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Camaro Forums - Chevy Camaro Enthusiast Forum (https://camaroforums.com/forum/)
-   LT1/LT4 Tech (https://camaroforums.com/forum/lt1-lt4-tech-9/)
-   -   IAC replacement. (https://camaroforums.com/forum/lt1-lt4-tech-9/iac-replacement-85131/)

HenryC Nov 3, 2020 12:45 PM
I agree with craby, I think it may have something to do with your fuel pump and getting enough fuel pressure.

95z28man Nov 3, 2020 06:24 PM
Originally Posted by craby (Post 737975)
no, do not turn key to start, what you want to do is prime the fuel pump a few times without turning the key to the start position, only to the on position so you can hear the fuel pump go on then turn off. then turn key off and wait a short time and then turn key on and listen for the fuel pump to come on and go off. if it does not do that then you didn't wait long enough. if you just turn key of then on again right away the pump will not re prime. i
I see what you're saying, I didn't explain well enough but I do that, also for a secondary reason. My oil level sensor needs to be replaced and the low oil light will stay on unless I cycle the key. What I do is turn the key to the on position for 5 seconds but not start. Back off for 5, then on for 5 and start. I'm not sure if I've ever really been able to hear the fuel pump but I'll give a good listen in the morning.

95z28man Nov 3, 2020 06:26 PM
Originally Posted by craby (Post 737963)
check fuel pressure, maybe try turning the key on then off wait for 10 seconds turn key on then off for 10 sec then try and start. fuel pressure may be low and this may help it to get up. see if that helps.
let me revisit this. So don't leave the key in the on position, just turn it on, then back off without much waiting? Then again before trying to start? I've been doing as in my above comment.

craby Nov 4, 2020 07:43 PM
sounds like your doing it right, leave the key in the on position until the fuel pump stops, you should hear it. do it three time then try turning to the start position and see if it will start up and run. if fuel pump is not coming on then that may be the issue.

HenryC Nov 5, 2020 11:49 AM
^ You shouldn't have to listen too hard for the pump, you should hear it in the drivers seat.

95z28man Nov 6, 2020 06:08 AM
Originally Posted by HenryC (Post 737998)
^ You shouldn't have to listen too hard for the pump, you should hear it in the drivers seat.
little buzz noise for about 1-2 seconds?

Everett#2390 Nov 6, 2020 08:43 AM
Yes, a buzz for about 3 seconds? with ign switch in IGN position before START

95z28man Nov 8, 2020 09:30 AM
Originally Posted by Everett#2390 (Post 738014)
Yes, a buzz for about 3 seconds? with ign switch in IGN position before START
Yup I hear it. If I turn the key off for about 5 or so seconds, I can hear it again. Hasn't seemed to make a ton of difference.

craby Nov 9, 2020 10:30 AM
ok, well have fuel pressure check when you can. how old are the spark plugs?

HenryC Nov 9, 2020 01:07 PM
Does it start then die or a few cylinders fire and die? Or do you not hear any cylinder firing until it starts?


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