Question about 1991 Ford Thunderbird

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Coupe misses at all rpm some days and not others

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Give it a complete tuneup including all the plug wires.

Posted on Nov 15, 2010

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Posted on Jan 02, 2017

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1 Answer

Would a code 720 cause the following problem?


No the speed sensor will not cause misfires at higher speeds and this sensor is located on transmission case up high and towards the tail shaft Not in the tail shaft that one is the vehicle speed sensor and it sets a po500 code.

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I have a 2002 sebring coupe with a 3.0 v6 mitsubishi engine in it. its acting quite funny for the past 4 days. it vibrates or shakes (sort of the same vibration you get from a misfire) only wen i am...


Based on the info you gave, I would say the engine is experiencing a miss-fire. At some point it should be bad enough to set a code for the cylinder or random missfire.
I would check the plugs and the ignition system first. The engine is working hard when it goes into overdrive at a low speed. Any minor problem will show up then.
The O2 code could be important too, if the fuel system is running lean. It takes more gas when the engine is pulling hard.

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I have a 1999 chrysler sebring coupe with a 2.5 v6 engine.My problem is the car idles rough and misses at low rpm.But it runs good on the road no problems. When i let off the gas like going down a hill or...


first of all, a 2.5 is a 4 cyl.. I noticed you stated it was a 6 cylinder, 6 cyl. are 3.0. it is important to know if it is a 4 or 6 cyl to correct this type of problem. this problem is either carburetor related or something the fuel line. try losening the gas cap and the drive to see if this corrects problem. could be vapor locked......mike

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Rpm unstable


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My check engine light on my 07 saturn ion keeps coming on and gives the code p1174 and p0300 what do they mean and how do i fix


1174 is a lean code, and would have to been set first because it will not set when the 0300 is there. 0300 is a random misfire, because it read after the lean code, it was probably caused by the lean condition. 1st check for vacuum leaks from hoses or intake gaskets, you cal listen for a hissing sound, or spray carb cleaner around intake systems, a change in rpm will be noticed when spraying near a vac leak. other probable causes are the upstream 02 sensor, map sensor, or fuel delivery problems. does the vehicle idle porly, or does it miss at the top end?

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misfires are also from low fuel pressure and bad injectors
run a can of quality injector through the system to see if that improves the problem

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