[Q] Acceleration Studder

[SicMSP03.5]

Hi all, So when im accelerating pretty fast but not WOT, roughly around 80% open my MSP likes to studder kindve. I dont hit a wall like fuel cut because I can actually WOT and it still accelerate just fine. Its kindve annoying because acceleration should pull smoothly. My AFR does blink at me and shows 10 which is most likely really rich.. I've got NGK R sparks (copper) and brand new duralast coils. I dont hear any boost leak, Im running roughly 9-10psi. Just trying to get some experience thrown my way. Thanks guys.

 

[polaris]

Could be the EGR. With these AFR issues your having, you could have some carbon build-up causing the valve to stick and/or impeding the flow, therefore causing fluctuations in your AFR.

 

[SicMSP03.5]

Sounds good I'll have to clean it out

 

[SicMSP03.5]

So I cleaned the egr valve and throttle body. Idle improved but I'm still getting that hesitation in boost around 7-8 psi.

 

[Preferio]

What are your plugs gapped at?

 

[SicMSP03.5]

.030 - .032

 

[hornsfan10609]

Do you have a piggyback afc or stock tune? Sounds like the rich tune doing it's thing.

 

[SicMSP03.5]

Nope no Just stock tuned

 

[rsvinylgraphics]

Could it be a dirty MAFS?

 

[SicMSP03.5]

I cleaned it with electronic cleaner

 

[rsvinylgraphics]

I cleaned it with electronic cleaner

Ok, and did you reset the ECU afterwards?

 

[SicMSP03.5]

Do you do it by pulling power from battery?

 

[rsvinylgraphics]

Yes you can disconnect the battery for a few minutes or pull the ECU fuse.

 

[SicMSP03.5]

Thanks, I cleaned EGR Valve, Throttle body and MAF. Seems to be quite a bit better. I think the rest is going to come from the SSAFC im going to order eventually. Appreciate the help everyone!

 

[lavishauto]

Maybe try some seafoam too to clean the inside of the motor out?

 

[SicMSP03.5]

Yeah I ran seafoam through the main vacuum line. She's got a little more pep in her step now.

 

[SicMSP03.5]

So I found 1 completely loose bolt and 2 other loose bolts on my exhaust manifold hopefully this is the culprit of my problems, only one could wish it's this easy. I will find out when wife gets home and I can take MSP for a spin.