1J has a few problems

[chuckmuska2005]

I just got my MAP sensor to finish my swap and installed it with my ssqv bov; also hooked up my boost gauge and noticed two things that were a little odd when she started.

1. rev'd a lil high.

2. the boost gauge said that I was at -20psi; so like 20 on vaccume.

what can I do to correct this??

 

[4U2QUIK]

i think -20 is close to normal isn't it?

 

[Pernilongo]

I just got my MAP sensor to finish my swap and installed it with my ssqv bov; also hooked up my boost gauge and noticed two things that were a little odd when she started.

1. rev'd a lil high.

2. the boost gauge said that I was at -20psi; so like 20 on vaccume.

what can I do to correct this??

Idled high or revv'ed high?

I have -23 vaccum at idle. Isn't it normal? why do you think it needs to be corrected?

 

[chuckmuska2005]

Idled high or revv'ed high?

I have -23 vaccum at idle. Isn't it normal? why do you think it needs to be corrected?

I don't know what the normal vaccume is. I ment to say idle high.(been a long day lol!)

 

[chuckmuska2005]

So vaccume is normal. that's good.

 

[Pernilongo]

I don't know what the normal vaccume is. I ment to say idle high.(been a long day lol!)

Well, how high? does it keep doing it? i have the same problem.

 

[chuckmuska2005]

yea, I'll start her up, drive it around and when I go to stop it still idles high and feels like it still wants to pull.

 

[aphxero]

Throttle cable have any tension? You shoudl have slack.

 

[chuckmuska2005]

throttle cable has some slack.

 

[kanji1jz]

you have a vacuum leak somewhere. that's a typical cause of a vacuum leak. start the car, let it run, and listen under the hood for and type of air leak, probably around the intake manifold near the vacuum lines. if it's not there check ALL your intercooler piping faseteners, but it should be post throttle body. and the vacuum thing is normal. the -20 is normal at idle. you don't have positive psi until you give it gas. let us know what you find.

 

[Mischief7m]

vacuum is normal, it should jump up if you just rev it. but it likely wont pass 0. you need a load on the engine in order to really build boost.

 

[chuckmuska2005]

Ok, here's what I got so far. I found two vaccume line off the intake manifold one that goes from between the valve covers and the intake manifold towards the firewall where it T's into this other vaccume line that is from the hard line on the back of the intake manifold. These to lines come together and go straight to this check valve and then to atmosphere. I know that's alot of imagination to put together but I'll throw up a picture shortly. Thanks for your help guys!

 

[Dr Tweak]

Yeah you don't want any vacuum lines open to atmosphere, that's probably you're high idle right there. Also 20 inHg is a tad low, which also points to a vacuum leak.

-Doc

 

[chuckmuska2005]

Here's the photo's I snapped.

 

[Mischief7m]

20 is low?

i idle at about 20, maybe a hair below.

if i let off the gas underway, i get 27-28 in/hg.

which...now that i think about it, sounds like vacuum leak haha.

 

[tlo86]

make sure your P/S vsv is hooked up, if you dont have one the vac line from before the TB should be capped off not connected to the rest of the system because it will allow extra air in and cause a higher than normal idle. ive seen it a few times where people just bypass it and connect the vac line from before the TB for the p/s to the one after but its like having a hole in your throttle plate

 

[chuckmuska2005]

make sure your P/S vsv is hooked up, if you dont have one the vac line from before the TB should be capped off not connected to the rest of the system because it will allow extra air in and cause a higher than normal idle. ive seen it a few times where people just bypass it and connect the vac line from before the TB for the p/s to the one after but its like having a hole in your throttle plate

Very good point! I remember that plastic tip to the p/s line before the throttle body being broke off and unconnected. Will fix that issue. Do the pictures I have posted look correct as to how they are connected?