Tip & How-To about Chevrolet Impala

All cars and trucks,vacuum lines,heater contros

Any time you have a vacuum problem,even EVAP diagnosis.
An assistant who smokes can be a valuable tool.
One person blows smoke(cigarette,cigar,pipe) Into the feed line (engine off) the other watches for where the leak is.
Works suprisingly well.

Posted by on

Cars & Trucks Logo

Related Topics:

Related Questions:

1 Answer

2003trailblazer code p0440 evap system changed the evap purge valve/control solenoid and still same problem

Testing the system an not replacing parts is the way to find the problem . Without knowing how ,using a factory diagnostic flow chart to go by would be best for a rookie .
System Description
The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge valve OPEN and the EVAP vent valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or the vacuum level decreases too rapidly, this DTC sets.

Conditions For Setting the DTC
The EVAP system is not able to achieve or maintain vacuum during the diagnostic test.
Diagnostic Aids
• To help locate intermittent leaks, use the J 41413-200 Evaporative Emissions System Tester (EEST) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the J 41413-SPT High Intensity White Light.
• A temporary blockage in the EVAP purge solenoid, purge pipe or EVAP canister could cause an intermittent condition. Inspect and repair any restriction in the EVAP system.
• To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with theJ 41413-SPT .
• Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
• For intermittent conditions refer to Intermittent Conditions .

Inspect the EVAP system for the following conditions:
• A loose, missing, or damaged service port schrader valve
• A loose, incorrect, missing, or damaged fuel fill cap
• A damaged EVAP purge solenoid
Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
Inspect the EVAP system for the following conditions:
• Any disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses
• A damaged EVAP vent solenoid or EVAP canister
Did you find and correct the condition?

Smoke testing the evap system to find the leak would be your best bet .

Oct 07, 2017 | 2003 Chevrolet TrailBlazer

2 Answers

Which is one of the best way to get real experience of smoking? Suggest some good ideas.

There are a variety of ways that one can use to get real experience of smoking. I know some of the things that people generally go for. They are -
1. Cigars.
2. Cigarettes.
3. Water Pipes.
4. E-Cigarettes.
In which I mostly prefer to use water pipes that provides me with the best smoking experience to get the best detailed knowledge for smoking. This provides you with the best option of smoking tobacco through water pipes and leaves you with its taste in your mouth for a longer period of time. You can also get more detailed knowledge on it from Online Head Shops which provides you with the best quality water pipes at really cheap rates.

Dec 23, 2016 | Cars & Trucks

1 Answer

I would like to know what makes that the Jeep smoke after rearranging the vacuum lines is it the EVAP system on HBO or the engine vacuum lines vacuum lines

the book is free,
and real
and posted here over 300 times, search much.
all that is covered in the SM. (how to put it back as it was new)

no clues as to what the smoke is.
or where it emits from. (tail pipe end)
white smoke or black
black is rich running.
white can be burning oil and smells like burning oil (lingers)
white can be steam,aka, antifeezes burning, goes the vapors dont linger like oil smoke does and smells sweet, unlike oil smoke.

EVAP is only FUEL vent , fumes. gas fumes.
there are lots of vacuum lines
to engine
brake booster
the engine hood sticker covers the majors, (smog related, )

SM , serv. man. click WK and read.


Dec 11, 2016 | Jeep Cars & Trucks

1 Answer

how to repair air leak behind wheel well ear. light is on. have traced to this area

Well if you can not locate this with your Ear.... and find the correct position of it. All is going to have to be done in an inside air free environment and do a smoke test by blowing cigar smoke it threw that specific line looking for smoke coming out of the line in question while also moving it in every direction while smoke goes threw it. This is truly for a person that loves a good Cigar of course HA HA. But a garage will do it fairly cheaply as well,or you can do with a cigar producing a lot of smoke in the same general area just moving it around what you think is the suspect vacuum line. The engine compartment will be much harder as the engine fan will disperse the smoke rather quickly. Remember to rate my solution and give testimonial this is how i earn my achievements here in FixYa Thanks in advance.

Apr 26, 2012 | 2004 Jeep Grand Cherokee

Not finding what you are looking for?

554 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

76630 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8499 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions