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81 Chevy hard start once warmed up #729257
October 24th 2017 9:32 pm
October 24th 2017 9:32 pm
Joined: Oct 2017
Posts: 6
Riverside, Ca
Vanzig Offline OP
stranger
Vanzig  Offline OP
stranger
Joined: Oct 2017
Posts: 6
Riverside, Ca
Hello all, I am having an issue with my 1981 G10 Inline6. It starts up fine and dandy when cold. Once I have driven it around and it gets to operating temperature then it becomes harder to start. It sounds a little weak when cranking and the only remedy I've found is to stomp the accelerator to the floor and hold it there to make it fire up. I know this is a common issue on older Chevy's, and I'm inclined to think it is the starter/solenoid, but after reading through forums today I found so many different recommendations online from rerouting fuel lines to carb fuel boiling and on and on. I recently set timing, did plugs, wires, cap and rotor, and had the vacuum lines routed correctly. This is a stock motor. This issue was there before, and still is after the tune up. it does run better and smoother and is not dieseling any longer, but still hard to start when warm. Any ideas that a basic driveway mechanic like me can look into?

Re: 81 Chevy hard start once warmed up [Re: Vanzig] #733172
February 17th 2018 1:10 pm
February 17th 2018 1:10 pm
Joined: Feb 2018
Posts: 1
Bremerton, kitsap county, WA
N
Necrovancer_shaun Offline
stranger
Necrovancer_shaun  Offline
stranger
N
Joined: Feb 2018
Posts: 1
Bremerton, kitsap county, WA
I've got the same issue on my 76 inline 6, you ever figure this out?

Re: 81 Chevy hard start once warmed up [Re: Vanzig] #733173
February 17th 2018 1:37 pm
February 17th 2018 1:37 pm
Joined: Jun 2010
Posts: 13,703
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 13,703
Van Diego California
Welcome to the site shaun ... Reed would be the one to answer this ...


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: 81 Chevy hard start once warmed up [Re: Vanzig] #733174
February 17th 2018 3:01 pm
February 17th 2018 3:01 pm
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 11,783
Fircrest, WA
Hi! I am not a Chevy guy, so I probably skimmed right over this originally because I don't like to talk about things I know nothing about. However, I am happy to offer generic advice regarding carbureted motors. So I will do my best.

Originally Posted by Vanzig
Hello all, I am having an issue with my 1981 G10 Inline6. It starts up fine and dandy when cold. Once I have driven it around and it gets to operating temperature then it becomes harder to start. It sounds a little weak when cranking and the only remedy I've found is to stomp the accelerator to the floor and hold it there to make it fire up.


It sounds like the problem you are describing is the engine will turn over/crankspin fast when the engine is cold but once the engine gets warm/hot it turns over/cranks slowly. An engine that cranks fine cold but turns over slowly when hot usually is an electrical issue, specifically the starter motor is weak and failing. I had this same problem years ago on my 89 Ford van. My solution was to buy a hi-torque mini-starter and wrap it in some heat shield material. It has been working fine for over a decade without me even thinking about it.

Heat soak can cause a starter motor to get weak and eventually fail. You can try getting a starter motor heat shield kit like I did (thermo barrier blanket secured with a metal zip tie or two) and see if that ake any difference. If it does, then your starter motor is probably getting old and needs to be rebuilt (if possible- try and find a local shop to rebuild your original) or replaced (try and find NOS or used original, don't get a Cardone remanufactured unit, they often are bad).

If the problem is the starter motor, then it won't make a difference if you hold the gas pedal down or not. The carburetor has absolutely nothing to do with the starter motor.

Originally Posted by Vanzig
I know this is a common issue on older Chevy's, and I'm inclined to think it is the starter/solenoid, but after reading through forums today I found so many different recommendations online from rerouting fuel lines to carb fuel boiling and on and on. I recently set timing, did plugs, wires, cap and rotor, and had the vacuum lines routed correctly. This is a stock motor. This issue was there before, and still is after the tune up. it does run better and smoother and is not dieseling any longer, but still hard to start when warm. Any ideas that a basic driveway mechanic like me can look into?


I think you are on the right track with your starter motor. As I said above, try and find a local shop to rebuild yours.

It also never hurts to check the basics like your base timing. Also, check the accuracy of your timing mark. I can't speak for GM products, but I know that Ford and Chrysler products put the timing mark on the vibration damper on the end of the crank. The damper is made up of two pieces of metal, an inner section and an outer ring, bonded by vulcanized rubber. After decades of use the rubber breaks down and the outer ring can slip in relation to the center lump or detach completely. I have had both things happen to me. Since the timing mark is on the outer ring, the timing mark can actually not read accurately. You will need a piston stop tool to mark the damper and verify it shows TDC correctly.


In sum- first check your base timing. Incorrect timing can make an engine hard to start when hot. If your base timing checks out OK, then I recommend you get your starter motor inspected/rebuilt.

Incidentally, and I am not trying to be a jerk about this, the term "solenoid" is often used incorrectly by many people when discussing the starting system on cars. The only solenoid in the starting system is the starter solenoid that is (usually) bolted to the side of the starter motor and kicks out the starter gear when the key is turned. That is the only part correctly referred to as a solenoid. Many people incorrectly refer to the starter relay as the solenoid. The relay bolts to the firewall or the inner fender and has nothing but wires going to it. Its job is to take the low amp signal from the ignition switch and use it to turn the high amp battery feed on and off to the starter. When you are describing problems with your car it is always best practice to refer to parts by their correct name. It makes it easier to provide useful advice and to understand the symptoms described.

Last edited by Reed; February 18th 2018 4:26 pm.

Windows- they're what make a van worth owning!
Re: 81 Chevy hard start once warmed up [Re: Vanzig] #733182
February 17th 2018 5:03 pm
February 17th 2018 5:03 pm
Joined: Apr 2004
Posts: 1,709
Ireland
shaggy Offline
veteran
shaggy  Offline
veteran
Joined: Apr 2004
Posts: 1,709
Ireland
Yep what Reed said. I was recommended one of these...

Powermaster 9600 Mastertorque Chevy 168 / 153 Tooth Starter 180 ft-lb SBC BBC

[Linked Image]

The relay/solenoid confusion probably stems from the fact that there is a tiny electro-magnetic solenoid inside every relay, BUT it's still a relay and not a solenoid.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: 81 Chevy hard start once warmed up [Re: Vanzig] #733199
February 18th 2018 7:16 am
February 18th 2018 7:16 am
Joined: Mar 2011
Posts: 314
NY
J
jcd74 Offline
enthusiast
jcd74  Offline
enthusiast
J
Joined: Mar 2011
Posts: 314
NY
What Reed said. GM starters are a all in one starter, the contacts for the starter motor are inside the solenoid. If you have good clean connections and cables, and your battery is showing 12 volts(everything off or check if headlights are bright) the contacts are shot inside the starter or it's overall worn out. If you get stuck you can drop the starter and remove the solenoid, Take it apart and rotate the battery post(big one) 180 degrees for a fresh contact. Timing most motors with a damper is a crap shoot, you can try retarding it a little. If your cooling system is up to par, check your vacuum advance, it helps make a street motor run cooler (it should have constant vacuum. not ported). Check your mechanical advance, it may be stuck. We are required to oil the top bearing once in a while during a tune up, but no one does this. There should be little white buttons under the advance weights, they seem to wear fast and disappear. If you change the starter, get a new AC Delco.


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