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wont start hot help

Old 03-12-2019, 11:00 PM
  #1  
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Car: 1985 camaro iroc-z
Engine: 350 carb
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wont start hot help

I have a 85 camaro iroc-z with a 350 carb t5 & recently i have had the issue that it wont start warn/hot & sometimes it shuts off running & i wont start back up it cranks & engine spins but it wont start & when it wont start it drains my battery i have already replaced starter battery, ignition switch & ignition cylinder, battery to starter cable

HELP Please
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Old 03-12-2019, 11:31 PM
  #2  
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Car: 1987 Z28 Camaro
Engine: 305 LG4 4bbl
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Re: wont start hot help

Bit of vapour lock maybe?
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Old 03-13-2019, 06:52 AM
  #3  
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Engine: L03 305 V8
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Re: wont start hot help

I think I've read on here that the ICM (Ignition Control Module) acts up when hot, and when they fail you certainly get a "Cranks But Wont Run" prob.

Starter - Unlikely imo if your engine cranks.
Battery - Unlikely imo if your engine cranks.
Battery to starter cable - Unlikely imo unless it was damaged.
Ignition cylinder - Unlikely unless you got no response at turn of key.

***Ignition switch - Did you mean ICM? If so, was it new or used and was it tested prior to installation? Please ensure you have fuel & spark...
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Old 03-13-2019, 07:02 AM
  #4  
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Re: wont start hot help

Originally Posted by Ir8859 View Post
I have a 85 camaro iroc-z with a 350 carb t5 & recently i have had the issue that it wont start warn/hot & sometimes it shuts off running & i wont start back up it cranks & engine spins but it wont start & when it wont start it drains my battery i have already replaced starter battery, ignition switch & ignition cylinder, battery to starter cable

HELP Please
When this no-start occurs, does it have spark at the plugs? Does it have sufficient fuel pressure? Are engine-to-chassis grounds secure? Don't throw more parts at the car; do some basic troubleshooting.
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Old 03-13-2019, 09:32 AM
  #5  
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Car: 1985 camaro iroc-z
Engine: 350 carb
Transmission: T5
Re: wont start hot help

Originally Posted by ironwill View Post
When this no-start occurs, does it have spark at the plugs? Does it have sufficient fuel pressure? Are engine-to-chassis grounds secure? Don't throw more parts at the car; do some basic troubleshooting.

i checked grounds & they are good i even added a extra & yes guel pressure is good i have a fuel gauge
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Old 03-13-2019, 12:32 PM
  #6  
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Re: wont start hot help

Ignition control module

GD
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Old 03-14-2019, 04:12 PM
  #7  
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Car: 1985 camaro iroc-z
Engine: 350 carb
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Re: wont start hot help

Originally Posted by GeneralDisorder View Post
Ignition control module

GD

earlier today I installed the ignotion control module & still gave me the same issue
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Old 03-14-2019, 07:30 PM
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Re: wont start hot help

Originally Posted by Ir8859 View Post



i checked grounds & they are good i even added a extra & yes guel pressure is good i have a fuel gauge
This sentence causes me physical discomfort...
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Old 03-15-2019, 06:55 AM
  #9  
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Re: wont start hot help

when it refuses to start, spray starter fluid into the carb or a bit of fuel. if it refuses to light this mixture it's likely a spark issue.

if you're running the original distributor it would be worthwhile to inspect it carefully under the rotor, or just replace it. A new dist will come with a new ICM, for not much more $ than purchasing an ICM alone.
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Old 03-18-2019, 11:17 AM
  #10  
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Re: wont start hot help

Originally Posted by zed-028 View Post
This sentence causes me physical discomfort...
Kids on phones. No punctuation or capitalization.
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Old 03-18-2019, 11:54 AM
  #11  
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Transmission: T56
Re: wont start hot help

Are you sure its carb and not a throttle body injection system?

If Carb are you running an Electrical or mechanical pump? What is the engine out of (I don't think you could get a 350 in 85)

Before you go replacing parts, pull a spark plug and have someone turn it over during a no start situation and see if you are getting spark, and note the intensity of the spark. Also note the condition of the plug. ICM, Distributor, coil, or other ignition issue should be observable as either no spark, weak spark, or spark not hot enough (color of spark).

You can also buy an inline spark tester for a few bucks that goes between the wire and the plug or the cap and the wire. Being a carb it should be easy enough to diagnose. I'm assuming the float bowl is full during this situation, if it is that would be a indicator that you don't have full vapor lock. If its empty you may have a float that is getting stuck at the top or some other issue there (I'll let the carb gurus chime in if that is the case)

Just note its not too uncommon to get a bad ICM from the parts store also make sure you are using the thermal compound and have it mounted tight (and have cleaned the surface)

Last edited by Aviator857; 03-18-2019 at 11:58 AM.
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