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99 malibu popping sound

Manifold gets hot fast. No DCT codes. All cyl have good pressure. Checked Cat.converter. Replaced MAP. Trans jerks putting in drive.

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Didnt specify much but bad damaged valves --skipped timing chain -clogged cat converter can cause overheated manifold [s ] but are not only reason need to do compression test , timing and exhaust pressure

Posted on May 01, 2017

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Posted on Jan 02, 2017

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My 02 sentra will not go into drive


Hello 02 Sentra....Have you checked the transmission fluid level?

Is your dash board displaying any SES (Service Engine Soon) indicators?

Your vehicles on board systems can be accessed by a
OBD II reader...I do believe AutoZone performs this as a free customer service.

PS: MAP - Manifold Absolute Pressure - The MAP sensor converts engine vacuum/manifold pressure to an electrical signal so the computer knows how much load the engine is under. This data is the basis for fuel delivery and timing control. The MAP sensor is typically located in the air cleaner, fender wall, firewall, intake manifold or under the dash.

What are the symptoms of a faulty map sensor?
Vehicles with a bad manifold absolute pressure (MAP) sensor typically run rough while accelerating, decelerating or idling. Other common symptoms include increased fuel consumption and sudden jerks or hesitation while accelerating. Drivers may detect a strong smell of gas after the engine has warmed up.

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Check engine light on; cat codes read from machine?


Good morning! for the most part O2 sensors are contaminated due to an incorrect fuel/air mixture...They are an effect rather than a cause...symptoms of jerking up hill and not very fast would indicate a defective Throttle Positioning Sensor (TPS) or Manifold Absolute Pressure (MAP) sensor...Here is least expensive fix...Buy a can of DeOxit from radio shack...Remove and spray O2 sensors...This is a NO-Touch cleaner...Reinstall...Using a voltmeter set to read 5 volts...TPS is bolted to the throttle body and has following colored wires...Black, Gray and Dark Blue...with connector in place push two safety pins into the rear of connector on Dark Blue plus lead and Black negative lead...Start engine...At idle meter must read .08 volts...Bump idle to full... Meter must read 4.2 volts...If reading never gets higher than 2 volts...TPS is the problem...see image


746d99a2-b003-45c3-8349-11fa4f7ef804.jpgCost $35.00

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2005 Nissan Altima code P0420


code p0420 refers to the cat converter system-bank 1--efficiency below threshold===causes --wiring--cat converter -- HO2S 2. I would replace the heated oxygen sensor number 2. There is no real life on cat converters as they are extremely fragile and run at extreme temperatures which means that if you hit a icy puddle of water / snow and the cat is hot they are prone to cracking and disintergrating internally and blocking up the exhaust pipe.. In your case I would be looking at the sensor. Use the correct tool so that the wires are no damaged.

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three things to check-idle air control valve if you haven't checked already-a crack or leak in the intake manifold-or clogged ports in your intake manifold

Mar 24, 2013 | Cars & Trucks

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Glowing Converter/ Muffler Noise/ Power Loss


your cat is plugged remove it and replace with straight pipe or replace cat

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I have a 1994 k2500 suburban with very little tow power.I've done a complete tune up, replaced the fuel filter,Had the trans checked, replaced egr,cat and muffler,good fuel pressure,compression 14


Have you tried to manually downshift the trans going up hills? Sounds like the trans is not being told to downshift .

There is a test machine, (Want to say Odessey) that is attached to your truck and the truck is driven while hooked up. This machine can be asked questions by the mechanic. It has more electronics in it than the onboard computer. You would have the trailer attached to reveal realtime operating conditions.

It basically can do what a Dynamometer can do, while pulling a load. Even if it cost substantially to do this test, you would save by not buying parts you do not need.

Find a Dealer who knows about this type of machine and has one to use on your truck.

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I have a 2000 Dodge Caravan we bought in March. When we purchased it, it was getting 20-22 MPG. Now, in June, we are down to 13MPG! We live in Charlotte, NC and its currently in the 100 degree range...


Check the cat converter for blockage and check for vacuum leaks. The line from the EGR valve to the manifold has been known to leak on these vehicles. A good diagnostic scan to determine fuel trim mixtures would be helpful also.

Good luck, i hope this helps.

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If i get a check engine light on and i go to get it checked out, and the code given to me says something is wrong with my catalytic converter, can that also mean something is wrong with the manifold, Or...


Manifold is good, cat is bad. Expect about 80K out of a cat before it expires and needs to be replaced. Nothing can go wrong with the exhaust manifold

Oct 13, 2010 | 2001 Mitsubishi Galant

1 Answer

My 99 grand am is idling fast and slipping?


i think you have an air leak with this new gasket you fitted that would make the engine run faster as its running very week and drwing secondery air , witch is why you have low presher,, the thumping you get when you put the car in gear is becouse its ticking over too fast it could brake a drive shaft if you dont sort the manyfold gasket out soon, check all the bolts around the intake are tight first, but my gess is its leaking badly

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Running rich and p0300 and 108


p0300 tells you the engine is missing .. the p0108 is the MAP sensor circuit .. MAP is "Manifold Absolute Pressure" or in simple terms it measures the vacuum in the intake manifold .. you could have a broken vacuum hose, bad power brake assist diaphram or other vacuum leak .. or you could just have a bad MAP sensor .. other less likely causes can be a timing belt slipped a cog ... listen for the hissing caused by a vacuum leak .. you can test the MAP sensor .. it should put out less than 2 volts idle and over 4 volts key on but engine not running (same for wide open throttle) .. if there is a vacuum leak then it will read high at idle .. if the sensor is bad the voltage may not change ..

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