vent BOV or recirculate?

[bwlknsn91]

Is it possible to relocate the MAF on the stock piping? And if so, how far away from the throttle body does it need to me?

 

[JDMazdaFamilia]

I don't think you can. I've never seen the stock smic piping but I'm assuming its sucky spastic. You need something hard to clamp a coupler on. Ideally you want the maf 1ft away from the throttle body

 

[bwlknsn91]

I don't think you can. I've never seen the stock smic piping but I'm assuming its sucky spastic. You need something hard to clamp a coupler on. Ideally you want the maf 1ft away from the throttle body

Damn, that's what I thought. I'm having idle problems and try to figure out possible cures but I don't really want to buy hardpiping for the SMIC when I plan on eventually upgrading to a FMIC.

 

[JDMazdaFamilia]

What are the symptoms? Have you checked for a vacuum leak?

 

[bwlknsn91]

What are the symptoms? Have you checked for a vacuum leak?

Yup, both vacuum and exhaust but only found a small leak coming from one of the missing studs in the exhaust manifold. And I just recently replaced the wastegate actuator and vacuum line.

 

[JDMazdaFamilia]

Did you do a smoke test on the vacuum lines? Did you check for any leaks around the maf area? Do you have a cel?

 

[bwlknsn91]

Did you do a smoke test on the vacuum lines? Did you check for any leaks around the maf area? Do you have a cel?

Didn't check any of the vacuum lines, but did it throught both the exhaust pipe and into the exhaust manifold from the o2 bung. And no, I didn't check the MAF area for leaks. I've just noticed that while driving and when I left off the gas, the car bogs and I can hear a whistling noise. As for the cel, it will come on and off for a couple days at a time but haven't checked it.

 

[mazdaspeedp]

Didn't check any of the vacuum lines, but did it throught both the exhaust pipe and into the exhaust manifold from the o2 bung. And no, I didn't check the MAF area for leaks. I've just noticed that while driving and when I left off the gas, the car bogs and I can hear a whistling noise. As for the cel, it will come on and off for a couple days at a time but haven't checked it.

I think the whistle is usually from a stud or 2 missing from the exhaust manifold

 

[bwlknsn91]

I think the whistle is usually from a stud or 2 missing from the exhaust manifold

Right, and that's exactly what I have going on. Is that enough to mess with the idle though?

 

[float_6969]

It could effect the idle in that if the leak is drawing air into the exhaust manifold, it would make the O2 sensor read falsely lean, which would cause the ECU to richen the mixture up to the point that it could effect idle quality.

What's more likey is that you have a vac leak somewhere and it's running too lean and causing the hesitation.

 

[bwlknsn91]

It could effect the idle in that if the leak is drawing air into the exhaust manifold, it would make the O2 sensor read falsely lean, which would cause the ECU to richen the mixture up to the point that it could effect idle quality.

What's more likey is that you have a vac leak somewhere and it's running too lean and causing the hesitation.

After I replace the studs/bolts in the manifold I will try and smoke all the intake piping and see if I find any leaks that way.

 

[JDMazdaFamilia]

Easiest way is to hook up smoke to the port on the very top of the intake manifold where the vac line to the cruise control hooks up. I can almost bet that that's gonna be your problem. When you let off the gas is when vacuum kicks in. If you have no hesitation while your foot is on the gas, only when you let the gas go that's gotta be your problem.

 

[mazdaspeedp]

Right, and that's exactly what I have going on. Is that enough to mess with the idle though?

I think if its missing bolts it could affect ur idle. I would pull of the exhaust manifold and replace and rusted studs. Also replace the exhaust manifold gasket. Than just buy a vacume line kit from crossover and replace as many as u can there probably all dried and cracked anyways if u still got the stock vacume lines. How many km does ur speed have?

 

[bwlknsn91]

I think if its missing bolts it could affect ur idle. I would pull of the exhaust manifold and replace and rusted studs. Also replace the exhaust manifold gasket. Than just buy a vacume line kit from crossover and replace as many as u can there probably all dried and cracked anyways if u still got the stock vacume lines. How many km does ur speed have?

Yeah, that probably needs to be done anyway since it looks as though it's never been updated. And my car has just hit 100,000 miles, so according to google about 160,000 km lol

 

[Cleverfrog]

Easiest way is to hook up smoke to the port on the very top of the intake manifold where the vac line to the cruise control hooks up. I can almost bet that that's gonna be your problem. When you let off the gas is when vacuum kicks in. If you have no hesitation while your foot is on the gas, only when you let the gas go that's gotta be your problem.

the msp has cruise control????!!!!

 

[bwlknsn91]

the msp has cruise control????!!!!

Lmao, exactly what I was thinkin!

 

[JDMazdaFamilia]

Woops, sorry everyone. My fs has cruise control.. Pretty much off any vac line that routes to the engine works.

 

[bwlknsn91]

http://www.velocityfactor.net/scripts/prodview.asp?idproduct=1360

Anybody think this will have any positive effect for my bad idle?

 

[Spiced MSP]

without recirculating a bov, your car will stall. Unless your MAF is relocated.

 

[bwlknsn91]

without recirculating a bov, your car will stall. Unless your MAF is relocated.

So it's a no-go if I'm on stock piping?