aftermarket intake manifold

[quakeroats11]

Ive got a aftermarket intake manifold on my 420a and when i crank the car it revs about 2000 rpm or more it ran fine before i put it on please help

 

[jericho777]

You could always put the original intake back on and see if the problem goes away. Then diagnose where the problem is between the two manifolds.

 

[psycho]

Sounds like a vacuum leak.

 

[Locke]

Vacuum leak.

 

[boosteclipse]

+1 on a leak.

 

[bullettdsm]

Vac leak, throttle cable tight, rest ECU and let it learn, clean the throttle body (pintle area). There's a few.

MB

 

[gudz519]

whats the best way to check for a vacuum leak?

 

[Fotowntalon]

you could buy a vacuum gauge for about $15 at autozone, and hook it up and compare the readings to the haynes. Or (which you will have to do anyways if you do have a vacuum leak) spray i think its carb cleaner around the IM with the car running and see if the idle changes. If it does, its sucking up carb cleaner, so you have a space or leak somewhere. Spray around to narrow where the leak is so you can fix it. More than likley you forgot to reinstall a gasket, or didnt tighten things down right.

 

[rlacasse1]

check to make sure you reconnected all vacuum lines

 

[glowryder]

u could get some non-flammable brake cleaner, and spray around gaskets, when engine boggs/sputters uve found a leak... ive had my TB gasket leak several times.. rtv or copper gasket spray those gaskets...

 

[Kyle97-clipse]

I'm kind of having the same problem my car seems to rev a little high when I start it. I hooked up a vacuum gauge though and it showed no sign of a leak as the vacuum was good.