Question about 1999 Kia Sportage

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Missing poor performance - 1999 Kia Sportage

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Since I have no idea as to the mileage on your vehicle I can only suggest changing the spark plugs, fuel filter and air filter. Also put a bottle of Techron fuel system cleaner in the gas tank and drive it.

Posted on Sep 23, 2009

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Suzuki Grand Vitara 2.5 L poor engine performance, very flat. Good idle, not missing. Could the timing chain be the cause. No codes when scanned.


I would suggest a compression test as an engine with those miles on it will be close to being badly worn
If thee is a chain problem it will not be running

Mar 18, 2015 | 2002 Suzuki Vitara

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What needs to be checked when my truck has poor acceleration going up a hill? Why does it have no power and then have surges of power


depending on the model of truck , it could be the throttle body that causes poor acceleration ,could be the fuel filter if the engine starves for fuel it will affect the performance , yo should check fuel pressure and volume on the fuel system ,it could also be the eger vavle most newer trucks and cars have linear eager vavles and if the stick a little open on idle they can cause surging ,poor acceleration even missing . if the check engine light is on find out the codes and go from there . on older models it could be the TPS or the IAC v, but i would need to know what codes are in it first . It could be as simple as bad fuel .or a vacuum leak

Oct 17, 2014 | 2001 Dodge Ram 1500 Truck 2WD

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Bad crank sensor symptoms


the engine will not start. general missing and poor performance

Aug 12, 2014 | Cars & Trucks

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Bottom of intake has a hole in the bottom of it , would that make it pop in the carb ?


You don't say what year, make, or model of vehicle you are asking about. This makes answering difficult. BUT, there should NEVER be a hole in the bottom of an intake. This will cause a reduction in engine vacuum,. introduce dirt and grit into the engine, and cause poor fuel economy and poor engine performance. Get the intake problem fixed and you are well on your way to a better performing vehicle.

Dec 10, 2011 | Dodge D150 Cars & Trucks

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Cortinaengine wont stay runnining missing the breather flex tube


When you say the breather flex tube is missing, I just want to make certain we're discussing the same thing; do you mean the tube that goes from around the exhaust manifold to the air filter intake?
If that's what we're discussing, it's an important part of the ice prevention for the carburetor or throttle body. As the air is drawn past the butterfly valve, the air temperature drops significantly. That's also where the fuel is vaporized, also dropping the temperature.
If the air is humid and already cool as the temperature drops, frost will build up, eventually decreasing the air flow, resulting in poor performance and eventually, when there is enough ice, the engine will die.

Jan 30, 2011 | 1995 Chevrolet Caprice

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Bad miss and poor performance. timing marks are all on and 2 of the spark plugs were fouled. changed them and didn't help performance. compressions checked in at 145psi so I am thinking the coil packs are...


compression was 145psi on the cylinders with the fouled plugs? If so I would have to agree that there is something wrong with spark. Check the plug wires for leakage. One trick to doing that is to start your car at night or in a dark garage and look to see if you can see any spark emitting from the wires. Also check the spark plug boot for imperfections.

Oct 21, 2010 | 1992 Nissan 300ZX

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I have been told that I need to change the struts and shocks. No visible sign of leaking. Alignment seems fine and drives smooth. Am I missing something?


Parts on cars do not last forever and replacing struts and shocks usually are recommended about every 80,000 miles.They have the job of keeping the tires in contact with the road,and bad shocks can be a safety issue like poor braking performance.

Oct 02, 2010 | 2005 Subaru Outback

1 Answer

1994 jimmy 4.3 vortec has a stumble right off of idle when accelerating and a hesitation once and awhile at random spaads ussually under load any suggestions?


Do you have an O2 sensor code that would explain a random miss?
Does it happen cold or hot? Have you checked the spark from the coil?

Diagnosis Before beginning any diagnosis and testing procedures, visually inspect the components of the ignition system and engine control systems. Check for the following:
  • Discharged battery
  • Damaged or loose connections
  • Damaged electrical insulation
  • Poor coil and spark plug connections
  • Ignition module connections
  • Blown fuses
  • Damaged vacuum hoses
  • Damaged spark plugs
Check the spark plug wires and boots for signs of poor insulation that could cause crossfiring. Make sure the battery is fully charged and that all accessories are off during diagnosis and testing. Make sure the idle speed is within specification. If an open or ground in the Ignition Control (IC) circuit occurs during engine operation, then engine will continue to run, but using a back-up timing mode (controlled by the ICM) based on preset timing values. The Malfunction Indicator Lamp (MIL) or SERVICE ENGINE SOON light will not illuminate at the first appearance of a break in the circuit. However, if the IC fault is still present once the engine is restarted, a Code 42 will set on OBD 1 systems in the PCM and the MIL will illuminate. Poor performance and fuel economy may be noticed while the engine is running under back-up timing. When attempting to search for ignition troubles, keep in mind the various sensor inputs which the PCM uses to calculate timing may affect engine performance. The PCM will alter timing based on sensor inputs as follows:
  • Low MAP output voltage = More spark advance
  • Cold engine = More spark advance
  • High MAP output voltage = Less spark advance
  • Hot engine = Less spark advance
With this in mind, DETONATION could be caused by low MAP output or high resistance in the coolant sensor circuit. POOR PERFORMANCE could be caused by a high MAP output or low resistance in the coolant sensor circuit.

Jul 22, 2010 | 1994 GMC Jimmy

2 Answers

I filled up my 2002 Mazda MPV yesterday at Walmart, Manning


Could be bad gas, water in the gas? Run the tank down to about 1/4 and put gas from somewhere else in it. Maybe higher octane for one tank full. Maybe put an additive in with it. If it clears up, then it was the gas.

Mar 13, 2010 | 2002 Mazda MPV

2 Answers

#1 Misses Intermittently. Engine Light On.


Check for carbon tracking on plug and wire. Looks like a pencil mark. Replace both at the same time

Apr 27, 2009 | 1997 Oldsmobile Regency

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