Need help!
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
Need help! hey so i’m new to this forum, i ended up building my first engine, from an old 03 5.3 i bought because my old one blew in my 2000 silverado, i did everything as i should (or atleast i hope i did) but i started her, ended up swapping the cam while i was at it, it’s a texas speed stage 3 cam along with ls7 lifters, the springs and the pushrods, ended up getting it tuned from a guy, but the truck idles high and is accelerating on its own, and wants to stall when i put it in reverse, won’t go over 30 mph but will rev up on its own, not sure what it could be i’m beginning to lose my mind PLEASE HELP!
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
Need help!! hey so i’m new to this forum, i ended up building my first engine, from an old 03 5.3 i bought because my old one blew in my 2000 silverado, i did everything as i should (or atleast i hope i did) but i started her, ended up swapping the cam while i was at it, it’s a texas speed stage 3 cam along with ls7 lifters, the springs and the pushrods, ended up getting it tuned from a guy, but the truck idles high and is accelerating on its own, and wants to stall when i put it in reverse, won’t go over 30 mph but will rev up on its own, not sure what it could be i’m beginning to lose my mind PLEASE HELP!
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
the thing is the tuner did tell me the tune is set for a stage 2 cam, and when i texted him about coming to check it out he kept looking for excuses, i’m currently thinking it needs idle relearn, i’m pretty new to this, so i honestly don’t know how to check for a vacuum leak, and most definitely don’t know anything about tuning, but thanks!
Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
Texas Speed has 5 versions of what you say is a Stage 3 cam, which one do you have?
There a couple ways to test for vacuum leaks:
Smoke test which requires you to take it to a shop and will cost time/money.
Purchase a vacuum gauge from your local auto parts store to verify vacuum (never a bad idea to have tools for the future).
Or the tried and true spray WD-40 around the back side of the TB, vacuum hose connections, and then around where the intake manifold meets the heads.
Any service engine soon lights flashing or present?
I assume this is a cable operated throttle body? With the vehicle off ensure the throttle is returning correctly and then repeat when running (while in park). Just a couple quick snaps of the throttle and maybe even hold it at a low steady RPM and then let off to see what it does.
Start checking all wires/connectors up to the throttle body (IAC/TPS) to make sure good and secure.
I'd guess still has a MAF? Installed correct direction for airflow? Wiring/connectors all good secure?
There a couple ways to test for vacuum leaks:
Smoke test which requires you to take it to a shop and will cost time/money.
Purchase a vacuum gauge from your local auto parts store to verify vacuum (never a bad idea to have tools for the future).
Or the tried and true spray WD-40 around the back side of the TB, vacuum hose connections, and then around where the intake manifold meets the heads.
Any service engine soon lights flashing or present?
I assume this is a cable operated throttle body? With the vehicle off ensure the throttle is returning correctly and then repeat when running (while in park). Just a couple quick snaps of the throttle and maybe even hold it at a low steady RPM and then let off to see what it does.
Start checking all wires/connectors up to the throttle body (IAC/TPS) to make sure good and secure.
I'd guess still has a MAF? Installed correct direction for airflow? Wiring/connectors all good secure?
TECH Addict
Joined: Dec 2004
Posts: 2,177
Likes: 627
From: Florida
find someone that actually knows how to tune and have them fix it. also that cam is probably too big. i have no idea what the numbesr are but in the world of stupid *** cam names, stage 3 tends to imply its fairly large compared to stock.
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Verdad Gallardo Thread Starter
Staging Lane
Joined: Feb 2023
Posts: 63
Likes: 6
Texas Speed has 5 versions of what you say is a Stage 3 cam, which one do you have?
There a couple ways to test for vacuum leaks:
Smoke test which requires you to take it to a shop and will cost time/money.
Purchase a vacuum gauge from your local auto parts store to verify vacuum (never a bad idea to have tools for the future).
Or the tried and true spray WD-40 around the back side of the TB, vacuum hose connections, and then around where the intake manifold meets the heads.
Any service engine soon lights flashing or present?
I assume this is a cable operated throttle body? With the vehicle off ensure the throttle is returning correctly and then repeat when running (while in park). Just a couple quick snaps of the throttle and maybe even hold it at a low steady RPM and then let off to see what it does.
Start checking all wires/connectors up to the throttle body (IAC/TPS) to make sure good and secure.
I'd guess still has a MAF? Installed correct direction for airflow? Wiring/connectors all good secure?
There a couple ways to test for vacuum leaks:
Smoke test which requires you to take it to a shop and will cost time/money.
Purchase a vacuum gauge from your local auto parts store to verify vacuum (never a bad idea to have tools for the future).
Or the tried and true spray WD-40 around the back side of the TB, vacuum hose connections, and then around where the intake manifold meets the heads.
Any service engine soon lights flashing or present?
I assume this is a cable operated throttle body? With the vehicle off ensure the throttle is returning correctly and then repeat when running (while in park). Just a couple quick snaps of the throttle and maybe even hold it at a low steady RPM and then let off to see what it does.
Start checking all wires/connectors up to the throttle body (IAC/TPS) to make sure good and secure.
I'd guess still has a MAF? Installed correct direction for airflow? Wiring/connectors all good secure?