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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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2000 Chevy S10 2.2 code CO318 and P1870 Repaired problems with the Automatic trans codes.

as there are 2 oxygen sensors in an exhaust did you replace the correct faulty unit
The oxygen sensor ( HO2S -heated oxygen sensor ) is in the exhaust manifold before the cat converter and controls the air/fuel mixture
The other is a simple O2 sensor and is after the cat converter
2 different applications , 2 different jobs

Mar 23, 2018 | Cars & Trucks

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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.

Apr 18, 2017 | 2002 Nissan Sentra

2 Answers

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

I’m happy to help further over the phone at

Mar 18, 2014 | 2004 Chevrolet Impala

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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.

Jan 05, 2014 | 2012 Nissan Altima 2.5 Sedan 2.5L 4-cyl....

1 Answer

Glowing Converter/ Muffler Noise/ Power Loss

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

Apr 05, 2017 | 1994 Chevrolet Camaro

1 Answer

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.

Sep 03, 2012 | 1994 Chevrolet Suburban

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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.

Jun 28, 2011 | Dodge Caravan Cars & Trucks

1 Answer

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

Nov 14, 2009 | 1999 Pontiac Grand Am GT

2 Answers

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 ..

Sep 17, 2009 | 1997 Pontiac Sunfire

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2008 nissan altima a/c issues Last week the car stopped blowing cold air. After doing a pressure test, the low/high readings were both around 100. I assumed that the compressor wasn't kicking on. The compressor clutch had been working until this issue started but there was a noise that sounded like it was going bad. It had 100K miles on it so I replaced it. I also replaced the condensor (due to some damage on the front), the drier, and expansion valve. The only original component that showed a leak when I checked with my UV light was the drier....right at the based of the LP switch. After getting everything buttoned up i pulled vacuum on it for an hour and it held at 29". I then closed the valve and turned the pump off and let it sit for another hour. It was still holding at 29". I hooked up the freon to my manifold gauge and turned the car on with the a/c going. I charged the system until the low/high pressure was 37/190. The air was blowing colder about about 55 degrees. I thought it would be colder but it was an improvement. Once complete and everything disconnected, I turned the car off and went inside. I came back out a few minutes later and cranked the car....compressor wouldn't come on and warm air resumed. I ended up evacuating the system again and repeated the vacuum/recharge process again....cold air around 55 degrees. I reached over and turned the MAX A/C button on, the compressor went off and the warm air was back. I do not know if these two things are related but I also noticed that the condensor/radiator fans are not running at all. Could this be a sensor? Any help would be appreciated. I know enough about this stuff to be dangerous so if you give some tips, please simplify the best you can. Sometimes people give advice they forget that the little details stump us novices at times. ha. Thanks

Jul 18, 2018 | Nissan Cars & Trucks

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