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Old 02-05-2010, 08:08 AM   #1 (permalink)
4320Diesel
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Cruise Control Test.

my vacuum pump is dead on account that the PO unhooked the EGR and capped the hose going to the EGR valve but left the other side open so the vacuum pump could suck in whatever it felt like so its toast. since my truck doesnt have A/C or a TH400 and the emissions trash is unhooked the only reason for the vacuum pump is the cruise control. ive heard these things tend to die after a while so i was wondering if there was a test so i could see if the system in my truck actually worked before i bought another vacuum pump and then found out this didnt work anyways.

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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1998 Dodge Ram 2500 Sport club cab short box 4WD 5 speed 12 Valve cummins. Brentbilt fuel plate. 300 horse motorhome injectors, boost elbow, timing bumped to 18* autometer boost and pyro, 500 horse valair clutch waiting to go in!
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your wrong brent, i'll think of a reason later

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Originally Posted by diaric View Post
brent can't do that, it would look factory, lol

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Brent is right.
Was there any ever doubt?
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Old 02-05-2010, 11:31 AM   #2 (permalink)
Trios
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I can give you the test procedure from my service manual when I get home. You'll need around 8 PSI of vacuum to test it with tho.

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Trios is right.
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x2 Trios is right lol

Last edited by Trios; 02-05-2010 at 11:34 AM.
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Old 02-05-2010, 11:55 AM   #3 (permalink)
Jodean
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if you put your finger over the vacuum port when the diaphram is pushed it, if it holds, it works, if it leaks down and the diaphram comes all the way back its shot. At least you can test that. Most of them are shot and new ones are $100's
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Old 02-05-2010, 07:19 PM   #4 (permalink)
4320Diesel
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i can squeeze the diaphram all the way up and i hear air hiss but both lines are hooked onto it. ill try putting my finger on the vacuum port.
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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1998 Dodge Ram 2500 Sport club cab short box 4WD 5 speed 12 Valve cummins. Brentbilt fuel plate. 300 horse motorhome injectors, boost elbow, timing bumped to 18* autometer boost and pyro, 500 horse valair clutch waiting to go in!
Quote:
Originally Posted by diaric View Post
your wrong brent, i'll think of a reason later

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brent can't do that, it would look factory, lol

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Brent is right.
Was there any ever doubt?
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Old 02-05-2010, 07:27 PM   #5 (permalink)
Max Power
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this is an 85? That 85 has the newer style servo. It will still leak back even if you plug the holes. There is no simple way to test them without the kent moore tester. I have the tester if you ever go through Manitoba. I can test it on or off the truck. In fact we used to rebuild thousands of these for 100's of gm dealers across Canada. We still have all the equipement etc but almost no one wants these rebuilt any more because of their age.

The servos used on the 6.2's were specific to the 6.2's and they are almost always wore right out because they were mounted on the engine and they were vibrated to pieces. Some FWD cars used an almost identicle servo except it had 6 holes instead of 4 for the throttle pull. You could cut off the top 2 holes and it would work find on the 6.2. They are identicle other then the throttle connection. You could try to pick one up from a wrecker. Don't bother getting one off of another 6.2 it will be worn out as well.



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Last edited by Max Power; 02-05-2010 at 07:30 PM.
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Old 02-05-2010, 07:33 PM   #6 (permalink)
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so this one will probably be toast i suppose. my mom has a 1989 delta 88 oldsmobile and i noticed the cruise servo looks exactly the same *evil* she wont miss it untill it doesnt work when she wants it to. i guess i could also hook this one up to her car and see if it works.
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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1998 Dodge Ram 2500 Sport club cab short box 4WD 5 speed 12 Valve cummins. Brentbilt fuel plate. 300 horse motorhome injectors, boost elbow, timing bumped to 18* autometer boost and pyro, 500 horse valair clutch waiting to go in!
Quote:
Originally Posted by diaric View Post
your wrong brent, i'll think of a reason later

Quote:
Originally Posted by diaric View Post
brent can't do that, it would look factory, lol

Quote:
Originally Posted by Trios View Post
Brent is right.
Was there any ever doubt?
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Old 02-05-2010, 07:34 PM   #7 (permalink)
Max Power
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Actually I have litterly hundreds of cores here for the FWD cars. I don't many of the original 6.2 ones. If you need one let me know I can rebuild one for you.



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Old 02-05-2010, 07:35 PM   #8 (permalink)
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Quote:
Originally Posted by 4320diesel View Post
so this one will probably be toast i suppose. my mom has a 1989 delta 88 oldsmobile and i noticed the cruise servo looks exactly the same *evil* she wont miss it untill it doesnt work when she wants it to. i guess i could also hook this one up to her car and see if it works.
Yes that one would be identicle except 6 holes instead of 4. You might have to cut off the top 2 holes to get enough adjustment out of it. Most of the 3.8L's used that servo up until early to mid 90's.



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2011 GMC 2500HD Denali CCSB, DVD, Nav, Sunroof etc..... Mods to come

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2009 GMC Crew Cab, Short Box SLT LMM - Sold
04.5 GMC 2500HD LLY Carbon Metallic - Sold
2003 GMC 2500HD LB7 White - Sold
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Old 02-05-2010, 07:36 PM   #9 (permalink)
4320Diesel
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will do thank you! if the car was here i would go look at it to see if the plug and hoses were the same. itd be nice since then i could test it before i shell out some cash.
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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1998 Dodge Ram 2500 Sport club cab short box 4WD 5 speed 12 Valve cummins. Brentbilt fuel plate. 300 horse motorhome injectors, boost elbow, timing bumped to 18* autometer boost and pyro, 500 horse valair clutch waiting to go in!
Quote:
Originally Posted by diaric View Post
your wrong brent, i'll think of a reason later

Quote:
Originally Posted by diaric View Post
brent can't do that, it would look factory, lol

Quote:
Originally Posted by Trios View Post
Brent is right.
Was there any ever doubt?
Offline   Reply With Quote Quick reply to this message
Old 02-05-2010, 07:36 PM   #10 (permalink)
4320Diesel
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nevermind the last post

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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1998 Dodge Ram 2500 Sport club cab short box 4WD 5 speed 12 Valve cummins. Brentbilt fuel plate. 300 horse motorhome injectors, boost elbow, timing bumped to 18* autometer boost and pyro, 500 horse valair clutch waiting to go in!
Quote:
Originally Posted by diaric View Post
your wrong brent, i'll think of a reason later

Quote:
Originally Posted by diaric View Post
brent can't do that, it would look factory, lol

Quote:
Originally Posted by Trios View Post
Brent is right.
Was there any ever doubt?
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