Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [vacuum-leak]

18 questions
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Can a leaky vacuum hose cause a whistle when accelerating?

My car recently developed a lot of issues that I've been working through. It needed a new EGR valve and fuel pump. But I held back on replacing the EGR because I hear a vacuum leak and I guessed there wasn't a strong enough vacuum for the EGR to…
user875234
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Use compressed air to find vacuum leak?

I need to hunt for a possible vacuum leak in my 1999 Toyota 4runner. I've seen all the usual recommendations for this (propane, cigar, smoke machine, carb cleaner, soapy water.) Of those, soapy water seems like the lowest cost, lowest risk…
Cognitive Hazard
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Is propane test for vacuum leaks a fire hazard?

I have a vacuum leak somewhere along my air intake. I researched it and the best way to find it seems to be the propane test where you attach a couple of feet of hose to the nozzle of a propane torch and move it around to see when it starts getting…
amphibient
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I have a 1999 yamaha r1 and it bogs out really bad

So I've cleaned the carbs twice on this bike and its like it's not getting enough fuel because it will only run on starting fluid and I've cleaned the tank and got new hoses and still the same problem and now my start button wont work anymore?
Justin Millerrr
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Why my long fuel trim readings are higher than short trim ones?

My understanding of long trim vs short one is that the short trim readings will adjust the long trim after awhile right? For example my short trim readings are in the -5 to positive 7% max while the long trim will never ever drop below 10.9% and…
Flamenco77
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Oil / Coolant Leaking and Mixing. Low pressure. No CEL. Intake Manifold Gasget?? - '09 Chevy Malibu

Alright guys, the Malibu is back! Issue: Wife was driving. Oil pressure light came on. Pulled over. Car wouldn't start for next 10 minutes. Then started right up, and made it home (Light was gone). Symptoms: Oil: Yellow fluid in oil cap. Oil…
Dylan Cross
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Mk6 Fiesta erratic idle and poor throttle response when engine is warm?

I have a Mk6 Fiesta 1.4 petrol that's about 17 years old but has only done roughly 55,000 miles. It's currently experiencing issues that I'm having a very hard time diagnosing. To summarise the problems with the car - when the engine warms up the…
Jason
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Fuel tank pressure - leaking gases and gasoline

Hi! A pleasure coming to this site, hope I knew about it before! I own a VW Golf 4 R32 (euro), which from time to time, starts leaking gases and fuel from the fuel tank's cap. The amount of fuel leaking isn't too much, but the gases create an…
aran
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What is a valid range for Intake Manifold Pressure while driving on +60mph?

So today I was monitoring my car data and logging everything, when I was driving on the highway going +60mph and on ~2500RPM, my intake manifold pressure read +10Psi. I read it's usually near 5Psi. On idle, mine is around 5Psi. Is this normal?
Everyone
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Could a vacuum leak cause a drop in manifold absolute pressure?

I've been doing some reading and speaking to a mechanic trying to diagnose a hesitation and rough idling issue. I think I've ruled out a vacuum leak by spraying flammable gas around the seals and not noticing any change in behaviour. I'm seeing…
Gus Hogg-Blake
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Car starts for 47 sec and then slowly stalls and dies every time

I own a Nissan 300zx Z31 1985, a car which has been having the same recurring problem almost a dozen times now. I am usually able to fix this issue, however the fix is never successful permanently. This time I cannot fix the issue. The car runs and…
Trash Incarnate
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Excessive leaking from injectors

I changed the timing chain and tensioner in a 1.6hdi diesel, so twin camshafts has a timing chain and tensioner connecting them. The chain didn't break rather it slipped 5 notches. The repair seemed to go well. I put other parts back together. The…
Andy S
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Saab 9-5 (2006) engine lamp on - a loose hose found under the hood

When I start the engine of a Saab 9-5 (2006), the engine lamp is always on. I am not sure but I found two loose hoses. One of them I connected as shown in the image below. Could someone confirm that I did the right thing here? Then I found another…
Capo Mestre
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02 Escape still sucking air after new upper and lower air intake gaskets

I can hear it. Plus acceleration is slow and the EGR keeps going off. I have replaced the EGR with a junkyard one and it didn't fix the problem so I want to fix the vacuum leak before I spend money on a new EGR. I cleaned the whole area when I put…
user875234
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Replaced brake booster 1 1/2 years ago &this is the 2nd time now that when useing the break it makes a hissing noise &at times pedalsucks to the floor

Toyota Camry LE 4 Cylinder 2007. A year and a 1/2 ago I replaced my brake booster and ever since then (this is the 2nd time now) my brakes don't work very well they make a hissing noise when I apply the brake and at times the brake pedal will suck…
Amanda Loers
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