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,
If this information is helpful to you please give me a fixya! Rating

If I can help in any way please let me know Thanks
Randy

www.aceautomotive1.com
fixincars@yahoo.com

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

Apr 16, 2015 | 1996 Chevrolet Suburban

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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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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

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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

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What are engine diagnostic codes P0170 & P0173 & what is the repair?






1.
P0173 O2 Sensor System - Lambda Controller at the Limit (Bank 2 P0170 O2 Sensor System - Lambda Controller at the Limit (Bank 1 Visually/physically inspect for air leakage in intake/exhaust system as following items. A. Vacuum hoses for splits, kinks and improper connections. B. Throttle body gasket. C. Gasket between intake manifold and cylinder head. D. Seals between intake manifold and fuel injectors. E. Exhaust system between HO2S and Three way catalyst for air leakage. 2. Visually/physically inspect the restriction in intake/exhaust system as following items. A. Air cleaner filter element for excessive dirt or for any foreign objects. B. Throttle body inlet for damage or for any foreign objects. C. Throttle bore, throttle plate and the IAC passages for chocking and for any foreign objects. D. Restricted exhaust system.

Feb 12, 2011 | 2005 Hyundai Sonata

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Engine backfire on decelleration Timing Checked


if is doing it thru the carb then the fuel mixture is too lean, if is in the exhaust (also called after-fire) the fuel mixture too rich.

Sep 04, 2010 | 1966 Ford Mustang

1 Answer

Where are the exhaust system bolts located?


Removal & Installation 2.2L Engine To Remove:
  1. Remove or disconnect the following:
    • Negative battery cable.
    • Heat shield.
    • Oxygen sensor.
  2. Raise and safely support the vehicle.
  3. Remove exhaust pipe from the exhaust manifold.
  4. Lower the vehicle.
  5. Remove the exhaust manifold mounting nuts from the cylinder head. chevy_cav_02-04_exmanifold.gif

  6. Remove the exhaust manifold.
  7. Clean the mating surfaces.
  8. Check for cracks, broken flanges and gasket surface damage.
  9. Use a straight edge and a feeler gauge. If the flanges or the mating surfaces do not align, the manifold is warped and should be replaced.
To Install:
NOTE: The manufacturer recommends using new exhaust system nuts.
  1. Install the manifold gasket.
  2. Position the exhaust manifold to the cylinder head. Exhaust manifold 2.2L 87953055.gif

  3. Install the new exhaust manifold nuts. Tighten the nuts starting from the center and working toward the ends to 110 in lbs (12.5 Nm).
  4. Raise and safely support the vehicle.
  5. Install the exhaust pipe to the manifold using a new flex coupler gasket.
  6. Install new exhaust flange mounting nuts.
    • Tighten to 33 ft lbs (45 Nm).
  7. Lower the vehicle.
  8. Install the oxygen sensor.
  9. Install the heat shield.
  10. Connect the negative battery cable.
2.4L Engine To Remove:
  1. Disconnect the negative battery cable
  2. Disconnect the Oxygen (O2) sensor electrical connector.
  3. Remove the (O2) sensor.
  4. Raise and safely support the vehicle. Exhaust brace 2.4L 87953053.gif

  5. Remove the exhaust manifold brace-to-manifold bolt and the oil pan nuts, if necessary. Exhaust heat shield 2.4L 87953051.gif

  6. Remove the upper heat shield. NOTE: Do NOT bend the exhaust flex decoupler more than necessary to remove it. Excessive movement will damage the flex decoupler
    Exhaust flex decoupler 87953056.gif

  7. Remove the manifold-to-exhaust flex decoupler fasteners.
  8. Remove the exhaust pipe.
  9. Carefully lower the vehicle.
  10. Remove the exhaust manifold-to-cylinder head mounting nuts/bolts. Remove the exhaust manifold.
  11. Discard the gaskets and/or seals. Clean the mating surfaces.
To Install:
Exhaust manifold 2.4L 87953055.gif

  1. Install new exhaust manifold gaskets. Position the exhaust manifold on the cylinder head. Tighten the mounting bolts in sequence to 110 in lbs (12.5 Nm).
  2. Raise and safely support the vehicle.
  3. Install the exhaust manifold heat shield. Tighten the mounting bolts to 10 ft. lbs (14 Nm).
  4. Install the exhaust manifold brace-to-manifold bolt and the oil pan nuts. Tighten the mounting bolts to 41 ft lbs (56 Nm) and the nuts to 18 ft lbs (24 Nm).
  5. Position the exhaust pipe to the manifold. Install the manifold-to-flex decoupler mounting bolts. Tighten to 26 ft lbs (35 Nm).
  6. Lower the vehicle.
  7. Coat the threads with a suitable anti-seize compound and install the O2 sensor.
  8. Connect the O2 sensor electrical connector.
  9. Connect the battery ground cable and check for leaks.
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Sep 02, 2010 | 2000 Oldsmobile Alero

3 Answers

Volvo 850 smoke coming from exhaust manifold


Not to worry. Run the engine up to operating temp before jumping to conclusions and let the heat burn off any excess oil. A leaf will not do any damage.Do not let the engine overheat while idling and if the oil light comes on switch off immediately.
The smoke from the exhaust is oil deposited by oily assembly hands just burning off. It should dissipate after about 15 minutes at most.(or 5 miles' drive)

Jun 07, 2010 | 1994 Volvo 850

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