Question about 1995 Jeep Wrangler

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Excessive fuel consumption, backfire on decelleration, and rough idle

I have put a new exhaust system in, put a new exhaust manifold gasket in, o2 sensor in, and made sure i dont have any exhaust leaks. i cant get over 72 mph on the highway. haynes manual doesnt help narrow down problems. anyone got any advice??

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Check your pre-cat or even main cat-converter

Posted on Nov 27, 2011

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Put a vacuum guage on the intake I hope its an automatic one foot on the brake and one on the gas in drive slowly accelarate if the vacuum falls to or near O as you accelerate you have a restricted exhaust,
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Posted on Aug 18, 2008

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Service engine soon light is on showed p0160 replaced an checked for bad wiring to the mas air sensor still rough idle in gear n now want to shake when it shifts into overdrive it shakes

MOST LIKELY A BAD O2 SENSOR...Potential causes of an P0160 code include: Holes in exhaust near post cat o2 sensor Bad Bank 2, position 2, o2 sensor Wiring problem, melted harness, broken connectors, etc. Bad PCM

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Signs of a bad valve cover gasket

My first question would be, what was the original trouble code that directed the mechanic to replace the sensors ? You seldom need more than one O2 sensor at a time. Its possible the exhaust manifold is leaking and that might cause a problem that would turn on the warning light. Or it could be something else.
A valve cover gasket will leak oil if it fails. No check engine light.

May 15, 2013 | 2000 Jeep Grand Cherokee Limited

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99 kia sportage, backfiring, no power, rough idle.

yes it is a blown head gasket also probally a broken valve these engines do not like heat do your self a favor and stop driving it your doing more damage to it everytime you start it

Apr 22, 2013 | Kia Sportage Cars & Trucks

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Why does mymy 97 hondapassport heasatate taking fuel

First thing that comes to mind is the O2 sensor, but if you don't have an engine light on, that may not be the case. Check all hoses and connections for vacuum leaks, and check that your exhaust manifold gasket isn't leaking, especially the gasket between the manifold and the down pipe. It could be sucking air and throwing your O2 readings off and screwing everything else up. Not sure if you can reply to me anymore, since they screwed this site up, but email if you need more help.

Feb 05, 2013 | Cars & Trucks

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Hi I'm new to this site , I have been asked to close Q I have asked already but don't know how on my iPhone to close then please help

There are two kinds of backfires, one is produced from the engine air intake and the other is produced from the tail pipe of the exhaust system. The cause for a backfire condition can vary depending on the malfunction of a particular system. Some backfires can be extreme enough to cause damage to related components. Anytime a backfire is observed immediately diagnose and repair as needed. If the engine is running rough it can produce a backfire. A backfire occurs when there is an imbalance in the air to fuel ratio required for your vehicle to operate properly. If the fuel mixture is too lean (not enough fuel) you may have a backfire in the intake manifold gasket, or too rich (too much fuel) you may get a backfire out of the exhaust system. It is important to observe the location of the backfire.

Oct 10, 2012 | Cars & Trucks

1 Answer

Mazda 6 , 2.3 engine, 2003 model, have a rough idle. Clean the MAF sensor an de the trhttle body intake, reste the computer. The engine betters the idle but in some times it goes back to rough idle....what...

Sometimes if the throttle has been dirty for a while the engine will have been running rich due to lack of air intake. When this happens the O2 sensor on the exhaust manifold gets covered in soot and as a result is no longer able to measure oxygen levels in the exhaust accurately. If the O2 sensor sends a low voltage signal to the ECU (high level of oxygen in exhaust) the ECU tries to compensate by increasing injection times and this further enriches the intake mix. The end result is a lumpy idle and heavy fuel consumption. You may not yet have a check engine light but it might be a good idea to have your diagnostics scanned for any stored error codes. Failing that remove the O2 sensor and check it's condition if it's black with soot then you will know what is now causing it. Either change it or, since you have nothing to lose, use a plumbers burner to heat the O2 tip to red hot to burn off residues. Hope this gives you some avenues to think about.

Sep 15, 2011 | 2003 Mazda Mazda6

2 Answers

I have a 2000 ford expedition 5.4L and I just replaced my intake manifold and am having a lean code in bank one. I've checked the MAF sensor and vacuum lines and there good. do you know what else could...

You had the intake manifold gaskets replaced ,causing
a vacuum leak & thus a lean condition ?

Have the front (2) O2 Sensors been replaced at 100,000 miles
They will be in the converter inlet or pipe before it

Bank 1 is the right or passenger side
If you do an O2 sensor do bothe side if you have daul exhaust

As you said you can not have any vacuum leaks in the ducting
buy the air filter,maf or anywhere

O2 Sensors also come loose from the heat & thus exhaust leaks
& codes
The sensors doesn't know where the air comes from & just reports
what goes past it

Aug 05, 2011 | 2000 Ford Expedition

1 Answer

I need to know which O2 sensors are which: Bank 1 Sensor 1, Bank 1 Sensor 2, Bank 2 Sensor 1, and Bank 2 Sensor 2. Which are on the engine block and which are on the exhaust?

bank one upstream oxygen sensor on exhaust manifold bank two oxygen sensor after catalytic converter.tell me what code you are 1 sensor 1 fuel system is too rich fuel pressure too high fuel pressure regulator leaking or more than 1 fuel injector leaking. fuel contaminated.check spark plugs if black carbon color fuel system too rich. if you getting code bank 1 sensor 2 check for air leaks in the exhaust system, air leaks intake manifold.look for vacuum lines leaks,look for vacuum leaks pcv valve and hose and make egr valve not stuck open or gasket leak.

Apr 15, 2011 | 2003 Mazda MPV

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