Tip & How-To about Pontiac GTO

Better gas milage

Want to get a little better performance and increase your gas milage. Remove your mass airflow sensor. Using a pair of needle noise pliers, pull the screen out to increase air flow along with using a high flow air filter or cold air intake system..K&N, Spectra, Varaum, etc. Install a high flow exhaust & Purchase a programmer if you can.

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How to replace gas cap


Step 1 - Determine Your Type of Gas Cap Before acquiring a new one, think about whether you need a gas cap that locks to prevent a gas thief from stealing your gas. But keep in mind, if you put one of these caps on your car, your spouse or children who put gas in your car will need the gas cap key.
Step 2 - Remove the Cap Retention Ring When you actually replace your gas cap, you may need to remove a retention ring that keeps the cap attached to your car. If you do, you can remove it simply by using a pair of needle-nose pliers. Just slip one tip of those pliers under the ring edge; then close the pliers and pull the ring off the old cap and slip it over the new cap.
Step 3 - Check the Warning Sensor Light Your car may have a sensor light that will illuminate when you change your cap. If so, drive your car a few miles to see if the light goes off. If it doesn't, see your repair mechanic to fix the problem

Aug 17, 2015 | 2002 GMC Envoy

1 Answer

truck running poorley,******* gas


have you replaced both the air & fuel filters ? important ! also, did you over look replacing the OXYGENsensor ? important ! when you replaced your TPS, you may have not realized with engine not running that the tps increased the idle. you can adjust the idle by mounting the TPS with engine running, loosen nuts, while holding tps, turn it a little to adjust RPM's, retighten nuts or bolts, once you feel its right. the rpm's that is. tight is tight, too tight is broke ! the EGRvalve is something to consider with these engines, they get clogged up, remove yours and clean it out, or replace it, it does matter. how old is your MAS SENSOR, mass airflow sensor ? this is a major player in the performance of your engine ! works together with oxygen sensor !

Feb 24, 2013 | GMC Sierra Cars & Trucks

2 Answers

I have a 2000 Nissian frontier 4x4. I have replaced both exhuast manifolds and it still sounds like I have an air leak under teh hood. Its sounds like sucking sound. I get terrible gas milage and it seems like i have a loss of power. what could be the problem?


Sounds like you may have a plugged catalytic converter. Find a shop that can check backpressure in the exhaust. They will have a tool that threads into the O2 sensor bung. They will use a vacuum/pressure gauge to see ho much back pressure there is in the exhaust. Anything more than a couple of PSI and there is a restriction.

Jan 22, 2013 | 2005 Nissan Frontier

1 Answer

My 1991 240DL volvo has a hard start, and while idling, goes up and down, then eventually stalls out. The air flow sensor/air mass meter? was unhooked, and the car idled smoothly. Is it true that the car is not supposed to start at all when the sensor is disconnecter?


When you unplug the mass airflow sensor, the car goes into "limp home" mode in which it runs full rich. Generally speaking, if a car runs better with the mass airflow sensor unplugged than with it plugged in, the mass airflow sensor has failed.
However, the drifting idle tends to make me want to look for vacuum leaks and check the rear temperature sensor on the driver side of the head. I suspect that running over-rich is compensating for the vacuum leak so the car keeps running.
If you have a propane torch or a can of diesel starting ether, spray it around the intake manifold while the car is idling and see if the engine speeds up. If so, then you have found a vacuum leak.
If it were mine, I would buy a new intake manifold gasket and replace it as a routine maintenance item. It is not expensive or difficult to replace except that if you are like me, you WILL drop at least one nut, and there are several great hiding places on that side of the engine where the nuts go to hide when you drop them. You will need a magnet to recover them. You don't need to pull the manifold clear off, you just have to pull it clear of the bolts so you can slip in a new gasket. You can leave the throttle cables and most of the other connections hooked up
If you know how to use an ohm meter, you might consider getting a manual for this car and looking up the appropriate resistance/temperature values and checking that rear temperature sensor.
While you are replacing that intake manifold gasket, check all the vacuum ports to make sure they are clear, and check all the vacuum hoses to make sure they are intact. Also check the tubes between the mass airflow sensor and the throttle body for cracks. While you have those air tubes off, clean the throttle body and the idle air control valve with some carb cleaner. Spray a little carb cleaner through the mass airflow sensor as well. Actually, there is a special spray for cleaning mass airflow sensors that is more gentle, but I have used carb cleaner on them many times with no apparent ill effects.
If it turns out that the mass airflow sensor has failed, that will run some $$, but having a fresh intake manifold gasket and clean throttle body and no vacuum leaks will be worth your time and money and make the car run better when you are done.

Jun 07, 2011 | Volvo 240 Cars & Trucks

2 Answers

is IS250 bad on gas?


Try installing a K & N Air filter. Any good Parts store Carries them. Changed the HP and Milaeage on my 425 HP Chevrolet Truck. Added 35 to 45 HP and increased My Mileage to 23 Per Gallon!

Jan 12, 2009 | 2007 Lexus IS 250

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