boost gauge flutters and pulls crappy

00rs25 · Post by **00rs25** » Tue Jul 26, 2005 3:01 am

ok my car is a 92 ss auto sedan, it runs awesome... then it gets warmed up, when your in drive it idles very bad, jumps rapidly. the boost gauge reading in vacuum flutters really bad...... then you drive the car hit boost the gauge flutteres and pulls then stops puilling hard, soo you let off the gas then floor it again and it pulls strong. is this a vacuum leak somwhere? air flow meter? what would cause this?

irishsetter · Post by **irishsetter** » Tue Jul 26, 2005 1:37 pm

I would say a vacuum leak

vrg3 · Post by **vrg3** » Tue Jul 26, 2005 1:57 pm

How high does the boost level get before it stops pulling?

irishsetter · Post by **irishsetter** » Tue Jul 26, 2005 6:23 pm

I get 8 psi stock boost

vrg3 · Post by **vrg3** » Tue Jul 26, 2005 6:28 pm

I don't have an explanation for why it would stop pulling when on boost and then be fine again when you press it again, but the idle thing does sound like a vacuum like, as irishsetter says. You could try the starting fluid test to look for a leak.

When it stops pulling, does it just hold the speed? Or does it seem to be cutting fuel, basically killing the engine until speed drops?

00rs25 · Post by **00rs25** » Wed Jul 27, 2005 1:14 am

it kinda cuts fuel maybe it feels like. when you spray carb spray around the air box it runs better. but intake gaskets are good. ive sprayed it all over and its just by the ait box it makes it better. like around where it bolts the top to the bottom. dirty injector making it like this?

vrg3 · Post by **vrg3** » Wed Jul 27, 2005 1:33 am

When you spray by the intake box you're probably just enriching the mixture very slightly... That does kind of indicate some kind of vacuum leak.

Or maybe a bad MAF sensor? Have you tried cleaning the MAF sensor out?

I guess it could be a dirty injector or a clogged fuel filter or something. Have you tried changing the filter?

00rs25 · Post by **00rs25** » Wed Jul 27, 2005 1:46 am

i havnet tried the filter, good idea, how do you clean a maf?

vrg3 · Post by **vrg3** » Wed Jul 27, 2005 1:48 am

There are a few different ways people suggest... The two ways I've done it are to gently spray it out with brake cleaner and to swish it around in a Ziploc full of isopropanol.

drftsub · Post by **drftsub** » Wed Jan 04, 2006 3:47 pm

I dont really have anything to help on this other than to say mine is doing the same thing, I have been searching for a while now to try to figure out what it is.

dzx · Post by **dzx** » Thu Jan 05, 2006 10:59 pm

rubbing alcohol and a q tip.

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boost gauge flutters and pulls crappy

boost gauge flutters and pulls crappy