2G Odd engine surging problem when warm

[Tyler Davis]

Hey guys, my car has been having this weird problem where when I am accelerating or holding the throttle in the 1500-2500 rpm range it starts to surge and jerk.it does not happen for the first 15 mins of driving but after 15 mins it does it consistently I’ve tried cleaning my IAC, changing injectors, changing my MAF, boost leak tested it. Has anyone else had this issue? It’s a DSM so I would assume so

Thanks

 

[Mello]

Sounds like a fuel problem to me. Is your O2 sensor in good condition & working correctly?

 

[Tyler Davis]

Sounds like a fuel problem to me. Is your O2 sensor in good condition & working correctly?

Yeah it sounded like a fuel thing to me too, I did replace the o2 and the coolant temp sensor as well

 

[DSMPT]

I would check the fuel pump, the fuel pressure regulator and all wiring/connections for MAF.
I don't know if this helps but here is my experiences.
I had an issue before that when the engine was cold ran fine but after 10-15 min like after the engine got the normal operating temp, the car started to act very weird. It was a bad fuel pump. The pump was working fine when cold but after 10-15 min pump went hot and stopped working as it should. Just replaced with a new and the issue was solved. And this is not with a dsm, with a motorcycle, it also had a very similar issue that if the engine was cold it ran fine but after the engine got hot the engine hardly revved up, like bogging. It was a bad fuel pressure regulator.

 

[Tyler Davis]

I would check the fuel pump, the fuel pressure regulator and all wiring/connections for MAF.
I don't know if this helps but here is my experiences.
I had an issue before that when the engine was cold ran fine but after 10-15 min like after the engine got the normal operating temp, the car started to act very weird. It was a bad fuel pump. The pump was working fine when cold but after 10-15 min pump went hot and stopped working as it should. Just replaced with a new and the issue was solved. And this is not with a dsm, with a motorcycle, it also had a very similar issue that if the engine was cold it ran fine but after the engine got hot the engine hardly revved up, like bogging. It was a bad fuel pressure regulator.

Thanks I’ll have to try that

 

[Vegas Smith]

It’s possible the ptu is overheating.

 

[Tyler Davis]

Seems like the problem has been fixed after a tranny flush, not sure if that’s good or bad , the guy I bought it from has definitely made me question what he was doing with the car thanks tho guys