aftermarket intake manifold

quakeroats11 · 10-30-2009, 01:03 AM

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 · 10-30-2009, 04:06 PM

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 · 10-30-2009, 05:12 PM

Sounds like a vacuum leak.

Locke · 10-30-2009, 11:29 PM

Vacuum leak.

boosteclipse · 10-31-2009, 12:14 AM

+1 on a leak.

bullettdsm · 10-31-2009, 08:45 AM

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

MB

gudz519 · 10-31-2009, 04:24 PM

whats the best way to check for a vacuum leak?

Fotowntalon · 11-01-2009, 04:17 PM

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 · 11-01-2009, 04:22 PM

check to make sure you reconnected all vacuum lines

glowryder · 11-01-2009, 07:49 PM

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 · 11-02-2009, 05:54 PM

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.