surging only at cruise speed

[redfox97]

My '95 is surging only at cruise, whether it is 40,50,or 60. It idles fine and accelerates fine. I changed plus,wires,air filter. I am lost. Any help?

 

[redfox97]

Anyone?? I've searched but the ones I have found were usually having problems at idle or accelerating. Like I said mine is only at speed, it runs fine all other times. thanks

 

[Creager]

Fuel filter could be clogged.

You might want to actually test for spark and fuel. It could be a damaged coil pack or fuel pump or something. Fuel pressure regulator even, you gotta start eliminating the possibilties

 

[budwich]

check to make sure all your linkages are free and not binding in any form. Also check to make sure brackets associated with speed control stuff are not loose. I am not sure if 95 speed control is vacuum associated or electronic (my 96 is electronic). If it is vacuum based, it sound like perhaps you have a vacuum leak somewhere. If its electronic, check the VSS resistance ( that the circuit used to determine the speed of the vehicle).... but it would likely show a "fluctation" (bouncing / drifting) during normal driving. Your speed control servo might be having problems. You could try replacing it (I don't know how much they cost but it probably ain't cheap). Lastly, I suspect it is a faulty switch in your steering column.... ie. the set/accel switch.

 

[redfox97]

budwich it's not actually a problem while using the cruise control(although it does it then also). It does it when I level the speed off. It sat a couple days while I was out of town and is now doing it just every now and then. I'm thinking maybe bad gas. I reated the gas added fresh gas and I'm going to change the filter also. I'll see what happens. thanks

 

[budwich]

oops, i misread your post... sorry. Actually, it looks perhaps like a fuel problem. However, troubleshooting charts also point at the MAF sensor for surge/bucking under cruise / accelaration.

 

[Runnin'OnEmpty]

troubleshooting charts also point at the MAF sensor for surge/bucking under cruise / accelaration.

That would be my first guess too. Maybe clean the MAF first, and see if that has any effect.....