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83 305 crossfire no start when hot

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Old 10-11-2018, 04:47 PM
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83 305 crossfire no start when hot

I am currently working on a 83 305 Z28 camaro. When its cold it starts fine When its hot it won't start at all. There is no injector pulse. I have replaced the coil pickup, module, rotor, & in cap coil...any help would be appreciated TIA
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Old 10-11-2018, 07:34 PM
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Re: 83 305 crossfire no start when hot

When this occurs. Have you unplugged both injectors and checked for pulse. Iirc the injectors should be 2.5ohms .
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Old 10-15-2018, 01:21 PM
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Re: 83 305 crossfire no start when hot

Originally Posted by Tuned Performance View Post
When this occurs. Have you unplugged both injectors and checked for pulse. Iirc the injectors should be 2.5ohms .
Noid lite does not blink on either injector
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Old 10-15-2018, 01:24 PM
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Re: 83 305 crossfire no start when hot

Originally Posted by jbrodder View Post
Noid lite does not blink on either injector
Replaced coil pickup, module, coil, fuel pump, fuel pump relay. Going to replace electronic spark control module tomorrow
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Old 10-15-2018, 02:52 PM
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Re: 83 305 crossfire no start when hot

no 2 second pulse of fuel pump when hot. if I shoot a small shot of ether into tbi it fires right up
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Old 10-16-2018, 03:03 PM
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Re: 83 305 crossfire no start when hot

Few questions, what do you mean exactly by "when hot"? How "hot"? How long does it take to get to "hot"? Will it stop running when it reaches "hot" or just not start back? At what temperature will it re-start?
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Old 10-16-2018, 07:50 PM
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Re: 83 305 crossfire no start when hot

It starts fine cold, if you drive it for 20 to 30 minutes & shut it off it will not start until it cools down. By hot I mean operating temp. It doesn’t go over 190 degrees. When you try to restart it it turns over finre. There is no injector pulse but there is spark at the plugs. If you give it a little shot of ether it’s starts right up. Also I do not see a 2 second fuel pump run.
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Old 10-17-2018, 12:00 PM
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Re: 83 305 crossfire no start when hot

Have you checked/replaced the temp sensor? The one for the ECM, not the gauge on the dash (maybe it's sending a freaked out reading to the computer after it gets hot). Also verify there is 12 volts reading at both injector plugs (red on one and white on other I think), those go to the injector fuses. Should be hot with ignition switch in on position. Obviously they will test fine when it WILL start, but what about when it WON'T? Also did you get a value for the resistance at the injectors themselves as Tuned Performance stated? I would recommend a cold ohms reading as well as another after the engine gets to temp.

Last edited by jstadmud; 10-17-2018 at 01:51 PM.
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Old 10-17-2018, 01:56 PM
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Re: 83 305 crossfire no start when hot

If you flash the check engine light, are there any codes present?
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