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Just got back to the car. Currently doing visual check on the hoses. After that, I will do the Carburetor Cleaner method.
With this method, as not to miss anything, what area or point MUST I spray to test for leak?
What would be advisable, the spray or the stream with the little red can spray hose?
Thanks
* * * * Season Greetings To You All * * * *
You must check all the parts that can leak. All the parts, including mating surfaces, hoses, pipes, and gaskets between the MAF and the intake valves. Include intake pipe, PCV connections, TCV lines, turbo couplings, charge air pipe, throttle pipe, throttle body gasket, intake manifold gasket, injector o-rings.
Everything subject to vacuum.
The direct stream with the tiny tube.Quote:
Originally Posted by Oka
Traditionally, if you used a spray (usually carb cleaner) to detect vacuum leaks, the vacuum leak when sprayed would cause a change in the idle speed. Unfortunately with newer systems (1983+Volvos) the idle speed is so well controlled with the engine control unit you may not be able to notice a change when you spray an area where there is a leak. However if there is a leak in modern systems (96+) you will get a fuel trim code after driving for a while.
If you have a torch, propane, acetylene or map gas run that around the vacuum lines and connections(unlit of course) and the idle should pick right up as you approach the leak. Then pin point with carb cleaners small hose.
Hello folks, Season Greetings to you all!
Was just getting ready to start the trouble shooting when office priority work came up. Would be back to it, hopefully coming weekend.
Thank you all.
Hard to test this way are the far reaches of the vacuum system called EVAP, located in the rear above and behind the fuel tank. A leak here is better pinpointed by doing a pressurized smoke test, sometimes using fluorescent smoke.Quote:
Originally Posted by Astro14
The fluorescent smoke test I see are for the AC system and not for an engine leak. Would you have any link to share?
The fluorescent smoke tests I saw are for the AC system and not for an engine leak. Would you have any link to share?Quote:
Originally Posted by pbierre