Me and my boys did the MPFI swap on my dx, and now it revs to 5000 rpm when I start it. I don't touch the gas at all. It also smokes white smoke really bad out of the exhaust. Checked the wiring, and it's fine. Did the timing, and did a valve adjustment because the old head was cracked. Set it to TDC. Head gasket was changed the right way along with the intake manifold gasket. The head is of an si but it has a dx cam and gear on it. What else could it be? Any help is appriciated, thanks.

 

on the intake manifold, there is a coolant channel between the head and the manifold, check that out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bagpipe goatee &raquo;</TD></TR><TR><TD CLASS="quote">on the intake manifold, there is a coolant channel between the head and the manifold, check that out.</TD></TR></TABLE>

 

were

 

did a b16a swap and it did that, as soon as you start it up it would rev to the moon, turned out half the intake manifold gasket was gone. i'd check yours...

 

Were at?

 

my manifold gasket is brand new

 

Recheck your intake manifold gasket. It doesn't hurt to double check and even tripple check.

 

common on mpfi.. did you mix up the Green and yellow wire onthe TPS Throttle position sensor.... back left of the intake manifold.. the green should be on the top.. the yellow at the bottom, with i think the red in the middle

 

**** he's right nate i might have forgot to do that its sapposed to be green white yellow thanxs man i forgot so im bouts to check that for him today&gt;

 

when i did a mpfi swap, it turned ot that there was a vacuum line that i forgot to hook up. check that all lines are are hooked ap and that there isnt any vacuum lines leaking, or any holes in the intake manifold that need to be capped off.

 

Checked the TPS wires and they were right, gonna check all the vacuum lines today. Thanks for the help guys Anything else anyone can think of?

 

easy way to check for leaks is to spray brake cleaner/carb cleaner around the flanges you think might be leaking, your idle will rise when you find the leak, cause the spray is getting sucked in. might be a tad difficult in your situation, but a tip none the less.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by speeddave &raquo;</TD></TR><TR><TD CLASS="quote">easy way to check for leaks is to spray brake cleaner/carb cleaner around the flanges you think might be leaking, your idle will rise when you find the leak, cause the spray is getting sucked in. might be a tad difficult in your situation, but a tip none the less.</TD></TR></TABLE>

Dont u mean the idle will drop? Brake/carb cleaner tends to bog the motor out.

 

First thing that happened to me after my mpfi swap. It was like 2" of old gasket in the dizzy side that was still there!! So water was getting through. Therefore the white smoke.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fourthgenhatchB17 &raquo;</TD></TR><TR><TD CLASS="quote">

Dont u mean the idle will drop? Brake/carb cleaner tends to bog the motor out.</TD></TR></TABLE>
Not in small amounts.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast88std &raquo;</TD></TR><TR><TD CLASS="quote">

Not in small amounts.</TD></TR></TABLE>

Well it sure doesnt raise an idle, especially if u have such a huge leak thats gonna cause the motor to rev to 5k rpm.

I remember a friends car with a high idle at 2.5k rpm and the motor came down to normal rpm when i sprayed brake cleaner on the dizzy side of the intake manifold (obviously a vac leak).

 

if you spray a good amount it may bog, my experience has been a little will raise the idle. either way you still know you have a leak.

 

Checked my vacuum lines and my PCV is brkoen. I ordered a new one but they sent the wrong one. Im gonna check the manifold gasket tomorow and get the right PCV. (to much **** to do right now). I hope that will be the problem. Thanks again for all your help.

 

if you replace it, get one from honda. the autozone manifold gaskets do not always seal properly and use rubber to form the seal.the rubber actually caused me to break 2 manifolds off at that bolt by the seal. the honda ones have a crush washer in them and seal much better.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr. carpenter &raquo;</TD></TR><TR><TD CLASS="quote">if you replace it, get one from honda. the autozone manifold gaskets do not always seal properly and use rubber to form the seal.the rubber actually caused me to break 2 manifolds off at that bolt by the seal. the honda ones have a crush washer in them and seal much better.</TD></TR></TABLE>

b/s i just bout one from vatozone 2 weeks ago they have a crush washer just like the honda gasket

 

Check your throttle cable...

 

Removed the throttle cable and started it., and the same thing happens. Im lost. Oh and the motor sounds like a subaru, runs hella rough. im gonna go over it all over again for like the 52454635th time this week and check.

 

1) Make sure the butterfly on the throttle body is closed when you are not on the throttle.

2) Is it possible you crossed your tps wires when you extended them?

3) Any codes on the ECU? and what ECU are you running

4) What intake manifold gasket did you use, the b2 or the a6?

5) You said the old head was cracked, did you replace it and the head gasket?

Lastly, when you got your A6 intake, did you clean it? I had to spray mine with brake cleaner and engine cleaner to get all the crap out of it. If your PCV was bad your throttle would just bounce in between 750 and 2000, thats what mine was doing when my autozone pcv seperated.

Hopefully we can get your **** fixed.

 

Hell yea vegaskurt knows his ****...

 

The TB is closed when off throttle. No codes on the ecu. Runnin a PR4 right now. Used the a6 intake main gasket. And yes the head and gaket were replaced. I will check the wires once more when i have time(finals). Thanks 4 the halp guys hopefully it will be done and over with soon