Question about 1990 Chevrolet Cavalier

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Why will it run with the vacume line off the map sencor

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If the engine management system is working, the engine should stay running but perhaps run rough because pulling the vacuum line off tells the computer to really richen up the mixture.

Posted on Nov 26, 2013

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I have a 1988 GMC 1500 with a 305 the problem is that it wont idle I found that if I pull the vacum line off the MAP sensor it is fine for 30 seconds then dies I got a new map sensor and nothing chan


Change the PCP valve and run the heater. This should take care of it. You only have to run the heater one time as this is controlled by the vacuum system. This will cause your motor to run proper.

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Nov 12, 2011 | 1996 Chrysler Town & Country

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Code reads that map sencor is bad i changed it and the van still misses badly


although your scanner detected a faulty map sensor is not a fact that is bad, it may have a bad connection or a vacuum leak you may start by checking the connector for any cracks dirt or bended terminals any thing that keep it from making a good connection . vacuum leaks also play a big role in the malfunction of map sensor . check all your vacuum lines a image diagram is usually posted in the inner fender or under hood an easy way to look for vacuum leaks is by using a piece of hose. garden hose be will be ok. with engine run get the hose next to your ear and move it along the vacuum lines you will be able to hear the leak if is there.

Feb 22, 2011 | 2002 Chrysler Town & Country

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1993 Explorer 4 wheel drive. it acts like it's not getting any gas. it wont idle and it dies every time i try to drive it. Black stuff was coming out the tail pipe and it runs better when you remove the...


It sounds to me like you have a big vacum leak in the intake or injection port. You can spray starting flud or carb cleaner around everything while its running when it speeds up you found the leak. You must be un pluging the map sensor vacum.

Jan 17, 2011 | Ford Explorer Cars & Trucks

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On a 2004 trailblazer,where is the map sensor located? i checked it at local auto zone store,they said it was map sensor.


map sensors or manifold air pressure sensors are mounted either on the intake manifold or the throttle body. in some cases they are monted on the firewall with a vacume line running to them from the manifold. they have a three wire connector plugged into them.

Feb 16, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Engine is running like a plug wire is off -codes say map sensor, crk sensor, vacuum leak - did not shift into high quite right for two weeks leading up to this - plugs, wires ok - where is map sensor and...


these sensors are in you vacume lines. You can tell which ones because they are thin black hoses with mulitple extensions on them. You are looking for components with electrical wiring running form the hoses to the vehicles "brain".

Feb 03, 2010 | 2006 Isuzu i-280

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97 s-10 runs fine when it's cold but when hot it starts to back fire when i give gas


Could be anything, its one of those thigns that are hard to figure out sometimes. Could be a EGR valve not working properly, could be MAF or MAP sensor, failing O2 sensor(s) as well. or simply a vacume leak around the throttle body or at a vacume line.

start with the simple, look for broken or cracked vacume lines or obvious leaks.

What motor is in this s-10? 2.5 4 cyl? 2.8 V6?

im thinking if it was a fuel supply problem you would notice the issue at fast idle when cold as well.

also. how does it idle when it warms up?

Nov 18, 2009 | 1998 Chevrolet C1500

1 Answer

Ok my 1991 honda civic now starts but wont run very long unless you are giving it gas but you cannot put it in drive without the car cutting off everything under the hood is new and within the specs they...


It sounds like the map sencors may be your problem, Take a look at all the wire cuplers that are around the fuel injection area they may be soft set. You will need to gently but firmly squeeze them together, Because if they are soft set you will then here a clicking sound. Just so you know the map sencor controls your fuel going to the injection system.

Jun 28, 2009 | 1991 Honda Civic

1 Answer

I HAVE A 1991 CHEVY PICKUP. I HAVE BOUGHT A NEW IDLE SENSOR. MAP SENSOR, AND THROTTLE SENSOR. WHEN I PUT THE MAP SENSOR ON THE TRUCK DIES.


the idle sencor hASSS TO BE RUN FOR A WHILE,ALSO YOU WILL HAVE TO RESET YOUR COMPUTOR BY DISCONECTING THE GROUND CABLE TO THE BATTERY

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