Engine hesitation when warm? - Team Camaro Tech
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post #1 of 13 (permalink) Old Nov 9th, 16, 01:11 PM Thread Starter
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Carl
 
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Engine hesitation when warm?

Hey all.

Chevy 383 with Holley 750. This is a fairly recent issue, but when it warms up it starts to hesitate a little. Not making it undriveable by any means, but it's noticeable. Just replaced the spark plugs about a month ago and it was running great. You think that has anything to do with it?
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post #2 of 13 (permalink) Old Nov 9th, 16, 05:39 PM
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Re: Engine hesitation when warm?

Is the Holley 750 out of a box? I had a handful of 383 or Z/28 302 and always use a Holley AED is a must...

A stock out of the box Holley will not work, this is my experience.

AED Performance 750 HO | Pro-Street


Here is a video for my old 68, had a brand new 680 Dominator and car puked when accelerating and replaced with the Holley AED..

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post #3 of 13 (permalink) Old Nov 9th, 16, 07:20 PM Thread Starter
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Carl
 
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Re: Engine hesitation when warm?

Quote:
Originally Posted by camarodude67 View Post
Is the Holley 750 out of a box? I had a handful of 383 or Z/28 302 and always use a Holley AED is a must...

A stock out of the box Holley will not work, this is my experience.

AED Performance 750 HO | Pro-Street


Here is a video for my old 68, had a brand new 680 Dominator and car puked when accelerating and replaced with the Holley AED..

https://youtu.be/Ecjb2OWoLAA
It's not necessarily out of a box. I've been running it for 2 years without any issues. This is a recent problem, I'm thinking based on the plugs I'm using. Is hesitation when warm related to plug temperature?
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post #4 of 13 (permalink) Old Nov 10th, 16, 03:31 AM
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Re: Engine hesitation when warm?

If it was fine and you only swapped plugs...I would pull each one, check gap, and be sure the plug wire is snapped on as well as in the correct firing order.
I would also change the cap and rotor on the distributor. (how old are they?)

Could even be something as simple as bad gas ?

Can you post a video of the issue to maybe help ?

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #5 of 13 (permalink) Old Nov 10th, 16, 05:10 AM
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Re: Engine hesitation when warm?

OK what type of Distributor setup are you using? HEI, MSD? Post a video and maybe we can hear or see something with your setup...
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post #6 of 13 (permalink) Old Nov 10th, 16, 06:28 AM
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George
 
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Re: Engine hesitation when warm?

start with basics: check timing, make sure plugs and plug wires are tight, pull cap and rotor and hit it with electronic contact cleaner.

Might just be a loose plug.

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post #7 of 13 (permalink) Old Nov 10th, 16, 07:51 AM
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Re: Engine hesitation when warm?

If it ran fine before you changed plugs why did you change them?

Did you replace them with the same plugs as the ones you took out?

Have you put the old ones back in to see if that solves the problem?

Just saying if all you did was change plugs then IMO the plug have to be the issue.

Maybe a plug wire crossed?

I would not start fooling with other stuff until the new plugs are ruled out as the culprit.
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post #8 of 13 (permalink) Old Nov 10th, 16, 09:15 AM
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Re: Engine hesitation when warm?

Quote:
Originally Posted by Vega$69 View Post
If it ran fine before you changed plugs why did you change them?

Did you replace them with the same plugs as the ones you took out?

Have you put the old ones back in to see if that solves the problem?

Just saying if all you did was change plugs then IMO the plug have to be the issue.

Maybe a plug wire crossed?

I would not start fooling with other stuff until the new plugs are ruled out as the culprit.
The easiest solution here is to scrap everything and drop an LS into it, right?

Sold:
1968 Base hardtop 250 with a P̶G̶ built 2004r
Offy intake
Holley 390 CFM carb
Langdon split header to a 2.5" exhaust
Mild cam
Custom interior
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post #9 of 13 (permalink) Old Nov 10th, 16, 11:39 AM Thread Starter
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Cool Re: Engine hesitation when warm?

Quote:
Originally Posted by Gbauer View Post
The easiest solution here is to scrap everything and drop an LS into it, right?
Haha yes! Should I send you my address so you can send me one?
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post #10 of 13 (permalink) Old Nov 10th, 16, 11:40 AM Thread Starter
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Carl
 
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Re: Engine hesitation when warm?

Quote:
Originally Posted by Vega$69 View Post
If it ran fine before you changed plugs why did you change them?

Did you replace them with the same plugs as the ones you took out?

Have you put the old ones back in to see if that solves the problem?

Just saying if all you did was change plugs then IMO the plug have to be the issue.

Maybe a plug wire crossed?

I would not start fooling with other stuff until the new plugs are ruled out as the culprit.
The ones that were in there originally, I gapped them incorrectly. It ran great after the swap, but no I didn't replace them with the same ones. I should go back and check the wires like you're saying.
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post #11 of 13 (permalink) Old Nov 10th, 16, 12:14 PM
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Re: Engine hesitation when warm?

Quote:
Originally Posted by blackmagik3 View Post
The ones that were in there originally, I gapped them incorrectly. It ran great after the swap, but no I didn't replace them with the same ones. I should go back and check the wires like you're saying.
If the original plugs were running great what was the reason for not using the same when you replaced them.

Basically what I'm saying is if was good and you made a change and now it's bad go back and undo what you did.
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post #12 of 13 (permalink) Old Nov 10th, 16, 12:28 PM Thread Starter
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Re: Engine hesitation when warm?

Quote:
Originally Posted by Vega$69 View Post
If the original plugs were running great what was the reason for not using the same when you replaced them.

Basically what I'm saying is if was good and you made a change and now it's bad go back and undo what you did.
You're right. That makes the most sense, but I trashed those plugs. The tips were ruined anyway. Also, I don't have the best measure of when something is running right. I'm learning as I go, but I could feel the difference in a good way when I changed them. I'll get some different ones and check the wires.
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post #13 of 13 (permalink) Old Nov 10th, 16, 12:42 PM Thread Starter
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Carl
 
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Re: Engine hesitation when warm?

I just read something that said if you have the wrong plugs you'll have misfires. Sounds about right. Thanks for the help!
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