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#1 |
What I drive
Join Date: Apr 2004
Location: Star, MS
Posts: 418
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Looking to buy a 85 Crew cab...need opinions and help
Found an 85 crew cab today, didn't really notice if it was a 1ton or 3/4 ton. It has the 454 with th400 setup. I drove it and here is where help and opinions are needed. It seemed as if it was missing and actually backfired thru the exhaust when I got on it and when I was parked and revved the engine up.....could needing a tuneup cause this or could it be more serious as in burnt valves? Also noticed a problem with the tranny when I drove it. I pulled out of the lot and it took a long time to shift and when it did, boy did it shift!
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1986 Chevy Crew Cab Dually(Choo-Choo Conversion) 2006 Chevy Equinox |
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#2 |
Registered User
Join Date: Sep 2004
Location: Pierre SD
Posts: 1,533
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Low engine vacuum could cause the delayed shifts. Low vacuum could be caused by a variety of problems, including serious engine damage. See if you can you have it checked out by yourself or a mechanic before you make a final decision.
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#3 |
What I drive
Join Date: Apr 2004
Location: Star, MS
Posts: 418
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I have a vacuum guage and compression tester.....could I do this and how, not real familiar with big blocks. What would I look for?
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1986 Chevy Crew Cab Dually(Choo-Choo Conversion) 2006 Chevy Equinox |
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#4 |
Registered User
Join Date: Jun 2004
Location: fargo N.D.
Posts: 80
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85 Cc
you should check to make sure but it should have a th-400 or old style 3 speed and yes vacuum makes a huge impact on shifting, check to see if there is vacuum at the modulator on the transmission housing, a lot of the time the rubber rots right where it goes into the mod. no vacuum no shift/late shift no down shift etc... a good tune-up might cure the engine issues, could even be bad gas from sitting, how many miles on the motor? i myself would consider going to a later model this day in age and taking advantage of a TBI truck (87 and newer) much better power but more $$$. most crew cabs are full tonners, the best ones are the ones marked with the camper special tag with dual rear wheels, they have a monster sway bar for stability with heavy loads and still drive and ride decent! john
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#5 |
Registered User
Join Date: May 2004
Location: Lubbock, Texas
Posts: 2,121
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all big blocks have a random miss in them, you can richen the hell out of the carb to make it not have it, but 1)gas millage goes down, and 2)your ET will slow down too. low engine vacum can also becaused by larger cam, also i would check the rubber line first, probally just needs to carb rebuilt.
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'96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer |
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#6 |
Happy to be here
![]() Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
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Before you going looking for vacuum leaks, check the fluid level in the tranny....
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#7 |
What I drive
Join Date: Apr 2004
Location: Star, MS
Posts: 418
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What compression reading should I look for?
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1986 Chevy Crew Cab Dually(Choo-Choo Conversion) 2006 Chevy Equinox |
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