GMAN8

https://youtu.be/uzChytEzQ8w

Low end power loss. Car dies when attempting to drive. Please watch the video, I've checked all vacuum lines and injectors are seated properly. Dead engine? Any input is much appreciated

Loki

iTrader: (1)

Does it restart easily?
Could be many things, check fuel trims at idle via OBD, and if they're not zero you have a vacuum leak. What intake do you have? Is the car stock otherwise? When was ignition last replaced?

Also don't rev it out in neutral like that, it's not great for the engine.

GMAN8

AEM Intake, Magnaflow catback, BHR Midpipe. Brand new ignition spark plugs, BHR Coils with 5k miles. MSD 8.5 Wires, I replaced the fuel injector O Rings and the fuel rail insulator nozzles broke in the process, replaced that part. I cleaned the grounds ontop of engine also replaced the SSV to updated version with long bolt on top. Now the engine sounds like a lawn mower at low rpm, won't drive without stalling at a stop I don't have a gas leak or can hear a vac leak. I will reply again when I plug the obd in for the trim in a moment

Also the car does restart everytime i stall no problem

GMAN8

https://youtube.com/shorts/koFeMa9GgVY?feature=share4

Obd is an older, still posting for visual don't think it has the trims data

Loki

iTrader: (1)

The trims data is the last 2 entries on the first page in your video. This is weird at 900 rpm your airflow is 7+ g/sec, which is too high, the engine doesn't pull that much, but your short term fuel trim is making up for it with -20% trim to give good afr (1 lambda). I think your MAF is lying, and eventually short term fuel trim runs out of allowed adjustment (-25% max), causing it to lean out. I don't like throwing parts at a problem but try a new MAF?

GMAN8

Swapped MAF to O Reillys part not OEM but here is a longer vid showing fuel trims

When I give it gas it just eventually dies. I didn't touch the gas at all in the video, I messaged a local rotary master tech here and he said it's only running on 1 rotor

GMAN8

I do hear a vac leak somewhere in the ssv, fuel injector area. When I manually move the SSV lever the car will increase revs and just die. Going to remove UIM and check connections are correct for the injectors

Loki

iTrader: (1)

Hmmmm running on one rotor would make some sense. Your engine load at idle is 60% which is very high, and you're flowing more air through the MAF than you should for that rpm, so the engine is struggling to overcome some extra drag. It doesn't sound like it's one one rotor though, but what you can do is pull the spark plugs and see what they tell you (covered in gas? Oil? Soot?), and make doubly sure each coil routs to the correct spark plug. Mixing them up is easy and can cause weird problems.

I don't think you have a vac leak because the trims are reducing fuel to meet the AFR goal, not increasing it to account for extra air entering the system. But never hurts to check I suppose. Be sure to look under the throttle body for the VFAD nipple if your car came with one (depending on what year automatic it is, it may not have).

GMAN8

@Loki Wanted to update you. Rotor 1 primary and secondary fuel injectors plugs were crossed caused the rough running. It's fixed now.

BigCajun

iTrader: (1)

Appreciate the update.
👍