1989 K5 Blazer, Cruise control surging - The 1947 - Present Chevrolet & GMC Truck Message Board Network

baclay9 · 05-01-2011, 01:22 PM

We have been trying to figure out the cruise control surge on my buddies K5. When you set the cruise at any speed you can feel the power surging. We thought maybe it was the speedo because the needle was jumping a little but we changed it and it still does it.

The surge isn't drastic but you can feel it. Thanks for any suggestions.

Liddy71 · 05-01-2011, 02:13 PM

cable driven it may need lube

baclay9 · 05-01-2011, 02:40 PM

cable driven? I thought it worked off of the little "laser" that gets bolted to the back of the speedo.

Liddy71 · 05-01-2011, 06:10 PM

Iam not sure what year but some use to have the speed cable come up from the trans to a box on the inter fender then a cable from it to the cluster

tobiahr · 05-02-2011, 01:28 AM

it could also be a vacuum leak effecting the actuator attached to the throttle at the carb

baclay9 · 05-02-2011, 07:05 AM

Quote:

Originally Posted by tobiahr

it could also be a vacuum leak effecting the actuator attached to the throttle at the carb

We were actually thinking maybe that was it. He bought some vaccumm line yesterday and we are going to try changing some of it today and see iff we can track a leak down.

Jonboy · 05-02-2011, 11:46 AM

It may also be a leak in the diaphragm of teh servo. Check it with a vacuum pump to see if it holds.

*78 Chevyrado* · 05-02-2011, 02:07 PM

My 87 used to do that, so I ended up taking the actuator apart to see what was wrong. I didn't find anything damaged so i cleaned it and closed it back up and then it worked fine. Musta just had a bad seal or something.

05-01-2011, 01:22 PM	#1
baclay9 Registered User Join Date: Apr 2010 Location: Newcastle, OK Posts: 1,344	1989 K5 Blazer, Cruise control surging We have been trying to figure out the cruise control surge on my buddies K5. When you set the cruise at any speed you can feel the power surging. We thought maybe it was the speedo because the needle was jumping a little but we changed it and it still does it. The surge isn't drastic but you can feel it. Thanks for any suggestions.

05-01-2011, 02:13 PM	#2
Liddy71 Registered User Join Date: May 2010 Location: Kenova, WV Posts: 821	Re: 1989 K5 Blazer, Cruise control surging cable driven it may need lube

05-01-2011, 02:40 PM	#3
baclay9 Registered User Join Date: Apr 2010 Location: Newcastle, OK Posts: 1,344	Re: 1989 K5 Blazer, Cruise control surging cable driven? I thought it worked off of the little "laser" that gets bolted to the back of the speedo.

05-01-2011, 06:10 PM	#4
Liddy71 Registered User Join Date: May 2010 Location: Kenova, WV Posts: 821	Re: 1989 K5 Blazer, Cruise control surging Iam not sure what year but some use to have the speed cable come up from the trans to a box on the inter fender then a cable from it to the cluster

05-02-2011, 01:28 AM	#5
tobiahr Registered User Join Date: Nov 2007 Location: Lincoln NE Posts: 513	Re: 1989 K5 Blazer, Cruise control surging it could also be a vacuum leak effecting the actuator attached to the throttle at the carb

05-02-2011, 11:46 AM	#7
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: 1989 K5 Blazer, Cruise control surging It may also be a leak in the diaphragm of teh servo. Check it with a vacuum pump to see if it holds. __________________ 1974 Jimmy- 5.3/4L80e/NP241

05-02-2011, 02:07 PM	#8
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: 1989 K5 Blazer, Cruise control surging My 87 used to do that, so I ended up taking the actuator apart to see what was wrong. I didn't find anything damaged so i cleaned it and closed it back up and then it worked fine. Musta just had a bad seal or something.



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