Author Topic: hot start issues on a 1978 trans am  (Read 1502 times)

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Offline pontiac 400 TRANSAM

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hot start issues on a 1978 trans am
« on: January 30, 2020, 06:26:14 AM »
Hello everyone

Can anyone please tell me what to check with hot start issues on a 1978 trans am just in point form.Like 1 2 3 4 etc

I know this has been covered a  million times just looking for the most common fix  and repair that has worked for fellow Pontiac enthusiasts .


Engine pontiac 400 ,350 trans .

Thank you

AL
« Last Edit: January 30, 2020, 06:29:11 AM by pontiac 400 TRANSAM »

Offline Maxthe222

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Re: hot start issues on a 1978 trans am
« Reply #1 on: January 30, 2020, 06:27:53 AM »
Hey mate, what's hot start mean? Like your starter motor is overheating?
'79 Y84 WS6 T/A
'79 W72 WS6 F/A
'71 FRMLA 400/4-Spd

Offline pontiac 400 TRANSAM

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Re: hot start issues on a 1978 trans am
« Reply #2 on: January 30, 2020, 06:31:37 AM »
No after the car runs  for a while and i stop the engine while the engine is hot, it has trouble restarting and wont start.


Once it cools engine stats like its new!

Offline Stringer

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Re: hot start issues on a 1978 trans am
« Reply #3 on: January 30, 2020, 09:44:50 PM »
Will it start after it sits for a while and cools down? If it does, you are experiencing vapor lock. If it is something else, you need to describe the symptoms better, because it could be a rage of things.

Offline Aus78Formula

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Re: hot start issues on a 1978 trans am
« Reply #4 on: January 30, 2020, 10:16:50 PM »
Do you have headers? Original steel line of rubber fuel hose to carb? What carb? What intake, any insulator plate or rubber hose sleeve? Timing is ok?

Offline pontiac 400 TRANSAM

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Re: hot start issues on a 1978 trans am
« Reply #5 on: January 31, 2020, 04:41:08 AM »
Hi yes i have headers and the metal fuel line stops at the altinator and changers to a rubber fuel line to the carby.

regards
Al

Offline pontiac 400 TRANSAM

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Re: hot start issues on a 1978 trans am
« Reply #6 on: January 31, 2020, 04:44:24 AM »
Could it be the Neutral Safety Switch as i have seen that this may cause non start issues im going to replace this and see but im open to suggestions of what else to look including vapour lock.

regards
Al

Offline Aus78Formula

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Re: hot start issues on a 1978 trans am
« Reply #7 on: January 31, 2020, 04:47:02 AM »
Is it LHD ir RHD? It's not related to a hot start issue but will be different for each. Do you know the age of the fuel pump? Also, check you have correct vented fuel cap. While separate issues they can make the heatsoak worse if fuel supply is already strained.
« Last Edit: January 31, 2020, 04:52:34 AM by Aus78Formula »

Offline b_hill_86

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Re: hot start issues on a 1978 trans am
« Reply #8 on: January 31, 2020, 10:16:56 AM »
You could try a soft starter heat wrap but donít wrap it around the starter as intended. Wrap it around the header near the starter to block the heat from the header but thatíll allow cooler air to get to the starter and see if that changes anything.

I had issues with my header cooking my starter too and it would almost never restart immediately after driving. I havenít made a more permanent heat shield but ever since wrapping my header it starts reliably every time. Been like that for several years now.

Might not be your only issue but if so hope it helps.
-Brian-

1977 Trans Am 400 4 speed hardtop

Offline pontiac 400 TRANSAM

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Re: hot start issues on a 1978 trans am
« Reply #9 on: February 01, 2020, 02:39:52 AM »
Thanks Brian and to everyone you has given me start points to eliminate the problem. This is fantastic.

I will heat wrap the headers (starter heat  sheilding ) and fuel line (vapour lock)and see what happens .
I will also replace the neutral safety switch.
I should have this done in the next week and I will let you know what happens with the hot start issue.And were i  go if not fixed
I really appreciate the help so far.

Regards
Al

Offline tz6p06

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Re: hot start issues on a 1978 trans am
« Reply #10 on: February 04, 2020, 09:11:38 AM »
I had the same issue and replaced the original style starter with a mini starter and the problem is gone.

Offline kentuckyyeti

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Re: hot start issues on a 1978 trans am
« Reply #11 on: February 05, 2020, 02:44:17 PM »
I had the same issue and replaced the original style starter with a mini starter and the problem is gone.

Exact same issue with every one of our Firebirds with headers.  Same as tz;   installed a hi -torque mini starter and thatís been the end of issue every time.

Offline JAL71TA

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Re: hot start issues on a 1978 trans am
« Reply #12 on: February 16, 2020, 10:42:06 PM »
If you have to replace the starter look or a "brown capped solenoid.

Jim