Questions tagged [vacuum]

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how to get a toyota sieanna rpms down

replaced the spark plugs , wires and the plennam gasket on a 2000toyota sieanna and now running at 2000 rpms.i tried to find a vaccum leak , but no ,luck.I am wandering if i need to relearn this high ...
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1answer
30 views

Troubleshooting low engine power uphills

my 02 Corolla (230k miles) has low power, especially uphills. I did a vacuum test and fuel pressure test, as I was suspecting a clogged exhaust or a faulty fuel pump. Both readings are normal, ...
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0answers
242 views

Tracking Down Excess Crankcase Pressure

So a problem I've been putting off dealing with for a long time is the excess crankcase pressure in my 99 Nissan Almera 1.6L. You can see here in the air box the results of this excess pressure: ...
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2answers
206 views

Giulietta High LTFT & Low manifold vacuum

Im currently trying to get to the bottom of an issue with High long term fuel trims (+20-25% give or take) which is showing my car appearing to be running extremely Lean, struggling with this as the A/...
2
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1answer
101 views

Does any one know what this part is called?

I have 2007 Chevy Aveo and I need to replace this part but don't know what it is called. It's a "t" square that water runs through one part and air through the other and connects to the throttle body
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1k views

Volvo s60 Engine Service Required

Engine Service Required message has just came up on the LCD and I'm wondering what could be the problem. My known issues are: I have the popping noise in the engine and I've tried the same thing as ...
2
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1answer
3k views

2004 Volvo XC90 Vacuum assist pump nightmare

My 2004 Volvo XC90 T6 2.9 has a Vacuum assist pump for the brake booster that should only come on briefly when the engine is cold and then not come on anymore. Mine comes on periodically all the time, ...
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0answers
56 views

1996 Chevy G10 - Where Does “Hard” Vacuum Line Go?

I was attempting to replace the vacuum check valve in my 96 Chevy G10 with 5.0 V8 and approximately 144,xxx miles. The check valve has three fittings, the two opposite each other were "soft" 7/32" ...
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2answers
990 views

Where is the TVSV valve located in a Toyota Tercel 1987?

My car is a 1987 Toyota Tercel DX Wagon 1452cc 2bl manual driven car. It seems now it doesn't have a TVSV, Thermostatic Vacuum Switching Valve. I need it to activate the AAP Pump and the Choke Pull ...
2
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2answers
1k views

What is this part of my Carburetor ? And what does it do?

My car is a 1987 Toyota Tercel DX Wagon 1452cc 2bl manual driven car. Carburetor of it is a Aisan 14120 Two Barrel carburetor. I have removed the carburetor of my car for repair. I know all the ...
4
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1answer
191 views

2008 Ford Focus 2.0 Zetec, wont rev higher then 4000 (redline 6.5), white smoke out the exhaust when petal is released

So about 500 miles ago I got a fresh oil change, new thermostat, new belt and new coolant. About 3 weeks ago I drove the car and it was fine, we parked it in the garage for as we where only needed to ...
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2answers
2k views

Manifold vacuum vs performance

I've been reading around looking for data on how to interpret manifold vacuum. Why? Well, my original thought was that 0.0hg meant that there was no restriction in the intake system and would mean you'...
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0answers
14 views

How do i find a vacuum leak in an 02 aurora oldsmobile [duplicate]

How can I find a vacuum leak in this car? I can't seek to find a diagram of the vacuum system anywhere.
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1answer
787 views

High vacuum pressure on idle after timing gear and chain replacement

I just got my 1980 Chrysler LeBaron 318 V8 back from the mechanic, who replaced the timing gears and chain, which were the originals and very worn. Soon after leaving the mechanic, I noticed my ...
1
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1answer
763 views

OEM brake booster vacuum line replacement

While doing some emissions testing on my '96 Mitsubishi Eclipse, I noticed that the vacuum hose from the intake manifold to the brake booster was cracked and decided to replace it. The OEM one has a ...
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0answers
233 views

Honda NX 250 Carburetor vacuum pipes

I'm building up a 250cc grass kart, and I've bought a Honda NX 250 engine for it including a ignition system and carburetor. It is a single cylinder 4-stroke DOHC, simple ignition with 1 magnet on a ...
3
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1answer
402 views

Testing and diagnosis for hissing sound only in forward gears 2000 Toyota Camry-LE

I have a 2000 Toyota Camry LE, with 147,000 miles on it. At present, when sitting at idle with the transmission in park, neutral, or reverse, there is no noise, everything sounds normal. When the ...
7
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2answers
2k views

What problem does a negative vacuum reading indicate when blipping the throttle?

I was doing a vacuum test on my 99 Nissam Almera 1.6 ( GA16DE engine ) to kind of get an idea how the engine is doing after I homebrew seafoamed it, and when I blipped the throttle the vacuum reading ...
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10answers
91k views

How can I detect vacuum leaks without access to a smoke machine?

In the course of helping my friend sort out a lean condition with his Mercedes GLK280 we have to pinpoint the source of a vacuum leak in the intake plumbing. The interwebz tend to recommend having ...
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3answers
6k views

How do I fix my Heater & A/C in my car, suspect vacuum problem?

I didn't see this question asked after a search so I thought why not. I have a 97 GMC Sonoma with 90k miles that I barely drive. Since the hot summer is coming fast I went to use the AC and I am ...
2
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1answer
489 views

No fluid under thermal sensor | '89 Jeep Cherokee reserve cooling system won't drain? | Car dies while running? & Car dies without running?

!importantclosed-cooling-systemcherokee-89laredo6-cylender4-liternon-startstalling I'm wondering if the vacuum went bad, or if it could be anything else? !PULL THE METAL LEVER UNDER THE VACUUM WHILE ...
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2answers
111 views

My Toyota fails under full throttle but not when feathered

My car is a Toyota MK4 NA Supra and it has a problem I don't understand. When I push the throttle gently, whether in park or in drive, it gradually builds revs and moves but when I push it hard i.e ...
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1answer
6k views

Leaking Fuel Injector Seal

I recently had to remove the fuel injectors and fuel rail to clean out the EGR ports on my Honda Accord. The EGR port was all clogged up with carbon build up. I replaced all the old o-rings, cushion ...
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1answer
1k views

Audi A4 (B8) safe to drive with vacuum leak?

Have a 2009 Audi A4 which has been running rough with the check engine light on, especially at idle for two days. The dealer described it as a large vacuum leak, and estimated ~$1000 to replace the ...
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2answers
5k views

HVAC blowing out of defroster and floor

1995 Chevy S-10 Blazer - 4.3 L Vortec V6 (vin W with PCM) - 230,000 miles original owner. I changed my IAC Valve today, and coincidentally, my HVAC started blowing out of the defroster and floor no ...
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2answers
275 views

How brake vacuum booster works?

If the brake vacuum booster makes vacuum on one side and the other is with normal atmospheric pressure, why doesn't it get sucked by itself towards the vacuum side? If the vacuum isn't enough to pull ...
2
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3answers
202 views

Needle Going Wild in Engine Vacuum Test

My '96 Saab 900S has multiple symptoms, and I suspect multiple problems. For one thing, it gets the error code: P0422 Main Catalyst Efficiency Below Threshold (Bank 1) I made a video of my vacuum ...
5
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1answer
2k views

Is vacuum line still necessary with manual locking hubs on an F350?

Several years ago, on my gas engine 2003 F350, I replaced my auto locking hubs with Warn manual hubs. Recently I am experiencing the dreaded A/C defaulting to the defrost vents under low vacuum ...
4
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2answers
718 views

Are there plugs for sale that are used to plug unused (thin) vacuum lines?

A bit of the background: I have a Mercedes that has a serpentine belt-driven air pump to help reduce smog in the exhaust. I heard this whole pump can be removed without causing any trouble, so I ...