Annoying hesitation, like a quick dead spot around 1500-2000rpm only on a light throttle application. No vacuum leaks, no boost leaks, no codes. Cleaned the TB also.

I noticed it goes away when I do the throttle plate adaptation, works fine a minute or so. Then comes again.
Should I try new throttle body? Any advice?

Cheers.

 

I have the same thing, I have read several similar posts an not seen an answer yet. I have done quite a bit of data loging and can't identify the source. Let me know if you find it

 

It's weird it goes away after the TB adaptation, it must be an electrical issue. I replaced the accelerator potentiometer as well, no joy.
Maybe I just try another TB. Anyone tried to swap TB trying to solve this?

 

Are you running the stock air box?

 

your the 3rd person describing the same issue... put the stock tune back in and see if it goes away... don't get on boost... sometimes mafless and big injectors do not go well together. Do you have a 74 mm IPD plenum?

 

I also have a hesitation at highway speed, in 4th/5th/6th getting back on the throttle for light accel.


ipd 84
997tb
catless 3 inch
mafless

 

irs most likely a combo of the ipd / Tb and mafless tuning. Most likely it doesn't matter who tunes it as long as it's mafless it's the problem. If you have a maf file I would try that

 

My car is running the MAF. It did it before i installed the COBB OTS and with all the custom Sambo tunes i have. My hiccup I like to call it, happens way before there is any boost. It happens in the same throttle pedal position of about 1/16 regardless of RPM. Every time do something like load a new map,. E-Gas reset or disconnect the battery it almost completely goes away then slowly creeps back.

 

I am also having this issue but did a pressure test and found that my Venturi tube has a small leak in it. When I was doing the test another hose broke free at 20psi. I ended up lowering the motor a bit and got to the Venturi with a bit of super glue to just hold it (there's a hairline crack in it). Took out the y pipe and zip tied a bunch of fittings. Got it all back together and no hesitation. It has since come back but I was boosting to 1.0 getting on the freeway. I'm just waiting for the new part to install to be 100 percent certain.

If you haven't checked boost leaks it would be a good idea but I'm sure most have already done that. Pick below is the Venturi tube to the right of the diverters.

 

Most likely the big tb and ipd

 

No big TB or plenum for me. I found a boost leak (FPR vac line blown off) and repaired it. Thought that would be it but no joy. No boost leaks last several times i have checked.

 

So would that be a replace??? What does something like that cost. I heard the IPD/plenum is not so much fun. ? Before I got tune and changed exhaust there was no hesitation. Could it be the combo of exhaust and tune. Or do you think that plugging the maf back in with the Kline decatt will solve the problem????
Thanks

 

You can try your stage 2 OTS map and plug the MAF back in. The only issue with that is the MAF will help mask and clean up the issue you likely have. Still We have MAFless cars from 500 to huge hp no issues. I think something is off and changing that venturi valve will be a good start u. I am here as usual for you.

Then if anyone has my set up try to log it happening and feel free to send over. There are too many cars that run fine to blame the Cobb MAFless but we can work together to figure it out

 

I'm no expert and it might not be what you're experiencing but 1500-2000 rpm is pretty low operating range. My car doesn't do much until I get up to 2500 rpm. My 944 is the same way.

 

No prob. I'm not blaming I'm gonna replace that faulty part. I'm almost sure that's it cause when the glue was holding the hesitation went away. I just wish I could get my hands on one asap.

Thanks my friend.