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94 Jeep Grand cruise


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grafxpro 
Member - Posts: 4
Member spacespace
Joined: September 12, 2004
Location: United States
Posted: April 18, 2005 at 12:46 PM / IP Logged  

I have a 94 Jeep Grand Cherokee Limited withe the 5.2 L, Auto, and it have developed a problem with the cruise control. I can set the speed and it will work, but after a few min. it will start to pluse in speed.  It will slow down from the set speed and drop a few MPH then it will speed back up to the set speed. It will keep slowing down and speed up and the diffrence between slowing down and speeding up will get farther apart. What should I look for? Any Ideas?

Thanks in advance

Thank's For All.......
mo12v 
Platinum - Nominee - Posts: 2,748
Platinum - Nominee spaceThis member consistently provides reliable informationspace
Joined: September 30, 2003
Location: Afghanistan
Posted: April 18, 2005 at 9:30 PM / IP Logged  

Check Cruise Cable Slack............No more than 1/4 inch

Does Speedo jump also?
Make sure U have NO Vacuum leaks

MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
grafxpro 
Member - Posts: 4
Member spacespace
Joined: September 12, 2004
Location: United States
Posted: April 20, 2005 at 3:53 PM / IP Logged  
mo12v wrote:

Check Cruise Cable Slack............No more than 1/4 inch

Does Speedo jump also?
Make sure U have NO Vacuum leaks

Checked the slack and its ok.

No the speedo does not jump but the tach shows the slowing down and speeding up

Checked all of the lines and thay look good

Today it started to do its thing right from the start, could it be the controler?

Thank's For All.......
airandsound 
Copper - Posts: 69
Copper spacespace
Joined: December 16, 2002
Location: United States
Posted: May 11, 2005 at 10:13 AM / IP Logged  
vacuum servo cruise?
Most likely one or more of the vacuum solenoids that allow vacuum through or bleed it off are sealing too well.
There is probably a small amount of oil on the plunger that keeps to sealed while the spring hasn'r enough pull to break that seal quickly.
so take it apart, wipe it off and reassemble.

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