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LMC Truck



Username Post: New Guy With 91 Astro Needs Help!        (Topic#347002)
ROCKNBLUES 
Forum Newbie
Posts: 6

Reg: 09-05-17
09-05-17 05:59 PM - Post#2706785    

Hi Folks,
I've been a pretty good mechanic on older vehicles for fifty years, but I have no idea what to do or where to start on my "New To Me" Astro Van, that I just bought to haul my band around town. I want to go through everything that I can in one pull of the doghouse. Here's what I've got:

1991 Base model Astro cargo van, 80,000 miles with 4.3 engine, automatic transmission, AC and manual windows, mirrors, etc. No leaks and all except the cruise control functions as it should. Sometimes it "stumbles" a little when accelerating from a stop and also seems to stumble after each upshift and on other various occasions. Also, while stopped, in gear, the egine will randomly stumble/cough/hiccup (or what ever you want to call it) and then the RPM increases for a split second, as it catches. It has not yet stalled or stopped.

My initial plan is to remove the doghouse and replace:

A) Spark plugs
B) Distributor cap, rotor & wires.
C) All filters I can find, along with the PCV valve
D) Inspect/replace all vacuum hoses that are changeable. One concern is that there may be some of those silly "harder" plastic vacuum lines that aren't intended to be easily replaced!
E) While I have no idea which computer/engine management system this has or any of the "alphabet soup" identifying it, I really want to learn how to test, check and/or replace any and all stuff pertaining to proper engine and transmission operation.

Oil and filter have been changed and I plan to tackle the heater and radiator hoses also.

My inclination to do this all myself is not just to save a few $$$ (though that isn't a bad thing), but rather to make sure it gets done right and all the "I's" are dotted and "T's" are crossed! I am always leary to have anyone else "FIX" my stuff, as there are so many incompetent workmen out there!

Any and all help identifying what I'm working with and my best courses of action , would be much appreciated!

Thanks In Advance,
Gene



 
LMC Trucks
SleeperSS 
Senior Member
Posts: 2537
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
09-05-17 07:21 PM - Post#2706789    
    In response to ROCKNBLUES

  • ROCKNBLUES Said:
Hi Folks,
I've been a pretty good mechanic on older vehicles for fifty years, but I have no idea what to do or where to start on my "New To Me" Astro Van, that I just bought to haul my band around town. I want to go through everything that I can in one pull of the doghouse. Here's what I've got:

1991 Base model Astro cargo van, 80,000 miles with 4.3 engine, automatic transmission, AC and manual windows, mirrors, etc. No leaks and all except the cruise control functions as it should. Sometimes it "stumbles" a little when accelerating from a stop and also seems to stumble after each upshift and on other various occasions. Also, while stopped, in gear, the egine will randomly stumble/cough/hiccup (or what ever you want to call it) and then the RPM increases for a split second, as it catches. It has not yet stalled or stopped.

My initial plan is to remove the doghouse and replace:

A) Spark plugs
B) Distributor cap, rotor & wires.
C) All filters I can find, along with the PCV valve
D) Inspect/replace all vacuum hoses that are changeable. One concern is that there may be some of those silly "harder" plastic vacuum lines that aren't intended to be easily replaced!
E) While I have no idea which computer/engine management system this has or any of the "alphabet soup" identifying it, I really want to learn how to test, check and/or replace any and all stuff pertaining to proper engine and transmission operation.

Oil and filter have been changed and I plan to tackle the heater and radiator hoses also.

My inclination to do this all myself is not just to save a few $$$ (though that isn't a bad thing), but rather to make sure it gets done right and all the "I's" are dotted and "T's" are crossed! I am always leary to have anyone else "FIX" my stuff, as there are so many incompetent workmen out there!

Any and all help identifying what I'm working with and my best courses of action , would be much appreciated!

Thanks In Advance,
Gene



A couple of things. AC DELCO Iridium plugs...OEM wires. I like OEM cap & rotor...but, I've been using United Ignition cap/rotor because it came with the distributor...brass contacts and rotor tip. as long as we're talking ignition...your distributor is 26 hears old...time for a new one. United Ignition has an aluminum unit with cap/rotor for $100 at Rockauto...get one. Post a pic of your engine so we can see what you're working with. At a minimum...TPS and IAC Vallve will most likely help with your idle/stumble problems. Hard bvaccum lines usually have short flex lines that can be replaced...n o need to mess with the hard line unless they're cracked.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
ROCKNBLUES 
Forum Newbie
Posts: 6

Reg: 09-05-17
09-05-17 08:02 PM - Post#2706791    
    In response to SleeperSS

Did not find United Ignition Distributor for a 91 Astro at RockAuto. Do you really think it needs a distributor at 80,000 miles? It would seem that wear deteriorates a distributor, not time. I appreciate and agree with brass contacts cap/rotor and OEM wires. Will likely go for Standard or AC/DELCO on the cap.

FWIW, and in the interest of saving time, this may be my first BBQ with a TBI Astro, but not my first rodeo with Chevy vans. I've got several million miles under my rump in pre-85, G20 & G30 vans, as well as an 85 carbureted Astro I had years ago!

Thank You,
Gene



 
SleeperSS 
Senior Member
Posts: 2537
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
09-05-17 08:11 PM - Post#2706792    
    In response to ROCKNBLUES

Honestly....GM distributors are not the best...at least the 4.3's. Skip White has incredible deals on aluminum distributors...

https://www.skipwhiteperformance.com/catalog/categ...

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
LMC Trucks
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