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Hard start when warm
#764280 August 02nd 2020 1:32 pm
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I am having trouble starting the van when warm. When it is cold I can give the gas two even pumps and she fires right up. If I have driven it recently it usually takes 2 or 3 attempts to start. I have been trying 1 full pump on the gas, just a half gas pedal hold, 2 full pumps, and none of that seems to really change or help.


1977 Chevy G20 with 350
Re: Hard start when warm
jtozier406 #764281 August 02nd 2020 2:21 pm
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Shouldnt have to pump it at all to start it ....


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: Hard start when warm
frscke1 #764285 August 02nd 2020 2:46 pm
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Originally Posted by frscke1
Shouldnt have to pump it at all to start it ....


You're just talking about when it's warm correct?


1977 Chevy G20 with 350
Re: Hard start when warm
jtozier406 #764288 August 02nd 2020 4:20 pm
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Ive been on many many trips for weeks at a time, north and south and neither of my vans cold blooded 454 RAT motors need to be pumped


Hard start in HOT weather means you have an amperage prob ... cant get enough to crank the hot starter ..... try going to a reduction gear starter.... way less amps required to turn it over

Another thing is check all ground straps and batt cables as things expand in HOT weather, you may be losin contact

Last edited by frscke1; August 02nd 2020 4:27 pm.

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: Hard start when warm
frscke1 #764289 August 02nd 2020 4:27 pm
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Originally Posted by frscke1
Ive been on many many trips for weeks at a time, north and south and neither of my vans cold blooded 454 RAT motors need to be pumped


Hard start in HOT weather means you have an amperage prob ... cant get enough to crank the hot starter ..... try going to a reduction gear starter.... way less amps required to turn it over


It's not necessarily hot weather, more so running to a store, going in, and coming back out to a warm engine. I will try not pumping the pedal for a few days and see if I can get any more clues.


1977 Chevy G20 with 350
Re: Hard start when warm
jtozier406 #764291 August 02nd 2020 4:37 pm
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I see in your other post about headlights the ground straps is a possible answer ... you may need to do a rewire with fresh copper ....

After all the van is over 40yr old

Last edited by frscke1; August 02nd 2020 4:38 pm.

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: Hard start when warm
frscke1 #764292 August 02nd 2020 4:41 pm
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Originally Posted by frscke1
I see in your other post about headlights the ground straps is a possible answer ... you may need to do a rewire with fresh copper ....

After all the van is over 40yr old


Will do. Shouldn't be too bad and man these ac delco parts are cheap compared to my Audi we just sold!


1977 Chevy G20 with 350
Re: Hard start when warm
jtozier406 #764303 August 02nd 2020 8:21 pm
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Sounds like a carburetor problem. I have a similar problem on my 76 Dodge, starts good when cold, when hot after setting, hard to start and an odor of gas after starting, Been told it is the float, possibly the choke, or the carb just needs a complete rebuild. Timing can also affect starting when hot.

Re: Hard start when warm
jtozier406 #764305 August 02nd 2020 10:58 pm
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old hand
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Need more detail on your current carb set up, engine specs, including ignition to better diagnose. Very likely your motor is heat soaking, which always makes for hard starts after running. But we need more info


1987 B250 - Painkiller
Re: Hard start when warm
jtozier406 #764412 August 04th 2020 7:26 pm
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It's a 5.7L V8 with Edelbrock carb. I tried not pumping but it was still hard to start. Also once it starts it dies or almost dies unless I rev it for a bit.


1977 Chevy G20 with 350
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