01-24-2019, 10:50 PM | #1 |
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starting issue
Ive noticed for some time now that I am having a starting issue. My truck starts fine when the motor is cold. But when it is warm, it turns over a lot more than normal before it fires. Do you guys have any suggestions on what could be my problem?
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01-24-2019, 11:31 PM | #2 |
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starting issue
Ive noticed for some time now that I am having a starting issue. My truck starts fine when the motor is cold. But when it is warm, it turns over a lot more than normal before it fires. Do you guys have any suggestions on what could be my problem?
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01-24-2019, 11:59 PM | #3 |
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Re: starting issue
What carb?
What’s your initial timing? |
01-25-2019, 07:42 AM | #4 | |
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Re: starting issue
Quote:
If this is the case the engine is flooding when hot making hard to crank when hot and usually will crank fine cold . Just one thing to check and the first thing I would check to rule it out . |
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01-25-2019, 11:00 AM | #5 |
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Re: starting issue
Assuming a carb, some possible suspects:
Choke sticking partially stuck or closing while motor still hot. Carb too hot and fuel boiling off - if you still have a exhaust heat riser valve, check for it being stuck. Defect in fuel pump/carb needle-seat letting fuel in carb bowl drain back into tank. |
01-25-2019, 03:02 PM | #6 |
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Re: starting issue
Gas tank not venting properly.
Check the gas cap.
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01-26-2019, 10:43 AM | #7 |
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Re: starting issue
It would help if you posted year, engine and whether it's carbed.
First, suspect the carb flooding if you have not done any work on the ignition system or fuel system. Have someone look at your exhaust after it starts when warm and sitting for a few minutes. Dark gray smoke is fuel. If carbed, check choke. If it's a qjet, leaking well plugs could be the problem.
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01-26-2019, 08:00 PM | #8 |
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Re: starting issue
Edelbrock carb? Reason I ask is they tend to act like a heat sink unless they have a beefy insulator type base gasket. Like this:
https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds these help the problem but not 100%. I have had even better results with a 4 hole 1"phenolic carb spacer. Last edited by AcampoDave; 01-26-2019 at 08:05 PM. |
01-26-2019, 11:36 PM | #9 |
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Re: starting issue
Thanks for all of the replies. It is a late 70's 350 that bored to a 355. Im running a Holley 650 carb. I will check the carb and see if it is leaking fuel on my next drive. Its pretty annoying when you are in a crowd and it wont start right off. I do know that there is no smoke coming from it.
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01-26-2019, 11:59 PM | #10 |
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Re: starting issue
I bet even a Holley would benefit from an insulator gasket. I've seen 'em on Quadrajets too.
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01-26-2019, 11:59 PM | #11 | ||
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Re: starting issue
It sounds like you're used to FI rigs firing right up every single time.
If you're pumping the pedal at all when the rig is warm, it'll take way longer to light off. If it's only "cranking" 5 times or so when you turn the key to start when warm... I'd say it's pretty normal. If you have to crank it, then turn key off. Crank it again, turn key off, Etc. until it finally starts. Then you have an issue. Gary
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01-27-2019, 01:09 AM | #12 |
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Re: starting issue
I suggest upgrading to
hei |
01-27-2019, 03:41 PM | #13 | |
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Re: starting issue
Quote:
Did the problem start suddenly, gradually or has it always had a starting problem? How long do you have to crank before it starts? (seconds). As mentioned check the choke to make sure it's open when warm and check the timing.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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01-27-2019, 11:40 PM | #14 |
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Re: starting issue
This issue has gradually started. My dad bought this truck new and it has had different motors put in it. I was fine with the way that it starts, but the few times that he took it out, he has complained as in there is a problem with it. Like said, when it is a cold start, it fires right up. But on a warm start, it turns over quite a few times and sometimes, you have to press the accelerator a little to get it started.
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01-27-2019, 11:55 PM | #15 |
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Re: starting issue
What’s your initial timing and have you checked it lately?
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01-28-2019, 01:01 AM | #16 |
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Re: starting issue
My '71 GMC starts best warm if I just twist the key with no accelerator pedal. Usually will start just like our LS powered daily drivers. If it doesn't start on the very first turn or two, I ease a little accelerator pedal on as it's turning. If I step on the gas before turning the key, it has to turn awhile before it starts. When it's cold I push the accelerator pedal down once lightly to set the choke/fast idle and take my foot off the pedal.. turn the key and it fires right off on fast idle 'till I blip the throttle. Original 350 engine, HEI dist, 650 Holley, Edelbrock Performer intake, cast iron exh. manifolds.
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01-29-2019, 11:05 PM | #17 |
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Re: starting issue
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01-29-2019, 11:41 PM | #18 |
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Re: starting issue
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01-31-2019, 11:14 AM | #19 | |
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Re: starting issue
Quote:
Does it still have the old points in the dizzy ? |
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01-31-2019, 10:46 PM | #20 | |
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Re: starting issue
Quote:
I will check it and see. What are your thoughts? Timing too high? Also, it is a later model motor so no points. |
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01-31-2019, 11:01 PM | #21 |
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Re: starting issue
Check the timing first, see where it is and than go from there. Let us know the process of how you checked your timing. thanks...
The reason I mentioned points was from post #12 about upgrading to HEI. Thought he knew something about your vehicle more than what was already mentioned. |
02-16-2019, 01:41 PM | #22 |
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Re: starting issue
starter heat soak
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02-16-2019, 04:25 PM | #23 |
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Re: starting issue
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02-16-2019, 08:57 PM | #24 |
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Re: starting issue
I would suggest that if you are already having problems, to late for a shield , replace it with a high torque version and install the shield on that
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02-16-2019, 09:54 PM | #25 |
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Re: starting issue
Nothing in the thread suggests the starter is cranking slowly so nothing suggests heat soak, which is generally a myth. Slow cranking is usually caused by faulty wiring so let's try yo keep the nonsense to a minimum.
I'd try pressing the gas to the floor when cranking warm. If it starts quicker the carb might be dripping gas out of the bowls. A warm tuned SBC typically fires with a touch of cranking and no stepping on the gas. |
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