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96 Chevy 1500 Hard start when hot


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rm1239
New User

Aug 19, 2009, 5:05 AM

Post #1 of 12 (10175 views)
96 Chevy 1500 Hard start when hot Sign In

1996 Chevy FWD Z-71 235,000 miles auto trans with A/C.
Starts fine when cold or cooled off but turns over very slow when hot.
New plugs, wires, cap, rotor, distrbutor, cam & crank sensors.
Have run injector cleaner through 3 or 4 tanks of gas & truck runs fine.
Just seems to start hard when hot.
Any idea?


Hammer Time
Ultimate Carjunky / Moderator
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Aug 19, 2009, 7:57 AM

Post #2 of 12 (10165 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

What do you mean by "turns over slow"? Do you mean it actually cranks slower?
What engine does it have?



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rm1239
New User

Aug 19, 2009, 8:31 AM

Post #3 of 12 (10157 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

Thanks for the reply,

1996 Chevy 1500 350 V8

After driving to anywhere running the truck long enuogh to reach opperating temperatrure

I shut the motor of and go into the grocery store for 15 minutes

When I try to restart It takes all the starter has to turn the engine

after 2 or 3 key hits she spins & fires & runs fine


Hammer Time
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Aug 19, 2009, 9:24 AM

Post #4 of 12 (10151 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

That sounds like a bad starter but you need to test the battery capacity first. Once you know you have sufficient battery reserve, then you can test starter draw. Anything over 250A would be excessive. This needs to be test while the truck is hot and the problem is present.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



rm1239
New User

Aug 19, 2009, 9:52 AM

Post #5 of 12 (10145 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

The starter does it's job even when hot and the problem occurrs

Seems maybe like a vapor lock thought I've never encountered such a thing

I would like to know how to test the wiring between the battery, the starter & the computer

I live & work in the northeast where we have lots of salt laid down on the roads to melt the snow & ice.

If this is not a temperature sensor problem then perphaps a bad ground?


Hammer Time
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Aug 19, 2009, 10:02 AM

Post #6 of 12 (10139 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

If you think you know better, then go for it.

By the way, there is no such thing as a vapor lock in that system.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Loren Champlain Sr
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Aug 20, 2009, 12:16 PM

Post #7 of 12 (10129 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

HT couldn't have said it any better. 1) Check battery 2) Check starter draw 3) Fuel injection doesn't vapor lock. In fact, I haven't run into a vapor lock problem in, probably, 30 years.
Without taking the time to check, if this has an adjustable distributor, over advanced timing can cause the symptom.
Now, you said the 'starter does it's job'. Do you mean that the engine cranks over, just fine, but won't start? That would be something totally different.
Loren
SW Washington

(This post was edited by Loren Champlain Sr on Aug 20, 2009, 12:17 PM)


rm1239
New User

Aug 20, 2009, 12:28 PM

Post #8 of 12 (10124 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

When the engine is hot the starter works harder to turn the engine.

Upon having the battery tested the reading was 10.59 & Bad Battery come up on the screen.

AutoZone, they couldn't test starter draw.

So I guess I need a battery.

Only 6.5 years old


Loren Champlain Sr
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Aug 20, 2009, 12:32 PM

Post #9 of 12 (10122 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

Nope, can't test starter draw with a bad battery. 6.5 yrs old, and it's bad? Geeeeez. Go figure.
Loren
SW Washington


Hammer Time
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Aug 20, 2009, 12:36 PM

Post #10 of 12 (10116 views)
Re: 96 Chevy 1500 Hard start when hot Sign In


Quote
Without taking the time to check, if this has an adjustable distributor, over advanced timing can cause the symptom.


The distributor does turn but the timing is not adjustable.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Loren Champlain Sr
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Aug 21, 2009, 9:40 AM

Post #11 of 12 (10109 views)
Re: 96 Chevy 1500 Hard start when hot Sign In

Good catch, HT....That's one of those that you've got to hold the throttle open until the rods come out of the block for it to sync. I hate that when we have to do it, especially on a high-miler.
Loren
SW Washington


Hammer Time
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Aug 21, 2009, 9:44 AM

Post #12 of 12 (10106 views)
Re: 96 Chevy 1500 Hard start when hot Sign In


Quote
Good catch, HT....That's one of those that you've got to hold the throttle open until the rods come out of the block for it to sync. I hate that when we have to do it, especially on a high-miler.


I suspect your kidding on that one. Never heard of doing that. Don't know any way besides a tech2 to get it right.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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