Lm7 swap dies with throttle
Thread Starter
Teching In
Joined: Jan 2022
Posts: 7
Likes: 1
Lm7 swap dies with throttle Hello everyone, first post on here. My apologies if this is posted in the wrong place.
I’m doing an lm7 swap in a 240sx and having an issue I can’t seem to resolve.
idles great. Live data shows everything working. TPS is within range. Reads 0-100% with steady increase in voltage up to 4.5v
the problem is once you add any throttle it will die. Always comes back to idle well but any throttle input kills it.
fuel pressure confirmed 58psi. Throttle blade cracked open. IACV a bit high on the counts but shouldn’t cause it to not run at all with throttle.
no codes tripped.
wired as per lt1 swap. Triple checked pin outs, grounds and such.
2003 express van 5.3 engine
fast EFI 102mm throttle body
2003 Silverado computer 2003: Serv. No. 12576106 with Hwd. No. 12570558
1 changed to 0 in the system settings for etc
any advice would be very appreciated, really scratching my head with this one
thanks
I’m doing an lm7 swap in a 240sx and having an issue I can’t seem to resolve.
idles great. Live data shows everything working. TPS is within range. Reads 0-100% with steady increase in voltage up to 4.5v
the problem is once you add any throttle it will die. Always comes back to idle well but any throttle input kills it.
fuel pressure confirmed 58psi. Throttle blade cracked open. IACV a bit high on the counts but shouldn’t cause it to not run at all with throttle.
no codes tripped.
wired as per lt1 swap. Triple checked pin outs, grounds and such.
2003 express van 5.3 engine
fast EFI 102mm throttle body
2003 Silverado computer 2003: Serv. No. 12576106 with Hwd. No. 12570558
1 changed to 0 in the system settings for etc
any advice would be very appreciated, really scratching my head with this one
thanks
TECH Fanatic
Joined: Jan 2022
Posts: 1,034
Likes: 468
From: Seattle
Does it shift easily into gear from park? If it does, I'm guessing IAC issue. DBW or DBC?
some good thread to check out
some good thread to check out
Thread Starter
Teching In
Joined: Jan 2022
Posts: 7
Likes: 1
Does it shift easily into gear from park? If it does, I'm guessing IAC issue. DBW or DBC?
some good thread to check out
some good thread to check out
its a 5 speed manual swap. Drive by cable
Thread Starter
Teching In
Joined: Jan 2022
Posts: 7
Likes: 1
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Thread Starter
Teching In
Joined: Jan 2022
Posts: 7
Likes: 1
Just in case someone stumbles upon this thread ten years in the future, I won’t leave you hanging
I had mentioned to my tuner that I wanted the OS re flashed to something that was drive by cable. He tried to modify the existing file in the tune but couldn’t get it to work.
Re flash to a 2003 express van or a known dbc manual tune and it’s good to go.
the 102mm throttle body worked for me. Obviously I’ll need to fine tune it but it wasn’t the root of the issue. iAC counts make sense and it idles and drives well now
I had mentioned to my tuner that I wanted the OS re flashed to something that was drive by cable. He tried to modify the existing file in the tune but couldn’t get it to work.
Re flash to a 2003 express van or a known dbc manual tune and it’s good to go.
the 102mm throttle body worked for me. Obviously I’ll need to fine tune it but it wasn’t the root of the issue. iAC counts make sense and it idles and drives well now