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Make: Nissan
Model: Altima
Type: SE
Engine: 2.4L
Trans: Manual
Country Sold: USAOkay so I bought this car knowing it had a vacuum leak. I took it to the local mechanic and he said it needed an intake manifold gasket. I followed ETCG’s video on the whole process. Except for mine I decided to take the whole upper manifold off to change the gasket in between the upper and lower intake manifolds. Because I mean, I made it that far, why not? Anyways I put the whole thing back together and now I’m getting this loud vacuum leak sound, sort of like when you open a bottled soda for the first time but it’s continuous. If I don’t touch the throttle the car will misfire a few times and then stop within about 20 seconds.
I’m hoping someone on here has had this problem and fixed it. At first I assumed it was just a hose that I forgot to put back on. But I checked all my hoses and connectors. Everything is hooked up.
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Even though all the hoses are connected, it’s possible you might have damaged one during the repair process and not noticed. Rubber gets brittle after 14 years of engine heat.
best way to find vaccum leaks is to take a can of brake clean and spray it around all the vaccum lines when u hear a change in idle or the sound disappears you found the culprit
I checked the hoses by eye. Found 2 that were dry-rotted. Replaced them but it’s still making the same noise. I will check again on my next day off using carb cleaner. I will update soon.. hopefully.
Okay everyone. I tried my best to find a vacuum leak but I couldn’t find it. The more I start up the car the less I think it’s a vacuum leak and more of a compression problem.
Does anyone have any ideas what could cause my engine so suddenly lose almost all it’s compression in cylinder number 1. And if so, how do I fix it.
Have a shop perform a leakdown test if you do not have the equipment to do it yourself. It isn’t hard to do, but requires a leakdown testing apparatus and an air compressor. The leakdown test is better than a compression test because if there is a loss of compression, this test will help reveal where the compression loss is occurring (head gasket, valves, pistons, etc). Are there any other symptoms? Running hot? Smoke or steam in exhaust? Unusual noises? Unusual smells? Anything else that may be significant?
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