Blew something...help!

DTT92LX

New Member

Oct 28, 2003

185

1

0

Downingtown, PA

Jul 21, 2004

#1

• Jul 21, 2004

• #1

Hey,

Punched it yesterday and must've blown out something but can't figger it out...

Car is running really rough. At idle, in park, warm start, it revs at ~750 for 1 sec, then stumbles for 1 sec and keeps cycling that way. During the "stumble" period, I hear a hissing under the hood. Sounds like under the upper intake but can't really tell from where. Also, exhaust smells REALLY rich.

When driving, it sounds fine, haven't really pushed it to test for power loss.

any ideas guys?

 

DTT92LX

New Member

Oct 28, 2003

185

1

0

Downingtown, PA

Jul 21, 2004

#2

• Jul 21, 2004

• #2

Was just out listening to the hiss and it is definitely coming from under the upper intake. What is that tube that I can see from the front of the car that goes from the intake around back to head/block/somewhere?

 

shttygtstang

New Member

Jun 2, 2004

978

0

0

Jul 21, 2004

#3

• Jul 21, 2004

• #3

head gasket ????? do a compession test theres not much to go buy

 

DTT92LX

New Member

Oct 28, 2003

185

1

0

Downingtown, PA

Jul 21, 2004

#4

• Jul 21, 2004

• #4

That was my initial thought but saw on here that you should see bubbles in the radiator on a cold start if head gasket. Don't know how reliable that test is though...

Anyone know what that tube is?

 

J

Js5ohLX

Member

Apr 5, 2004

287

0

16

Ohio

Jul 21, 2004

#5

• Jul 21, 2004

• #5

Sounds to me like a vacuum line fell off or cracked.

 

Q

Quick5pnt0

Founding Member

Aug 21, 1999

1,208

0

36

north eastern PA

Jul 21, 2004

#6

• Jul 21, 2004

• #6

Js5ohLX said:

Sounds to me like a vacuum line fell off or cracked.

Click to expand...

I agree, you have to go out start the car and try to listen where the hissing is coming from. Its probably just a vaccum line that came off under the intake or something.

 

D

Daggar

New Member

Jul 19, 2004

3,902

5

0

Jul 21, 2004

#7

• Jul 21, 2004

• #7

You can start by running the engine then spraying some starting fluid around that area to see if the engine idles up. So long as everything is tight (meaning your throttle body out to your air cleaner etc.) then hearing the engine idle up is a sure indication that something is sucking that starting fluid in. If you don't get any change in the engine pitch (meaning that you don't have a vacume leak) then change your throttle position sensor. In that case, the sucking noise you hear is the motor trying to spin up and the throttle body not opening quick enough to keep up with it. You can also check this by disconnecting the intake hose from the throttle body then revving up with the throttle linkage. If you hear air being "sucked" past that throttle body then that's a pretty good indication that the sensor is whacked. That condition would also explain the rich fuel smell you're getting.

 

Whytry91

New Member

Nov 26, 2002

321

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0

Morrisville, NC

Jul 21, 2004

#8

• Jul 21, 2004

• #8

off topic, but I saw he was a new guy so I thought I'd spruce up his avatar.

 

D

Daggar

New Member

Jul 19, 2004

3,902

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0

Jul 21, 2004

#9

• Jul 21, 2004

• #9

hehehe... thanks... now is he not only a mindless killer, he's phsycho! lol

 

8

88mustangGT

New Member

Apr 6, 2003

298

0

0

Jul 21, 2004

#10

• Jul 21, 2004

• #10

defently a vacume hose poped off or cracked. it will cause you to run rich when that happens.

 

DTT92LX

New Member

Oct 28, 2003

185

1

0

Downingtown, PA

Jul 22, 2004

#11

• Jul 22, 2004

• #11

Just to tie up this thread...

Once the engine cooled off a bit I got my meaty paw up under the intake and found the vacuum leak. The hose on the left split at the nozzle. Its not the hose going around back the engine but the other, smaller, one going down to a box under the airbox. WOT module I think I've heard it called???

Thanks for the help.

 

8

89lxsport50

10 Year Member

Feb 25, 2003

550

5

39

Franklin Tennessee

Jul 22, 2004

#12

• Jul 22, 2004

• #12

The small hose on the front of the intake goes to your charcoal cannister. The large one that goes around back is the PCV hose.

 

DTT92LX

New Member

Oct 28, 2003

185

1

0

Downingtown, PA

Jul 22, 2004

#13

• Jul 22, 2004

• #13

What's the charcoal canister do? Can it get clogged, 'cause now that I reattached the hose, a very old hose mind you, it's collapsing slightly under the vacuum. Up at the intake end. I'll put a new hose on but I'm just wonderin' if I have other problems that I should consider... Don't think the hose should really collapse unless there's blockage at the canister end...