jandb150

I'm wondering if anyone has had this issue and figured out what causes it. If you are driving along 50-60 mph and coasting but applying light throttle you can feel the car "surge" or slightly "bucking" If you apply more throttle it accelerates through the issue. If you slow down enough you get the same result. No CE light and car otherwise drives fine. I have replaced damn near every vacuum line near the Air cleaner box,the switch over valves near the injection pump. basically all the easy stuff. Any suggestions would be appreciated.

kajtek1

What engine?
If that is NA OM606, they have known problem with engine surging due the intake flaps.

jandb150

606.912 motor
07/1996

Plutoe

What happens, if anything when you have the cruise control engaged.

jandb150

To be honest I do not drive the car every day my daughter does I will have to have her try that and see . My plan is to check the resonance flap in the intake tomorrow I have checked the one on the crossover pipe and it functions properly. Out of curiosity if it does it with the cruise control on or if it does not what does that suggest?

Plutoe

So you arn't the driver and all this is second hand. Why don't you drive the car and advise if you are able to duplicate the issue!

jandb150

I know exactly what it’s doing and has done because it has done it to me on the past. Just not as frequent. It’s gotten worse in the past two , three days. Where before it would do it once a month maybe two. The symptom is the symptom irregardless if I drive the car daily or not.

flynavy987

Long time reader, first time poster.

Any resolution to this issue? I’m having exactly the same symptoms as the OP. I’ve checked and replaced all suspicious vacuum hoses.

I cant seem to find any other posts regarding a solution.

Thanks for the help everyone!