thanks for replys and suggestions!

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  #2  
Old 06-12-2008, 07:08 PM
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Join Date: Aug 2005
Location: Buford, GA
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check all of your vacuum lines. They might have a split end, be off the connector, etc., especially the one mounted on the driver's side wheel well top, in the engine compartment.
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  #3  
Old 06-12-2008, 09:09 PM
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Location: Canterbury CT
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I have felt this similar situation, and I found the vac line to the air box disconnected. I plugged it in and it was back to silky smooth.
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  #4  
Old 06-12-2008, 11:45 PM
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It is only a 4 speed transmission.
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  #5  
Old 06-13-2008, 12:22 AM
Registered Hack
 
Join Date: Mar 2008
Posts: 4,642
i agree.. check vacuum lines everywhere.

have you recently serviced the trans in any way?

had a gasser that did the very same thing after changing fluid

what level of computer control is there on the 87?
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  #6  
Old 06-18-2008, 08:07 PM
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Join Date: Sep 2007
Location: Portsmouth, Va
Posts: 129
Question

Which vacuum line goes to the airbox? And what color is the hose that goes to the drivers side wheel top in the engine compartment? How do they affect the transmission shift and power?

I added a little bit of transmission fluid and that seemed to help a little bit. Also when I was on the interstate today, I could hear the turbo spinning through the dash.

I have no idea about the level computer, if any, seems like all the older diesels used the extra vacuum and boost for the transmission....

Thank YOU!

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Thanks for advice, replys, and suggestions!

1987 300SDL Turbo 308,000 miles
"seen better days"
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