Question about 1990 Chevrolet Lumina

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Need vaccuum hose diagram

I have a vaccuum leak because it pings under load and when under full throttle aceleration the vents change their setting say from vents to floor. 90% certain this is a vaccuum leak but don't have a hose routing diagram. I tried the old tried and true can of carb cleaner with no luck.

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There will be one under the hood of the car... it is going to be small and maybe somewhat hidden but there will be one under there.... If not more information will also be needed... What size motor does this car have

Posted on Jun 04, 2010

Testimonial: "Correct info. Diagram is on the left strut tower."

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Posted on Jan 02, 2017

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VACCUUM HOSE LEAKS


Not over the internet
You have to know where all the hoses
go & resolve the issues
You should have engine vacuum diagram
under the hood
A shop can smoke check for vacuum leaks
& save you time there

Jul 21, 2013 | 2001 Ford Windstar

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Vaccuum hose routing diagram 4.3 liter engine 1995chevy blazer


should be under your hood on the edge where the radiator is there is a few diagrams there timing settings vacume hoses etc if they are gone just use your search engine on images intesd of web it will pop right up

Feb 02, 2013 | 1996 Chevrolet Blazer

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My 2000 dodge grand caravan 3.8 check engine light lit up and indicated p0134 oxygen sensor was replaced and light turn off 15 minutes later while on the road light turn on again put back on scanner now...


the codes for the oxygen sensors and egr valve dont neccassarily mean those parts are "bad". O2 sensor codes are usually caused by a different problem all together. There job is to monitor oxygen levels in the exhaust to make sure it is clean enough to meet emmisions standards. If you have a vaccuum leak, misfire, or a fuel problem those codes can show up. The egr valve recycles the exhaust gas in another attempt to clean the impurities. If the vavle was truley bad it would of affected the was the vehicle idled and drove on the highway. The egr activates when the throttle is depressed it opens at 1/4 of full throttle and closes at idle. Though they get pretty dirty the usually dont just fail under normal driving conditions. I would say that po171 code which if i remember right is a o2 sensor lean code, is showing now you have a tune up that needs to be done or a leaking intake manifold. A dirty or failed pcv valve can also cause that code because of it being operated by vaccuum from the engine. If any vaccuum is lost or restricted the hole combustion process will be incorrect.

Mar 10, 2011 | 2000 Dodge Caravan

2 Answers

Looking for a pdf. of vaccuum hoses on a 2000 focus


SPI Vacuum Diagram
spivacuumiy9.jpg

Zetec Vacuum Diagram

zetecvacuumtz6.jpg user_offline.gif SPI Vacuum Diagram
spivacuumiy9.jpg

Zetec Vacuum Diagram

zetecvacuumtz6.jpg user_offline.gif spivacuumiy9.jpg

Zetec Vacuum Diagram

zetecvacuumtz6.jpg user_offline.gif If it's equipped with the 2.0L SPI engine (eighth digit of the VIN is 'P'), the most common place for a vacuum leak on these engines, is from the PCV hose that runs from the valve cover to the back of the throttle body. Where it usually rots through is the elbow at the back where it connects to the throttle body. Hope this helps. The only place i could find any views is here. vacuum hose diagram - Focus Fanatics

Oct 29, 2010 | 2000 Ford Focus

1 Answer

I have a vaccuum leak and am looking for a diagram of the vaccuum lines. Where can I find one? Also, which vaccuum line would affect blower vents on the 03 expedition?


The easiest way to look for vacume leak it to go to the vents and back track to the vacuum supplier. somewhere you should to hear the vacuum leak somewhere. It amazes me how much of fixing cars is do by hearing and not seeing. Sometimes seeing can miss lead you. Let me know if I can help you and more.

Jun 21, 2010 | 2003 Ford Expedition

1 Answer

01 focus,2.0 DOHC ZT,Crapping out under acceleration or under load on hills,Changed fuel pump,Checked for vaccuum leaks,No codes no light,I have a streaming reader and everthing appears to read right.I am...


Under a load or uphill,would suggest that a high vacuum signal was involved. So think EGR Valve. I know you got no codes. This is an exercise in logic.
A misfire will present it'self going up hill or loading the engine. e.g. hard on the gas
What has no sensor or won't set a code easily. Vacuum leaks,air filter,all air intake ducting,MAF Sensor,Throttle Position Sensor and don't forget those really small EVAP Leaks,most people never heard of.
Is the converter partially blocked?
O2 Sensors switching properly?
Fuel pressure,under a load? New fuel filter?

May 28, 2010 | 2001 Ford Focus

2 Answers

Heater only blowing out defrost vents


Open your hood and find a "T" connector right near the battery. Follow the line down below the battery (you will have to get under the Jeep). You will see that the line plugs into a 3 to 4 inch section of 3/16" tubing that is plugged onto a black in color, plastic box. Use a razor knife and trim off about 1/2" of this 3/16" tubing as it commonly cracks where it fits on the nipple of the black plastic box. The vacuum cannot build pressure properly with these cracks in this tubing, and therefore cause the selector door to malfunction when operating heat and a/c. It is a quick and easy five minute fix.

Sep 04, 2009 | 2005 Jeep Wrangler

1 Answer

Ac not blowing on the front vents


The most likely cause would be a problem with the vaccuum source. Most vehicles use a vaccuum source from the engine, in order to control the Climate Control mode. The default setting is for the Climate Control is for it to return to the defrost mode when there is no vaccuum. I'll bet that there is a bad vaccuum hose is leaking or has become disconnected.

Aug 27, 2009 | 1996 Cadillac DeVille

1 Answer

Air doesn't come out front vents


look under your hood for any vaccuum leaks. check all rubber hoses under the hood. they should be roughly the size of your pinky.

Aug 08, 2009 | 2005 Ford Crown Victoria

2 Answers

2000 f-150 4.6 extended cab 4x4


hello costly guesses have the( iac) checked idle air control valve this controls air pass in your throttle body this is a little eletric motor it is spring loaded this has a pintle that extends into a seat internaly in the throttle body if the bore were it seats has carbon build up or varnish it causes it to stick and unable to go were it should be or when it suppose to retract it stays stuck on the varnish can cause rough idle stalling no starts power loss like vaccuum leak this is not that exspensive to install under a 100 goodluck

Sep 18, 2008 | 2000 Ford F150 Flareside SuperCab

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