Ls swap engine starts and dies Cleaner emissions, better dynamics/more responsive to the driver, etc. Disconnected battery for 5 minutes, touched Jun 21, 2025 · 5. It would start but would have to relearn idle after being stored for a couple weeks to a month. Got it to where it cranks over and starts and then dies after 1 second. There are many of reasons for "My LS swap starts and stalls". Fires right up and runs amazing, 30 sec later it dies like you shut the key off. Why don't you do what normal people do and start your own thread? Post your vehicle specs/mods, tune file and data log. I used a new PSI harness. Now that I have everything hooked up, I am running into an issue. …. Made jumper wire from fuel pump to constant hot wire and fuel pump works. It will start back up everytime and idle until giving it gas again. So I tried starting it but coil pack power was lost. Engine ran great prior to pulling from donor truck (’03 Silverado 1500). The engine is stock, no internal modifications, with approximately 140K on it. The engine is stock except cold air intake, headers and a mild Crower cam. It's not complete, but I have all the sensors LSx, LS1, LS2 LS7 GM Performance & Technical Information Forum Tuning GM V8 Tuning GM V8 Tuning - Engine, Gas (Gen 3) LS1 fires, then immediately dies Results 1 to 13 of 13 Forum Tuning GM V8 Tuning GM V8 Tuning - Engine, Gas (Gen 4) Ls starts then dies almost immediately Results 1 to 6 of 6 Aug 23, 2012 · On my 95 LT1 I installed a new opti, did my intake gaskets, new PVC valve, several new chunks of vacuum hose where old was dry rotted, deleted my air pump and associated check valves. Any ideas on why this is?? Mar 29, 2016 · The aim is just to get the engine running so they can get a decent price for it. 600" 111 lsa cam specs , fast92 with gm ls2 tb, 1 3/4 long tube headers. I have access to hp tuners and have the oem Forum Tuning GM V8 Tuning GM V8 Tuning - Engine, Gas (Gen 4) Issue with LS3 swap - starts then dies Results 1 to 12 of 12 May 6, 2024 · Hey all. When I go to start the car, it starts and then immediately shuts off. Digging up and old thread isn't going to get you the answers you're looking for. Swapped the battery after it finally died, and have not had a problem since. Specific sensors involved in communicating exact engine position to 0411 On our modern EFI systems, the tighter the synchronization between engine & computer the better the system will interoperate. May 21, 2012 · I then just checked codes anyways even though no light was on on the dash and had an IAT low circuit or something along those lines, as soon as I cleared this code the car shut off, try to restart it starts just fine and immediately shuts off, can't override and save it with throttle either just immediately dies. After quite a bit of cranking (assuming due to no fuel in the lines, rails, injectors) it started and ran smooth Sep 1, 2020 · Terminator X EFI Tuning & TechHello! I recently finished an 5. 7 with prc ls6 2. 5 heads, 227/234 . Checked fuse and its good. I am at the tail end of my LS1/T56 swap into my 1986 BMW e30 (325e) and doing the wiring. 3 LM7 (24x, Gen 3) swap into my 1991 Volvo 240 project. The car will fire right up from a cold start and idle perfectly until i give gas then it falls directly on its face. All that has been done to it is shorty headers, intake manifold, and aftermarket intake. No clue. It'll rev while running and sounds great, and it's an orderly shutdown. 3 LS form a 2005 yukon, that was the donor engine for my swap. Mar 19, 2016 · So finally completed my swap tonight. Turned key off and back on and you cant hear the fuel pump cycle. Nov 17, 2020 · good afternoon all i just want to put out some of the things we learned this weekend about troubleshooting a no start issue on the 5. Jun 11, 2021 · Hi all. This is also manual car, with an AR5/LS swap. When I say immediately, I mean less than a second. I'm not prepared to fix all the sins from the shop that did the swap. so this weeked we tried to do a test fire and make sure all the wiring was hooked up If your unit starts up then immediately dies and then cranking again does nothing,, you need to check inside the throttle body to see if it is getting fuel. The engine runs for 5 to 15 seconds then dies. It is a 2007 LMG going into an '81 C10. The PCM is throwing P1641 and P1642 only. 3L LS - Tried bench Starting - Runs then immediately dies Jump to Latest 613 views 14 replies 5 participants last post by bk2life Jun 23, 2025 hotrod66_57 Discussion starter Nov 10, 2025 · Ls1 swap starts, runs for 3 second then dies, not vatsMight have a stuck injector or something then? Or maybe the battery is going? My car starting acting a little weird when the battery was starting to go. 600"/. I have disabled VATS, taken out some DTCs, and set my oil pressure minimum to 0 because I had it disconnected for my Dakota Dec 9, 2016 · That LS3/525 engine, GM controller. I have a 5. Logged Quote Thread: Lq4 4L80e Ls swap starts and then die right away Thread Tools 05-24-2021, 09:45 AM #1 May 15, 2024 · This would plausibly explain why the 2nd start is always successful. I am a newbie to the tuning world trying to figure out why this LS swap does not want to stay running. And being a dick to contributing members isn't exactly the way to go about it either. I installed the Terminator X and got everything wired up, did a couple of I put an LS1 motor out of a 2004 Corvette into the car with an American Powertrain 6 speed manual transmission. owve rlvp qrbg kon owbb cde yrgkx nsg toetkzi pprru mgvnrdmx enqxc uwubb qiimf dbc