Won't Stay rev'd at Low RPM and Slight hesitation....

[Rosco]

So I was messing around with my SR today trying to figure out a slight hesitation that my motor has always had. I checked my TPS and it reads 0.47 closed and 4.14 at wide open throttle. When I unplugged the TPS and started the car it only stays on long enough to hit idle and then the RPM's slowly go down and the car dies. My idle has also always been around 950ish (which I am told that it should be around 750ish). Giving the car slight throttle ( trying to REV it up to 2K and keep it there), it will REV down and oscillate between 500ish to 1000 and will keep doing that until I either let off or give it more than 1/4 throttle. While driving the car it will only feel like a slight hiccup before it comes under boost.

[Rosco]

Self Bump....

[david200095367]

maybe a vacuum leak?

[david200095367]

i just fixed my bros problem. he had a cut coupler and it would idle weird and sometimes die.

[Rosco]

I don't think it's a coupler.....I'm kinda baffled

[david200095367]

have you done a boost leak test?

[Rosco]

Not in a while, last time we did it held up to a little over 18 PSI.

[david200095367]

do it again. things can change very quickly.

[david200095367]

also try your maf. maybe its dirty.

[Rosco]

Okay MAFS is clean I cleaned that recently, also I checked my vaccuum lines for the BOV and they are as follows: The large pipe from the TB (throttle body) runs directly to the BOV. The smaller one next to it runs to the FPR and is T'ed off to the Boost gauge and the wastegate. I have no nipple on my hot pipe to run a seperate line for the wastegate signal line. Will this affect anything? Also is it possible that my TPS might have a "dead spot"?

I haven't performed a boost leak test yet, I will try to do that this weekend. If I did have a boost leak wouldn't it run rich throughout the whole RPM range? I mean my exhaust is invisible on startup and hard driving.

[david200095367]

you should use some of the nipples from the throttle body for vacuum sources. i dont like tee'n alot off the fpr. as with the dead spot im not sure. someone else will have to tune in here and help. but you could always try swapping with a friend and testing it out.

[Rosco]

you should use some of the nipples from the throttle body for vacuum sources. i dont like tee'n alot off the fpr. as with the dead spot im not sure. someone else will have to tune in here and help. but you could always try swapping with a friend and testing it out.

LOL I meant nipples off of the TB. I'm going to try switching out ECU's and MAFS. I currently have a Mines tuned ECU with an SAFC and a Z32 MAFS. I figure I'll put everything back to it's stock form and see what happens.